Seawater pumped storage power station's anti-seepage structure and anti-seepage system

Abstract

The utility model provides a kind of anti-infiltration structure and anti-infiltration system of seawater pumped storage power station belong to hydroelectric technology field, this anti-infiltration structure includes cushion layer, first anti-infiltration layer and second anti-infiltration layer.Wherein, the cushion layer is set on foundation, and the cushion layer is sand mixed cushion layer;The first anti-infiltration layer is set on the cushion layer, and the first anti-infiltration layer is concrete layer;The second anti-infiltration layer is set on the first anti-infiltration layer, and the second anti-infiltration layer includes geomembrane layer.The anti-infiltration structure of the utility model effectively enhances the reliability of anti-infiltration structure, reduces or avoids the seepage of the reservoir basin that accumulates seawater, to avoid the adverse effects on the upper reservoir bank slope stability and surrounding groundwater environment etc.

Description

Technical Field

[0001] This utility model relates to the field of hydropower technology, specifically to a seepage prevention structure and seepage prevention system for a seawater pumped storage power station. Background Technology

[0002] For ordinary freshwater pumped storage power stations, seepage prevention in the upper reservoir basin is crucial. Leakage in the upper reservoir can affect the safety of adjacent structures and the stability of the bank slopes. At the same time, water loss means power loss, thereby reducing the economic efficiency of the power station.

[0003] Currently, conventional pumped storage power stations typically employ a full-reservoir seepage prevention system for their upper reservoirs, using clay lining for the bottom and concrete panel slope protection. This seepage prevention structure is designed for freshwater media. However, seawater is far more corrosive to seepage prevention materials than freshwater pumped storage. Prolonged seawater immersion in the seepage prevention structure of conventional pumped storage power stations can lead to a decrease in the load-bearing capacity of the asphalt concrete. Furthermore, seawater leakage would have a greater impact on the surrounding ecological environment. Therefore, seawater pumped storage power stations place higher demands on their reservoir seepage prevention systems.

[0004] Therefore, there is a need to provide a seepage prevention structure and system for a seawater pumped storage power station to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides a seepage prevention structure and seepage prevention system for a seawater pumped storage power station, so as to improve the technical problem of poor corrosion resistance of existing reservoir seepage prevention structures to seawater media.

[0006] To achieve the above and other related objectives, this utility model provides a seepage prevention structure for a seawater pumped storage power station. The pumped storage power station has a reservoir basin, and the seepage prevention structure is installed on the reservoir basin. The seepage prevention structure includes a cushion layer, a first seepage prevention layer, and a second seepage prevention layer.

[0007] The cushion layer is placed on the foundation and is a sand-soil mixture cushion layer; the first impermeable layer is placed on the cushion layer and is a concrete layer; the second impermeable layer is placed on the first impermeable layer and includes a geomembrane layer.

[0008] In one example of this utility model, the bottom surface of the cushion layer is matched and fitted with the foundation, and the top surface of the cushion layer is matched with the surface shape of the reservoir basin.

[0009] In one example of this invention, the permeability coefficient of the underlayment is less than or equal to 1 × 10⁻⁶. -7 cm / s, and the thickness of the padding layer is greater than or equal to 100 mm.

[0010] In one example of this utility model, the first impermeable layer has a crack repair function.

[0011] In one example of this utility model, multiple glass fiber reinforcement bars are laid within the concrete layer.

[0012] In one example of this utility model, the thickness of the first impermeable layer is greater than or equal to 150 mm.

[0013] In one example of this invention, the geomembrane layer comprises a high-density polyethylene geomembrane.

[0014] In one example of this invention, the permeability coefficient of the second impermeable layer is less than or equal to 1×10⁻⁶. -12 cm / s, and the thickness of the second impermeable layer is greater than or equal to 2 mm.

[0015] This utility model also provides a seepage prevention system for a seawater pumped storage power station, which includes a reservoir basin, a light detection system, and a thermal control system.

[0016] The reservoir basin is provided with the seepage-proof structure described in any of the above examples; the thermal control system includes a thermal control device and multiple heating wires, the multiple heating wires being connected to the thermal control device and laid in the seepage-proof structure; the optical detection system includes an optical control device and multiple temperature-sensing optical fibers, the multiple temperature-sensing optical fibers being connected to the optical control device and laid in the seepage-proof structure, the temperature-sensing optical fibers being arranged adjacent to the heating wires.

[0017] In one example of this utility model, the temperature-sensing optical fiber and the heating wire are laid between the first impermeable layer and the second impermeable layer.

[0018] The seepage prevention structure of the seawater pumped storage power station provided by this utility model has a second seepage prevention layer of geomembrane layer set on the concrete layer of the first seepage prevention layer. The strong mechanical ductility, excellent chemical corrosion resistance and ultra-low permeability of the thin geomembrane layer are used to protect the concrete layer that maintains the inner wall structure of the reservoir basin and undertakes the seepage prevention function, thereby enhancing the reliability of the seepage prevention structure, reducing or avoiding leakage of the reservoir basin that stores seawater, and thus avoiding adverse effects on the stability of the upper reservoir slope and the surrounding groundwater environment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the anti-seepage structure in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the seepage prevention system in one embodiment of the present invention;

[0022] Figure 3 This is a structural block diagram of the seepage prevention system in one embodiment of the present invention.

[0023] Component designation explanation

[0024] 10. Foundation; 20. Reservoir basin; 30. Seepage-proof structure; 31. Subbase; 32. First seepage-proof layer; 321. Fiberglass reinforcement; 33. Second seepage-proof layer; 50. Light control device; 60. Temperature-sensing optical fiber; 70. Thermal control device; 80. Heating wire. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0026] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0027] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0028] Please see Figure 1 In a first aspect, this utility model provides a seepage-proof structure 30 for a seawater pumped storage power station. The power station has an upper reservoir containing a reservoir basin 20 capable of storing water. The inner wall surface of the reservoir basin 20 is provided with a seepage-proof structure 30. The seepage-proof structure 30 includes a cushion layer 31, a first seepage-proof layer 32, and a second seepage-proof layer 33.

[0029] Please see Figure 1 The cushion layer 31 is set on the foundation 10, the first impermeable layer 32 is set on the cushion layer 31, and the second impermeable layer 33 is set on the first impermeable layer 32.

[0030] The cushion layer 31 is a sand-soil mixture cushion layer, and the sand-soil mixing ratio in the cushion layer 31 can be, for example, 9:1. The cushion layer 31 serves as a transition layer between the first impermeable layer 32 and the foundation 10. The cushion layer 31 has a certain degree of flexibility to adapt to the shape of the foundation 10 and the first impermeable layer 32 on both the top and bottom sides. The bottom surface of the cushion layer 31 matches and fits the foundation 10, and can adapt to the deformation of the foundation 10 through its own deformation, so as to help the first impermeable layer 32 and the second impermeable layer 33 be stably configured on the foundation 10. The top surface of the cushion layer 31 matches the surface shape of the reservoir basin 20, so as to help the first impermeable layer 32 be shaped on the cushion layer 31 according to the surface shape of the reservoir basin 20.

[0031] The first impermeable layer 32 is a concrete layer, which has good seepage prevention performance and high mechanical strength, and can serve as the main structure of the inner wall of the reservoir basin 20. It should be noted that the type of concrete layer used in the first impermeable layer 32 is not limited. For example, the concrete layer can be at least one of cement concrete, polymer concrete and asphalt concrete.

[0032] The second impermeable layer 33 includes a geomembrane layer. It possesses good mechanical ductility, excellent chemical corrosion resistance, and ultra-low permeability. On the one hand, its excellent chemical corrosion resistance effectively resists seawater and ultraviolet corrosion; on the other hand, its good flexibility helps resist stress concentration and deformation cracking under water pressure, thus exhibiting superior puncture resistance. Thirdly, it maintains an intact impermeable interface in the seawater environment, effectively protecting the first impermeable layer 32, which has poor seawater corrosion resistance and bears the main structural weight of the inner wall of the reservoir basin 20.

[0033] likeFigure 1 As shown, in some embodiments, the permeability coefficient of the padding layer 31 is less than or equal to 1 × 10⁻⁶. -7 cm / s, for example, cushion layer 31 can be a cushion layer formed by mixing graded sand and bentonite.

[0034] like Figure 1 As shown, in some embodiments, the thickness of the cushion layer 31 is greater than or equal to 100 mm to ensure that the cushion layer 31 is sufficient to accommodate the deformation of the foundation 10 in the height direction.

[0035] like Figure 1 As shown, in some embodiments, the first impermeable layer 32 has a crack repair function. For example, in the first impermeable layer 32, a glass fiber reinforcement bar 321 is laid in the concrete layer, and multiple glass fiber reinforcement bars 321 are laid along the surface of the reservoir basin 20.

[0036] like Figure 1 As shown, in some embodiments, the thickness of the first impermeable layer 32 is greater than or equal to 150 mm.

[0037] like Figure 1 As shown, in some embodiments, the geomembrane layer in the second impermeable layer 33 comprises a high-density polyethylene geomembrane. The high-density polyethylene geomembrane has an extremely low permeability coefficient, allowing the permeability coefficient of the second impermeable layer 33 to be less than or equal to 1 × 10⁻⁶. -12 cm / s. High-density polyethylene (HDPE) geomembranes possess good chemical stability, effectively resisting chemical corrosion from strong acids, alkalis, salts, and oils, and exhibiting strong corrosion resistance in seawater environments. Furthermore, HDPE geomembranes also possess high tensile strength, a wide temperature range, and excellent anti-aging properties, ensuring the integrity of their impermeable interface in seawater environments.

[0038] like Figure 1 As shown, in some embodiments, the thickness of the second impermeable layer 33 is greater than or equal to 2 mm. This relatively thin second impermeable layer 33 is sufficient to achieve stable impermeability while also effectively protecting the surface of the first impermeable layer 32.

[0039] Please see Figures 1 to 3 Secondly, this utility model also provides a seepage prevention system for a seawater pumped storage power station. While realizing the seepage prevention function on the reservoir basin 20, the seepage prevention system can also locate the specific location where water medium leakage occurs in the seepage prevention structure 30, helping the staff to quickly and accurately repair the seepage prevention structure 30.

[0040] Please see Figures 1 to 3 The seepage prevention system includes a thermal control system, a light detection system, and the seepage prevention structure 30 in any of the above embodiments. The seepage prevention structure 30 is set on the inner wall surface of the reservoir basin 20.

[0041] The thermal control system includes a thermal control device 70 and multiple heating wires 80. The multiple heating wires 80 are connected to the thermal control device 70, and are laid in the seepage-proof structure 30. The multiple heating wires 80 are laid along the surface of the reservoir basin 20.

[0042] The optical detection system includes a light control device 50 and multiple temperature-sensing optical fibers 60. The multiple temperature-sensing optical fibers 60 are connected to the light controller, and both the light-inlet and light-outlet ends of the temperature-sensing optical fibers 60 are connected to the light control device 50. The multiple temperature-sensing optical fibers 60 are laid within the seepage-proof structure 30, along the surface of the reservoir basin 20. Each temperature-sensing optical fiber 60 is positioned adjacent to one of the multiple heating wires 80, thereby achieving comprehensive sensing of the seepage-proof interface of the seepage-proof structure 30.

[0043] The thermal control device 70 uses a heating power supply to control and increase the temperature of the heating wire 80, causing the heating wire 80 laid in the seepage-proof structure 30 to heat up to a preset constant temperature, thereby ensuring that the temperature-sensing optical fiber 60 in the seepage-proof structure 30 is in a preset constant temperature environment when there is no leakage. The optical control device 50 emits a short-pulse laser beam into the optical fiber and uses the scattered light signal formed by the pulse laser transmission in the temperature-sensing optical fiber 60 based on optical time-domain reflectometry to determine whether the temperature in the area traversed by the temperature-sensing optical fiber 60 has changed and the location of the temperature change. Based on this, when the seepage-proof structure 30 leaks, the temperature at the leak point changes due to the infiltration of water. The optical control device 50 can quickly detect the location of the stable change in the seepage-proof structure 30 through the distributed temperature-sensing optical fiber 60, and thus quickly determine the location of the leak point in the seepage-proof structure 30.

[0044] In some embodiments, the temperature-sensing optical fiber 60 and the heating wire 80 are laid between the first impermeable layer 32 and the second impermeable layer 33 so that when leakage occurs in the outermost layer of the impermeable structure 30, the leakage point can be located so that the staff can repair the leakage location in a timely manner.

[0045] like Figure 3 As shown, in some embodiments, the light control device 50 connects to the light input ends of multiple temperature-sensing optical fibers 60 via a built-in light source, and connects to the light output ends of the multiple temperature-sensing optical fibers 60 via an industrial control computer and a serial optical transceiver. The light control device 50 can be, for example, a DTS (Distributed Temperature Sensing System) host. The light input and output ends of the multiple temperature-sensing optical fibers 60 are integrated in an optical cable junction box. The multiple temperature-sensing optical fibers 60 are wound into an optical cable (such as a 24-core multimode optical cable lead cable) extending from the optical cable junction box to an optical cable splicing device near the reservoir basin 20, and then distributed and laid within the seepage-proof structure 30 within the reservoir basin 20 via the optical cable splicing device.

[0046] likeFigure 3 As shown, in some embodiments, the thermal control device 70 includes a heating power supply and a power switching device, with both ends of multiple wires connected to the heating power supply via the power switching device. Multiple heating wires 80 connected to the thermal control device 70 are distributed and laid within the seepage-proof structure 30 inside the reservoir basin 20 via an optical cable splicing device.

[0047] like Figure 3 As shown, in some embodiments, both the light control device 50 and the thermal control device 70 are located in the control cabinet room of the plant outside the upper reservoir embankment, and the control cabinet has an IP64 protection rating.

[0048] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A seepage-proof structure for a seawater pumped storage power station, characterized in that, The pumped storage power station has a reservoir basin, and the seepage prevention structure is installed on the reservoir basin. The seepage prevention structure includes: A cushion layer, wherein the cushion layer is disposed on the foundation, and the cushion layer is a sand-soil mixture cushion layer; The first impermeable layer is disposed on the cushion layer and is a concrete layer. The second impermeable layer is disposed on the first impermeable layer, and the second impermeable layer includes a geomembrane layer.

2. The seepage-proof structure according to claim 1, characterized in that, The bottom surface of the cushion layer is matched and fitted to the foundation, and the top surface of the cushion layer is matched to the shape of the reservoir basin surface.

3. The seepage-proof structure according to claim 1, characterized in that, The permeability coefficient of the cushion layer is less than or equal to 1×10⁻⁶. - 7 cm / s, and the thickness of the padding layer is greater than or equal to 100 mm.

4. The seepage-proof structure according to claim 1, characterized in that, The first impermeable layer has crack repair function.

5. The seepage-proof structure according to claim 4, characterized in that, Multiple fiberglass reinforcement bars are laid within the concrete layer.

6. The seepage-proof structure according to claim 1, characterized in that, The thickness of the first impermeable layer is greater than or equal to 150 mm.

7. The seepage-proof structure according to claim 1, characterized in that, The geomembrane layer includes a high-density polyethylene geomembrane.

8. The seepage-proof structure according to claim 1 or 7, characterized in that, The permeability coefficient of the second impermeable layer is less than or equal to 1×10⁻⁶. -12 cm / s, and the thickness of the second impermeable layer is greater than or equal to 2 mm.

9. A seepage prevention system for a seawater pumped storage power station, characterized in that, include: The seepage-proof structure according to any one of claims 1 to 8; A thermal control system includes a thermal control device and multiple heating wires, wherein the multiple heating wires are connected to the thermal control device and are laid in the seepage-proof structure; The optical detection system includes an optical control device and multiple temperature-sensing optical fibers. The multiple temperature-sensing optical fibers are connected to the optical control device and are laid in the anti-seepage structure. The temperature-sensing optical fibers are arranged adjacent to the heating wire.

10. The seepage prevention system according to claim 9, characterized in that, The temperature-sensing optical fiber and the heating wire are laid between the first impermeable layer and the second impermeable layer.

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