Large-water-depth hydropower station water inlet fish entrapment loss prevention and control system

Abstract

A fish entrainment loss prevention and control system for a water inlet of a large-water-depth hydropower station comprises a plurality of flexible electrodes covering a certain range of water in front of the water inlet of the hydropower station, a water flow environment parameter sensor located in a water area where the flexible electrodes are arranged, a main machine arranged on a top platform of the water inlet of the hydropower station, a sub-machine and a pulse power source. The water flow environment parameter sensor and the sub-machine are connected with the host, the flexible electrode is connected with the sub-machine, and the host is used for controlling the sub-machine and the flexible electrode to generate a semi-random direct-current pulse electric field in front of a water inlet of a power station. The water inlet fish entrainment loss prevention and control system can be suitable for large-water-depth and high-water-level variable-amplitude hydropower stations, can be intelligently coordinated with reservoir operation scheduling, and has important application value.

Description

Technical Field

[0001] The utility model relates to the field of water ecological protection, and specifically refers to a fish loading loss prevention and control system for a water inlet of a large deep water power station. Background Art

[0002] Hydropower stations can generate green electricity, but during the power generation process, due to the carrying effect of the water flow, fish may enter the water inlet of the power station and be damaged by the water flow and turbine units, causing loss of fish resources and creating certain ecological problems.

[0003] Various means such as sound, light, and electricity are used to prevent and control fish entrainment losses, but there are problems such as being easily damaged by water flow, not applicable to deep water bodies, inaccurate control of operating parameters, poor prevention and control effects, and easy damage to fish. In the face of water ecological protection work in the basin, it is still necessary to solve the bottleneck problem of fish resource loss caused by the entrainment effect at the water inlet of the hydropower station. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the background technology and provide a fish rolling loss prevention and control system for the water inlet of a large deep-water power station. Through system control, a semi-random DC pulse electric field is generated in front of the water inlet of the power station, which has a lower learning and adaptation effect on fish, thereby improving the prevention and control effect of fish rolling loss.

[0005] A fish-carrying loss prevention and control system for a water inlet of a deep-water hydropower station comprises a plurality of flexible electrodes covering a certain range of water bodies in front of the water inlet of the power station, a water flow environment parameter sensor located in the water area where the flexible electrodes are arranged, a main machine, a sub-machine and a pulse power supply arranged on a top platform of the water inlet of the power station, the water flow environment parameter sensor and the sub-machine being connected to the main machine, the flexible electrode being connected to the sub-machine, and the main machine being used to control the sub-machine and the flexible electrode to generate a semi-random DC pulse electric field in front of the water inlet of the power station.

[0006] Furthermore, the bottom of the flexible electrode is fixed to the bottom anchor via an insulating nylon pulley, the anchor is locked on the sand-trapping platform with chemical bolts, the top of the flexible electrode is turned via an insulating nylon pulley, and is fixed to the top anchor by a basket bolt, the top anchor adjusts the tightness of the flexible electrode within a range of 10 cm, and the top anchor is locked on the trash rack platform at the top of the water inlet of the hydropower station with chemical bolts.

[0007] Furthermore, it also includes a cable drum arranged on the trash rack platform. The top of the part of the flexible electrode is turned through an insulating nylon pulley and then fixed to the top fixing part through the cable drum. When the cable drum is released, the flexible electrode naturally hangs underwater, making it convenient for the work boat to enter the water area in front of the water inlet of the power station for operation.

[0008] Furthermore, the water flow environment parameter sensor includes a water temperature sensor and a conductivity sensor.

[0009] The utility model has the following beneficial effects:

[0010] Fixed flexible electrodes are used to generate a DC pulse electric field in the water. They have high structural strength, are suitable for large water depths, have flexible arrangements, are simple to maintain, and have reliable effects. The flexible electrodes can be retracted and deployed according to actual needs, making it convenient for working vessels to enter the waters surrounded by the flexible electrodes during daily management of the power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a fish-carrying loss prevention and control system for a water inlet of a large deep-water power station according to an embodiment of the utility model;

[0012] Figure 2 This is a schematic diagram of the arrangement of the flexible electrode at the water inlet of a hydropower station according to an embodiment of the utility model;

[0013] Figure 3 This is a schematic diagram of the bottom fixing method of the flexible electrode of the utility model;

[0014] Figure 4 This is a schematic diagram of the top fixing method of the flexible electrode of the utility model.

[0015] In the figure: 1-power station water inlet, 2-water flow environment parameter sensor, 3-flexible electrode, 4-connecting cable, 5-main unit, 6-sub-unit, 7-pulse power supply, 8-bottom anchor, 9-top anchor, 10-cable drum, 19-sand barrier platform, 20-trash rack platform, 21-nylon pulley, 22-basket bolt, 23-rope clamp. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-4The embodiment of the utility model provides a fish-carrying loss prevention and control system for the water inlet of a large-water deep hydropower station, including a plurality of flexible electrodes 3 covering a certain range of water bodies in front of the water inlet of the power station, a water flow environment parameter sensor 2 located in the water area where the flexible electrodes 3 are arranged, a main unit 5, a sub-unit 6 and a pulse power supply 7 arranged on the top platform of the water inlet of the power station, the water flow environment parameter sensor 2 and the sub-unit 6 are respectively connected to the main unit 5, the flexible electrode 3 is connected to the sub-unit 6, and the water flow environment parameter sensor 2 can be a water temperature sensor, a conductivity sensor, etc. The flexible electrode 3 can be made of conductive materials such as stainless steel and iron, considering different arrangement parameters such as diameters and spacings.

[0018] In the specific implementation, the velocity distribution of water flow near the water inlet 1 of the power station is first predicted, and the water area with a velocity less than 1.0m / s is selected to design and arrange the flexible electrode 3 according to local conditions. The diameter and arrangement spacing of the flexible electrode 3 are determined according to the results of the water tank test. Specifically, the diameter of the flexible electrode 3 in this embodiment is designed to be 8mm, and the arrangement spacing is 1.5m-2m. It covers a certain range of water in front of the water inlet 1 of the power station in an oblique manner (such as Figure 2 shown).

[0019] like Figure 3 As shown, the bottom anchor 8 is fixed to the sand retaining platform 19 at the front of the power station water inlet 1 by chemical bolts, the insulating nylon pulley 21 is connected to the bottom anchor 8 by a stainless steel pin, and the flexible electrode 3 bypasses the nylon pulley 21 and is connected and fixed to the bottom anchor 8 by a stainless steel rope clamp 23.

[0020] like Figure 4 As shown, the front and rear two stainless steel top anchors 9 are fixed to the trash rack platform 20 at the top of the power station water inlet 1 by chemical bolts, and the front top anchor 9 is connected to the insulating nylon pulley 21 by a stainless steel pin shaft, which plays the role of steering the flexible electrode 3. The rear top anchor 9 is connected to the stainless steel basket bolt 22 by a stainless steel pin shaft, and the flexible electrode 3 is connected to the stainless steel basket bolt 22 by a stainless steel rope clamp 23. After the top of part of the flexible electrode 3 is turned by the insulating nylon pulley 21, it can be fixed to the top anchor 9 by the cable drum 10. When the cable drum 10 is released, the flexible electrode 3 naturally hangs underwater, which is convenient for the workboat to enter the water area in front of the power station water inlet 1 for operation.

[0021] Working principle of the utility model: the host 5 receives the operation data of the hydropower station such as the incoming flow rate and water level, arranges the water area flow velocity data based on the predicted flexible electrode 3, and receives the water environment parameter data such as water temperature and conductivity monitored in real time by the water environment parameter sensor 2, and generates the basic output parameters of the pulse power supply. Each sub-machine 6 receives the basic instruction of the basic parameters of the pulse power supply issued by the host 5, sets a certain pulse period and pulse amplitude variation range on this basic instruction, and forms a semi-random power output instruction to the pulse power supply 7. The pulse power supply 7 generates the actual output value of the pulse DC power supply parameter, and generates a semi-random DC pulse electric field in front of the water inlet of the power station through the sub-machine 6 and the flexible electrode 3, so as to realize the prevention and control of fish rolling losses while avoiding the adaptation of the fish learning effect to the fixed electric field.

[0022] This embodiment is adapted to local conditions, and a flexible electrode covering the water inlet of the power station is arranged in an oblique manner, which is suitable for deep water operation environments; using a water tank test, the host controls the sub-machine 6 and the flexible electrode 3 to generate a DC pulse electric field, realizing real-time coordination between fish loading loss prevention and control and reservoir operation scheduling, reducing the learning and adaptation effects of fish to the same electric field, and making the system operation more economical and efficient. According to the water tank test and on-site monitoring, domestic fish of different sizes can produce return escape behavior within a range of 1-3m from the flexible electrode, effectively realizing the prevention and control of more than 95% of fish loading losses without causing damage to the fish.

[0023] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by technicians in this technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A system for preventing and controlling fish loading losses at the water inlet of a large deep-water power station, characterized in that: The invention comprises a plurality of flexible electrodes covering a certain range of water bodies in front of the water inlet of a power station, a water flow environment parameter sensor located in the water area where the flexible electrodes are arranged, a main unit, a sub-unit and a pulse power supply arranged on the top platform of the water inlet of the power station, the water flow environment parameter sensor and the sub-unit are connected to the main unit, and the flexible electrodes are connected to the sub-unit, and the main unit is used to control the sub-unit and the flexible electrodes to generate a semi-random DC pulse electric field in front of the water inlet of the power station.

2. A system for preventing and controlling fish loading losses at the water inlet of a large deepwater power station as claimed in claim 1, characterized in that: The bottom of the flexible electrode is fixed to the bottom anchor via an insulating nylon pulley, and the anchor is locked on the sand barrier platform with chemical bolts. The top of the flexible electrode is turned via an insulating nylon pulley and fixed to the top anchor by a basket bolt. The top anchor can adjust the tightness of the flexible electrode within a range of 10 cm, and the top anchor is locked on the trash rack platform at the top of the water inlet of the hydropower station with chemical bolts.

3. A system for preventing and controlling fish loading losses at the water inlet of a large deepwater power station as claimed in claim 1, characterized in that: It also includes a cable drum arranged on the trash rack platform. The top of a part of the flexible electrode is turned via an insulating nylon pulley and then fixed to the top fixing piece through the cable drum.

4. A system for preventing and controlling fish loading losses at the water inlet of a large deepwater power station as claimed in claim 1, characterized in that: The water flow environment parameter sensor includes a water temperature sensor and a conductivity sensor.

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