Hydraulic structure for avoiding sediment and gravel of pumped storage power station

Abstract

The utility model discloses a hydraulic structure for avoiding sediment and gravel passing through a pumped storage power station, which relates to the technical field of pumped storage power stations and comprises a tailrace tunnel, one end of the tailrace tunnel is communicated with a downstream surge chamber, and the other end of the tailrace tunnel is communicated with a lower reservoir water inlet / outlet. A slope section is arranged on the bottom wall of the tailrace tunnel, two sets of slag collecting pits are formed in the slope section, a certain distance exists between the two sets of slag collecting pits and a downstream surge chamber, and the end of the tailrace tunnel is connected with a construction adit blocking body. When the device is used, water mixed with silt and gravel enters the reservoir through the downstream surge chamber, the tail water tunnel and the lower reservoir water inlet / outlet in sequence, and the silt and gravel can be automatically intercepted and accumulated in the inner cavity of the slag collecting pit, so that the possible adverse effect of the silt and gravel on the safe operation of a pumped storage power station unit is reduced; a worker enters the tailrace tunnel, and passing conditions are conveniently provided for cleaning silt and gravel in the slag collecting pit.

Description

Technical Field

[0001] The utility model relates to the technical field of pumped storage power stations, in particular to a hydraulic structure for avoiding mud, sand and gravel passing through a pumped storage power station. Background Art

[0002] A pumped storage power station is a special type of hydroelectric power plant. Its core function is to use the electricity during the low load period to pump water to the upper reservoir for energy storage, and then release the water to the lower reservoir for power generation during the peak load period. For pumped storage power stations with a long tailwater tunnel, a corresponding downstream surge chamber is usually arranged. The tailwater tunnel is connected to the inlet / outlet of the lower reservoir on the vertical surface, and then connected to the lower reservoir.

[0003] During the flood season, the amount of sediment brought into the reservoir by the natural flood in the lower reservoir increases, and gravel may also be carried into the tailwater tunnel. These sediments and gravel are deposited at low elevations, and after the flood season, they may have an adverse impact on the safe operation of the pumped storage power station units. Utility Model Content

[0004] In order to improve the above-mentioned problem of sediment, gravel and the like brought by natural floods in the lower reservoir entering the tailwater tunnel flow channel and causing siltation, the utility model provides a hydraulic structure for avoiding sediment and gravel passing through the pumped storage power station.

[0005] The utility model provides a hydraulic structure for avoiding sediment and gravel from passing through a pumped storage power station, and adopts the following technical solutions:

[0006] A hydraulic structure for avoiding mud, sand and gravel passing through a pumped storage power station, comprising a tailwater tunnel, one end of the tailwater tunnel being connected to a downstream surge chamber, the other end of the tailwater tunnel being connected to a lower reservoir inlet / outlet, a slope section being provided on the bottom wall of the tailwater tunnel, two groups of slag collecting pits being provided at the slope section, a certain distance being between the two groups of slag collecting pits and the downstream surge chamber, and a construction branch tunnel plugging body being connected to the end of the tailwater tunnel.

[0007] By adopting the above technical solution, water mixed with mud, sand and gravel enters the reservoir in sequence through the downstream surge tank, tailwater tunnel and lower reservoir inlet / outlet, and the mud, sand and gravel can be automatically retained in the inner cavity of the slag pit in the accumulation zone.

[0008] Optionally, the intersection of the two groups of slag collection pits and the bottom plate of the tailwater tunnel is rounded.

[0009] By adopting the above technical solution and using a slag collecting pit with arc rounding treatment, the water flow can be smooth and water loss can be reduced as much as possible.

[0010] Optionally, the two groups of slag collecting pits are arranged alternately.

[0011] By adopting the above technical solution, the two groups of slag collection pits are staggered with each other, which can meet the requirements of personnel maintenance and passage.

[0012] Optionally, the distance between the two groups of slag collecting pits and the downstream surge chamber is greater than 3-5 times the diameter of the tailwater tunnel.

[0013] By adopting the above technical solution, since the distance between the slag collecting pit and the downstream surge chamber is large, the influence of the flow pattern of the downstream surge chamber caused by the inflow and outflow of water can be reduced as much as possible.

[0014] Optionally, a maintenance access door is provided on the construction branch tunnel sealing body, and the maintenance access door is connected to the tailwater tunnel.

[0015] By adopting the above technical solution, the staff uses the maintenance entry door to enter the inner cavity of the tailwater tunnel, which facilitates the provision of passage conditions for cleaning the mud, sand and gravel in the inner cavity of the slag pit.

[0016] In summary, the present invention has at least one of the following beneficial effects:

[0017] The water mixed with silt and gravel enters the reservoir through the downstream surge chamber, tailwater tunnel and lower reservoir inlet / outlet in sequence. The silt and gravel can be automatically retained in the inner cavity of the slag pit of the accumulation zone, reducing the adverse effects of silt and gravel on the safe operation of the pumped storage power station units;

[0018] The staff uses the maintenance entry door to enter the inner cavity of the tailwater tunnel, providing convenient passage conditions for cleaning the mud, sand and gravel in the inner cavity of the slag pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3 For this utility model Figure 1 Schematic diagram of the structure of part A from the side.

[0022] In the figure: 1. Downstream surge chamber; 2. Lower reservoir inlet / outlet; 3. Tailwater tunnel; 4. Slag collection pit; 5. Construction branch tunnel sealing body; 6. Maintenance entrance door. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-3 The utility model is described in further detail.

[0024] Please refer to the attached figure in the instruction manual Figure 1 , 23. An embodiment of the utility model is: a hydraulic structure for avoiding mud, sand and gravel passing through a pumped storage power station, comprising a tailwater tunnel 3, one end of the tailwater tunnel 3 is connected to a downstream surge chamber 1, the other end of the tailwater tunnel 3 is connected to a lower reservoir inlet / outlet 2, the bottom wall of the tailwater tunnel 3 is provided with a slope section, two groups of slag collecting pits 4 are provided on the bottom plate at a low elevation of the slope section, there is a certain distance between the two groups of slag collecting pits 4 and the downstream surge chamber 1, and the end of the tailwater tunnel 3 is connected to a construction branch tunnel plugging body 5.

[0025] The water mixed with mud, sand and gravel enters the reservoir through the downstream surge chamber 1, the tailwater tunnel 3 and the lower reservoir inlet / outlet 2 in sequence. The mud, sand and gravel can be automatically retained in the inner cavity of the accumulation zone slag pit 4, reducing the adverse effects of the mud, sand and gravel on the safe operation of the pumped storage power station units.

[0026] Please refer to the attached figure in the instruction manual Figure 1 , 2 and 3, the arc is rounded at the intersection of the two groups of slag collection pits 4 and the bottom plate of the tailwater tunnel 3. The slag collection pit 4 with arc rounding can make the water flow smooth and reduce water loss as much as possible.

[0027] Please refer to the attached figure in the instruction manual Figure 1 , 2 And 3, two groups of slag collection pits 4 are arranged in an interlaced manner. The two groups of slag collection pits 4 are arranged in an interlaced manner to meet the requirements of personnel maintenance and passage.

[0028] Please refer to the attached figure in the instruction manual Figure 1 , 2 and 3, the distance between the two groups of slag collecting pits 4 and the downstream surge chamber 1 is greater than 3-5 times, preferably 4 times, the diameter of the tailwater tunnel 3. Since the distance between the slag collecting pits 4 and the downstream surge chamber 1 is large, the influence of the flow pattern of the water inflow and outflow on the downstream surge chamber 1 can be reduced as much as possible.

[0029] Please refer to the attached figure in the instruction manual Figure 1 , 2 3. A maintenance access door 6 is provided on the construction branch tunnel plugging body 5, and the maintenance access door 6 is connected to the tailwater tunnel 3. When performing maintenance, the staff uses the maintenance access door 6 to enter the inner cavity of the tailwater tunnel 3, which is convenient for providing passage conditions for cleaning the mud, sand and gravel in the inner cavity of the slag pit 4.

[0030] Working principle: When using the hydraulic structure for avoiding silt and gravel passing through the pumped-storage power station, water mixed with silt and gravel enters the reservoir through the downstream surge chamber 1, the tailwater tunnel 3 and the lower reservoir inlet / outlet 2 in turn, and the silt and gravel can be automatically retained in the inner cavity of the slag pit 4 of the accumulation zone, reducing the adverse effects of silt and gravel on the safe operation of the pumped-storage power station units. The slag pit 4 with arc rounding treatment can make the water flow smooth and minimize water loss.

[0031] At the same time, since the distance between the slag collecting pit 4 and the downstream surge chamber 1 is large, the impact of the water inflow and outflow on the flow state of the downstream surge chamber 1 can be reduced as much as possible. When carrying out maintenance, the staff uses the maintenance entry door 6 to enter the inner cavity of the tailwater tunnel 3, which is convenient for providing passage conditions for the mud, sand and gravel in the inner cavity of the slag collecting pit 4. The two groups of slag collecting pits 4 are staggered with each other to meet the requirements of personnel maintenance passage.

[0032] The standard parts used in the present utility model document can all be purchased from the market. The various components in the present utility model document can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0033] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A hydraulic structure for avoiding sediment and gravel in a pumped storage power station, comprising a tailwater tunnel (3), characterized in that: One end of the tailwater tunnel (3) is connected to a downstream surge chamber (1), and the other end of the tailwater tunnel (3) is connected to a lower reservoir inlet / outlet (2). The bottom wall of the tailwater tunnel (3) is provided with a slope section, and two groups of slag collecting pits (4) are opened at the slope section. There is a certain distance between the two groups of slag collecting pits (4) and the downstream surge chamber (1). The end of the tailwater tunnel (3) is connected to a construction branch tunnel plugging body (5).

2. A hydraulic structure for avoiding sediment and gravel from passing through a pumped storage power station according to claim 1, characterized in that: The intersection of the two groups of slag collection pits (4) and the bottom plate of the tailwater tunnel (3) is rounded.

3. A hydraulic structure for avoiding sediment and gravel in a pumped storage power station according to claim 1, characterized in that: The two groups of slag collecting pits (4) are arranged alternately.

4. A hydraulic structure for avoiding sediment and gravel in a pumped storage power station according to claim 1, characterized in that: The distance between the two groups of slag collecting pits (4) and the downstream surge chamber (1) is greater than 3-5 times the diameter of the tailwater tunnel (3).

5. A hydraulic structure for avoiding sediment and gravel in a pumped storage power station according to claim 1, characterized in that: The construction branch tunnel plugging body (5) is provided with a maintenance access door (6), and the maintenance access door (6) is connected to the tailwater tunnel (3).

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