Synergistic power generation system and method for water supply pipeline of hydraulic turbine set

Abstract

The invention relates to the technical field of hydroelectric generation, in particular to a water turbine set water supply pipeline synergistic power generation system and method.By additionally arranging a power generation unit in a technical water supply pipe, technical water supply of a water turbine set is fully utilized, the resource utilization rate is increased, meanwhile, the power generation amount is increased, the power generation synergistic requirement is met, and economic benefits are increased; the power generation unit is of a modular structure and can be conveniently matched and installed with a technical water supply pipe according to requirements, meanwhile, the power generation unit is used for installing an optimization unit, the number of power generation units in the technical water supply pipe is determined, the influence on technical water supply is reduced, and normal work of a turboset is guaranteed. The power generation start-stop control unit actively performs start-stop control on the power generation unit, so that idle running or reverse rotation of the power generation unit can be avoided, equipment loss is reduced, the service life is prolonged, power generation safety and reliability are guaranteed, and actual power generation requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower generation, and particularly relates to a water turbine unit water supply pipeline efficiency improvement power generation system and method. Background Art

[0002] With the continuous growth of energy demand, it is of great significance to improve the power generation efficiency and economic benefits of hydropower stations.

[0003] The technical water supply of a hydropower station refers to the water required for various bearing coolers, air coolers, and main shaft seals of a water turbine generator unit. During the operation of the water turbine unit, a technical water supply system is required for cooling and lubrication (such as the rubber tile guide bearing of a water turbine). The technical water supply system operates to supply water before the water turbine starts and stops supplying water after the water turbine unit shuts down. During the period when the water turbine unit is not operating, the technical water supply is not fully utilized, resulting in waste of energy, increasing the power generation cost of the water turbine, and not meeting the efficiency improvement requirements. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems described in the background art, and thus provides a water turbine unit water supply pipeline efficiency improvement power generation system and method.

[0005] The solution of the present invention to the above technical problems is as follows: A water turbine unit water supply pipeline efficiency improvement power generation system, comprising: A technical water supply pipe for supplying water to a water turbine unit; A power generation unit disposed inside the technical water supply pipe for generating electricity through the water flow in the technical water supply pipe; A power generation start-stop control unit, signal-connected to the power generation unit, for controlling the start and stop of the power generation unit according to the water flow state in the technical water supply pipe; A power generation unit installation optimization unit for determining the installation state of the power generation unit in the technical water supply pipe according to the water flow state in the technical water supply pipe; A power generation acquisition unit, electrically connected to the power generation unit, for acquiring the power generation of the power generation unit.

[0006] Further defined, the power generation unit includes a connecting sleeve and a small water turbine, a coupling, and a generator connected in sequence. The small water turbine faces the water inlet end of the technical water supply pipe. The small water turbine, the coupling, and the generator are all disposed inside the connecting sleeve, and the connecting sleeve is coaxially disposed with the technical water supply pipe; The connecting sleeve is connected to the technical water supply pipe through a connecting flange, and the small water turbine is signal-connected to the power generation unit start-stop control unit.

[0007] Further defined, a maintenance window is provided on the connecting sleeve; The inner diameter of the connecting sleeve is the same as that of the technical water supply pipe. The distance S between the power generation unit and the water outlet end of the technical water supply pipe satisfies 5D ≤ S ≤ 8D, where D is the inner diameter of the technical water supply pipe.

[0008] Further defined, the angle between the blades of the small water turbine and the water flow direction is 15°, and the coupling is a magnetic coupling.

[0009] Further defined, the start-stop control unit of the power generation unit includes a flow meter, a pressure sensor, and a start-stop controller. The flow meter and the pressure sensor are both installed in the connecting sleeve. The flow meter and the pressure sensor are both signal-connected to the start-stop controller, and the start-stop controller is signal-connected to the small water turbine; The flow meter is used to collect the water flow rate Q at the corresponding position in the technical water supply pipe, and the pressure sensor is used to collect the pressure P at the corresponding position in the technical water supply pipe; The start-stop controller is used to send a start signal when the water flow rate is greater than the rated flow rate and the pressure fluctuation per unit time does not exceed 10%; otherwise, send a stop signal; The small water turbine brakes when it receives the stop signal and cancels the brake when it receives the start signal.

[0010] Further defined, the start-stop controller is also used to obtain the working state of the water turbine unit; When the water turbine unit makes an emergency stop, the start-stop controller sends a stop signal.

[0011] Further defined, the installation optimization unit of the power generation unit includes an installation quantity calculation module, and the installation quantity calculation module is used to calculate according to to obtain the maximum allowable installation quantity of the power generation unit in the technical water supply pipe N max ; where, ΔP 允许 is the pressure difference of the water flow allowed in the technical water supply pipe, K is the friction coefficient of the technical water supply pipe, and L is the equivalent length.

[0012] Further defined, the installation optimization unit of the power generation unit also includes an installation position processing module, which is used to determine the installation height of the small water turbine in the technical water supply pipe according to where H is the head height of the small water turbine, ΔP H opt is the pressure difference between the water flows on both sides of the small water turbine, g is the acceleration due to gravity, v is the flow velocity of the water in the technical water supply pipe, 管 and is the density of the water flow. ρ is the density of the water flow.

[0013] Further defined, the power generation acquisition unit includes a power generation statistics module and an energy storage module; The power generation statistics module is electrically connected to the generator through the energy storage module; The power generation statistics module passes through and calculates the power generation of the generator W 辅 , where η is the power generation efficiency of the generator, H 净 is the net head of the small water turbine.

[0014] A method for enhancing power generation in the water supply pipeline of a water turbine unit, based on the above-mentioned water turbine unit water supply pipeline power generation enhancement system, includes the following steps: S1. Obtain the water flow state in the technical water supply pipe; S2. Determine the number of power generation units in the technical water supply pipe according to the water flow state in the technical water supply pipe; S3. Set the corresponding number of power generation units inside the technical water supply pipe; S4. Control the start and stop of the power generation unit according to the water flow state in the technical water supply pipe; S5. The power generation unit uses the water flow in the technical water supply pipe to generate power; S6. Collect the power generation of the power generation unit.

[0015] The beneficial effects of the present invention are as follows: By adding power generation units to the technical water supply pipe in the present invention, the technical water supply of the water turbine unit is fully utilized, while improving the resource utilization rate, increasing the power generation, meeting the power generation enhancement requirements, and increasing economic benefits; the power generation unit adopts a modular structure, which is convenient for cooperative installation with the technical water supply pipe according to requirements. At the same time, the power generation unit installation optimization unit is used to determine the number of power generation units in the technical water supply pipe, reducing the impact on the technical water supply and ensuring the normal operation of the steam turbine unit; through the power generation start-stop control unit actively controlling the start and stop of the power generation unit, it is possible to avoid the idling or reverse rotation of the power generation unit, reduce equipment loss, improve the service life, and ensure safe and reliable power generation, meeting the actual power generation requirements. Description of the Drawings

[0016] Figure 1 is the structure diagram of the water turbine unit water supply pipeline power generation enhancement system of the present invention; Figure 2 is the method step diagram of the water turbine unit water supply pipeline power generation enhancement method of the present invention; In the figure, 100 - technical water supply pipe; 200 - power generation unit; 201 - connecting sleeve; 202 - connecting flange; 210 - small water turbine; 220 - coupling; 230 - generator; 300 - power generation start - stop control unit; 310 - flowmeter; 320 - pressure sensor; 330 - start - stop controller; 400 - power generation unit installation optimization unit; 410 - installation quantity calculation module; 420 - installation position processing module; 500 - power generation acquisition unit; 510 - energy storage module; 520 - power generation statistics module; 600 - water turbine unit. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1 Reference Figure 1 , the present invention provides a water turbine unit water supply pipeline efficiency - increasing power generation system, including a technical water supply pipe 100 for supplying water to the water turbine unit 600; A power generation unit 200 is arranged inside the technical water supply pipe 100 and is used for generating electricity through the water flow in the technical water supply pipe 100; A power generation start - stop control unit 300 is signal - connected to the power generation unit 200 and is used for controlling the start and stop of the power generation unit 200 according to the water flow state in the technical water supply pipe 100; A power generation unit installation optimization unit 400 is used for determining the number of power generation units 200 in the technical water supply pipe 100 according to the water flow state in the technical water supply pipe 100; A power generation acquisition unit 500 is electrically connected to the power generation unit 200 and is used for collecting the power generation of the power generation unit 200.

[0019] Specifically, the power generation unit 200 is installed inside the technical water supply pipe 100. When the technical water supply pipe 100 provides cooling or lubrication for the water turbine unit 600, the water flow impacts the power generation unit 200 inside the technical water supply pipe 100 to generate electricity; preferably, the power generation unit 200 is arranged in the straight pipe section of the technical water supply pipe 100, and further preferably, the power generation unit 200 is arranged downstream of the technical water supply pipe 100, that is, near the water outlet end connecting to the water turbine unit 600.

[0020] Among them, too many power generation units 200 will cause an increase in the water flow pressure drop inside the technical water supply pipe 100, affecting the function of the water turbine unit 600; while too few power generation units 200 will reduce the utilization rate of technical water. Therefore, it is necessary to determine the number of power generation units 200 inside the technical water supply pipe 100 through the power generation unit installation optimization unit; usually, the number of power generation units 200 is multiple.

[0021] Preferably, multiple power generation units 200 are arranged in sequence along the axial direction of the technical water supply pipe 100; among them, the distance S between the power generation unit 200 close to the water outlet end of the technical water supply pipe 100 and the water outlet end of the technical water supply pipe 100 satisfies 5D ≤ S ≤ 8D, where D is the inner diameter of the technical water supply pipe 100, to avoid vortex interference.

[0022] Furthermore, the power generation unit 200 includes a connecting sleeve 201, connecting flanges 202, a small water turbine 210, a coupling 220, and a generator 230; among them, the number of connecting flanges 202 is two, and the two connecting flanges 202 are arranged on opposite sides of the connecting sleeve 201. The small water turbine 210, the coupling 220, and the generator 230 are connected in sequence. The outer wall of the water inlet end of the small water turbine 210 is connected to the facing connecting flange 202, and the fixed end of the generator 230 is connected to the facing connecting flange 202, so that it can remain stable during operation.

[0023] The connecting sleeve 201 is connected to the end of the technical water pipe 100 through the corresponding connecting flange 202, and the connecting sleeve 201 is coaxially arranged with the technical water pipe 100; the power generation unit 200 is pre-installed and used as a whole. After removing the local pipe at the corresponding position of the technical water pipe 100 during use, it is connected to the power generation unit 200, reducing the installation difficulty and improving the work efficiency; preferably, a maintenance window is opened on the connecting sleeve 201, and the maintenance window is communicated with the inside of the connecting sleeve 201, which is more convenient during maintenance and repair, reduces the work difficulty, reduces the workload, and further improves the maintenance and repair efficiency.

[0024] The small water turbine 210 faces the water inlet end of the technical water supply pipe 100. The flow of technical water drives the small water turbine 210 to rotate. The input end of the coupling 220 drives the generator 230 to rotate under the drive of the small water turbine 210, thereby realizing power generation; the generator 230 is preferably a brushless DC motor to improve the energy conversion rate; the coupling 220 is preferably a magnetic coupling, canceling the traditional gearbox, reducing mechanical wear and maintenance requirements.

[0025] The included angle between the blades in the small water turbine 210 and the flow direction of the technical water is 15°. By optimizing the angle of the blades, the capture of energy can be improved, and at the same time, the interference of the blades on the flow of technical water can be reduced, ensuring the reliable operation of the water turbine unit 600.

[0026] The small water turbine 210 is signal-connected to the start-stop control unit 300 of the power generation unit, and is used to perform braking or cancel braking according to the control signal of the start-stop control unit 300 of the power generation unit; the generator 230 is electrically connected to the power generation acquisition unit 500.

[0027] Further explanation, the start-stop control unit 300 of the power generation unit includes a flow meter 310, a pressure sensor 320 and a start-stop controller 330; among them, both the flow meter 310 and the pressure sensor 320 are used to collect data inside the technical water supply pipe 100, so they can be selectively arranged inside the technical water supply pipe 100; preferably, for the convenience of installation, both the flow meter 310 and the pressure sensor 320 are pre-installed in the connecting sleeve 201, which can conveniently detect the flow rate Q and pressure P of the technical water at the position of the power generation unit 200. Therefore, the start-stop control unit 300 of the power generation unit includes multiple flow meters 310 and multiple pressure sensors 320.

[0028] The small water turbine 210, multiple flow meters 310 and multiple pressure sensors 320 are all signal-connected to the start-stop controller 330. The start-stop controller 330 is located outside the technical water supply pipe 100. By setting the rated flow rate of the rotation of the small water turbine 210, the start-stop controller 330 judges whether the flow rate of the technical water in the current technical water pipe 100 reaches the rated flow rate. If not, it sends a stop signal. If so, it judges whether the pressure fluctuation in the technical water supply pipe 100 exceeds 10%. If so, it sends a stop signal. If not, it sends a start signal.

[0029] When the small water turbine 210 receives the stop signal, it uses the braking mechanism to lock the water turbine 210 to prevent it from rotating under the action of water flow. The purpose is to prevent the small water turbine 210 from idling or having low rotational working efficiency when there is no technical water flow or the technical water flow is small, increasing mechanical wear. Therefore, the rotation of the small water turbine 210 is controlled to stop; at the same time, when the technical water fluctuates greatly, the rotation of the small water turbine 210 is unstable. In order to ensure the service life of the small water turbine 210, the rotation of the small water turbine 210 is actively controlled to stop.

[0030] When the technical water is stable, the braking of the small water turbine 210 is cancelled, and the small water turbine 210 rotates under the action of the technical water to complete the start of the small water turbine 210.

[0031] Preferably, the start-stop controller 330 is also signal-connected to the water turbine unit 600 to obtain the working state of the water turbine unit 600. When it obtains that the water turbine unit 600 makes an emergency stop, the start-stop controller 330 will send a stop signal at this time; because when the water turbine unit 600 makes an emergency stop, there is a phenomenon of reverse flow of the technical water. In order to prevent the small water turbine 210 from reversing and ensure power generation safety, the braking control of the small water turbine 210 is carried out in time.

[0032] When it is obtained that the load of the water turbine unit 600 increases, the start-stop controller 330 can adjust the rotation speed of the small water turbine 210 according to the power generation demand. At this time, the start-stop controller 330 is also used to obtain the rotation speed data of the small water turbine 210 for comparison with the set rotation speed. For example, when the load of the water turbine unit 600 increases, the flow rate of the technical water in the technical water supply pipe 100 needs to increase synchronously. At this time, if it is necessary to increase the power generation synchronously, the braking of the small water turbine 210 can be completely cancelled. If it is necessary to keep the actual power generation not exceeding the rated power generation, when the rotation speed of the small water turbine 210 exceeds the set value, the small water turbine 210 is adaptively braked to avoid too fast rotation speed. If it is necessary to keep the current power generation, the rotation speed of the current small water turbine 210 is obtained, and the braking degree of the braking mechanism is adjusted to ensure stable and reliable power generation.

[0033] Furthermore, the power generation unit installation optimization unit 400 includes an installation quantity calculation module 410, and the installation quantity calculation module 410 is used to calculate according to the maximum allowable installation quantity of the power generation units 200 in the technical water supply pipe 100 N max ; wherein, ΔP 允许 is the pressure difference of the water flow allowed in the technical water supply pipe 100, ΔP 允许 ≤5%, K is the friction coefficient of the technical water supply pipe 100, L is the equivalent length, which is used to convert the resistance generated by components such as elbows and valves in the technical water supply pipe 100 to the technical water into the resistance generated by an equivalent length of pipeline.

[0034] During actual use, the quantity of the power generation units 200 N satisfies 1≤ N ≤ N max ; when the quantity of the power generation units 200 is not less than two, the installation spacing of the power generation units 200 can be selected and determined by CFD simulation to ensure that the pressure drop in the technical water pipe 100 is controllable.

[0035] Furthermore, the power generation unit installation optimization unit 400 also includes an installation position processing module 420, and the installation position processing module 420 is used to determine the installation height of the small water turbine 210 in the technical water supply pipe 100 H opt , where H is the head height of the small water turbine 210, ΔP 管 is the pressure difference of the water flow on both sides of a single small water turbine 210, g is the acceleration of gravity, v is the flow velocity of the water flow in the technical water supply pipe 100, and the flow velocity v of the water flow in the technical water supply pipe 100 is determined under the rated working conditions of the water turbine unit.ρ is the density of the water flow.

[0036] Furthermore, the power generation and collection unit 500 includes a power generation statistics module 520 and an energy storage module 510; the power generation statistics module 520 is electrically connected to the generator 230 through the energy storage module 510; the power generation statistics module 520 calculates the power generation of the generator 230 through and obtains the power generation of the generator 230 W 辅 , where η is the power generation efficiency of the generator 230, H 净 is the net head of the small water turbine 210.

[0037] Among them, the energy storage module 510 is preferably electrically connected to at least two power generation units 200, and the power generation statistics module 520 is used to count the theoretical electricity storage capacity of the corresponding energy storage module 510.

[0038] Embodiment 2 Refer to Figure 2 , based on the water turbine unit water supply pipeline efficiency improvement power generation system provided in Embodiment 1, this embodiment provides a water turbine unit water supply pipeline efficiency improvement power generation method, including the following steps: S1. Obtain the water flow state in the technical water supply pipe 100; S2. Determine the number of power generation units 200 in the technical water supply pipe 100 according to the water flow state in the technical water supply pipe 100; S3. Set the corresponding number of power generation units 200 inside the technical water supply pipe 100; S4. Control the start and stop of the power generation unit 200 according to the water flow state in the technical water supply pipe 100; S5. The power generation unit 200 uses the water flow in the technical water supply pipe 100 to generate power; S6. Collect the power generation of the power generation unit 200.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present invention.

Claims

1. A water turbine unit water supply pipeline efficiency-enhancing power generation system, characterized in that: include: A technical water supply pipe (100) for supplying water to the turbine unit (600); A power generation unit (200) is arranged inside the technical water supply pipe (100) and is used to generate electricity through the water flow in the technical water supply pipe (100); A power generation start and stop control unit (300), connected to the power generation unit (200) by signal, and used to control the start and stop of the power generation unit (200) according to the water flow state in the technical water supply pipe (100); A power generation unit installation optimization unit (400) is used to determine the installation state of the power generation unit (200) in the technical water supply pipe (100) according to the water flow state in the technical water supply pipe (100); The power generation collection unit (500) is electrically connected to the power generation unit (200) and is used to collect the power generation of the power generation unit (200).

2. The water turbine unit water supply pipeline efficiency-enhancing power generation system according to claim 1, characterized in that: The power generation unit (200) comprises a connecting sleeve (201) and a small water turbine (210), a coupling (220) and a generator (230) connected in sequence, the small water turbine (210) faces the water inlet end of the technical water supply pipe (100), the small water turbine (210), the coupling (220) and the generator (230) are all arranged in the connecting sleeve (201), and the connecting sleeve (201) and the technical water supply pipe (100) are coaxially arranged; The connecting sleeve (201) is connected to the technical water supply pipe (100) via a connecting flange (202), and the small water turbine (210) is signal-connected to a power generation unit start / stop control unit (300).

3. The water turbine unit water supply pipeline efficiency-enhancing power generation system according to claim 2, characterized in that: The connecting sleeve (201) is provided with an inspection window; The inner diameter of the connecting sleeve (201) is the same as the inner diameter of the technical water supply pipe (100), and the spacing S between the power generation unit (200) and the water outlet end of the technical water supply pipe (100) satisfies 5D≤S≤8D, where D is the inner diameter of the technical water supply pipe (100).

4. The water turbine water supply pipeline efficiency-enhancing power generation system according to claim 3, characterized in that: The angle between the blades of the small water turbine (210) and the water flow direction is 15°, and the coupling (220) is a magnetic coupling.

5. The water turbine unit water supply pipeline efficiency-enhancing power generation system according to claim 3, characterized in that: The power generation unit start-stop control unit (300) comprises a flow meter (310), a pressure sensor (320) and a start-stop controller (330); the flow meter (310) and the pressure sensor (320) are both installed in the connecting sleeve (201); the flow meter (310) and the pressure sensor (320) are both connected to the start-stop controller (330) by signal; and the start-stop controller (330) is connected to the small water turbine (210) by signal; The flow meter (310) is used to collect the water flow rate Q at a corresponding position in the technical water supply pipe (100), and the pressure sensor (320) is used to collect the pressure P at a corresponding position in the technical water supply pipe (100); The start-stop controller (330) is used to send a start signal when the water flow rate is greater than the rated flow rate and the pressure fluctuation per unit time does not exceed 10%; otherwise, a stop signal is sent; The small water turbine (210) performs braking when receiving a stop signal, and cancels braking when receiving a start signal.

6. The water turbine water supply pipeline efficiency-enhancing power generation system according to claim 5, characterized in that: The start-stop controller (330) is also used to obtain the working state of the water turbine unit (600); When the water turbine unit (600) stops suddenly, the start-stop controller (330) sends a stop signal.

7. The water turbine unit water supply pipeline efficiency-enhancing power generation system according to claim 6, characterized in that: The power generation unit installation optimization unit (400) comprises an installation quantity calculation module (410), wherein the installation quantity calculation module (410) is used to calculate the number of Calculate the maximum number of power generation units (200) that can be installed in the technical water supply pipe (100) N max ; Among them, ΔP 允许 is the pressure difference of the water flow allowed in the technical water supply pipe (100), K is the friction coefficient of the technical water supply pipe (100), and L is the equivalent length.

8. The water turbine water supply pipeline efficiency-enhancing power generation system according to claim 7, characterized in that: The power generation unit installation optimization unit (400) further comprises an installation position processing module (420) for Determining the installation height of the small water turbine (210) in the technical water supply pipe (100) H opt , where H is the water head height of the small turbine (210), ΔP 管 is the pressure difference of the water flow on both sides of the small water turbine (210), g is the acceleration of gravity, v is the flow velocity of the water flow in the technical water supply pipe (100), ρ is the density of the water flow.

9. The water turbine water supply pipeline efficiency-enhancing power generation system according to claim 8, characterized in that: The power generation collection unit (500) comprises a power generation statistics module (520) and an energy storage module (510); The power generation statistics module (520) is electrically connected to the generator (230) via the energy storage module (510); The power generation statistics module (520) is configured by Calculate the power generation of the generator (230) W 辅 ,in, η is the power generation efficiency of the generator (230), H 净 is the net water head of the small water turbine (210).

10. A method for increasing the efficiency of power generation in a water supply pipeline of a water turbine unit, characterized in that: The water supply pipeline efficiency-enhancing power generation system for a water turbine unit according to claim 1 comprises the following steps: S1, obtaining the water flow state in the technical water supply pipe (100); S2. determining the number of power generation units (200) in the technical water supply pipe (100) according to the water flow state in the technical water supply pipe (100); S3, arranging a corresponding number of power generation units (200) inside the technical water supply pipe (100); S4, controlling the start and stop of the power generation unit (200) according to the water flow state in the technical water supply pipe (100); S5, the power generation unit (200) generates electricity using the water flow in the technical water supply pipe (100); S6. Collecting the power generated by the power generation unit (200).

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