A method for treating a leakage of water in a line outlet shaft

Abstract

The application discloses a treatment method for leakage water in a line outlet shaft, which comprises the following steps: S1, a leakage pool is arranged in the line outlet shaft, so that the leakage pool is located at the lowest position of the line outlet shaft, and the leakage pool is used for collecting the seepage water in the line outlet shaft; S2, a slant pipe is connected to the leakage pool, the other end of the slant pipe is communicated with a vertical pipe, the top of the vertical pipe is communicated with an upper pool, the bottom of the vertical pipe is provided with a lower pool, and the inclination of the slant pipe is not greater than 10%; S3, when the seepage water is collected in the leakage pool, the water in the upper pool falls into the lower pool from the vertical pipe, and the seepage water in the leakage pool is sucked into the vertical pipe by forming a negative pressure in the slant pipe, so that the air suction vortex is not generated in the upper pool; and S4, finally, the water in the lower pool is discharged. The treatment method for leakage water in the line outlet shaft provided by the application can safely and reliably discharge the leakage water by using the vacuum principle without using water pumping equipment and setting power supply.

Description

Technical Field

[0001] This invention belongs to the field of hydropower station construction technology, and specifically relates to a method for dealing with leakage water that cannot be discharged by gravity from the outlet shaft. Background Technology

[0002] Hydropower stations typically house underground powerhouses and turbine generator units within mountains, while transmission lines and 500kV outgoing line yards are built on the mountain surface, connected by outgoing line shafts. Once the reservoir reaches its normal water level, a significant portion of the outgoing line shaft will be below this level, facing challenges such as reservoir water seepage, surface rainwater runoff, and groundwater leakage. The outgoing line shaft houses 500kV GIL (Gas Infrared Array) equipment, lighting circuits, distribution boxes, and other electrical equipment, serving as a crucial conduit for external power transmission lines. Maintaining the dryness of the shaft walls is paramount to ensure the safe and stable operation of the 500kV GIL and other electrical equipment.

[0003] Seepage treatment of the shaft walls is a persistent problem in all high vertical shaft hydropower stations. Currently, the commonly used treatment measures in engineering are to install blind drainage pipes and inlet / outlet pipes. This measure is effective for treating seepage with larger flow rates, but when dealing with seepage with smaller flow rates and lower velocities, the seepage treatment effect is not ideal due to various factors such as seepage crystal precipitation clogging the pipes and excessively long inlet / outlet pipes. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for dealing with the inability of leakage water to drain from the outgoing line shaft by gravity. This method can solve the problem of leakage water in the outgoing line shaft not being able to drain by gravity, ensuring that the shaft wall is dry, thereby ensuring the safe operation of the power station and improving the environment.

[0005] The technical objective of this invention is achieved through the following technical solution: a method for treating leakage water that cannot be discharged by gravity from a vertical shaft, comprising the following steps;

[0006] S1 A seepage pool is set in the outgoing vertical shaft, and the seepage pool is located at the lowest point of the outgoing vertical shaft. The seepage pool is used to collect seepage water in the outgoing vertical shaft.

[0007] S2 connects an inclined pipe to the seepage tank, the other end of the inclined pipe is connected to a vertical pipe, the top of the vertical pipe is connected to an upper water tank, and a lower water tank is provided at the bottom of the vertical pipe. The upward slope formed by the inclined pipe is no more than 10%.

[0008] S3 When the seepage water accumulates in the seepage tank, the water in the upper water tank falls from the vertical pipe into the lower water tank. At the same time, a negative pressure is formed in the inclined pipe to draw the seepage water in the seepage tank into the vertical pipe. At this time, it is ensured that no suction vortex is generated in the upper water tank.

[0009] S4 can be pushed down into the pool by going through the last row.

[0010] Preferably, in step S2, the diameter of the inclined tube is not greater than 32% of the diameter of the vertical tube, the length of the lower end of the connection point between the vertical tube and the inclined tube is 34%-83% of the length of the vertical tube, and the horizontal projection length of the inclined tube is not greater than 3.3 times the length of the upper end of the connection point between the vertical tube and the inclined tube.

[0011] Preferably, in step S2, a control valve is connected at the connection between the inclined tube and the seepage tank.

[0012] Preferably, in step S2, the connection between the vertical tube and the inclined tube is constructed as an arc connection.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention provides a method for dealing with leakage water that cannot be discharged by gravity in the outlet shaft. It does not require the use of pumping equipment or the setting of a power supply, and safely and reliably discharges the leakage water using the vacuum principle.

[0015] 2. The present invention provides a method for treating leakage water that cannot be discharged by gravity in the outlet shaft. The process is simple and the construction is convenient. Only two water pipes and three water tanks are needed to complete the entire construction. Attached Figure Description

[0016] Figure 1 This is a layout diagram of one embodiment of the present invention.

[0017] In the diagram: 1. Leakage tank; 2. Inclined pipe; 3. Vertical pipe; 4. Upper water tank; 5. Lower water tank; 6. Control valve. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This application presents a seepage treatment process designed through multiple experiments, based on the treatment of seepage in the vertical shaft of the Baihetan Hydropower Station. (See attached document for reference.) Figure 1 As a preferred embodiment of the present invention, this embodiment provides a method for dealing with leakage water that cannot be discharged by gravity from the outlet shaft, including the following steps;

[0020] S1 A seepage pool 1 is set in the outgoing vertical shaft, so that the seepage pool 1 is located at the lowest point of the outgoing vertical shaft. The seepage pool 1 is used to collect the seepage water in the outgoing vertical shaft.

[0021] S2 connects an inclined pipe 2 to the seepage pool 1. The other end of the inclined pipe 2 is connected to a vertical pipe 3. The top of the vertical pipe 3 is connected to an upper water pool 4. A lower water pool 5 is provided at the bottom of the vertical pipe 3. The slope formed by the inclined pipe 2 tilting upward is no more than 10%.

[0022] S3 When the seepage water collects in the seepage tank 2, open the valves and other switching devices on the upper water tank 4 to let the water in the upper water tank 4 fall from the vertical pipe 3 into the lower water tank 5. At this time, a negative pressure will be formed in the inclined pipe 2 to draw the seepage water in the seepage tank 1 into the vertical pipe 3. At this time, it should be ensured that no suction vortex is generated in the upper water tank 4 to avoid the inability to form sufficient negative pressure, which will lead to the failure of water diversion.

[0023] S4 can be drained of water from the last row of pool 5.

[0024] In some preferred embodiments, in step S2, the diameter of the inclined pipe 2 is no greater than 32% of the diameter of the vertical pipe 3, the length of the lower end of the connection point between the vertical pipe 3 and the inclined pipe 2 is 34%-83% of the length of the vertical pipe 3, and the horizontal projection length of the inclined pipe 2 is no greater than 3.3 times the length of the upper end of the connection point between the vertical pipe 3 and the inclined pipe 2. The upper end of the connection point between the vertical pipe 3 and the inclined pipe 2 refers to the length of the vertical pipe above the connection point; the lower end of the connection point between the vertical pipe 3 and the inclined pipe 2 refers to the length of the vertical pipe below the connection point. In this application, because a vacuum is generated in the vertical pipe 3 and the inclined pipe 2, water in the seepage tank 1 can be effectively pumped into the vertical pipe 3 along the inclined pipe 2, and finally flow into the sewer tank 5. This method is particularly suitable for seepage scenarios with small flow rates and low velocities. In step S2, a control valve 6 is connected at the connection between the inclined pipe 2 and the seepage tank 1. Connecting the control valve 6 allows the water in the seepage tank 1 to be opened after the expected water head is formed, so that the water head in the seepage tank 1 provides a certain pressure. In this case, one end of the inclined pipe 2 forms a negative pressure and the other end has a positive pressure, which will draw the water in the seepage tank 1 into the vertical pipe 3 more quickly. In step S2, the connection between the vertical pipe 3 and the inclined pipe 2 is constructed as an arc connection, which can reduce the impact between the inclined pipe 2 and the vertical pipe 3.

[0025] In a specific application embodiment, the height of the vertical pipe 3 is 60m and the pipe diameter D1=250mm; the horizontal projection length of the inclined pipe 2 is L2=200m and the pipe diameter D2=80mm; the intersection of the axes of the vertical pipe 3 and the inclined pipe 2 is located 20.5m from the lower outlet of the vertical pipe 3, and the slope of the inclined pipe 2 is 10%; the water pressure at the two inlets at the upper end of the vertical pipe 3 and the lower end of the inclined pipe 2 is 0.5m water column, and the lower end of the vertical pipe 3 is a free outflow; the water flow velocity in the inclined pipe 2 is 0.314m / s upward.

[0026] In another specific application embodiment, in step S2, a control valve is connected at the connection between the inclined pipe and the seepage tank. In this embodiment, the height of the vertical pipe 3 is 60m and the pipe diameter D1=250mm; the horizontal projection length of the inclined pipe 2 is L2=200m and the pipe diameter D2=80mm; the intersection of the axes of the vertical pipe 3 and the inclined pipe 2 is located 30m from the outlet of the vertical pipe 1, and the slope of the inclined pipe 2 is 10%; the water pressure at the two inlets at the upper end of the vertical pipe 3 and the lower end of the inclined pipe 2 is 0.5m water column, and the lower end of the vertical pipe 3 is a free outflow; the water flow velocity in the inclined pipe 2 is 0.206m / s upward.

[0027] In another specific application embodiment, the height of the vertical pipe 3 is 60m and the pipe diameter D1=250mm; the horizontal projection length of the inclined pipe 2 is L2=200m and the pipe diameter D2=80mm; the intersection of the axes of the vertical pipe 3 and the inclined pipe 2 is located 20.5m from the outlet of the vertical pipe 1, and the slope of the inclined pipe 2 is 0.5%; the water pressure at the two inlets at the upper end of the vertical pipe 3 and the lower end of the inclined pipe 2 is 0.5m water column, and the lower end of the vertical pipe 3 is a free outflow; the water flow velocity in the inclined pipe 2 is 0.327m / s upward.

[0028] Furthermore, during repeated parameter adjustments and experiments, the inventors of this application discovered that when the connection point between the vertical pipe 3 and the inclined pipe 2 varied between 20.5m in Example 1 and 50m in Example 2, the water flow in the inclined pipe 2 consistently flowed upwards, with the flow velocity exhibiting a linear variation. When the slope of the inclined pipe 2 varied between 10%m in Example 1 and 0.5% in Example 2, the water flow in the inclined pipe 2 consistently flowed upwards; the flow velocity changed significantly when the slope was greater than 8%, and did not change significantly when the slope was less than 8%.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for treating leakage water that cannot be discharged by gravity from a vertical shaft, characterized in that, Includes the following steps: S1 A seepage pool is set in the outgoing vertical shaft, and the seepage pool is located at the lowest point of the outgoing vertical shaft. The seepage pool is used to collect seepage water in the outgoing vertical shaft. S2 connects an inclined pipe to the seepage tank, and a control valve is connected at the connection between the inclined pipe and the seepage tank. The other end of the inclined pipe is connected to a vertical pipe, the top of the vertical pipe is connected to an upper water tank, and a lower water tank is provided at the bottom of the vertical pipe. The slope formed by the inclined pipe tilting upward is not greater than 10%. The diameter of the inclined pipe is not greater than 32% of the diameter of the vertical pipe. The length of the lower end of the connection point between the vertical pipe and the inclined pipe is 34%-83% of the length of the vertical pipe, and the horizontal projection length of the inclined pipe is not greater than 3.3 times the length of the upper end of the connection point between the vertical pipe and the inclined pipe. S3 After the seepage water accumulates in the seepage tank, the control valve is opened after the expected water head is formed in the seepage tank, so that the water in the upper water tank falls from the vertical pipe into the lower water tank. At the same time, a negative pressure is formed in the inclined pipe to draw the seepage water in the seepage tank into the vertical pipe. At this time, it is ensured that no suction vortex is generated in the upper water tank. S4 can be drained of water from the last row of the pool.

2. The method for treating leakage water that cannot be discharged by gravity in a vertical shaft according to claim 1, characterized in that: In step S2, the connection between the vertical tube and the inclined tube is constructed as an arc connection.

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