JP2017078354A - Power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation system which generates power without depending on an environment.SOLUTION: A power generation system includes: water storage tanks 10 which are provided connecting with each other in a vertical direction and store water therein; a supply tank 20; water conduit pipes 102, each of which enables the water storage tank 10 and the supply tank 20 to communicate with each other and is used to flow water from the lower tank to the upper tank between the water storage tank 10 and the supply tank 20; a discharge valve 208 which is provided at the supply tank 20 and discharges the water in the tank to a lower side; a vacuum pump 204 which is provided at the supply tank 20 and causes the water to flow from the water storage tank 10j to the supply tank 20 through the water conduit pipe 102j; a hydraulic generation device 30 which is provided below the supply tank 20, receives the water discharged from the discharge valve 208, and generates power by kinetic energy of the water; and a water conduit pipe 506 which enables communication between the hydraulic generation device 30 and the water storage tank 10a and causes the water used for power generated by the hydraulic generation device 30 to flow into the tank.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power generation system that generates power using a liquid such as water.

In recent years, anxiety about nuclear power generation has increased from the viewpoint of environmental protection, and the power generation rate of nuclear power generation in Japan's total power generation has dropped to several percent. In the current situation where reliance on nuclear power generation is difficult, as alternative to nuclear power generation, thermal power generation using fossil fuel, solar power generation using sunlight, and hydropower generation using water flow Is attracting attention. Thermal power generation uses depletion energy such as coal, oil, and natural gas, so there are problems of depletion and soaring of these resources, and the environment such as global warming due to the release of a large amount of CO ₂ into the atmosphere. There is a problem of contamination. Moreover, since solar power generation uses sunlight, which is a renewable energy, these problems do not occur, but there is a problem that it cannot be expected as a large power source because the energy conversion efficiency is generally about 20%.

  Hydropower, on the other hand, converts kinetic energy into electrical energy by flowing (falling) water, which is renewable energy, from high to low, and rotating water turbines. The conversion efficiency is generally 80% or more.

  As a related technology, water discharge from the water storage area is guided to the stationary part of the hydroelectric power generation unit arranged at a position lower than the water storage area, and the hydroelectric power generation unit itself is placed between the position higher than the stationary part and the stationary part. A hydroelectric power generation facility that moves up and down is known (see, for example, Patent Document 1).

Japanese Patent No. 4155949

  In general, including the hydroelectric power generation facility described in Patent Document 1, it is necessary to construct a dam by placing concrete in a mountainous area and damming a river to provide a water storage area. Therefore, since it is necessary to store water in the water storage area, there has been a problem that its power generation capacity is affected by changes in the environment such as a decrease in rainfall and accumulation of sediment in the reservoir after many years of use.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a power generation system capable of generating power without being influenced by the environment.

  In order to solve the above-described problem, according to one embodiment of the present invention, a plurality of hermetically sealed storage tanks that are provided in the vertical direction and store liquid therein and the adjacent storage tanks communicate with each other, and are adjacent storages. A plurality of first conduits for allowing the liquid to flow from the lower storage tank to the upper storage tank between the tanks, and the uppermost storage tank, and is openable and closable to discharge the liquid in the storage tank downward. A valve, a pump that is provided in the uppermost storage tank and that allows liquid to flow into the uppermost storage tank from the storage tank adjacent to the lower side of the storage tank via the first water conduit; A power generation unit that is provided below the storage tank and receives the liquid discharged from the valve and generates power using its kinetic energy, and the power generation unit and the lowermost storage tank communicate with each other. Let the used liquid flow into the storage tank Comprising a second water conduit of order, the.

  According to the present invention, power generation can be performed without being influenced by the environment. The other effects of the present invention will be described in the section for carrying out the invention below.

It is a figure for demonstrating the outline | summary of the electric power generation system which concerns on this Embodiment. It is a schematic diagram which shows the structure of a power generation system. It is side surface sectional drawing of a hydroelectric generator. It is a plane sectional view of a hydroelectric generator. It is a schematic diagram of the electric power generation system in an initial state. It is a figure which shows the state into which water flowed in the supply tank. It is a figure which shows the state in which water is flowing in into the lowermost water storage tank. It is a figure which shows the state in which water is flowing in into the water tank adjacent to the upper direction of the lowermost water tank. It is a figure which shows the state with which the water storage tank and the supply tank were satisfy | filled with water.

  Hereinafter, the power generation system according to the present embodiment will be described with reference to the drawings. In addition, in this specification and drawing, about the component which has the substantially the same function, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(Overview)
First, in order to facilitate understanding of the power generation system according to the present embodiment, an outline of the power generation system will be briefly described. As shown in FIG. 1, the power generation system 1 includes a plurality of water storage tanks 10 a to 10 j that are filled with a liquid such as water and are continuously provided in the vertical direction. (Referred to as a tank 10) and a supply tank 20, and a hydroelectric generator 30 that is provided below the supply tank 20 and generates power using kinetic energy that flows (drops) in water.

  Each of the plurality of water storage tanks 10 and the supply tanks 20 are connected to each other by a water conduit that allows water to flow. Similarly, the supply tank 20 and the hydroelectric generator 30 are connected to each other by a water conduit. And the water storage tank 10a are connected by a water conduit. As described above, in the power generation system 1, the water storage tank 10, the supply tank 20, and the hydroelectric power generation device 30 are connected in a substantially ring shape through the water conduits, and the water is ring-shaped as indicated by an arrow A in FIG. It can be circulated. This circulation can be realized by the water in the supply tank 20 falling downward in the vertical direction, whereby the water located in the vertical downward direction is pushed up in the vertical direction. That is, the power generation system 1 according to the present embodiment is configured as described above to drop water from the supply tank 20 to the hydroelectric generator 30 to operate the hydroelectric generator 30 and discharge from the hydroelectric generator 30. The generated water is allowed to flow again into the supply tank 20 via the water storage tank 10 to realize continuous power generation.

  In view of such power generation by the hydroelectric generator 30, the distance of water to be dropped onto the hydroelectric generator 30, that is, the drop between the supply tank 20 and the hydroelectric generator 30 is sufficient kinetic energy for power generation due to the fall of water. In other words, it is preferable to have a large height difference, and more preferably a head of about 30 m. Based on this, in the present embodiment, the power generation system 1 is erected so as to have a height of 50 m from the ground surface to the water storage tank 10j. Specifically, the water storage tank 10 and the supply tank 20 are arranged every 5 m in the vertical direction in consideration of the inflow of water into each tank described later. In addition, these dimensions are suitable dimensions, and are not limited thereto, and may be any dimensions that can be a drop that can be generated by the hydroelectric generator 30. For example, the number of water storage tanks 10 may be less than 10 (that is, the height from the ground surface to the water storage tank 10j is less than 50 m), or more than that. May be provided at intervals of less than 5 m or less than 5 m. Hereinafter, details of each component of the power generation system 1 will be described with reference to FIG.

(Water storage tank 10)
As shown in FIG. 2, each water storage tank 10 is a sealed structure surrounded by walls on the upper and lower sides, and the water conduits 102 a to 102 j (hereinafter, these are not distinguished from each other) on the upper side wall near the ceiling. Is referred to as a water conduit 102), and one end of a water conduit 506 communicating with a water storage tank 50 described later is connected. Therefore, the water storage tank 10 extends downward from the upper portion of the side wall and can store water. Further, the water storage tank 10 is disposed in a state where the other end of the water conduit 102 communicating with the water tank adjacent to the upper side (communication with the supply tank 20 in the water storage tank 10j) is inserted into the tank. The opening surface of the other end is preferably arranged so as to be immersed in the water with the tank filled with water.

  Further, each water storage tank 10 is provided with vacuum pumps 104a to 104j for evacuating the tank in the upper part of the side wall in the vicinity of the ceiling and facing the upper part of the side wall. The vacuum pump 104 is operated to suck the air in the tank, so that water can be drawn into the own tank from the water storage tank adjacent to the lower side through the water conduit 102. It is possible. The vacuum pump 104 can be controlled by a control device including hardware such as a CPU and a memory (not shown), and the inside of the tank can be appropriately brought into a vacuum state or an atmospheric release state. Moreover, the vacuum pump 104 can make the inside of a tank airtight, for example by providing a valve | bulb suitably.

(Supply tank 20)
Similarly to the water storage tank 10, the supply tank 20 is a sealed structure surrounded by walls on the upper and lower sides, and the capacity thereof is preferably the same as that of the water storage tank 10. One end of the water conduit 102j is connected to the upper part of the side wall near the ceiling of the supply tank 20, and therefore the supply tank 20 extends downward from the upper part of the side wall and can store water. ing. Further, the supply tank 20 is provided with a vacuum pump 204 for evacuating the tank in the upper part of the side wall in the vicinity of the ceiling and facing the upper part of the side wall described above. By sucking the air, water can be drawn into its own tank from the water storage tank 10j adjacent to the lower side through the water conduit 102j. Since the vacuum pump 204 is the same as the vacuum pump 104 described above, description thereof is omitted here.

  Further, the other end of a water conduit 206 whose one end extends to a water receiving tank 40 described later is connected to the bottom of the supply tank 20, and the supply tank 20 is connected to the one end of the water conduit 206. A discharge valve 208 is provided for discharging the water inside. The discharge valve 208 is controlled to be opened and closed by the control device described above, so that the water in the supply tank 20 can be discharged to the water receiving tank 40.

(Receiving tank 40)
The water receiving tank 40 is a box-like structure having an opening opened below the supply tank 20, specifically, between the discharge valve 208 and the hydroelectric generator 30. The water discharged from the tank 20 is received, and the water flows out to the hydroelectric generator 30 through a water conduit 402 provided at the bottom and extending downward and connected to the hydroelectric generator 30. In the present embodiment, it is preferable to form the opening so that the opening surface is positioned at least above the inner bottom surface 106j of the water storage tank 10j. By forming in this way, in the state where the various tanks of each water storage tank 10, the water receiving tank 40, and the water storage tank 50 are filled with water, the liquid level of the water in the water storage tank 10 j and the liquid in the water receiving tank 40. The surface can be coplanar. Therefore, if the appropriate amount of water that the other end of the water conduit 102 j is immersed in the water surface of the water storage tank 10 j is accumulated in the water receiving tank 40, the water in the water storage tank 10 j can be pulled up by the vacuum pump 204 of the supply tank 20. It becomes possible.

(Hydroelectric generator 30)
The hydroelectric generator 30 is a power generation turbine that receives water flowing from the water conduit 402, in other words, water that falls downward from above and generates power, and flows the water out into a lower storage tank 50 described later. A water wheel, a Francis wheel, etc. can be used. Any hydroelectric generator 30 may be used as long as it can generate electric power by flowing a liquid.

  Specifically, as shown in FIGS. 3 and 4, the hydroelectric power generation apparatus 30 includes a swivel unit 302 connected to the water conduit 402, and a rotatable impeller (approximately the center of the swivel unit 302). Turbine) 304, a shaft 306 which is provided so as to protrude upward in the center of the impeller 304 and is rotatable with the impeller 304, and is connected to the shaft 306 to convert the rotation (mechanical energy) of the shaft 306 into electrical energy. And a generator 308.

  The power generation method of the hydroelectric generator 30 will be briefly described. First, water flowing from the water conduit 402 flows into the swivel unit 302, swirls so as to draw a spiral, and reaches the impeller 304. This water flow rotates the impeller 304 and the shaft 306. Electric power can be generated by converting the rotation of the shaft 306 into electric energy by the generator 308. The water that has rotated the impeller 304 can flow into the water conduit 502 through a hole that is provided between each blade of the impeller 304 and communicates with a water conduit 502 that communicates with a water storage tank 50 described later. While the electric power generated by the hydroelectric generator 30 is sent to an external device via a transformer or the like, a part of the electric power is supplied to the vacuum pumps 104 and 204 described above, that is, the hydroelectric generator 30 is connected to the vacuum pumps 104 and 204. It plays a part of the power supply. For example, the power transmission line of the hydroelectric generator 30 is connected to a battery (not shown) included in the vacuum pumps 104 and 204 so that the battery can be charged with the transmitted power. The vacuum pumps 104 and 204 may be charged by connecting a power supply device such as a solar panel that generates power using sunlight to the battery of each pump.

(Water tank 50)
As shown in FIG. 2, the water storage tank 50 is disposed below the hydroelectric generator 30, is connected to the water conduit 502, and stores water discharged from the hydroelectric generator 30. One end of the above-described water conduit 502 is connected to the ceiling wall of the water storage tank 50, and water used for power generation flows from the hydroelectric generator 30 through the water conduit 502. In addition, the water storage tank 50 is provided with a water injection valve 504 that can be connected to a water injection device (not shown) on the ceiling wall and can be opened and closed. The water injection valve 504 can inject water from the outside. The tank can be sealed or opened by opening and closing the water injection valve 504. It is preferable that the water injection valve 504 can be controlled by the control device described above. At the bottom of the water storage tank 50, a water conduit 506 is provided which communicates with the water storage tank 10a and flows out the water in the water storage tank 50 into the water storage tank 10a.

  The above-mentioned various tanks and water conduits are preferably composed of materials similar to these, such as iron and concrete, but even if they are filled with water and provided with the various devices described above, they do not break themselves. Any material that can sufficiently withstand the weight may be used.

(Power generation method)
Next, the power generation method by the power generation system 1 according to the present embodiment having the above-described configurations will be described in detail with reference to FIGS. 5 and 6.

  As shown in FIG. 5, it is assumed that the water storage tank 10, the water receiving tank 40, and the water storage tank 50 are filled with water. At this time, the vacuum pump 104j is open, the vacuum pumps 104 other than the vacuum pump 104j, and the discharge valve 208 are closed, and the tanks other than the water storage tank 10j and the water receiving tank 40 are sealed. Thus, various tank systems other than the supply tank 20 are connected. Further, in this state, the water surfaces of the water storage tank 10j, the water conduit 102i, and the water receiving tank 40 are the same plane. A method for shifting to the initial state will be described later.

  In the initial state, first, the vacuum pump 204 is driven to draw water in the water storage tank 10 j into the supply tank 20. At this time, since the inside of the water storage tank 10j is open to the atmosphere, until the inside of the supply tank 20 is filled with water as shown in FIG. 6 and the other end of the water conduit 102j is exposed by this drawing. Then, the water level in the water storage tank 10j is lowered.

  After drawing water until the other end of the water conduit 102j is exposed, the vacuum pump 104j is closed, the vacuum pump 204 is opened to the atmosphere, and the discharge valve 208 is opened, so that the water in the supply tank 20 is drained. It discharges to the water receiving tank 40. Note that the timing of driving the vacuum pumps 104 and 204 described above may be controlled according to time, for example, a sensor that detects the position of the water surface in the water storage tank 10j, the weight of water in both tanks, and the like. May be provided, and the control device may be controlled in conjunction therewith.

  The discharged water flows into the water receiving tank 40. Here, as the water flows into the water receiving tank 40 and the volume of the water increases, the water surface of the conduit pipe 102i connected to the system rises, and the water flows into the water storage tank 10j that is open to the atmosphere. It becomes. That is, according to the flow of this water, the water in the water receiving tank 40 flows (falls) into the hydroelectric generator 30 through the water conduit 402, so that the impeller 304 of the hydroelectric generator 30 rotates to generate power. It can be performed. The water used for power generation and discharged from the hydroelectric generator flows into the water storage tank 50 through the water conduit 502, and the water in the water storage tank 50 is pushed out so that the water in each water storage tank 10 flows upward. Thus, water flows into the water storage tank 10j. If this continues until all the water in the supply tank 20 is discharged, the water tank 10, the water receiving tank 40, and the water storage tank 50 as shown in FIG. Therefore, the water in the water storage tank 10j is pulled up again into the supply tank 20 and discharged, so that power generation by the hydroelectric generator 30 can be performed intermittently.

  According to the power generation system 1 according to the present embodiment, only the water storage tank 10j and the water receiving tank 40 are open to the atmosphere, and other various tanks cause water to flow in a sealed state. By configuring the internal water to circulate, compared to power generation facilities such as dams built in mountainous areas, it is not affected by environmental changes such as rainfall and sediment accumulation, and There is an extremely useful effect that power can be generated intermittently without damaging the water that is the resource. In addition, the power generation system 1 does not need to limit the site, and it is only necessary to secure an installation area, so it is easy to secure the site. For example, the power generation system 1 can be installed in the vicinity of a river or a lake. In this case, water can be easily supplied into the water storage tank 50. It is preferable that the power generation system 1 is provided in the basement in consideration of environmental influences such as the discharge of water from the discharge valve 208 and noise associated with the driving of the vacuum pumps 104 and 204.

  In addition, in order to generate electric power with the electric power generation system 1, it is necessary to fill the various tanks of the electric power generation system 1 with water and to be in the initial state described above. The method of filling the various tanks with water is appropriate, but in the present embodiment, after only one of the water storage tanks 10 is driven to fill the water storage tank with water, This is realized by driving only the pump of the water storage tank adjacent to the tank to fill the tank with water and sequentially performing this operation from the water storage tank 10a to the supply tank 20. Below, the transition to the initial state of the electric power generation system 1 which concerns on this Embodiment is demonstrated in detail using FIGS. 7-9. The thick arrows shown in these figures indicate the flow of water, and the thin arrows indicate the flow of air.

(Transition method to the initial state)
First, water is injected into the water storage tank 50 through the water injection valve 504, and the vacuum pumps 104 and 204 and the discharge valve 208 are closed. After that, as shown in FIG. 7, the vacuum pump 104a of the water storage tank 10a is driven to cause the water in the water storage tank 50 to flow into the water storage tank 10a. After the water storage tank 10a is filled with water, as shown in FIG. 8, the drive of the vacuum pump 104a of the water storage tank 10a is stopped to open the atmosphere, and the vacuum of the water storage tank 10b adjacent above the water storage tank 10a is made. The pump 104b is driven, and the water in the water storage tank 10a flows into the water storage tank 10b through the water conduit 102a. As a result, the water surface in the water storage tank 10a is lowered to such an extent that the opening surface of the other end portion inserted into the water storage tank 10a of the water conduit 102a is exposed. In this state, air is continuously drawn until the flow of water disappears, so that all the water in the water conduit 102a flows into the water storage tank 10b, and the water storage tank 10b is filled with water. Therefore, even if the driving of the vacuum pump 102b is stopped and the atmosphere is released, the water in the water storage tank 10b does not flow back into the water storage tank 10a in the lower air release state.

  Next, the vacuum pump 104c is driven, and the water in the water storage tank 10b is caused to flow into the water storage tank 10b through the water conduit 102b. As a result, the water level in the water storage tank 10b is lowered to such an extent that the opening surface of the other end inserted through the water storage tank 10b of the water conduit 102b is exposed. In this state, air is continuously drawn until there is no flow of water, so that all the water in the water conduit 102b flows into the water storage tank 10c, and the water storage tank 10c is filled with water. For this reason, even if the driving of the vacuum pump 102b is stopped and the atmosphere is released, the water in the water storage tank 10c does not flow back into the water storage tank 10b in the lower air release state.

  After that, by repeatedly pulling up the water by suction of air from the vacuum pump 104 from the water injection into the water storage tank 50 through the water injection valve 504, the water does not flow back downward, and the supply tank 20 and the water storage tank 10j, water storage tanks 10i,... And each water storage tank 10 can be filled with water sequentially from above, and the water storage tank 10 and the supply tank 20 can be filled with water as shown in FIG. In order to draw water from the lower storage tank 10, the vacuum pump needs to be closed as the upper tank is sequentially filled with water. For example, when the supply tank 20 is filled with water, the vacuum pump 204 is closed, and when the water storage tank 10j is filled with water, the vacuum pump 104j is further closed. Thereafter, the water storage tank 50 can be filled with water by injecting water from the water injection valve 504 with all the vacuum pumps closed. 2 and 5 to 9, the opening surface of the other end of the water conduit 102 and the inner bottom surface of the water storage tank 10 are largely separated from each other, but the water in the lower water storage tank 10 is not illustrated. So that they can flow into the upper water storage tank 10 as much as possible (preferably all).

  With respect to the water receiving tank 40, water may be stored up to the surface of the water storage tank 10j by pumping water with a water injection device such as a pumping pump (not shown) separately and injecting water into the water receiving tank 40 in the above-described state. At this time, when the vacuum pump 104j is opened to the atmosphere, the water level in the water guide pipe 102j is pushed up by the water pressure and becomes flush with the water level of the water receiving tank 40. In addition, a valve or the like for temporarily blocking water is provided in the water conduits 402 and 502 or the hydroelectric generator 30, and water is stored in the water receiving tank 40 and the water conduit 402 by discharging water from the supply tank 20 a plurality of times. Then, the valve may be opened thereafter.

  In the present embodiment, power generation using water is taken as an example. However, the present invention is not limited to this, and any liquid that can be dropped by using a height difference and can be generated by the hydroelectric generator 30 is used. Anything can be used. In addition, the state in which the water storage tank 10 is filled with water is set as the initial state, but the present invention is not limited to this, and the rear end opening of the water conduit 102 inserted into the water tank 10 may be immersed under the water surface. That's fine. 5 to 9 show that the water storage tank 10 and the supply tank 20 are filled with water, there is a space, that is, air in the passage leading to the vacuum pumps 104 and 204. You may make it fill all the space in a tank with water, without providing. At this time, in order to prevent the backflow of water in the tank, it is preferable to provide check valves in various water conduits. For example, the check valve is provided at a connection portion between the water storage tank 10 a and the water conduit 506. In addition, you may make it provide this check valve in the electric power generation system 1 in which air exists in the important point mentioned above.

  The present invention can be implemented in various other forms without departing from the gist or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Moreover, all modifications, various improvements, substitutions and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

  The power generation system described in the claims corresponds to, for example, the power generation system 1 in the above-described embodiment, and the storage tank corresponds to, for example, the storage tank 10 and the supply tank 20. The first water conduit corresponds to, for example, the water conduit 102, and the second water conduit corresponds to, for example, the water storage tank 50 and the water conduits 502 and 506. The valve corresponds to, for example, the discharge valve 208, and the pump corresponds to, for example, the vacuum pumps 104 and 204. The power generation unit corresponds to, for example, the hydroelectric power generation apparatus 30, and the temporary storage tank corresponds to, for example, the water receiving tank 40.

DESCRIPTION OF SYMBOLS 1 Electric power generation system 10,10a-10j Reservoir tank 102,102a-102j Water conduit 104,104a-104j Vacuum pump 20 Supply tank 204 Vacuum pump 208 Release valve 30 Hydroelectric power generator 40 Receiving tank 50 Reservoir tank 502,506

Claims (8)

A plurality of sealed storage tanks that are arranged in a plurality in the vertical direction and store liquid inside,
A plurality of first conduits for communicating liquid from the lower storage tank to the upper storage tank between the adjacent storage tanks respectively communicating with the adjacent storage tanks;
An openable / closable valve that is provided in the uppermost storage tank and discharges the liquid in the storage tank downward;
A pump that is provided in the uppermost storage tank and allows liquid to flow into the uppermost storage tank from the storage tank adjacent to the lower side of the storage tank via the first water conduit;
A power generation unit that is provided below the uppermost storage tank, receives the liquid discharged from the valve, and generates power by its kinetic energy;
A second water conduit for communicating the power generation unit and the lowermost storage tank, and allowing the liquid used for power generation by the power generation unit to flow into the storage tank;
A power generation system comprising: The pump is a vacuum pump, and in the state where the valve is closed, the inside of the uppermost storage tank is evacuated so that the liquid in the storage tank adjacent to the lower side of the storage tank is liquidated to the uppermost storage tank. Inflow into the storage tank, the atmosphere is released in a state where liquid has accumulated in the storage tank,
The valve is opened when the atmosphere is released to discharge liquid downward,
2. The power generation system according to claim 1, wherein after the liquid is discharged, the valve is closed to allow the liquid to flow into the storage tank by the pump.   An opening is provided above and provided below the valve, and the opening surface of the opening is located at least above the inner bottom surface of the storage tank adjacent to the lower part of the uppermost storage tank and is discharged from the valve. The power generation system according to claim 1, further comprising a temporary storage tank that receives the liquid and guides the liquid to the power generation unit located below. Each of the plurality of first water conduits is disposed so that one end thereof is connected to the side wall of the upper storage tank in the adjacent storage tank, and in the lower storage tank in the adjacent storage tank The other end is immersed in the liquid,
Each of the plurality of storage tanks is formed so as to extend downward from a location where one end of the first water conduit is connected to collect liquid. The power generation system according to any one of the above. The pumps are respectively provided in the plurality of storage tanks,
Prior to the liquid discharge of the valve,
After driving only one storage tank pump to fill the storage tank with liquid, drive only the storage tank pump adjacent above the storage tank to fill the storage tank with liquid. 5. The power generation system according to claim 1, wherein liquid is stored in the plurality of storage tanks by sequentially performing from a lowermost storage tank to an uppermost storage tank. .   The power generation system according to any one of claims 1 to 5, wherein at least a part of the power generated by the power generation unit is supplied to the pump.   The power generation system according to any one of claims 1 to 6, further comprising a power supply unit that supplies power to the pump.   The power generation system according to claim 7, wherein the power supply unit is a solar power generation device.

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