Water diversion system for pumped storage power station with ultrahigh rated water head

Abstract

The utility model discloses a water diversion system for a pumped storage power station with an ultrahigh rated water head. The water diversion system comprises an upstream straight section, N stages of vertical shafts and N stages of branch-shaped forked sections, preferably, the N-stage vertical shaft is a 2-3-stage vertical shaft. One end of the upstream straight section is connected with the upstream reservoir, and the other end is connected with the top end of the N-stage vertical shaft; the lower end of each stage of vertical shaft is provided with a corresponding straight section, and is connected with the lower stage of vertical shaft through the straight section; each stage of bifurcation section is arranged on the straight section at the lower end of the vertical shaft of the corresponding stage, and each stage of bifurcation section is a sub-bifurcation section of the upper stage of bifurcation section; each stage of bifurcated section sequentially passes through the straight section where the bifurcated section is located and the vertical shaft of the next stage, and water flow is guided to the lower-stage bifurcated section; and in the N stages of bifurcated sections, one end of the last-stage bifurcated section is connected with the previous-stage bifurcated section, and the other end of the last-stage bifurcated section is connected with the water-turbine generator set. According to the utility model, the bifurcation section is arranged on the straight section under each stage of vertical shaft, so that the arrangement of one hole and multiple machines of the water diversion system of the ultrahigh rated water head pumped storage power station is realized, the project investment is saved, meanwhile, the HD values at the N stages of bifurcation sections can be ensured to be within the range recommended by specifications, and the production and processing capabilities and hydraulic conditions of the existing equipment are better.

Description

Technical Field

[0001] This utility model belongs to the field of pumped storage power station engineering technology, specifically relating to a method for arranging the water intake system of an ultra-high rated head pumped storage power station. Background Technology

[0002] Pumped-storage hydroelectric power stations are an important energy facility that stores energy by pumping water between reservoirs, releasing the energy to generate electricity when needed, thus helping to regulate the supply and demand balance of the power grid. With increasing energy demand and technological advancements, pumped-storage hydroelectric power stations are developing towards higher rated head and larger capacity.

[0003] Existing pumped-storage power stations typically employ a "one tunnel, four generators" layout for their water intake systems: a primary steel branch pipe and a secondary steel branch pipe are installed in the lower horizontal section of the power station, with the end of the secondary branch pipe connected to the generators. Water first flows through a main pipe, then into the primary steel branch pipe for initial diversion. Subsequently, the water flow is split into two streams, each entering one of two branch pipes. These two branch pipes then connect to the secondary steel branch pipes for secondary diversion, ultimately distributing the water flow into four branch pipes, each responsible for supplying water to one generator unit.

[0004] For pumped storage power stations with ultra-high rated head, if the primary steel branch pipe is still located in the lower horizontal section, its HD value (an indicator that measures the impact force of water flow and the strength of the pipe) will far exceed the industry standard's recommended value of 4500 mm. This will not only increase the structural design difficulty of the steel branch pipe, making it difficult to meet stress requirements, but will also lead to a significant increase in the wall thickness of the steel branch pipe. Summary of the Invention

[0005] To address the aforementioned problems, this utility model discloses a water intake system for an ultra-high rated head pumped storage power station.

[0006] This utility model discloses a water intake system for an ultra-high rated head pumped storage power station, comprising: an upstream straight section, an N-stage vertical shaft, and an N-stage bifurcation section in a tree-like shape;

[0007] One end of the upstream straight section is connected to the upstream reservoir, and the other end is connected to the top of the N-level vertical shaft;

[0008] Each level of shaft has a corresponding straight section at its lower end, which connects it to the next level of shaft.

[0009] Each bifurcation segment is set on the straight section at the lower end of the corresponding level shaft, and each bifurcation segment is a sub-bifurcation segment of the upper level bifurcation segment; each bifurcation segment passes through its own straight section and the next level shaft in sequence, leading the water flow to its lower level bifurcation segment;

[0010] In the N-level bifurcation segment, one end of the last bifurcation segment is connected to the upper-level bifurcation segment, and the other end is connected to the generator.

[0011] Preferably, each bifurcation segment includes at least one bifurcation node and multiple bifurcation branches connected to the bifurcation node.

[0012] Preferably, each bifurcation node is located on the corresponding straight section;

[0013] Correspondingly, each branching section contains branching paths that connect to the next level of shaft or to the hydro-generator unit.

[0014] Preferably, the bifurcation node is a steel bifurcation pipe.

[0015] Preferably, when the bifurcation node is a steel bifurcation pipe, the steel bifurcation pipe is an internally reinforced crescent-rib steel bifurcation pipe.

[0016] Preferably, when the bifurcation node is a steel branch pipe, the steel branch pipe is a symmetrical steel branch pipe.

[0017] The HD value of the steel branch pipe is less than or equal to 4500 m·m.

[0018] The rated head of the pumped storage power station's water intake system is greater than or equal to 650m.

[0019] Preferably, the N-level shaft is a 2-3 level shaft.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention arranges the first-level steel branch pipe in the middle horizontal section, which can significantly reduce the HD value (i.e., the product of water head and diameter) of each level of steel branch pipe. This helps to reduce the processing and manufacturing difficulty of steel branch pipe and improve production efficiency and quality.

[0022] (2) By setting bifurcation sections in the straight section under each vertical shaft, this utility model optimizes the water flow path and reduces unnecessary energy loss, thereby improving the overall efficiency of the pumped storage power station. Furthermore, the dispersed arrangement of bifurcation sections allows the system to respond more flexibly to different water flow demands and load changes, which helps the pumped storage power station better adapt to the needs of grid dispatch and energy market, and improve its operational stability and reliability.

[0023] (3) Compared with the traditional 1-tunnel-1-machine, 1-tunnel-2-machine, and 1-tunnel-3-machine layouts, this utility model, by adopting a tree-like bifurcated section design, can significantly reduce the excavation volume of the water diversion system. This not only reduces project investment but also helps protect the natural environment and reduce the impact of construction on the surrounding environment;

[0024] (4) The branching segment design of this utility model allows water flow to be more flexibly distributed to different generators, which helps to optimize the utilization of water resources and improve the operating efficiency and stability of the power station. Attached Figure Description

[0025] Figure 1 This is an isometric view of the layout of the ultra-high rated head water intake system of the present invention;

[0026] Figure 2 It is a first-class steel branch pipe;

[0027] Figure 3 It is a secondary steel branch pipe;

[0028] In the diagram: 1. Upper horizontal section main pipe; 2. Upper vertical shaft main pipe; 3. Middle horizontal section main pipe; 4. Primary steel branch pipe; 5. Lower vertical shaft branch pipe; 6. Lower horizontal section branch pipe; 7. Secondary steel branch pipe; 8. Branch pipe. Detailed Implementation

[0029] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0030] like Figure 1 As shown, this utility model discloses a water intake system for an ultra-high rated head pumped storage power station, comprising: an upstream straight section, N-stage vertical shafts, and an N-stage branching section in a dendritic shape; preferably, the N-stage vertical shafts are 2-3 stages. Preferably, the rated head of the pumped storage power station water intake system is greater than or equal to 650m. The rated head of the pumped storage power station water intake system being greater than or equal to 650m demonstrates the superior performance of the system under high head conditions. It can meet the needs of large hydropower stations for high head and large-capacity power generation, improving energy utilization efficiency and economic benefits.

[0031] One end of the upstream straight section is connected to the upstream reservoir, and the other end is connected to the top of the N-level vertical shaft;

[0032] like Figure 1 As shown, the upstream straight section is laid with the upper horizontal main pipe 1, which is connected to the upper vertical shaft main pipe 2 (the pipe laid in the uppermost vertical shaft). Both the upper horizontal main pipe 1 and the upper vertical shaft main pipe 2 have only one water flow channel. The water flow in the upper vertical shaft main pipe 2 is divided into multiple branches level by level in the N-level bifurcation section.

[0033] Each level of shaft has a corresponding straight section at its lower end, which connects to the next level shaft. Specifically, each straight section has a pipe that connects to the next level shaft.

[0034] Each bifurcation segment is set on the straight section at the lower end of the corresponding level shaft, and each bifurcation segment is a sub-bifurcation segment of the upper level bifurcation segment; each bifurcation segment passes through its own straight section and the next level shaft in sequence, leading the water flow to its lower level bifurcation segment;

[0035] This invention effectively guides and distributes water flow under high head conditions through a combination of an upstream straight section, N-stage vertical shafts, and a tree-like N-stage branching section. This not only improves water flow utilization efficiency but also ensures that the water flow is smoothly and efficiently guided to the generator, thereby enhancing the overall power generation efficiency of the pumped storage power station.

[0036] Preferably, each bifurcation segment includes at least one bifurcation node and multiple bifurcation branches connected to the bifurcation node. The inclusion of at least one bifurcation node and multiple bifurcation branches in each bifurcation segment enhances the flexibility and adaptability of the water diversion system. It can adjust the water flow distribution according to actual needs, meet different power generation demands, and improve the system's operating efficiency and stability.

[0037] Preferably, the bifurcation node is a steel branch pipe. Using steel branch pipes as bifurcation nodes provides these components with excellent water flow distribution capacity and pressure-bearing performance. They can withstand the impact of water flow under high head conditions, ensuring the stable operation of the water diversion system.

[0038] Preferably, when the bifurcation node is a steel bifurcation pipe, the steel bifurcation pipe is an internally reinforced crescent-rib steel bifurcation pipe.

[0039] Preferably, when the bifurcation node is a steel branch pipe, the steel branch pipe is a symmetrical steel branch pipe.

[0040] The symmetrical steel branch pipe design helps to balance the distribution of water flow in the pipeline, reducing scouring and wear. This extends the service life of the pipeline and reduces the system's operating costs.

[0041] The HD value of the steel branch pipe is less than or equal to 4500 mm. This ensures the pressure-bearing capacity and stability of the steel branch pipe under high water head conditions. It helps prevent pipe rupture and water leakage, improving the safety and reliability of the system.

[0042] Preferably, each bifurcation node is located on the corresponding straight section;

[0043] Correspondingly, each branching section contains branching paths that connect to the next level of shaft or to the hydro-generator unit.

[0044] By placing bifurcation nodes on corresponding straight sections, and having each bifurcation segment's branches connect to the next-level shaft or to the turbine generator unit, this layout optimizes the water flow path and reduces water loss and energy consumption. Simultaneously, it helps maintain the system's structural stability and safety.

[0045] In the N-level bifurcation segment, one end of the last bifurcation segment is connected to the upper-level bifurcation segment, and the other end is connected to the generator.

[0046] exist Figure 1 The illustrated embodiment includes two levels of vertical shafts. For ease of description, the straight section between the two levels of vertical shafts is referred to as the middle section. A main pipe 3 is installed on the middle section. The main pipe 2 of the upper vertical shaft is connected to the main pipe 3 of the middle section. The branching node at the end of the main pipe 3 of the middle section is a primary steel branch pipe 4, as shown below. Figure 2 As shown, the primary steel branch pipe 4 is a tee pipe, one end of which is connected to the main pipe 3 of the middle horizontal section, and the other end splits into two branch lines. These two branch lines form the lower vertical shaft branch pipe 5, which is installed inside the next-level vertical shaft. The lower vertical shaft branch pipe 5 passes through the next-level vertical shaft to reach the lower horizontal section, where it connects with the lower horizontal section branch pipe 6 laid on the lower horizontal section. The end of the lower horizontal section branch pipe 6 is equipped with a secondary steel branch pipe 7 (such as...). Figure 3 As shown) and branch pipe 8 (i.e., the next level of bifurcation node and bifurcation branch), one end of branch pipe 8 is connected to the lower horizontal section branch pipe 6 through the secondary steel branch pipe 7, and the other end is connected to the generator.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) The present invention arranges the first-level steel branch pipe in the middle horizontal section, which can significantly reduce the HD value (i.e., the product of water head and diameter) of each level of steel branch pipe. This helps to reduce the processing and manufacturing difficulty of steel branch pipe and improve production efficiency and quality.

[0049] (2) By setting bifurcation sections in the straight section under each vertical shaft, this utility model optimizes the water flow path and reduces unnecessary energy loss, thereby improving the overall efficiency of the pumped storage power station. Furthermore, the dispersed arrangement of bifurcation sections allows the system to respond more flexibly to different water flow demands and load changes, which helps the pumped storage power station better adapt to the needs of grid dispatch and energy market, and improve its operational stability and reliability.

[0050] (3) Compared with the traditional 1-tunnel-1-machine, 1-tunnel-2-machine, and 1-tunnel-3-machine layouts, this utility model, by adopting a tree-like bifurcated section design, can significantly reduce the excavation volume of the water diversion system. This not only reduces project investment but also helps protect the natural environment and reduce the impact of construction on the surrounding environment;

[0051] (4) The branching segment design of this utility model allows water flow to be more flexibly distributed to different generators, which helps to optimize the utilization of water resources and improve the operating efficiency and stability of the power station.

[0052] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An ultra-high rated head pumped storage power plant water diversion system, characterized by, The application relates to a water diversion system of a pumped storage power station. The water diversion system comprises: an upstream straight section, N-stage vertical shafts and N-stage branched sections in a tree shape; one end of the upstream straight section is connected with an upstream reservoir, and the other end is connected with the top end of the N-stage vertical shafts; the lower end of each stage vertical shaft is provided with a corresponding straight section, and is connected with a lower-stage vertical shaft through the straight section; each stage branched section is arranged on the straight section at the lower end of the corresponding stage vertical shaft, and each stage branched section is a sub-branched section of an upper-stage branched section; each stage branched section sequentially passes through the straight section and a lower-stage vertical shaft, and guides water flow to a lower-stage branched section; 2. The ultra-high head pumped storage power plant draft tube system of claim 1, wherein, in the N-stage branched sections, one end of the branched section at the endmost position is connected with an upper-stage branched section, and the other end is connected with a hydroelectric generator set.

3. The ultra-high head pumped storage power plant draft tube system of claim 2, wherein, Each stage branched section comprises at least one branched node and a plurality of branched branches connected with the branched node. Each branched node is arranged on a corresponding straight section.

4. The super-high head pumped storage power plant penstock system according to claim 2 or 3, characterized by, Correspondingly, the branched branches contained in each stage branched section are connected with a lower-stage vertical shaft or with a hydroelectric generator set.

5. The ultra-high head pumped storage power plant penstock system of claim 4, wherein, The branched node is a steel branched pipe.

6. The ultra-high head pumped storage power plant draft tube system of claim 4, wherein, When the branched node is a steel branched pipe, the steel branched pipe is an inner-reinforced crescent rib steel branched pipe.

7. The super-high head pumped storage power plant penstock system of claim 5 or 6, wherein, When the branched node is a steel branched pipe, the steel branched pipe is a symmetrical steel branched pipe.

8. The ultra-high head pumped storage power plant draft tube system of claim 1, wherein, The HD value of the steel branched pipe is less than or equal to 4500 m.m.

9. The ultra-high head pumped storage power plant draft tube system of claim 1, wherein, The rated water head of the water diversion system of the pumped storage power station is greater than or equal to 650 m. The N-stage vertical shafts are 2-3 stage vertical shafts.

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