A layered water taking device for a hydropower station

Abstract

The utility model provides a layered water taking device of hydropower station. Layered water taking device of hydropower station includes the enclosure curtain, wing wall and floating device, the wing wall is spaced apart and is arranged with a plurality of in perpendicular to the water flow direction, the enclosure curtain is arranged with a plurality of horizontal traction ropes, the horizontal traction rope is along the height interval arrangement of enclosure curtain, every wing wall's water face is equipped with a vertical extension's slide groove, every slide groove is provided with at least one floating device, one end of floating device is connected in slide groove, the other end of floating device is connected with horizontal traction rope, the enclosure curtain is integrated and covers on the water face of wing wall. The utility model designs the enclosure curtain as the structure of whole picture, and its size only needs to match the distance between both ends wing wall, so that the processing is more easily guaranteed, and the whole picture of the enclosure curtain can cover all the wing walls arranged in the middle, so that the water taking effect is better.

Description

Technical Field

[0001] This utility model relates to the field of water environment management technology, and in particular to a stratified water intake device for hydropower stations. Background Technology

[0002] Large and medium-sized hydropower projects with high dams and large reservoirs have large reservoir capacities and deep water, which alters the spatial and temporal distribution of the original natural river water temperature. The reservoir water temperature generally exhibits vertical temperature stratification, with significant differences between the surface and bottom temperatures. Furthermore, the water intake of the diversion and power generation system typically uses deep holes for water intake, resulting in significant differences in the temperature of the discharged water compared to the natural river water at certain times. This differentially temperatured discharge can have adverse effects on the downstream ecological environment.

[0003] Hydropower projects mitigate the problem of discharging water with varying temperatures by implementing stratified water intake measures to control the water intake elevation of the power station. Currently, medium and large-scale hydropower projects both domestically and internationally employ measures such as stacked beam gates, front retaining walls, and water-tight curtain walls. However, existing measures have many problems. For example, stacked beam gates are constructed within the intake gate slot and are detachable steel gate structures, resulting in significant investment, substantial head loss during operation, and complex operation scheduling. Front retaining walls are constructed tens of meters upstream of the intake and are fixed reinforced concrete walls, which cannot adapt to high water levels and have poor water temperature recovery. Water-tight curtain walls are constructed hundreds of meters upstream of the intake and are large-span, impermeable, flexible structures designed to block water, presenting challenges such as high construction difficulty, substantial investment, and disruption to flood discharge and navigation.

[0004] Existing stratified water intake devices, such as the stratified water intake structure for a hydropower station disclosed in patent publication number CN118911090A, include wing walls and a flexible structure. Slide grooves are provided on both sides of the wing walls. The flexible structure contains multiple first and second traction ropes. Each first traction rope has a float and a connecting device at both ends, and each second traction rope has a connecting device at both ends. The connecting devices are slidably disposed within the slide grooves. This design has the following two problems: (i) A groove is opened on the side of the wing wall so that the traction rope is disconnected. As a result, the curtain is also a disconnected single-panel structure that is only set between two wing walls. When the curtain is folded and bulged, gaps will be formed on both sides of the wing wall, causing water leakage and reducing the water intake effect. Moreover, the disconnected structure requires precise measurement of the distance between each pair of wing walls, which increases the difficulty of processing. (ii) The floating box is only set at the upper end of the flexible structure (i.e., on the first traction rope), and its response to the rise and fall with the water level is poor. Utility Model Content

[0005] The purpose of this invention is to provide a stratified water intake device for hydropower stations to improve water intake efficiency.

[0006] The technical solution of this utility model is: a layered water intake device for a hydropower station, comprising a retaining curtain, wing walls, and floating devices. Multiple wing walls are spaced apart perpendicular to the water flow direction. Multiple transverse traction ropes are arranged on the retaining curtain, spaced apart along the height of the retaining curtain. Each wing wall has a vertically extending groove on its water-facing surface, and at least one floating device is installed in each groove. One end of the floating device is slidably connected to the groove, and the other end is connected to the transverse traction ropes. The retaining curtain is integrally covered on the water-facing surface of the wing walls.

[0007] In the above scheme, the chute is set on the water-facing side of the wing wall. This allows the enclosure curtain to be processed into an integral, one-piece structure. On the one hand, the size of the integral structure only needs to match the distance between the two outer wing walls, making the processing easier to ensure. On the other hand, the one-piece enclosure curtain can completely cover the wing walls arranged in the middle, reducing water leakage and improving the water intake effect.

[0008] Preferably, the number of floating devices in each chute corresponds one-to-one with the number of transverse traction ropes.

[0009] Preferably, the floating device includes a connector and a buoy, one end of the connector is slidably connected to the groove, the other end of the connector is connected to the buoy, and the lateral traction rope is connected to the buoy.

[0010] Preferably, a retaining wall is provided between the lower ends of every two wing walls. The retaining wall is located below the retaining curtain. The retaining curtain is provided with multiple vertical traction ropes connected to multiple horizontal traction ropes. Each of the vertical traction ropes is fixed to the retaining wall by an anchor.

[0011] Preferably, the lower end of the vertical traction rope is connected to a counterweight chain, which hangs downward from the anchor.

[0012] Preferably, the hoarding curtain further includes a curtain, and the horizontal traction rope includes a main traction rope and multiple secondary traction ropes. The main traction rope is located at the top of the hoarding curtain, and the multiple secondary traction ropes are spaced apart from each other along the height direction of the hoarding curtain. The curtain is connected to the multiple secondary traction ropes.

[0013] Preferably, a transverse connecting bridge is connected between the upper ends of the plurality of wing walls, and the transverse traction rope is spaced apart from the transverse connecting bridge.

[0014] Compared with related technologies, the beneficial effects of this utility model are as follows: First, this utility model opens the sliding groove on the water-facing surface of the wing wall, which allows the enclosure curtain to be processed into an integral, one-piece structure. On the one hand, the size of the integral structure only needs to match the distance between the two outer wing walls, making the processing easier to ensure. On the other hand, the whole enclosure curtain can completely cover the wing walls arranged in the middle, reducing water leakage and making the water intake effect better. Second, this utility model connects each horizontal traction rope to the pontoon, so that the curtain forms multiple points in the height direction. These multiple points can change with the water level, respond actively, and improve water intake efficiency. Attached Figure Description

[0015] Figure 1 A frontal view of the hydropower station stratified water intake device provided by this utility model when the reservoir is at the normal water level. Figure 2 for Figure 1 Side view; Figure 3 A frontal view of the hydropower station stratified water intake device provided by this utility model when the reservoir is at a dead water level; Figure 4 for Figure 3 Side view; Figure 5 This is a top sectional view of the hydropower station stratified water intake device provided by this utility model.

[0016] In the attached diagram: 1. Enclosure wall; 2. Curtain; 3. Wing wall; 4. Horizontal connecting bridge; 5. Longitudinal connecting bridge; 6. Main traction rope; 7. Secondary traction rope; 8. Vertical traction rope; 9. Floating box; 10. Slide chute; 11. Connector; 12. Anchor nail; 13. Gantry frame; 14. Counterweight chain; 15. Water pipe; 16. Trash rack; 17. Gate slot; 18. Enclosure curtain; 19. Horizontal traction rope; 20. Floating device; 21. Concrete vertical wall. Detailed Implementation

[0017] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0018] like Figure 1 , Figure 2As shown, the hydropower station layered water intake device provided in this embodiment includes a retaining wall 1, a wing wall 3, a transverse connecting bridge 4, a longitudinal connecting bridge 5, an anchor 12, a gantry frame 13, a counterweight chain 14, a water intake pipe 15, a trash rack 16, a gate slot 17, a retaining curtain 18, a floating device 20, and a concrete vertical wall 21.

[0019] like Figure 2 , Figure 5 As shown, the concrete wall 21 spans the reservoir and is perpendicular to the water flow direction. The concrete wall 21 has openings. A debris barrier 16 is installed at the front of the concrete wall 21, and a water intake pipe 15 is connected to it at the rear. The end of the water intake pipe 15 communicates with the openings. The concrete wall 21 also has a gate slot 17, located between the debris barrier 16 and the water intake pipe 15. A gate is installed in the gate slot 17. The water flow is controlled and the water volume is regulated by raising and lowering the gate along the gate slot 17. The debris barrier 16 consists of a metal frame and bars, and its function is to block debris in the water flow, preventing it from entering the water intake pipe 15 and damaging equipment such as the turbine, thus ensuring the safe operation of the power station. The water intake pipe 15 is made of high-strength material, and its function is to introduce water into the turbine and other power generation equipment, providing a power source for the turbine and ensuring the stable operation of the power station.

[0020] The wing walls 3 are reinforced concrete walls, with multiple wing walls arranged perpendicular to the water flow direction. The wing walls 3 are located in front of the trash rack 16. The wing walls 3 stand vertically on a solid foundation at the front of the inlet, and their height is higher than the normal water level of the reservoir. Vertically extending chutes 10 are provided on the water-facing surface of the wing walls 3. Figure 2 As shown, each of the chutes 10 is slidably connected to multiple floating devices 20. Each floating device 20 includes a connector 11 and a buoy 9. One end of the connector 11 is slidably connected to the chute 10, and the other end is connected to the buoy 9. The transverse traction rope 19 is connected to the buoy 9 at the corresponding position. A roller can be mounted on the end of the connector 11 via a rotating shaft. A slide rail can be installed in the chute 10, and the roller is connected to the slide rail, allowing the floating devices 20 and the enclosure curtain 18 to vertically float and adjust within the chute 10 according to water level changes (e.g., ...). Figure 2 , Figure 4 (As shown). The shell of the float 9 is made of high-strength corrosion-resistant metal, and the interior is filled with lightweight corrosion-resistant foam.

[0021] The enclosure curtain 18 includes multiple horizontal traction ropes 19, vertical traction ropes 8 connected vertically to the multiple horizontal traction ropes 19, and a curtain 2 connected to the horizontal traction ropes 19 and the vertical traction ropes 8. Each horizontal traction rope 19 includes a main traction rope 6 at its upper end and multiple secondary traction ropes 7 spaced apart along the height direction of the enclosure curtain 18. The curtain 2 is connected to the multiple secondary traction ropes 7, and the main traction ropes 6 are spaced apart from the curtain 2, thereby ensuring sufficient flow capacity. The number of floating devices 20 corresponds to the number of horizontal traction ropes 19 and they are connected one-to-one.

[0022] The main traction rope 6 is a high-strength steel wire bundle with an outer protective layer. The secondary traction rope 7 is a composite carbon fiber rope. Each of the vertical traction ropes 8 is fixed to the enclosure wall 1 by anchors 12. The lower end of each vertical traction rope 8 is connected to a counterweight chain 14, which hangs down from the anchors 12, causing the lower edge of the curtain 2 to hang down from the top of the enclosure wall 1, thus reducing leakage of water from the bottom due to temperature differences.

[0023] A retaining wall 1 is installed between the lower ends of every two wing walls 3, and the elevation of the retaining wall 1 is lower than the dead water level of the reservoir (e.g., ...). Figure 3 As shown in the diagram, this ensures sufficient flow capacity under dead water conditions, and that the structural stress and flow pattern are safe and controllable. The bottom of the retaining wall 1 is connected to the bottom of the reservoir, forming a rigid enclosure.

[0024] Each of the wing walls 3 is connected to the concrete vertical wall 21 by a longitudinal connecting bridge 5. The longitudinal connecting bridge 5 is a reinforced concrete bridge body and can be used as a maintenance platform for the operation and maintenance of metal mechanical structures and electronic and electrical equipment. A transverse connecting bridge 4 is connected between the tops of two adjacent wing walls 3, and a gantry frame 13 is movably connected to the transverse connecting bridge 4. Example

[0025] Built on the basis of a reservoir in the upper reaches of the Lancang River, with an average annual flow of 677 m³ / h 3 After the reservoir is filled, a significant temperature stratification occurs in the reservoir area, causing the temperature of the discharged water to be lower than the natural temperature during spring and summer, which adversely affects the spawning and reproduction of fish downstream. In order to ensure that the fish have suitable water temperature conditions during the spawning period, it is necessary to build a retaining structure upstream of the power station intake to increase the temperature of the discharged water.

[0026] Wing walls 3 stand vertically on a solid foundation at the front of the intake, spaced approximately 28m apart, totaling 5 wing walls 3, forming a 4-span structure. The wing walls are made of reinforced concrete and measure approximately 14m × 2.45m × 36m (length × width × height). The longitudinal connecting bridge 5 is also made of reinforced concrete and measures approximately 24m × 2.45m × 1m (length × width × height). The retaining wall 1 is constructed parallel to the intake at approximately 20m in front of the intake. The wall is made of reinforced concrete and measures approximately 114m × 2.5m × 13m (length × width × height), connecting to the wing walls 3 on both sides.

[0027] The chute 10 has a length × width × height of approximately 19m × 0.5m × 0.7m, and its vertical range extends from the top of the wing wall 3 to the normal water level. A metal slide rail with a thickness of approximately 0.1m is pre-installed inside the chute 10. Multiple sets of sliding connectors 11 are pre-installed inside the chute 10. Each set of connectors 11 consists of a roller and a shaft, made of high-strength, corrosion-resistant metal, with the roller diameter approximately 0.5m.

[0028] The main traction rope 6 is tensioned to rollers on the wing walls 3 at both ends. It is made of high-strength steel wire bundles, approximately 0.3m in diameter, and wrapped with a flexible plastic protective layer, which is then sheathed with an aluminum sheath. After wrapping, the main cable diameter is 0.5m. The secondary traction rope 7 is tensioned to rollers on the wing walls 3 at both ends. It is made of composite carbon fiber rope, approximately 0.2m in diameter, and serves as the main load-bearing structure. The pontoon 9 has dimensions of approximately 3m × 1.5m × 0.5m (length × width × height) and a flat surface facing the water. The vertical traction rope 8 and the horizontal traction rope 19 are intersected to form a rope net. The vertical traction rope 8 is made of composite carbon fiber rope, approximately 0.15m in diameter, and serves as a rope net shape adjustment structure.

[0029] The curtain 2 is a flexible water-blocking structure that is laid in a continuous manner on the water-facing end of the wing wall 3. The material is a waterproof, high-load-bearing flexible fabric. The upper edge of the curtain 3 maintains an 8m flow passage height with the main traction rope 6. The lower edge of the curtain 3 extends to slightly below the top of the enclosure wall 1 and is suspended by a counterweight chain 14.

[0030] Numerical simulation analysis shows that the total load on the enclosure system is 671t, and the maximum flow velocity is approximately 1.4m / s.

[0031] Numerical simulation analysis shows that after implementation, this device can increase the discharge water temperature during the spring spawning season in May from 17.3℃ to 22.8℃. Therefore, this embodiment demonstrates a very good effect in improving discharge water temperature and has significant potential for wider application.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A stratified water intake device for a hydropower station, comprising a retaining wall (18) and wing walls (3), wherein multiple wing walls (3) are spaced apart perpendicular to the water flow direction, characterized in that, It also includes a floating device (20), and a plurality of horizontal traction ropes (19) are arranged on the enclosure curtain (18). The horizontal traction ropes (19) are arranged at intervals along the height of the enclosure curtain (18). Each wing wall (3) has a vertically extending chute (10) on its water-facing surface. Each chute (10) is provided with at least one floating device (20). One end of the floating device (20) is slidably connected to the chute (10), and the other end of the floating device (20) is connected to the horizontal traction rope (19). The enclosure curtain (18) is integrally covered on the water-facing surface of the wing wall (3).

2. The hydropower station stratified water intake device according to claim 1, characterized in that, The number of floating devices (20) in each chute (10) corresponds one-to-one with the number of transverse traction ropes (19).

3. The hydropower station stratified water intake device according to claim 1, characterized in that, The floating device (20) includes a connector (11) and a buoy (9). One end of the connector (11) is slidably connected to the groove (10), and the other end of the connector (11) is connected to the buoy (9). The transverse traction rope (19) is connected to the buoy (9).

4. The hydropower station stratified water intake device according to claim 1, characterized in that, A retaining wall (1) is provided between the lower ends of each pair of wing walls (3). The retaining wall (1) is located below the retaining curtain (18). The retaining curtain (18) is provided with multiple vertical traction ropes (8) connected to multiple horizontal traction ropes (19). Each of the vertical traction ropes (8) is fixed to the retaining wall (1) by an anchor (12).

5. The hydropower station stratified water intake device according to claim 4, characterized in that, The lower end of the vertical traction rope (8) is connected to a counterweight chain (14), which hangs down from the anchor (12).

6. The hydropower station stratified water intake device according to claim 1, characterized in that, The enclosure curtain (18) also includes a curtain (2), and the horizontal traction rope (19) includes a main traction rope (6) and multiple secondary traction ropes (7). The main traction rope (6) is located at the top of the enclosure curtain (18), and the multiple secondary traction ropes (7) are arranged at intervals from the height direction of the enclosure curtain (18). The curtain (2) is connected to the multiple secondary traction ropes (7).

7. The hydropower station stratified water intake device according to claim 1, characterized in that, A transverse connecting bridge (4) is connected between the upper ends of multiple wing walls (3), and the transverse traction rope (19) is spaced apart from the transverse connecting bridge (4).

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