Method for improving operation efficiency of ship lift approach channel auxiliary lock chamber

Abstract

The invention discloses a method for improving the operation efficiency of a ship lift approach channel auxiliary lock chamber, and belongs to the technical field of approach channel hydraulics. The method comprises the following steps that S1, a water level gauge is arranged in a key area in a ship lift approach channel; s2, reading a non-constant-current water level fluctuation value H in a key area in the storage approach channel in real time; s3, calculating the fluctuation amplitude of the non-constant current water level in the key area in the approach channel of the ship lift hour by hour; and S4, comparing operation scheduling limits of the ship lift, and determining whether the auxiliary lock chamber needs to be put into operation or not. According to the method for improving the operation efficiency of the auxiliary lock chamber of the ship lift approach channel, the problems that in the prior art, frequent operation of the auxiliary lock chamber consumes long time, the navigation efficiency is greatly influenced, and the metal structure of a fixed roll type hoist is greatly shortened due to repeated use of an auxiliary lock head working door can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of pilot channel hydraulics technology. Specifically, it relates to a method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel. Background Technology

[0002] A ship lift is a large mechanical device used to raise and lower ships, enabling them to overcome concentrated water level differences in waterways (such as dams). During the passage of ships through a ship lift, drastic changes in the flow pattern within the downstream approach channel should be avoided to ensure safe entry and exit. Generally, it is stipulated that the water level difference between the ship lift and the downstream approach channel must be kept small (usually within 0.1m) during the docking process; otherwise, docking may fail. If the water level fluctuation in the downstream approach channel reaches or exceeds a certain value within 20 minutes, docking must be stopped to ensure safety. To meet power generation needs, some hydropower stations may perform peak shaving or switching operations during operation according to grid dispatch requirements, resulting in changes in downstream flow. This inevitably creates unsteady flow phenomena in the downstream river channel and approach channel, causing fluctuations in river and approach channel water levels. Due to the complex sources of unsteady currents in the approach channel, it is difficult to accurately predict the magnitude of unsteady current fluctuations under various conditions, making it difficult to guide the operation of the ship lift. While an auxiliary lock chamber downstream of the ship lift can alleviate these problems to some extent, it needs to be activated when the discharge flow changes. However, frequent activation of the auxiliary lock chamber is not only time-consuming and significantly impacts navigation efficiency, but the repeated use of the auxiliary lock's working gate also greatly shortens the lifespan of the fixed-winding hoist's metal structure. Therefore, a method to improve the operational efficiency of the auxiliary lock chamber in the ship lift approach channel, without affecting the complexity and efficiency of ship lift operation, is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to provide a method for improving the operating efficiency of the auxiliary lock chamber in a ship lift pilotway, addressing the aforementioned shortcomings. This method solves problems in existing technologies, such as the long operating time and significant impact on navigation efficiency caused by frequent commissioning of the auxiliary lock chamber, and the substantial reduction in the length of the fixed-winding hoist's metal structure due to repeated use of the auxiliary lock's working gate. To achieve the above objective, this invention provides the following technical solution: A method for improving the operating efficiency of the auxiliary lock chamber in a ship lift pilot channel includes the following steps: S1. Install water level gauges in key areas within the ship lift's navigation channel to measure water level changes in these key areas; S2. Real-time reading of non-constant flow water level fluctuation value H in key areas within the navigation channel stored here; S3. Calculate the amplitude of non-constant flow water level fluctuations in key areas within the ship lift's approach channel hourly to obtain the water level variation ΔH over time intervals, i.e., ΔH = current water level fluctuation value (H). t1 - Water level fluctuation value before the interval (H) t0 ); S4. Compare the ship lift's operational scheduling restrictions to determine whether the auxiliary lock chamber needs to be put into operation. The ship lift's operational scheduling restrictions require that when the water level fluctuation in the downstream approach channel reaches or exceeds the value Δh within an interval, docking must be stopped to ensure safety. By comparing the real-time calculated ΔH and Δh, the operational risk of the ship lift is assessed, and it is determined whether the auxiliary lock chamber needs to be put into operation.

[0004] Furthermore, the key areas within the ship lift pilot channel in step S1 include the docking area of ​​the lower gate of the ship lift and the berthing pier of the pilot channel.

[0005] Furthermore, in step S1, the water level gauge is one or more of an automatic tracking water level gauge, a water level sensor, an ultrasonic water level gauge, and a radar water level gauge.

[0006] Furthermore, the non-constant flow water level fluctuation value H data in step S2 can be transmitted to the server in real time, and the data transmission adopts on-site wireless networking or wireless network technology.

[0007] Furthermore, in step S3, the water level fluctuation amplitude ΔH satisfies the minimum time interval not exceeding 5 seconds.

[0008] Furthermore, the interval in step S3 is ten minutes, i.e., ΔH = current water level fluctuation value H. t1 - Water level fluctuation value H ten minutes ago t0 .

[0009] Furthermore, in step S4, the ship lift operation scheduling restriction requirement is that when the water level fluctuation in the downstream pilot channel reaches or exceeds 0.2 meters within ten minutes.

[0010] Furthermore, in step S4, when the water level fluctuation ΔH ≥ Δh is 0.2m at 10-minute intervals, the auxiliary gate chamber is put into operation.

[0011] Furthermore, the water level changes are consistent in key areas within the ship lift's navigation channel.

[0012] Furthermore, in step S3, the water level fluctuation ΔH within the interval is obtained based on the data from any water level gauge deployed in the key area.

[0013] The beneficial effects of this invention are: This invention discloses a method for improving the operating efficiency of the auxiliary lock chamber in the approach channel of a ship lift. First, water level gauges are installed in key areas within the approach channel to read and store the non-constant flow water level fluctuation value H in real time. The amplitude of the non-constant flow water level fluctuation in the approach channel is calculated hourly and compared with the ship lift's operation scheduling restrictions to determine whether the auxiliary lock chamber needs to be put into operation. This method can improve the passage efficiency of the ship lift and has good engineering application value. Furthermore, without affecting the complexity and efficiency of the ship lift's operation, it reduces the frequency of the auxiliary lock chamber's operation and greatly extends its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the layout of water level measuring points in the navigation channel according to the present invention; Figure 2 This is a flowchart illustrating an embodiment of the present invention; Figure 3 This is a schematic diagram of the real-time water level and water level fluctuation in an embodiment of the present invention; Detailed Implementation The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0015] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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 invention.

[0016] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0017] In the description of this invention, "a plurality of" means two or more.

[0018] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0019] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0020] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] Example See attached Figures 1-3 This embodiment discloses a method for improving the operational efficiency of the auxiliary lock chamber in a ship lift approach channel. It is applied to the approach channel of a ship lift at a large hydropower station. The ship lift is a vertical ship lift, with a natural waterway downstream and adjacent to the hydropower station's spillway dam and power plants on both banks upstream. Three berthing piers (numbered 1#-3#) are installed within the approach channel, and the lower lock head is the core area for docking ships with the ship-carrying chamber. Due to grid peak shaving and unit maintenance requirements, the hydropower station experiences frequent fluctuations in discharge flow, resulting in significant non-steady flow phenomena within the approach channel. Water level fluctuations have a prominent impact on the safety of ship lift docking and navigation efficiency. An auxiliary lock chamber has already been constructed in the downstream approach channel. Therefore, this embodiment is proposed to improve the operational efficiency of the auxiliary lock chamber in the ship lift approach channel. The method includes the following steps: Step S1: Layout of water level gauges in key areas of the pilot channel. Key areas within the pilot channel include the docking area at the lower lock of the ship lift and the berthing area of ​​the pilot channel. Specifically, the docking area at the lower lock of the ship lift is the critical working surface for docking the vessel with the berthing chamber; water level stability directly determines docking accuracy and safety. In the berthing area, the water area corresponding to berthing pier #2 is selected as a supplementary measuring point. Water level gauges will be selected from one or more of the following: automatic tracking water level gauges, water level sensors, ultrasonic water level gauges, and radar water level gauges. The appropriate gauge will be selected based on the actual environment of the pilot channel. Each water level gauge will be used at a different location, or multiple gauges can be set at the same measuring point, and the average value of the data can be taken. The water level gauges must be aligned with the water surface and must avoid obstruction or collision caused by ship navigation and wave impact. After all water level gauges are installed, on-site calibration will be performed using existing calibration methods to ensure that the error is within the required range.

[0022] Step S2: Real-time Acquisition and Storage of Non-Constant Flow Water Level Fluctuations. The non-constant flow water level fluctuation values ​​H within the key area of ​​the navigation channel are read and stored in real time. The data acquisition interval is set to 5 seconds. The acquired data includes: water level value and acquisition timestamp. Data transmission adopts on-site wireless networking or wireless network technology. On-site wireless networking can use the existing LoRa wireless communication protocol to communicate with the on-site base station. The LoRa protocol has the characteristics of low power consumption, long distance, and strong anti-interference ability, making it suitable for complex field environments. The data is transmitted to the server in the ship lift control center, where the ship lift early warning and forecasting system analyzes the data.

[0023] Step S3: Calculation of water level fluctuation amplitude. Calculate the non-constant flow water level fluctuation amplitude ΔH in key areas within the ship lift pilot channel every hour, with the interval set at 10 minutes. The calculation formula is: ΔH = current water level fluctuation value (H... t1 - Water level fluctuation value 10 minutes ago (H) t0 ), where H t1 H represents the water level value corresponding to the current data collection time t1. t0 The water level value corresponding to t0 = t1 - 10 minutes is given. After calculating ΔH, its rationality is verified. The water level parameters and the effectively calculated water level fluctuation ΔH values ​​are compiled into a data table, as follows: Figure 3 As shown, this allows for a direct and intuitive comparison of water level changes and their trends. The water level changes are consistent across key areas within the ship lift's navigation channel, and the water level variation ΔH over time intervals can be obtained from data from any water level gauge positioned within the key area. Multiple monitoring points prevent ineffective measurement due to data failure at any single monitoring point, thus improving the feasibility of this embodiment.

[0024] Step S4: Operational Scheduling Limit Comparison and Auxiliary Lock Chamber Control. The ship lift's operational scheduling limits are as follows: when the water level fluctuation in the downstream approach channel reaches or exceeds Δh=0.2m within 10 minutes, docking must be stopped to ensure safety. The ship lift's early warning and forecasting system can read the ΔH value in real time and compare it with the safety threshold Δh=0.2m. When ΔH ≥ 0.2m is detected at a certain measuring point, it is determined to be outside the safe range, triggering an early warning, and the auxiliary lock chamber is put into operation; when ΔH < 0.2m, it is determined that the water level fluctuation is within the safe range, no early warning is triggered, the auxiliary lock chamber remains closed, and the ship lift operates normally. Specifically, the detection time is when the water level fluctuation ΔH ≥ Δh=0.2m at 10-minute intervals, the auxiliary lock chamber is put into operation. The server connects to the existing ship lift scheduling system. When an early warning is triggered, the system first sends a signal to the ship lift scheduling system to suspend the current ship docking operation, stop the movement of the ship-carrying chamber, and maintain its current position. The system automatically sends a start command to the gate hoist control system of the auxiliary gate chamber, putting the auxiliary gate chamber into operation. Meanwhile, in case of automatic control failures, manual control can be performed by maintenance personnel.

[0025] In this embodiment, the water level data and the water level fluctuation ΔH data are as follows: Figure 3 As shown, statistical analysis of the water level fluctuation data revealed that there were two periods during both the gradual rise and fall of the water level where the fluctuation exceeded 0.2m. It is recommended to put the auxiliary lock chamber into operation to ensure the safe operation of the ship lift.

[0026] 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 present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A method for improving the operating efficiency of the auxiliary lock chamber in the pilot channel of a ship lift, characterized in that: Includes the following steps: S1. Install water level gauges in key areas within the ship lift's navigation channel to measure water level changes in these key areas; S2. Real-time reading of non-constant flow water level fluctuation value H in key areas within the navigation channel stored here; S3. Calculate the amplitude of non-constant flow water level fluctuations in key areas within the ship lift's approach channel hourly to obtain the water level variation ΔH over time intervals, i.e., ΔH = current water level fluctuation value (H). t1 - Water level fluctuation value before the interval (H) t0 ); S4. Compare the ship lift's operational scheduling restrictions to determine whether the auxiliary lock chamber needs to be put into operation. The ship lift's operational scheduling restrictions require that when the water level fluctuation in the downstream approach channel reaches or exceeds the value Δh within an interval, docking must be stopped to ensure safety. By comparing the real-time calculated ΔH and Δh, the operational risk of the ship lift is assessed, and it is determined whether the auxiliary lock chamber needs to be put into operation.

2. The method for improving the operating efficiency of the auxiliary lock chamber of the ship lift pilot channel according to claim 1, characterized in that: The key areas within the ship lift's approach channel in step S1 include the docking area of ​​the ship lift's lower gate and the approach channel's berthing piers.

3. The method for improving the operating efficiency of the auxiliary lock chamber of the ship lift pilot channel according to claim 1, characterized in that: In step S1, the water level gauge is one or more of the following: an automatic tracking water level gauge, a water level sensor, an ultrasonic water level gauge, and a radar water level gauge.

4. The method for improving the operating efficiency of the auxiliary lock chamber of the ship lift pilot channel according to claim 1, characterized in that: The non-constant flow water level fluctuation value H data in step S2 can be transmitted to the server in real time, and the data transmission adopts on-site wireless networking or wireless network technology.

5. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 1, characterized in that: In step S3, the water level fluctuation amplitude ΔH satisfies the minimum time interval of no more than 5 seconds.

6. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 1, characterized in that: The interval in step S3 is ten minutes, i.e., ΔH = current water level fluctuation value H. t1 - Water level fluctuation value H ten minutes ago t0 .

7. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 6, characterized in that: In step S4, the operation and scheduling restriction requirement for the ship lift is that when the water level fluctuation in the downstream navigation channel reaches or exceeds 0.2 meters within ten minutes.

8. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 7, characterized in that: In step S4, when the water level fluctuation ΔH ≥ Δh is 0.2m at 10-minute intervals, the auxiliary gate chamber is put into operation.

9. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 1, characterized in that: The water level changes consistently in key areas within the ship lift's navigation channel.

10. A method for improving the operating efficiency of the auxiliary lock chamber of a ship lift pilot channel according to claim 8, characterized in that: In step S3, the water level fluctuation ΔH within the interval is obtained based on the data from any water level gauge deployed in the key area.

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