A drainage system for a pumped storage power station sump

Abstract

The utility model provides a kind of for pumped storage power station catch basin's sewage system, catch basin sets up intermediate partition, and the catch basin is divided into two catchment small well;The well bottom of catchment small well of each side is fixedly installed submersible sewage pump, and the export end of submersible sewage pump is communicated with the import end of a mutual exhaust pipeline, and the export end of mutual exhaust pipeline is located in the catchment small well of the other side.In the catch basin maintenance dredging when by the well bottom submersible sewage pump is mutually exhausted and switched operation, without being arranged to the catch basin cover plate upper, both reduce the water pump lift and motor power, save engineering investment and energy consumption;Facilitate the dredging operation of operation and maintenance personnel again.Simultaneously reduce the foundation height of submersible sewage pump and install the pressure wave prestop valve drain pipe mouth to the vicinity of submersible sewage pump suction inlet, and each time pressure wave prestop valve action drainage will flush the vicinity of water pump, reduce the frequency that submersible sewage pump is covered by silt, reduce the maintenance frequency and operation and maintenance cost, improve the safety of downhole operation.

Description

Technical Field

[0001] This utility model relates to the technical field of leakage drainage system for pumped storage power station buildings, specifically to a sewage discharge system for the water collection well of a pumped storage power station. Background Technology

[0002] Most existing and under-construction pumped-storage power stations lack gravity-flow drainage tunnels. Water seepage from the surrounding rock and equipment drainage within the powerhouse must be collected in a sump within the tunnel, and then pumped out of the tunnel by a seepage pump. Due to the actual operational requirements of the pumps, the bottom of the sump has a certain dead volume, meaning the water within this volume cannot be discharged by the seepage pump. Considering that water contains a certain amount of sediment, during the water collection process, sediment will deposit at the bottom of the sump, and over time, the deposited sediment will gradually increase and solidify. To ensure the normal operation of the drainage system, a sewage system is needed to drain the dead volume water at the bottom of the sump, allowing maintenance personnel to safely enter the sump for cleaning. Submersible sewage pumps are typically installed at the bottom of the sump.

[0003] In existing technologies, to prevent submersible sewage pumps placed at the bottom of sump wells from being covered by long-term deposited silt and thus malfunctioning, the foundations of these pumps are typically raised to reduce maintenance frequency. However, since water pumps have minimum submersion depth requirements, the higher the pump foundation, the greater the minimum submersion depth, and the larger the volume of residual water in the well after the pump discharges, which is detrimental to the safety of personnel entering the well. Furthermore, existing technologies typically involve the submersible sewage pump discharging water to the top of the sump well cover, followed by manual removal of the accumulated water from the bottom of the well to the outside of the well. This not only increases the pump head and motor power, leading to increased project investment and energy consumption, but also increases the workload of maintenance personnel, reduces work efficiency, and makes maintenance difficult. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an economical, energy-saving, and safe and convenient sewage discharge system for pumped storage power station sump wells, thereby solving the problems of safety hazards, high cost, high energy consumption, and difficult operation and maintenance in the background technology.

[0005] The technical solution adopted in this utility model is as follows:

[0006] This utility model provides a sewage discharge system for a pumped storage power station's collection well, comprising: a collection well (1), a submersible sewage pump (2), an interconnection pipe (3), a submersible sewage pump foundation (5), and an intermediate partition wall (13).

[0007] The central partition wall (13) is set at the center of the water collection well (1), and the water collection well (1) is divided into a first water collection well (11) on the right and a second water collection well (12) on the left by the central partition wall (13). The bottom of the water collection well on each side is fixedly installed with the submersible sewage pump foundation (5), and the submersible sewage pump (2) is fixedly installed on the top of the submersible sewage pump foundation (5). The outlet end of the submersible sewage pump (2) is connected to the inlet end of a drainage pipe (3). After the drainage pipe (3) crosses the central partition wall (13), its outlet end is located in the water collection well on the other side.

[0008] Preferably, the seepage and drainage of the entire underground plant are connected to the drainage corridor at the bottom of the plant; the drainage corridor is connected to the first water collection well (11) through the first buried pipe, and the drainage corridor is connected to the second water collection well (12) through the second buried pipe.

[0009] Preferably, the submersible sewage pump foundation (5) is a concrete foundation, with the top surface fixedly connected to the corresponding submersible sewage pump (2) by anchor bolts (10), and the bottom surface fixed to the bottom of the corresponding water collection well by steel bars or pre-embedded bolts.

[0010] Preferably, the height of the intermediate partition wall (13) is lower than the water collection well cover plate of the water collection well (1).

[0011] Preferably, each of the water collection wells is also equipped with a sewage flushing unit; the sewage flushing unit includes a pressure wave check valve drainage pipe (4), a leakage drainage pump (6), a control valve (7), a pressure wave check valve (8), and an isolation valve (9).

[0012] The leakage drainage pump (6) is installed in the well of each side of the water collection well. The outlet of the leakage drainage pump (6) is provided with the control valve (7) and connected to the leakage drainage main pipe. The branch outlet of the leakage drainage main pipe is connected in series with the isolation valve (9) and the pressure wave stop valve (8). The valve outlet of the pressure wave stop valve (8) is connected to the inlet of the pressure wave stop valve drainage pipe (4). The outlet of the pressure wave stop valve drainage pipe (4) is located around the suction port of the submersible sewage pump (2) on the same side and the foundation (5) of the submersible sewage pump.

[0013] Preferably, the height of the intermediate partition wall (13) is lower than the starting water level of the leakage drainage pump (6) in the water collection well.

[0014] The sewage discharge system for the water collection well of a pumped storage power station provided by this utility model has the following advantages:

[0015] This utility model discloses a sewage discharge system for the sump well of a pumped storage power station. During sump well maintenance and dredging, the system allows for switching between submersible sewage pumps at the bottom of the well, eliminating the need to discharge above the well cover. This reduces pump head and motor power, saving on project investment and energy consumption. It also facilitates dredging operations for maintenance personnel, reducing workload and improving efficiency. Furthermore, by lowering the foundation height of the submersible sewage pump and installing the pressure wave check valve's drain pipe near the pump's suction inlet, each pressure wave check valve activation flushes the area around the pump, reducing the frequency of silt accumulation and significantly decreasing maintenance frequency and costs, while also improving the safety of operations below the well. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sewage discharge system of the water collection well of the pumped storage power station provided by this utility model;

[0017] Figure 2 This is a schematic diagram of the drain port of the pressure wave pre-stop valve provided by this utility model.

[0018] in:

[0019] 1—Water collection well; 2—Submersible sewage pump; 3—Interconnecting pipe; 4—Pressure wave check valve drainage pipe; 5—Submersible sewage pump foundation; 6—Leakage drainage pump; 7—Control valve; 8—Pressure wave check valve; 9—Isolation valve; 10—Anchor bolt; 11—First water collection well; 12—Second water collection well; 13—Intermediate partition wall. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "both sides", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 and Figure 2 As shown, a sewage discharge system for a pumped storage power station's collection well according to this utility model includes: a collection well 1, a submersible sewage pump 2, an interconnecting pipe 3, a submersible sewage pump foundation 5, and an intermediate partition wall 13.

[0024] The intermediate partition wall 13 is located at the center of the water collection well 1. The height of the intermediate partition wall 13 is lower than the water collection well cover plate of the water collection well 1. The intermediate partition wall 13 divides the water collection well 1 into a first water collection well 11 on the right and a second water collection well 12 on the left. The equipment and pipeline layout in the first water collection well 11 and the second water collection well 12 are the same. All seepage and drainage in the entire underground plant are collected through the drainage corridor at the bottom of the plant and flow by gravity to the first water collection well 11 and the second water collection well 12 through buried pipes. The height of the intermediate partition wall 13 is slightly lower than the starting water level of the seepage drainage pump 6 in the water collection well to ensure that the start and stop of the seepage drainage pump 6 in the first water collection well 11 and the second water collection well 12 are not affected by the partition wall during normal operation. Furthermore, when the water collection well 1 needs to be inspected and dredged, the water flow from the drainage corridor to the water collection well on one side can be cut off by operating valves or temporarily sealing with blind flanges, thereby allowing the water collection well on the other side to be inspected.

[0025] The entire underground plant's seepage and drainage are connected to the drainage corridor at the bottom of the plant; the drainage corridor is connected to the first water collection well 11 through the first buried pipe, and the drainage corridor is connected to the second water collection well 12 through the second buried pipe.

[0026] The submersible sewage pump foundation 5 is fixedly installed at the bottom of each side's collection well. A submersible sewage pump 2 is fixedly installed on top of the foundation 5. The outlet end of the submersible sewage pump 2 is connected to the inlet end of an interconnecting pipe 3. After the interconnecting pipe 3 crosses the intermediate partition wall 13, its outlet end is located in the collection well on the other side. The submersible sewage pump foundation 5 is a concrete foundation. Its top surface is fixedly connected to the corresponding submersible sewage pump 2 via anchor bolts 10, and its bottom surface is fixed to the bottom of the corresponding collection well via reinforcing bars or pre-embedded bolts.

[0027] Specifically, there are two submersible sewage pumps 2, each placed at the bottom of a small sump. These pumps are used to remove water accumulated at the bottom of the sump during maintenance and dredging. A submersible sewage pump foundation 5 is installed below each pump; this foundation can be a concrete foundation or a steel support. The submersible sewage pump foundation 5 is connected to the sump 1 by reinforcing bars or pre-embedded bolts. The submersible sewage pump 2 is connected to its foundation 5 by pre-embedded anchor bolts to reduce vibration during operation. The two submersible sewage pumps 2 discharge water into the opposite sump through two interconnecting pipes 3.

[0028] When one side of the collection well is being repaired and dredged, the submersible sewage pump 2 discharges the water at the bottom of the well to the other side of the collection well via the interconnection pipe 3, so that maintenance personnel can go down into the well to operate. Moreover, the submersible sewage pump 2 does not need to lift the water to the collection well cover, which reduces the pump head and motor power, saving project investment and energy consumption.

[0029] Each of the small water collection wells on each side is also equipped with a sewage flushing unit; the sewage flushing unit includes a pressure wave check valve drainage pipe 4, a leakage drainage pump 6, a control valve 7, a pressure wave check valve 8, and an isolation valve 9; the leakage drainage pump 6 is installed inside the small water collection well on each side, and the outlet of the leakage drainage pump 6 is equipped with the control valve 7 and connected to the leakage drainage main pipe; the branch outlet of the leakage drainage main pipe is connected in series with the isolation valve 9 and the pressure wave check valve 8, and the valve outlet of the pressure wave check valve 8 is connected to the inlet of the pressure wave check valve drainage pipe 4; the outlet of the pressure wave check valve drainage pipe 4 is located around the suction port of the submersible sewage pump 2 on the same side and around the foundation 5 of the submersible sewage pump. The height of the intermediate partition wall 13 is lower than the starting water level of the leakage drainage pump 6 in the small water collection well.

[0030] According to the power station's operational requirements, multiple seepage drainage pumps 6 can be installed. A certain number of seepage drainage pumps 6 are divided into two groups, evenly distributed in two small water collection wells, for draining water from the wells. Each seepage drainage pump 6 has a control valve 7 at its outlet, which is connected to the main pipe of each group of seepage drainage pumps 6. To eliminate the impact of water hammer during the start-up and shutdown of the seepage drainage pumps 6, a pressure wave check valve 8 and its isolation valve 9 are installed on the main pipe of each group of seepage drainage pumps. The valve outlet of the pressure wave check valve 8 is connected to the pressure wave check valve drainage pipe 4. The drainage outlet of the pressure wave check valve drainage pipe 4 is located near the suction port of the submersible sewage pump 2 and the foundation 5 of the submersible sewage pump. Figure 1As shown. Whenever the leakage drainage pump 6 stops, the high-pressure water flow is discharged through the pressure wave check valve drainage pipe 4, flushing the silt around the submersible sewage pump 2 and preventing silt accumulation from covering the submersible sewage pump 2 and causing it to malfunction. At the same time, the submersible sewage pump foundation 5 is lowered, so that the submersible sewage pump 2 can discharge more water from the bottom of the well, reducing the frequency of maintenance and making it safer for personnel to work in the well.

[0031] The following description, using a large pumped storage power station that employs the technical solution of this utility model as an example, is further illustrated with reference to the accompanying drawings:

[0032] A large-scale pumped storage power station project adopts a deep-buried underground powerhouse layout. Due to the lack of conditions for constructing a gravity drainage tunnel, a collection well 1 for collecting seepage water is set up in the underground powerhouse. The well is 15m deep and is divided into two smaller collection wells by a partition wall 13: the first collection well 11 and the second collection well 12. Seepage water from hydraulic structures and drainage from various parts of the unit are collected in two separate channels through drainage corridors and drainage pipelines to the first collection well 11 and the second collection well 12. The collection well 1 is equipped with 6 seepage drainage pumps 6 and control valves 7. The seepage drainage pumps 6 are deep-well submersible pumps. Every 3 seepage drainage pumps 6 form a group, and the outlets of the seepage drainage pumps 6 converge into a main drainage pipe to discharge the water from the collection well 1 to the lower reservoir. Each main drainage pipe is equipped with a pressure wave check valve 8 and its isolation valve 9 to eliminate the water hammer effect when the leakage drainage pump 6 stops. Each small sump is equipped with a submersible sewage pump 2 at the bottom of the well for draining water at the bottom of the well during maintenance and dredging. There is a submersible sewage pump foundation 5 between the pump 2 and the bottom of the sump 1. The submersible sewage pump 2 and the submersible sewage pump foundation 5 are connected and fixed by pre-embedded anchor bolts. The submersible sewage pump foundation 5 and the bottom of the sump 1 are cast together by pre-reserved reinforcing bars. Assuming that when the first collection well 11 is being repaired and dredged, the pipeline from the lower drainage corridor to the first collection well 11 is sealed with a valve to cut off the water flow. The submersible sewage pump 2 in the first collection well 11 discharges water to the second collection well 12 through the inter-drainage pipe 3 pre-embedded in the well wall, and vice versa. The highest point of the inter-drainage pipe 3 is about 5m lower than the collection well cover. Lowering the foundation 5 of the submersible sewage pump can drain more water from the bottom of the well, making it easier for maintenance personnel to go down into the well. At the same time, to prevent silt from accumulating and covering the submersible sewage pump 2, causing it to malfunction, the pressure wave check valve drainage pipe 4 is pre-embedded from the outlet of the pressure wave check valve 8 to the vicinity of the suction port of the submersible sewage pump 2 and the foundation 5 of the submersible sewage pump. Whenever the leakage drainage pump 6 stops, the high-pressure water flow washes away the silt in that area. In this implementation method, the head of each submersible sewage pump 2 is reduced by about 10m and the power is reduced by about 40kW, saving on project investment and energy consumption.

[0033] By adopting the above-described technical solution of this utility model, the following beneficial effects are achieved:

[0034] A sewage discharge system for the sump of a pumped-storage power station allows for switching between submersible sewage pumps at the bottom of the sump during maintenance and dredging. This eliminates the need to discharge sewage above the sump cover, reducing pump head and motor power, thus saving on project investment and energy consumption. It also simplifies dredging operations for maintenance personnel, reducing workload and improving efficiency. Furthermore, by installing the pressure wave check valve's drain pipe near the submersible sewage pump's suction inlet, the daily operation of the check valve flushes the area around the pump, reducing the frequency of silt buildup and significantly lowering maintenance frequency and costs.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A sewage discharge system for a pumped storage power station's sump well, characterized in that, include: Water collection well (1), submersible sewage pump (2), interconnection pipeline (3), submersible sewage pump foundation (5) and intermediate partition wall (13); The central partition wall (13) is set at the center of the water collection well (1), and the water collection well (1) is divided into a first water collection well (11) on the right and a second water collection well (12) on the left by the central partition wall (13). The bottom of the water collection well on each side is fixedly installed with the submersible sewage pump foundation (5), and the submersible sewage pump (2) is fixedly installed on the top of the submersible sewage pump foundation (5). The outlet end of the submersible sewage pump (2) is connected to the inlet end of a drainage pipe (3). After the drainage pipe (3) crosses the central partition wall (13), its outlet end is located in the water collection well on the other side.

2. The sewage discharge system for a pumped storage power station's sump well according to claim 1, characterized in that, The entire underground plant's seepage and drainage are connected to the drainage corridor at the bottom of the plant; the drainage corridor is connected to the first water collection well (11) through the first buried pipe, and the drainage corridor is connected to the second water collection well (12) through the second buried pipe.

3. A sewage discharge system for a pumped storage power station's sump well according to claim 1, characterized in that, The submersible sewage pump foundation (5) is a concrete foundation. The top surface is fixedly connected to the corresponding submersible sewage pump (2) by anchor bolts (10), and the bottom surface is fixed to the bottom of the corresponding water collection well by steel bars or pre-embedded bolts.

4. A sewage discharge system for a pumped storage power station's sump well according to claim 1, characterized in that, The height of the intermediate partition wall (13) is lower than the water collection well cover plate of the water collection well (1).

5. A sewage discharge system for a pumped storage power station's sump well according to claim 1, characterized in that, Each of the water collection wells is also equipped with a sewage flushing unit; the sewage flushing unit includes a pressure wave check valve drainage pipe (4), a leakage drainage pump (6), a control valve (7), a pressure wave check valve (8), and an isolation valve (9). The leakage drainage pump (6) is installed in the well of each side of the water collection well. The outlet of the leakage drainage pump (6) is provided with the control valve (7) and connected to the leakage drainage main pipe. The branch outlet of the leakage drainage main pipe is connected in series with the isolation valve (9) and the pressure wave stop valve (8). The valve outlet of the pressure wave stop valve (8) is connected to the inlet of the pressure wave stop valve drainage pipe (4). The outlet of the pressure wave stop valve drainage pipe (4) is located around the suction port of the submersible sewage pump (2) on the same side and the foundation (5) of the submersible sewage pump.

6. A sewage discharge system for a pumped storage power station's sump well according to claim 5, characterized in that, The height of the intermediate partition wall (13) is lower than the starting water level of the seepage drainage pump (6) in the small water collection well.

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