JP2006307818A - Tank water supply and drainage type hydroelectric power generation and tidal power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make efficient use of a water source in the electric power generation utilizing tidal level difference. <P>SOLUTION: A tank (1) for electric power generation is installed at a position where there is a water level difference in the water source and the water is supplied from a high level water and is drained to a low level water. An air turbine is rotated to generate electric power by a tank pressure change at that time. Equipment operated in the water is improved in durability and reliability and equipment requiring maintenance is disposed above the water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to hydroelectric power generation using a tank for supplying and draining water and an air turbine, and also relates to hydroelectric power generation utilizing a tidal level difference.

  Conventional hydroelectric power generation rotates turbines with water pressure, and fluid friction is large. At low water level differences, high-speed turbine rotation cannot be achieved, and power generation efficiency cannot be increased.

  Increase power generation efficiency with hydroelectric power generation with low water level difference.

  The power of the device related to power generation is operated at the pressure of the principle of the power generation device.

  Increase the durability and reliability of devices that operate in water, and place devices that require maintenance on the water.

  Use the tide level difference to secure the water source and separate the water source at the stage of the water level difference.

  The sluice that secures the water source of the tide level difference will have a highly reliable and durable structure.

  Simplify the power generation method for tide difference power generation and expand the expandability of installation.

Means to solve the problem

As shown in Figure 1, where there are two water sources with different water levels, install the tank so that the upper part of the tank is lower than the surface of the high water source (5) and the lower part of the tank is lower than the surface of the low water source (6). A water supply valve (3) is installed in the water of the high water level water source (5), and a drain valve (4) is installed in the water of the low water level water source (6). The power generation turbine (2) is placed above the water level of the high water level water source (5) above the power generation tank (1). When installed in this way, even when water is completely supplied to the power generation tank (1), air will enter and exit the power generation turbine (2). When the drainage valve (3) is closed and the drainage valve (4) is opened, the atmospheric pressure in the power generation tank (1) drops and the power generation turbine (2) rotates as intake air. The generator is rotated by this rotational force. Next, when the water supply valve (3) is opened with the drain valve (4) closed, water supply begins, the pressure inside the power generation tank (1) rises, and the power generation turbine (2) becomes exhaust and rotates. The present invention is a power generator that repeats this process. If the cross-sectional area of the turbine blade is 1 m ² , a pressure equal to the weight of water of 1 m ² × water level difference m is applied to the turbine blade, and if the water level difference is 1 m, 1 ton of pressure is applied to the turbine. It will take on the wings. In addition, the structure inside the power generation tank (1) may include a beam for strengthening the strength of the tank, but if it is too large, the water in the tank will be agitated and the humidity in the tank Will increase the life of the power generation turbine (2). In Fig. 1, there is an air layer at the top of the power generation tank (1), which makes it easy to understand the principle, but it is better to have no air layer to increase power generation efficiency.

When the power generation turbine (2) is connected between the exhaust port of the intake tank (8) of the power generation tank (8) that is full and depressurized as shown in FIG. Each pressure is added, and it becomes possible to generate electricity with double pressure. In other words, high-efficiency power generation is possible at high speed and pressure, and the speed of water supply and drainage will be increased. Then, when the water supply / drainage is switched, the decompression and pressurization of the power generation tank are switched, and the same highly efficient power generation can be performed in the opposite direction. This is particularly effective for power generation in environments where pressure is insufficient due to low water level differences.

The power generation tank (1) of the present invention can be used as a power source and applies pressure to control based on the same principle as the power generation tank (1). The upper part of the control pressure tank (10) shown in Fig. 4 is the air valve (16). Drain the pressure tank (10) for control and close the air valve (16) and drain valve (4). When the water supply valve (3) of the high water level water source (5) is opened, the water level in the control tank (12) in the control pressurized tank (10) tends to rise, so the air valve (16) is pressurized and this Hold the state and use it as a pressurized supply source when needed for control. Next, water is supplied to the decompression tank (11) for control shown in Fig. 5, and the air valve (16) and the water supply valve (3) are closed. When the drain valve (4) of the low water level water source (6) is opened, the water level in the decompression tank (11) for control tends to drop, so the air valve (16) is decompressed. Keep this state and use it as a reduced pressure supply source when necessary for control. In this case, the decompression force becomes a negative pressure corresponding to the weight of the water of the water level difference, and the atmospheric pressure is the standard. Underwater drive control is performed using these pressure sources. The drive pipe (13) is piped from the cylinder unit (14) of the piston cylinder structure shown in Fig. 4. When this drive pipe (13) is connected to an air valve (16) pressurized on water, the pressure in the drive cylinder (14) rises and the slide valve (15) can be moved. Next, the decompression control shown in Fig. 5 is that when the drive pipe (13) and the control pressurized tank (10) are connected, the water level maintenance tank (17) can be pulled to move the underwater drive unit. . If there is no water level maintenance tank (17) at that time, the water level rises due to pressurization, so the pressure will decrease due to the difference in water level. This is the same for pressure control. The reason why operating pressure is sent from the surface to the water by using this method is that it is difficult to break down because the device underwater has only the shape and functions, and the maintenance underwater is reduced.

As shown in FIG. 6, the water in the pressure-increasing control decompression tank (18) and the pressure-increasing control pressure tank (19) with the water supply valve (3), the drain valve (4) and the air valve (16) closed. ), And the exhaust port of the control pressure tank (10) is connected to the intake port of the pressure increase control decompression tank (18). Pressure can be taken out. This is possible by connecting the two tanks underwater, cutting the edge from the atmospheric pressure, and pressurizing only with the potential energy of the water level difference in the tanks connected underwater. The pressurized tank for control (10) is pushed by the atmospheric pressure of the high water level water source (5), but the decompression tank for pressure increase control (18) and the pressure increase tank for pressure increase control (19) are unrelated to the atmosphere. It is to say. In the case of the decompression tank (18) for pressure increase control and the pressure tank (19) for pressure increase control, the water level in the tank is the water level (20) at the completion of pressurization and decompression. That is, in order to finish the pressure increase / decrease of the three tanks at the same time, the pressure increase control pressure reducing tank (18) and the pressure increase control pressure tank (19) need to have double the capacity of the control pressure tank (10). Become. This device can be connected to multiple pressure reducing tanks (18) and pressure increasing pressure tanks (19) to increase pressure. However, this method can be used for control because the water surface stops at half the tank position, but it is not suitable for power generation because there is no continuity.

In underwater slide type pressure valve drive, as shown in Fig. 7, when the pressure valve is closed, pressure is applied to one side, and a large force is required to move the valve due to friction. Therefore, as shown in FIG. 8, another pressure inlet / outlet passage is formed to reduce the frictional force, and the pressure passage 2 (55) in the opposite direction so as to cancel the pressure vector of the pressure passage 1 (54) applied to the valve plate surface. And pressure passage 3 (56). That is, as shown in FIGS. 9 and 10, since both the pressure input passage (22) and the pressure output passage (23) exist on one side of the slide valve (15), the piping of the pressure input / output passage is connected to the slide valve (15 ). With this method, the pressure vector is balanced even during opening and closing, reducing the frictional force and making the slide valve (15) move smoothly. As shown in Fig. 9 and Fig. 10, it can be seen that the pressure applied to the slide valve (15) when it is closed is balanced. In addition, a small amount of water flow is generated in the gap between the contact surfaces of the drive unit due to the pressure difference, and the contact surfaces are separated, and the frictional force is greatly improved. In addition, it is possible to create a non-contact state of the slide valve (15) by providing a pressure surface in the downward direction of the slide valve (15) so as to cancel the dead weight of the slide valve (15) by pressure control or the like. There is. This slide valve (15) is not suitable for flowing a large amount of water, but has a feature as a highly reliable pressure control valve. Next, apply the principle of the drive tube to detect the moving position of the slide valve (15). As shown in FIG. 11, a pressure bypass for position detection opens the pressure detection port (25) when the slide valve (15) closes the pressure detection port (25) and the slide valve (15) moves to reach the detection position. Place hole (24). As shown in FIG. 12, if the pressure of the detection tube is set in advance so as not to be the pressure of the water depth, when the pressure detection port (25) and the position detection pressure bypass hole (24) overlap, detection on the water is performed. Changes in pressure can be detected with the sensor at the top of the tube. Next is a method to prevent the drive unit from running away underwater. As shown in FIG. 13, the pressure of the drive unit cylinder part (14) is released to the outside through the cylinder static pressure bypass port (26) at a specified position as shown in FIG. (15) stops. This method can be used for driving during pressurization. This function is an effective means for protecting the malfunction of the drive unit. However, the pressure reduction control operation cannot be performed in this state, and in order to return, the slide valve (15) returns due to its own weight or the drive cylinder portion (14) is required on the opposite side of the slide valve (15). The Next, as a shock absorbing function for collision during driving, a method of creating a pressure-sealing structure immediately before the collision, in the case of FIG. 14, even if there is inertia force in the slide valve (15) in the reduced pressure drive, Since the end of 14) has a pressure-tight structure, the slide valve (15) and the drive unit cylinder (14) do not collide. Since underwater maintenance is very difficult, it is important to have a structure that has many functions in shape. In addition, there is an advantage that it can be used as a device by giving a function to a durable material in water like concrete.

The underwater pressure valve has a structure that supports the pressure with the fan column pressure valve support (28) of the rotating shaft of the fan column pressure valve (27) and closes the pressure with a fan-shaped arc surface as shown in Figs. The fan-shaped buried part acts as a piston cylinder. Piping from the drive pipe (13) to the drive cylinder part (14), the fan column pressure valve (27) is raised and lowered by pressure. The advantage of this fan column pressure valve (27) is that the pressure is supported by the rotating shaft, so the friction received from the pressure is the rotating shaft, and the pressure control is the fan part outside the rotation, so it is driven by the law of moment. This is because pressure control is advantageous against friction that hinders friction. Next, we make use of the feature of the fan column pressure valve (27) to assist in opening and closing the large flow type slide valve (52) with a high degree of sealing. As with Fig. 7, the large-flow type slide valve (52) closed with pressure is difficult to open and close due to friction, but as shown in Fig. 17, a fan chamber pressure valve (27) once created a closed chamber, Pressure is injected to eliminate friction caused by the pressure of the large flow type slide valve (52). This makes it easy to open and close the large flow type slide valve (52). Valve performance is important in this generator with many valve opening and closing times. With this method, the life of the device can be extended with less burden on the device. The fan column pressure valve (27) can play a role as the main function of a large capacity on-off valve with a little poor sealing.

In the sluice that secures the water source by the tide level difference, the sluice closing part (29) is balanced by the sluice weight balance part (31) at the sluice rotary part (30) by the principle of seesaw as shown in FIG. It becomes a sluice that opens and closes in response. As shown in FIGS. 20 and 21, the sluice closing part (29) of the sluice reacts to water pressure and water flow, and when the water level on the side to be blocked rises, it is covered with water flow and further sealed with water pressure. Will be raised. Basically, the rotary shaft of the sluice rotation part (30) can be operated both horizontally and vertically, but when the water level falls below the sluice gate, it becomes difficult to operate due to friction due to its own weight. This makes it easier to create an environment for placing underwater. A large impact is generated at the moment when the sluice closing part (29) of the sluice is covered, but as shown in FIGS. 18 and 22, the impact absorbing part (32) and the pressure sealing bit (37) when the sluice is closed The structure that seals water at the moment of closing can be made and the speed at the moment of closing the lid can be slowed down. Moreover, if a piston cylinder structure is made in the sluice weight balance part (31) and the drive unit cylinder part (14), it can be opened and closed by pressure control. If a valve that releases pressure is attached to the cylinder, it can have both pressure control and natural opening and closing functions. Next, if this open / close valve is an underwater-only operating environment, when the specific gravity of the material is close to that of water, even if the sluice weight balance portion (31) is removed as shown in FIG. As it drifts in the water, it will react to the water flow without friction due to its own weight. If the sluice closing part (29) and the sluice rotating part (30) are heavy with a slight difference in specific gravity, the sluice closing part (29) and the sluice rotating part (30) It will naturally cover with its own weight.

In the case of power generation using the tide level difference, the sluice gate is opened and closed as shown in Fig. 24 to secure the multi-stage maximum water level water source (38) at high tide during the high tide and to secure the multi-stage minimum water level water source (41) at low tide. The multi-stage high water level water source (39) and the multi-stage minimum water level water source (41) are secured according to the level of the tide level even when it is not in the high tide period. Then, only the water supply of the highest water level (42) in the multistage tank is used as the multistage highest water level (38), and only the drainage of the lowest water level (45) in the multistage tank is used as the multistage lowest water level (41). We save water source by things. This method is effective in an environment where it is difficult to obtain a high water level difference to secure a water source regardless of tidal level power generation.

In order to perform the above-described contents in conjunction with the present invention, it is natural that human control is impossible. An electronic control unit that comprehensively manages the drive control and sensor information of the water supply / drainage valve, air supply / exhaust valve, turbine, etc. is required.

In the tide difference power generation as shown in FIG. 25, a large number of devices are not used as in the above invention, but a power generation tank is placed in the sea, the underwater part is opened, and power is generated only by raising and lowering the tide level. It is bad, and you can get a large amount of electricity only during the spring tide, but if it is an additional function of the coastal facility, it will be practical.

The power generation tank (1) is installed where there is a water source with two water level differences, so that the upper tank level is lower than the lower water level. A water supply valve (3) is installed in the water of the high water level water source (5), and a drain valve (4) is installed in the water of the low water level water source (6). The power generation turbine (2) is placed above the power generation tank (1).

A power generation turbine (2) is placed between the intake port of the power generation tank (8) that is full and depressurized and the exhaust port of the power generation tank (9) that is depressurized and low in water.

Pressure tank for control The structure is the same as that of the embodiment of the invention. The upper part of the pressure tank for control (10) and the pressure reduction tank for control (11) is changed from the turbine for power generation (2) to the air valve (16). . The drive pipe (13) is piped from the inside of the drive cylinder section (14) of the piston cylinder structure slide valve (15). Connect this drive pipe (13) to an air valve (16) that has been pressurized and decompressed on water. Attach the water surface maintenance tank (17) to the water surface position of the drive pipe (13).

The water in the pressure-increasing control decompression tank (18) and the water in the pressure-increasing control pressurizing tank (19) are connected, and the exhaust port of the pressure-increasing control tank (10) is connected to the intake of the pressure-increasing control decompression tank (18). Connect the exhaust port of the pressure increase tank (19) for pressure increase control to the pressure gauge.

The pressure passage 2 (55) and the pressure passage 3 (56) in the opposite direction to the pressure passage 1 (54) of the slide valve (15) are cut in half in both directions perpendicular to the slide direction of the slide valve (15). Arrange evenly by area. That is, because both the pressure input passage (22) and the pressure output passage (23) exist on one side of the slide valve (15), the pressure input / output passage piping is shaped to surround the slide valve (15). . Next, the position detection device is arranged so that the pressure detection port (25) and the position detection pressure bypass hole (24) overlap the specified position of the slide valve (15). The drive source of the slide valve (15) is controlled by the method of the embodiment 0021 of the invention. Next, in the structure for preventing runaway of the slide valve (15), a cylinder static pressure bypass port (26) is arranged so that the pressure of the drive unit cylinder (14) is released at the specified position. Next, the anti-collision structure of the slide valve (15) is configured so that there is no passage of pressure between the drive cylinder portion (14) and the slide valve (15) from the specified position.

The water flow is blocked by the circular arc surface of the fan column pressure valve opening / closing part (27), and it rotates on the rotation axis of the fan column pressure valve support part (28) to support the water pressure. The fan-shaped buried part has a piston-cylinder structure. The open / close lubrication device for the large flow type slide valve (52) is provided with a fan column pressure valve opening / closing part (27) so as to close the low pressure side space of the large flow type slide valve (52), The pressure path of the embodiment 0023 is piped.

Due to the seesaw principle, the sluice closing part (29) and the sluice weight balance part (31) are weight balanced by the sluice rotation part (30). Piston cylinder structure is formed by sluice weight balance part (31) and drive cylinder part (14). A drive pipe (13) is piped to the drive cylinder section (14). Moreover, the sluice closing part (29) and the sluice rotation part (30) are comprised with the raw material and structure close | similar to the specific gravity of seawater or water, and a sluice weight balance part (31) is abbreviate | omitted.

  The multi-stage maximum water level water source (38) of the multi-stage water source power generation tank (53) is supplied by the maximum water level water source water supply valve (46). The multi-stage high water level water source (39) is supplied by a high water level water source water supply valve (47). The multistage low water level water source (40) is drained by a low water level water source drain valve (48). The multi-stage lowest water level water source (41) is arranged to drain by the lowest water level water source drain valve (49).

Place the power generation tank (1) in the sea and open the sea.

The invention's effect

  New power generation methods can increase the range of natural energy use.

  Power generation diagram during drainage using a power generation tank   Power generation diagram during water supply using power generation tank   Hydroelectric power generator with two power generation tanks   Pressurized underwater drive control diagram   Decompression underwater drive control diagram   Booster diagram with three tanks   Illustration of slide valve not opening due to pressure   A sketch of the water flow of the slide valve   Water flow and pressure when the slide valve is open   Water flow and pressure diagram when slide valve is closed   Slide valve drive controller diagram   Position sensor diagram for underwater control   Limiter diagram for underwater control   Underwater control collision prevention diagram   Layout of fan column pressure valve   Operational diagram of fan column pressure valve   Operational diagram of fan column pressure valve that assists in opening and closing the slide valve   Outline drawing of sluice gate with weight balance structure   Operation diagram of sluice with weight balance structure   Opening operation diagram of sluice gate with weight balance structure   Closed operation diagram of sluice gate with weight balance structure   Action diagram of shock absorption when closing a sluice gate with weight balance structure   A sketch of the on-off valve without the weight balance structure   Water level diagram of power generation tank of multistage water source   Equipment diagram that generates electricity only by changing the water level at high tide and low tide

Explanation of symbols

1, Power generation tank 2, Power generation turbine 3, Water supply valve 4, Drain valve 5, High water level water source 6, Low water level water source 7, Water level in power generation tank 8, Power generation tank 9 in full and depressurized state Pressure generating tank 10, control pressurized tank 11, control decompression tank 12, control tank water level 13, drive pipe 14, drive cylinder section 15, slide valve 16, air valve 17, water surface maintenance tank 18 , Pressure increase control decompression tank 19, pressure increase control pressurization tank 20, water level 21 upon completion of pressure increase / decrease, inter-tank water passage control valve 22, pressure input passage 23, pressure output passage 24, position detection pressure bypass hole 25, Pressure detection port 26, cylinder static pressure bypass port 27, fan column pressure valve opening / closing unit 28, fan column pressure valve support unit 29, sluice gate closing unit 30, sluice rotary unit 31, sluice weight balance Part 32, sluice closing shock absorber 33, pressure control and pressure release part 34, increased water level side water source 35, reduced water level side water source 36, sluice closed part parallel side plate 37, pressure sealing bit 38, multistage maximum water level water source 39 , Multi-stage type high water level water source 40, multi-stage type low water level water source 41, multi-stage type low water level water source 42, multi-stage type tank high water level surface 43, multi-stage type tank high water level water level 44, multi-stage type tank low water level water level 45, multi-stage type Water level valve 46 for the highest water level, water supply valve 48 for the high water level water source, drain valve 49 for the low water level water source, drain valve 50 for the lowest water level water source, water level 51 at high tide, water level 52 at low tide, Large flow type slide valve 53, multistage water source power generation tank 54, pressure passage 1
55, pressure passage 2
56, pressure passage 3

Claims (17)

In hydropower generation with two water sources, a power generation tank is placed in the high and low water range, a water supply valve is provided in the high water level, a drainage valve is provided in the low water level, and the upper part of the power generation tank. A turbine for power generation is connected to the air supply / exhaust port. When water is supplied, the water supply valve is opened and the drain valve is stopped. When draining, stop the water supply valve and stop the drain valve. A device that performs hydroelectric power generation by rotating the turbine for power generation according to the change in atmospheric pressure in the tank during water supply and drainage. 2. The power generation apparatus according to claim 1, wherein a power generation turbine is arranged while the supply and exhaust ports of the two power generation tanks are connected, and hydroelectric power generation is performed so that water supply and drainage of the two power generation tanks are reversed. . 3. The apparatus according to claim 1, wherein the pressure control is performed by using a tank having the same principle as that of the power generation tank according to claim 1 and utilizing a pressure from a supply / exhaust port of the tank. In the power generation tank and the control tank according to claim 1, claim 2 and claim 3, using two tanks of the same principle as the power generation tank according to claim 1, one valve is full and all valves are closed. Then, a combination of the state of the tank that has already been drained and the valves are all closed, and two submersible waters are connected. A device connected to the tank of claim 1 to increase pressure by a combination of intake ports. Furthermore, the apparatus which increases pressure by combining two tanks which connected the underwater of this claim in multiple stages. In the pressure-increasing and depressurization driving of the underwater device with the pipe driven by the pressure according to claim 3, the water surface position of the drive pipe is prevented in order to prevent the water level in the pipe from moving up and down by moving the underwater device and reducing the pressure sent to the driving device. A device that reduces the movement of the water surface in the pipe during pressure driving by increasing the volume in the pipe. 6. The pressure on / off valve drive according to claim 3, wherein the pressure on / off valve has a multi-directional pressure inlet / outlet path, and the pressure vector applied to the pressure on / off portion at the time of opening / closing is balanced according to the size and direction of the pressure inlet / outlet path. A pressure valve lubrication drive device in liquid and gas, in which friction at the time of opening and closing is reduced and not specified for the control application of claim 1. In the pressure driving according to claim 3, claim 4, claim 5, and claim 6, the shape constructed in the pressure driving portion and the pressure non-driving portion is in a state of closing the mouth of the detection pipe except at the detection position. In this case, a change in pressure is detected on the water by connecting the mouth of the detection pipe to the water at a position where it is desired to detect the rotation or movement of the drive unit. Position detector. The pressure driving device according to any one of claims 3, 4, 5, 6, and 7 is driven at a position where it is desired to stop even if pressure is applied, in a shape applied to a driving part or a non-driving part. The drive unit can be stopped by a structure in which the pressure is bypassed from the inside of the cylinder structure to the outside water by the rotation and movement of the part, and the pressure driven stationary in water not specified for the control application of claim 1 apparatus. In claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, claim 10, claim 11, claim 13, the shock at the time of underwater drive contact is alleviated. The pressure sealing structure is made just before the drive part comes in contact, and the volume of the pressure sealing structure and the amount of leakage from the pressure sealing structure are set in the installed shape to reduce the contact speed of the drive part and reduce the impact. A shock absorber in liquid not specified for the control application according to claim 1. In claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, claim 9, claim 12, claim 13, and claim 14, the water pressure at the rotation axis of the fan column. The pressure valve in the liquid which does not specify the use of the control of Claim 1 which block | closes the pressure of water with the circular arc surface of a fan pillar, and performs drive control with the piston structure of the rotation direction of a fan pillar. In claim 3, claim 5, claim 6, claim 7, claim 8, claim 9, claim 10, claim 13, claim 14, the pressure of the structure that covers from the high pressure side When the valve is opened, a pressure tight chamber is temporarily formed between the fan-shaped on-off valve of claim 10 and the pressure valve from the high pressure side or the low pressure side of the pressure valve, and the pressure valve is controlled by controlling the pressure in the pressure tight chamber. A pressure valve lubrication switching device in liquid which is easy to open and close and which is not specified for the control application of claim 1. The open / close valve according to claim 1, having a seesaw structure, having an open / close function of water supply / drainage on one side of the seesaw, and balancing the weight on the opposite side of the seesaw. The underwater switchgear which is not specified for the application according to claim 1, wherein the side moves in response to water pressure and water flow, and can open or close the water supply or drainage flow in one direction. The underwater switchgear which does not specify the use of Claim 1 with the apparatus which comprised the piston cylinder structure on the balance side of the weight of Claim 12, and enabled control by pressure. In claim 13, the pressure control has the function of claim 12 by releasing the pressure of the pressure switching valve, the pressure switching valve is connected to the pressure control side, and both functions of claim 13 coexist. The underwater switchgear which is not specified for the use of Claim 1. In claim 12, the opening / closing operation is specified in the liquid, and the material and the cavity structure constituting the opening / closing valve are made close to the specific gravity of the liquid, thereby omitting the weight-balancing portion of claim 12. An on-off valve composed of only a part and a rotating shaft, the on-off function side moves in response to water pressure and water flow, and can perform water supply or drainage flow in one direction by natural opening and closing, and is not specified for use in claim 1 Underwater switchgear. In the means for ensuring the difference in water level of the water source for power generation according to claim 1, claim 2, and claim 4, water sources with different water level differences are secured step by step in accordance with environmental changes, and Water source conserving device that saves water source with high water level difference by switching the water source to supply and drain according to the water level in the tank. A tide difference power generation apparatus that generates electricity only by raising and lowering the tide level with the power generation tank according to claim 1 placed in the sea and the undersea portion opened.

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