A system and control method for water body rotation, drainage energy storage and power generation

Abstract

The present invention provides a system and a control method for water body rotation, drainage energy storage and power generation. During the water intake when generating power by water head and the process of emptying the water body in the caisson during energy storage, the water body in the caisson is rotated through a diversion pipeline to generate kinetic energy for energy storage. Due to the viscous force of water, the angular velocity and kinetic energy of the water body are reduced. Therefore, the bottom, wall of the frustum-shaped caisson and the water body are separated by gas to overcome the viscous force of water and increase the kinetic energy of the water body. At the same time, the cavitation jet bubble technology is adopted to overcome the biological parasitism of the water body, improve the stability of the caisson and the energy storage output power density of the caisson, and solve the problem of improving the drainage energy storage power density of each single underwater caisson. The rotational kinetic energy of the water body and the power generation of the water turbine quickly support the power grid and improve the energy storage power density of the caisson.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage, and particularly relates to a system and control method for water body rotation, drainage energy storage and power generation. Background Art

[0002] With the rapid development of new energy, the importance of energy storage has become prominent. As is well known, the uncertainty and instability of photovoltaic and wind power generation cause fluctuations in the power grid, resulting in large-scale curtailment of wind and light. This causes huge losses to large-scale power stations, especially serious in the northwestern region. However, existing energy storage methods have their own characteristics. For example, pumped-storage energy storage, compressed air energy storage, and chemical energy storage are good solutions. Pumped-storage energy storage has the characteristics of large power and long discharge time, with an efficiency between 60% and 70%. Pumped-storage power stations are important regulating tools in the power system, with the advantages of flexible start-up and fast regulation speed. They are peak-shaving power sources and energy storage power sources with mature technology, reliable operation and relatively low cost. A method similar to "pumped-storage energy storage", "underwater caisson drainage energy storage", drains the water in the underwater caisson by the surplus electricity generated by new energy power generation that cannot be transmitted out. When power supply is needed, the water turbine generator on the caisson is driven by the water depth pressure. It is the reverse process of "pumped-storage energy storage". It is beneficial to offshore wind power, floating photovoltaic, ocean tidal power generation, etc. For energy storage in the ocean, lakes, etc., the stability of new energy output is ensured through energy storage scheduling.

[0003] Due to considerations of the buoyancy, installation and cost of underwater caisson drainage energy storage, the single unit capacity is not easy to be too large. Therefore, it is very important to improve the power density of each single underwater caisson for drainage energy storage. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a system and control method for water body rotation, drainage energy storage and power generation. By using the process of water inlet during hydropower generation and emptying the water body in the caisson during energy storage, the water body in the caisson is rotated through a diversion pipeline, while overcoming the biological parasitism of the water body, the viscous force of the frustum-shaped caisson bottom and the caisson wall of the rotating water body, thereby improving the stability of the caisson and the power density of the caisson energy storage output.

[0005] Since the internal and external water bodies of the underwater caisson drainage energy storage are separated from each other, when there is water inlet during power generation and the water body in the caisson is emptied during energy storage. When a frustum-shaped caisson structure and a specific diversion pipeline water inlet and drainage method are selected, the water body in the frustum-shaped caisson rotates.

[0006] Therefore, a water turbine power generation outlet pipe is arranged along the direction of the caisson wall inside the frustum-shaped caisson. Under the action of the kinetic energy of the water body flowing out from the water turbine power generation inside the frustum-shaped caisson, the water body rotates along the caisson wall. Similarly, during energy storage and discharge, a water pump pumping guide inlet pipe is arranged along the direction of the caisson wall inside the frustum-shaped caisson to discharge the water body inside the frustum-shaped caisson. During the process of discharging the water body, the water body inside the frustum-shaped caisson has a tendency to rotate under the action of the water flow. If the water body is continuously and irregularly filled and drained to maintain rotation, and if a certain mass of impellers with the same axis as the water body rotation in the horizontal direction is added to the bottom inside the frustum-shaped caisson, the water body rotation can drive power generation just like a fan.

[0007] Due to the viscous force of water reducing the angular velocity ω of the water body rotation, according to the rotational kinetic energy formula Therefore, the viscous force greatly reduces the rotational kinetic energy E of the water body 水 , so that the water body can generate electricity like a fan and store energy in a flywheel by overcoming the viscous force of water. When the new energy generation is insufficient instantaneously, it can quickly support the power grid. Therefore, effectively obtaining this kinetic energy can increase the energy storage power density of the caisson.

[0008] In addition, aquatic organisms have a great impact on the inner wall of the caisson, increasing the frictional resistance of the water body rotation. Therefore, regular cleaning of aquatic organisms is also a very important link. Therefore, the internationally latest underwater cleaning technology for marine organisms, "cavitation jet technology", is adopted. This technology can effectively clean the marine organisms on different types of ships, offshore oil platforms, docks, underwater pipelines and other facilities.

[0009] To achieve the above object, the technical solution adopted by the present invention is:

[0010] A system for water body rotation, drainage energy storage and power generation, comprising a frustum-shaped caisson energy storage unit, a power generation unit, a biological cleaning unit, and a water body rotation drag reduction unit;

[0011] The frustum-shaped caisson energy storage unit is located in a water body of a certain scale and depth; the power generation unit is located at the top cover and near the bottom of the frustum-shaped caisson; the biological cleaning unit is located inside the frustum-shaped caisson and floats coaxially with the frustum-shaped caisson on the water body; the water body rotation drag reduction unit is located inside and outside the frustum-shaped caisson.

[0012] Furthermore, the frustum-shaped caisson energy storage unit includes: a frustum-shaped caisson and a pump / turbine integrated machine; wherein, the inside of the frustum-shaped caisson is a frustum-shaped structure with a smaller upper part and a larger lower part, and several inverted stepped air chamber belts are distributed horizontally along the inner wall from bottom to top. Each inverted stepped air chamber belt is separated by an air chamber partition, which is conducive to the attachment of air bubbles along the inner wall of the frustum-shaped caisson and storage in each inverted stepped air chamber belt; when each inverted stepped air chamber belt is filled with gas, the gas will separate the rotating water body from the inner wall of the frustum-shaped caisson, reducing the viscous resistance between the water body and the inner wall of the frustum-shaped caisson; the pump / turbine integrated machine is located at the bottom outside of the frustum-shaped caisson, and the pump / turbine integrated machine is connected to the water inlet and outlet pipes. The other end of the water inlet and outlet pipes is located above the external water body of the frustum-shaped caisson to prevent the disturbance of the bottom water body during energy storage power generation for water inlet and outlet. The other end of the pump / turbine integrated machine is respectively connected to the drainage and diversion pipeline penetrating the bottom of the frustum-shaped caisson and the water turbine outlet diversion pipeline; wherein, the drainage and diversion pipeline is laid along the inner wall of the frustum-shaped caisson. When there is surplus power generated by new energy power generation that cannot be transmitted out, the water and aquatic organisms in the frustum-shaped caisson are discharged through the pump of the pump / turbine integrated machine to provide a power generation space for the water turbine. At the same time, under the action of the inlet water flow in the drainage and diversion pipeline, the water body rotates. The top cover of the frustum-shaped caisson is provided with a communication channel with the atmosphere, and the gas in the frustum-shaped caisson is communicated with the atmosphere through the atmosphere communication pipeline and the atmosphere exhaust valve.

[0013] Furthermore, the power generation unit includes: a water turbine and an impeller generator set. Among them, the water turbine is a pump / turbine integrated machine placed at the bottom outside of the frustum-shaped caisson. One end of the water turbine outlet diversion pipeline is connected to the water turbine outlet, and the other end passes through the bottom wall near the frustum-shaped caisson and is laid along the inside of the frustum-shaped caisson to control the water flow to flow along the inner wall of the frustum-shaped caisson. While the water turbine generates electricity, the water body in the frustum-shaped caisson rotates, driving the impeller platform to rotate and driving the impeller generator set to generate electricity.

[0014] Further, the impeller generator set includes: an electric / generator, a main shaft, and an impeller platform; the main shaft is coaxial with the frustum-shaped caisson and penetrates through the top cover of the frustum-shaped caisson, with the electric / generator installed at the upper end, and the lower end is connected to the inner bottom of the frustum-shaped caisson through a bearing. Inside the frustum-shaped caisson, a floating cavitation jet bubble gun penetrates through, and also penetrates through the center of the impeller platform and is fixedly connected to the main shaft near the bottom; the impeller platform includes: an impeller tray and an impeller group. Among them, inside the impeller tray is the impeller tray air chamber. The upper end of the main shaft penetrates through the center of the impeller tray and is connected at a position near the bottom of the main shaft. The impeller group is evenly vertically distributed and installed between the impeller tray and the main shaft and connected; among them, the impeller group rotates the impeller platform under the drive of water flow; through the gas in the impeller tray air chamber at the lower part of the impeller tray, the impeller platform is separated from the water body below, reducing the viscous force between the water body and the bottom of the impeller platform, and by controlling the gas overflow at the edge of the impeller tray, gas is provided for the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson. Since the frustum-shaped caisson is a frustum structure with a smaller upper part and a larger lower part, it is beneficial for the gas overflowing from the edge of the impeller tray to rise along the inner wall of the frustum-shaped caisson and fill the inverted stepped air chamber belt immersed in the water body, isolating the water body from the inner wall of the frustum-shaped caisson and reducing the viscous force between the water body and the inner wall of the frustum-shaped caisson.

[0015] Further, the biological cleaning unit includes a floating cavitation jet bubble gun, which floats on the water surface. The main shaft penetrates through the center of the floating cavitation jet bubble gun, floating up and down and rotating with the water body. The floating cavitation jet bubble gun jets cavitation bubbles to scan and clean the aquatic organisms on the inner wall of the frustum-shaped caisson. The cleaned aquatic organisms fall to the edge of the impeller platform under the action of the centrifugal force and gravity of the rotating water body. When passing through the pumping and drainage diversion pipeline opening, they are discharged through the water pump under the action of the water flow.

[0016] Further, the water body rotation drag reduction unit includes: an air compressor, an airbag, and a compressed gas exhaust pipeline; the air compressor is placed on the outer top of the frustum-shaped caisson. The air inlet pipe of the air compressor penetrates through the top cover of the frustum-shaped caisson and is connected to the gas inside the frustum-shaped caisson; the air compressor is connected to the airbag through the compressed gas exhaust pipeline; the compressed gas in the airbag is discharged into the impeller tray air chamber at the lower part of the impeller tray through the compressed gas control valve via a pipeline. Under the control of the compressed gas control valve, gas is respectively provided for the impeller tray air chamber at the lower part of the impeller tray and the gas overflowing from the impeller tray air chamber, providing attached gas for several inverted stepped air chamber belts on the inner wall of the frustum-shaped caisson. Since the gas in the impeller tray air chamber at the bottom of the impeller tray and several inverted stepped air chamber belts are immersed in the water body and are sealed by the water body, the gas consumption for overcoming the viscous force between the water body and the inside of the frustum-shaped caisson is relatively small; the air compressor further compresses the compressed gas in the frustum-shaped caisson into the airbag, greatly improving the efficiency of the air compressor.

[0017] The present invention also provides a control method for a system of water body rotation, drainage energy storage and power generation, comprising the following steps:

[0018] Initial state: The frustum-shaped caisson and the airbag are placed at a certain water depth. The frustum-shaped caisson is in an empty state. There is a certain amount of gas in the airbag. The atmosphere exhaust valve of the frustum-shaped caisson is closed.

[0019] Step 1, in the power generation state:

[0020] Step 1.1 When the system of water body rotation combined with drainage energy storage and power generation enters the power generation state, the water turbine starts to generate electricity under the action of the water head pressure. The water flow enters the frustum-shaped caisson and rotates along the wall of the frustum-shaped caisson. At the same time, a certain power is given to the impeller platform driven by the motor, and the impeller platform is controlled to rotate synchronously with the water flow. After reaching the basic speed, the motor quits working, and at the same time, the water jump phenomenon is reduced. When the water level reaches the impeller platform, that is, when the water level submerges the impeller tray air chamber, start the airbag and, under the control of the compressed gas control valve, fill the impeller tray air chamber below the impeller platform with gas through the compressed gas exhaust pipeline, separating the impeller platform from the water body at the bottom of the frustum-shaped caisson, and reducing the viscous force of water to accelerate the rotation of the water body.

[0021] Step 1.2 As the power generation of the water turbine increases and the water level in the frustum-shaped caisson reaches a certain height, the airbag, under the control of the compressed gas control valve, synchronously fills the impeller tray air chamber with gas through the compressed gas exhaust pipeline, and the gas overflows from the impeller tray air chamber and gradually rises along the inner wall of the frustum-shaped caisson, filling the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson at the same water level. At this time, the gas is enclosed in the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson by the water body, separating the water body from the bottom and inner wall of the frustum-shaped caisson, and reducing the viscous force of water to accelerate the rotation of the water body and the impeller platform;

[0022] Step 1.3 As the power generation of the water turbine increases and the water level in the frustum-shaped caisson reaches a certain height, since the atmosphere exhaust valve of the frustum-shaped caisson is closed, the gas pressure in the upper part of the water body in the frustum-shaped caisson increases. When the pressure difference with the water head approaches the power generation power pressure required by the water turbine, start the air compressor to compress the gas in the upper part of the water body in the frustum-shaped caisson into the airbag, releasing the pressure in the frustum-shaped caisson.

[0023] Step 1.4 When the gas in the airbag reaches the limit, close the air compressor, open the atmosphere exhaust valve to provide a larger power generation space for the water turbine, and the water flow power generation continuously drives the rotation of the water body to generate kinetic energy. At the same time, the airbag, under the control of the compressed gas control valve, provides gas for the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson at the same water level, ensuring that the water body is separated from the bottom and inner wall of the frustum-shaped caisson;

[0024] Step 2, when storing the surplus electricity generated by the new energy power generation that cannot be transmitted externally:

[0025] Step 2.1 When there is residual electricity, start the water pump to drain the water in the frustum-shaped caisson through the drainage diversion pipeline. At this time, the water body continues to drive the water body and the impeller platform to rotate under the kinetic energy of the water flow pumped by the water pump; at the same time, the floating cavitation jet bubble gun rotates with the water body to regularly clean the organisms on the inner wall of the frustum-shaped caisson; when the organisms washed down are under the action of centrifugal force and pass through the water inlet of the drainage diversion pipeline, the dirt is discharged.

[0026] Step 2.2 As the water body in the frustum-shaped caisson is drained and the water level drops, when the water level reaches the appropriate height, the gas in the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson above the same height is released; when the water level reaches the impeller platform, stop the water pump to ensure that the gas in the impeller tray air chamber is sealed by the water body, reducing the viscous resistance between the impeller platform and the water body at the bottom of the frustum-shaped caisson.

[0027] Step 2.3 If there is residual electricity, start the motor to accelerate the speed of the impeller platform; when there is no residual electricity, the impeller platform uses its weight inertia to maintain rotation.

[0028] Step 2.4 When rapid support for the power grid is required, start the generator to generate electricity, and the inertial kinetic energy of the impeller platform drives the generator to generate electricity.

[0029] Step 2.5 When the rotation speed of the impeller platform drops to a certain level, start the water turbine to generate electricity and enter the power generation state. The water turbine starts to generate electricity under the action of the head pressure, and the water flow enters the frustum-shaped caisson and drives the water body and the impeller platform to continue rotating.

[0030] Beneficial effects:

[0031] 1) Solve the problem of high geological requirements compared with pumped-storage power stations;

[0032] 2) Do not occupy land area;

[0033] 3) Have no disturbance to the ecology in the middle and lower parts of the water body;

[0034] 4) Provide on-site energy storage for offshore floating wind power and photovoltaic power and rapid support for the power grid;

[0035] 5) The combination of water body kinetic energy + impeller platform + water turbine power generation improves the energy storage power density of the caisson;

[0036] 6) The rotational kinetic energy of the water body in the caisson is the same as that of a gyroscope, improving the stability of the caisson;

[0037] 7) The power generation of the impeller platform responds faster than that of a flywheel generator and can provide rapid and stable support for the power grid. Description of the Drawings

[0038] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0039] Figure 1System structure diagram of a water body rotation, drainage energy storage and power generation system of the present invention;

[0040] Figure 2 It is a diagram showing the structural relationship between the upward-looking impeller platform and the airbag;

[0041] Figure 3 It is the structure of a floating cavitating jet bubble gun;

[0042] Figure 4 It is a sectional view of a frustum-shaped caisson structure.

[0043] Among them, there are a frustum-shaped caisson 1, an electric / generator 2, a main shaft 3, an air compressor 4, a compressed gas exhaust pipe 5, an air compressor intake pipe 6, a cavitating jet bubble 7, a floating cavitating jet bubble gun 8, a bubble gun muzzle 9, a central hole 10, a water pump / water turbine integrated machine 11, an intake and drainage pipe 12, a top cover 13, an impeller group 14, a pumping and drainage diversion pipe 15, an atmospheric connection pipe 16, an impeller platform 17, an impeller tray 18, an inverted stepped air chamber belt 19, an air chamber partition 20, a water turbine outlet diversion pipe 21, a bearing 22, a compressed gas exhaust pipe 23, a compressed gas outlet 24, a compressed gas control valve 25, an airbag 26, an impeller tray air chamber 27, an outer bottom 28, a water body 29, and an atmospheric exhaust valve 30. Specific embodiments

[0044] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] As shown in Figure 1 、 2 、3, and 4, a water body rotation, drainage energy storage and power generation system of the present invention mainly includes: a frustum-shaped caisson energy storage unit, a power generation unit, a biological cleaning unit, and a water body rotation drag reduction unit.

[0046] Among them, the frustum-shaped caisson energy storage unit is located in a water body of a certain scale and depth; the power generation unit is located on the top cover 13 of the frustum-shaped caisson 1 and near the outer bottom 28; the biological cleaning unit is located inside the frustum-shaped caisson 1 and floats coaxially with the frustum-shaped caisson 1 on the water body 29; the water body rotation drag reduction unit is located inside and outside the frustum-shaped caisson 1.

[0047] The frustum-shaped caisson energy storage unit mainly includes: a frustum-shaped caisson 1 and a water pump / water turbine integrated machine 11. As shown in Figure 4As shown in the figure, the frustum-shaped caisson 1 has a frustum-shaped structure that is smaller at the top and larger at the bottom inside. Along the inner wall in the horizontal direction, several inverted stepped air chamber belts 19 are distributed from bottom to top. Each inverted stepped air chamber belt 19 is separated by an air chamber partition 20, which is conducive to bubbles adhering to the inner wall of the frustum-shaped caisson 1 and being stored in each inverted stepped air chamber belt 19. When each inverted stepped air chamber belt 19 is filled with gas, the gas will separate the rotating water body 29 from the inner wall of the frustum-shaped caisson 1, reducing the viscous resistance between the water body 29 and the inner wall of the frustum-shaped caisson 1. The water pump / water turbine integrated machine 11 is located at the outer bottom 28 of the frustum-shaped caisson 1. The water pump / water turbine integrated machine 11 is connected to the water inlet and outlet pipeline 12, and the other end of the water inlet and outlet pipeline 12 is located at the upper part of the water body outside the frustum-shaped caisson 1 to prevent the disturbance of the bottom water body during the water inlet and outlet of energy storage power generation. The other end of the water pump / water turbine integrated machine 11 is respectively connected to the drainage and pumping diversion pipeline 15 and the water turbine outlet diversion pipeline 21 that penetrate the outer bottom 28 of the frustum-shaped caisson 1. Among them, the drainage and pumping diversion pipeline 15 is laid along the inner wall of the frustum-shaped caisson 1. When there is surplus electricity generated by new energy power generation that cannot be transmitted externally, the water pump of the water pump / water turbine integrated machine 11 discharges the water and aquatic organisms in the frustum-shaped caisson 1, providing power generation space for the water turbine of the water pump / water turbine integrated machine 11. At the same time, under the action of the water flow entering the drainage and pumping diversion pipeline 15, the water body 29 rotates. The top cover of the frustum-shaped caisson 1 is provided with a channel communicating with the atmosphere, and the gas in the frustum-shaped caisson 1 is communicated with the atmosphere through the atmosphere connecting pipeline 16 and the atmosphere exhaust valve 30.

[0048] The described power generation unit mainly includes: a water turbine and an impeller generator set. Among them, the water turbine is a water pump / water turbine integrated machine 11 placed at the outer bottom 28 of the frustum-shaped caisson. One end of the water turbine outlet diversion pipeline 21 is connected to the water turbine outlet, and the other end passes through the wall near the outer bottom 28 of the frustum-shaped caisson 1 and is laid along the inside of the frustum-shaped caisson 1 to control the water flow to flow along the inner wall of the frustum-shaped caisson 1. While the water turbine generates electricity, the water body 29 in the frustum-shaped caisson 1 rotates, driving the impeller platform to rotate and driving the impeller generator set to generate electricity.

[0049] The impeller generator set includes: an electric / generator 2, a main shaft 3, and an impeller platform 17. The main shaft 3 is coaxial with the frustum-shaped caisson 1 and penetrates through the top cover 13 of the frustum-shaped caisson 1. The electric / generator 2 is installed at the upper end, and the lower end is connected to the bottom 28 of the inner and outer surfaces of the frustum-shaped caisson 1 through a bearing 22. Inside the frustum-shaped caisson 1, a floating cavitation jet bubble gun 8 penetrates through, and it also penetrates through the center of the impeller platform 17 and is fixedly connected to the bottom of the main shaft 3 near the main shaft 3. The impeller platform 17 includes: an impeller tray 18 and an impeller group 14. Among them, the impeller tray 18 is like an inverted vertical-edge tray, and inside the inverted vertical-edge tray is an impeller tray air chamber 27. The upper end of the main shaft 3 is installed to penetrate through the center of the impeller tray 18 and is connected at a position near the bottom of the main shaft 3. The impeller group 14 is evenly and vertically distributed and installed between the impeller tray 18 and the main shaft 3 and is connected. Among them, the impeller group 14 drives the impeller platform 17 to rotate under the action of water flow; since the density of water is 800 times that of air, the gas in the impeller tray air chamber 27 below the impeller tray 18 separates the impeller platform 17 from the water body 29 below, reducing the viscous force between the water body 29 and the bottom of the impeller platform 17, and by controlling the gas overflow at the edge of the impeller tray 18, the gas in the inverted stepped air chamber belt 19 on the inner wall of the frustum-shaped caisson 1 is provided. Since the frustum-shaped caisson 1 is a frustum structure with a smaller upper part and a larger lower part, it is beneficial for the gas overflowing from the edge of the impeller tray 18 to rise along the inner wall of the frustum-shaped caisson 1 and fill the inverted stepped air chamber belt 19 immersed in the water body 29, isolating the water body 29 from the inner wall of the frustum-shaped caisson 1 and reducing the viscous force between the water body 29 and the inner wall of the frustum-shaped caisson 1.

[0050] The described biological cleaning unit mainly includes: a floating cavitation jet bubble gun 8. Among them, the floating cavitation jet bubble gun 8 floats on the surface of the water body 29. The main shaft 3 penetrates through the central hole 10 of the floating cavitation jet bubble gun 8 and can float up and down and rotate with the water body 29. The floating cavitation jet bubble gun 8 generates cavitation jet bubbles 7 through the bubble muzzle 9 and scans and cleans the aquatic organisms on the inner wall of the frustum-shaped caisson 1. The cleaned aquatic organisms fall to the edge of the impeller platform 17 under the action of the centrifugal force and gravity of the rotating water body. When passing through the port of the pumping and drainage diversion pipeline 15, they are discharged through a water pump under the action of the water flow.

[0051] The described water body rotation drag reduction unit mainly includes: an air compressor 4, an airbag 26, and a compressed gas exhaust pipeline 23. The air compressor 4 is placed on the outer top of the frustum-shaped caisson 1. The air inlet pipe 6 of the air compressor passes through the top cover 13 of the frustum-shaped caisson and is connected to the gas inside the frustum-shaped caisson 1. The air compressor 4 is connected to the airbag 26 through the compressed gas exhaust pipeline 5. The compressed gas in the airbag 26 passes through the compressed gas control valve 25 and is discharged into the impeller tray air chamber 27 below the impeller tray 18 through the compressed gas exhaust pipeline 23. Under the control of the compressed gas control valve 25, the gas in the impeller tray air chamber 27 below the impeller tray 18 and the overflow gas of the impeller tray air chamber 27 are respectively provided to provide attached gas for several inverted stepped air chamber belts 19 on the inner wall of the frustum-shaped caisson 1. Since the gas in the impeller tray air chamber at the bottom of the impeller tray 18 and several inverted stepped air chamber belts 19 are immersed in the water body and are sealed by the water body, the gas consumption for overcoming the viscous force between the water body and the inside of the frustum-shaped caisson 1 is relatively small.

[0052] Among them, the air compressor 4 further compresses the compressed gas in the frustum-shaped caisson 1 into the airbag 26, greatly improving the efficiency of the air compressor 4.

[0053] The basic principle of the present invention is:

[0054] Since the water bodies inside and outside the frustum-shaped caisson are separated from each other, when the water body in the frustum-shaped caisson is filled during power generation and emptied during energy storage, the water body in the caisson can be rotated through the diversion pipeline. For example, if a water turbine power generation outlet pipe is arranged along the caisson wall inside the frustum-shaped caisson, the water body inside the frustum-shaped caisson rotates along the caisson wall under the action of the kinetic energy of the water turbine power generation outlet water. Similarly, during energy storage and discharge, the water pump discharges the water body inside the frustum-shaped caisson through the guiding inlet pipe at the center of the frustum-shaped caisson. During the process of discharging the water body, the water body inside the frustum-shaped caisson has a tendency to rotate under the action of the water flow. When the water body is regularly filled and drained to maintain rotation, and then a certain mass of impellers with a horizontal direction coaxial with the water body rotation are added to the bottom inside the frustum-shaped caisson, the water body drives power generation like a wind turbine.

[0055] Since the viscous force of water reduces the angular velocity ω of the water body rotation, based on the rotational kinetic energy formula the rotational kinetic energy E of the water body 水 decreases. Therefore, through the gas filled in the vertical edge tray and the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson, the water body is separated from the inner wall and bottom of the frustum-shaped caisson, overcoming the viscous force of water. The water body can store energy like a flywheel and drive the impeller to generate power through the rotation of the water body. When the new energy generation is insufficient instantaneously, it can quickly support the power grid, and effectively obtaining this kinetic energy increases the energy storage power density of the caisson. Among them, J 水 is the moment of inertia of the water body rotation; ω is the angular velocity of the water body; E 水 is the rotational kinetic energy.

[0056] Among them, when the water turbine completes full-power power generation, the remaining frustum-shaped caisson space maintains the power output of the water current turbine at a reduced power and drives the rotational power of the water body. At this time, if the rotational speed of the impeller platform is greater than the base speed and instant power support is required, the engine responds quickly. Driven by the kinetic energy of the water body, the impeller platform drives the motor to generate electricity to support the power grid, similar to the principle of flywheel energy storage. When generating electricity, first determine the rotational speed of the impeller platform. When the rotational speed of the impeller platform is low, start the motor to drive the impeller platform to increase speed until it reaches the basic speed, while reducing the water jump phenomenon. Building the frustum-shaped caisson along the coast can reduce the buoyancy of the frustum-shaped caisson.

[0057] The control method of a water body rotation, drainage energy storage and power generation system of the present invention includes:

[0058] Initial state: The frustum-shaped caisson and the airbag 26 are placed at a certain water depth. The frustum-shaped caisson is in an empty state. There is a certain amount of gas in the airbag 26, and the atmospheric exhaust valve of the frustum-shaped caisson is closed.

[0059] Step 1, in the power generation state:

[0060] Step 1.1 When the water body rotation combined with drainage energy storage and power generation system enters the power generation state, the water turbine starts to generate electricity under the action of the head pressure. The water flow enters the frustum-shaped caisson 1 and rotates along the wall of the frustum-shaped caisson. At the same time, a certain amount of power is given to the impeller platform 17 driven by the motor, and the impeller platform 17 is controlled to rotate synchronously with the water flow. After reaching the basic speed, the motor exits the operation, and at the same time, the water jump phenomenon is reduced. When the water level reaches the impeller platform 17, that is, when the water level submerges the impeller tray air chamber 27, start the airbag 26 and, under the control of the compressed gas control valve, through the compressed gas exhaust pipeline, fill the impeller tray air chamber 27 below the impeller platform 17 with gas, separating the impeller platform 17 from the water body at the bottom 28 outside the frustum-shaped caisson 1, and reducing the viscous force of the water to accelerate the rotation of the water body.

[0061] Step 1.2 As the power generation of the water turbine increases and the water level in the frustum-shaped caisson reaches a certain height, the airbag, under the control of the compressed gas control valve, synchronously fills the impeller tray air chamber 27 with gas through the compressed gas exhaust pipeline, and the gas overflows from the impeller tray air chamber 27 and gradually rises along the inner wall of the frustum-shaped caisson 1, filling the inverted stepped air chamber belt 19 on the inner wall of the frustum-shaped caisson 1 at the same water level. At this time, the gas is enclosed in the inverted stepped air chamber belt 19 on the inner wall of the frustum-shaped caisson 1 by the water body, separating the water body 29 from the bottom 28 outside the frustum-shaped caisson 1 and the inner wall, reducing the viscous force of the water to accelerate the rotation of the water body and the impeller platform. Based on the principle of rotational kinetic energy, the rotational kinetic energy is proportional to the square of the moment of inertia of the water body and the rotational angular velocity, that is Thus, the kinetic energy of the water body is greatly increased.

[0062] Step 1.3 When the water level in the frustum-shaped caisson 1 reaches a certain height as the power generation of the water turbine increases, since the atmospheric exhaust valve 30 of the frustum-shaped caisson 1 is closed, the gas pressure in the upper part of the water body 29 in the frustum-shaped caisson 1 increases. When the pressure difference with the water head approaches the power generation power pressure required by the water turbine for power generation, start the air compressor 4 to compress the gas in the upper part of the water body 29 in the frustum-shaped caisson 1 into the airbag 26, releasing the pressure in the frustum-shaped caisson 1.

[0063] Step 1.4 When the gas in the airbag 26 reaches its limit, turn off the air compressor 4 and open the atmospheric exhaust valve to provide a larger power generation space for the water turbine. The water flow power generation continuously drives the water body 29 to rotate to generate kinetic energy. At the same time, under the control of the compressed gas control valve 25 of the airbag 26, the airbag 26 provides gas for the inverted stepped air chamber belt 19 on the inner wall of the frustum-shaped caisson 1 at the same water level height, ensuring that the water body 29 is separated from the outer bottom 28 and the inner wall of the frustum-shaped caisson 1.

[0064] Step 2. Surplus power energy storage:

[0065] Step 2.1 When there is surplus power, start the water pump to drain the water in the frustum-shaped caisson 1 through the pumping and drainage diversion pipeline 15. At this time, the water body continues to drive the water body 29 and the impeller platform 17 to rotate under the kinetic energy of the water flow pumped by the water pump. At the same time, the floating cavitation jet bubble gun 8 rotates with the water body 29 to regularly clean the organisms on the inner wall of the frustum-shaped caisson 1. When the organisms washed down enter the water inlet of the pumping and drainage diversion pipeline 15 under the action of centrifugal force, the dirt is discharged.

[0066] Step 2.2 As the water body 29 in the frustum-shaped caisson 1 is drained, the water level drops. When the water level reaches the appropriate height, the gas in the inverted stepped air chamber belt 19 on the inner wall of the frustum-shaped caisson 1 above the same height is released. When the water level reaches the impeller platform 17, stop the water pump to ensure that the gas in the impeller tray air chamber 27 is sealed by the water body, reducing the viscous resistance between the impeller platform 17 and the water body at the outer bottom 28 of the frustum-shaped caisson 1.

[0067] Step 2.3 If there is surplus power, start the motor to accelerate the speed of the impeller platform 17. Based on the kinetic energy formula The greater the rotational angular velocity, the greater the increased kinetic energy. At this time, it is in the flywheel energy storage state. When there is no surplus power, the impeller platform 17 uses the rotational inertia of the water body to maintain rotation.

[0068] Step 2.4 When rapid support for the power grid is required, start the generator to generate electricity, and the inertial kinetic energy of the impeller platform drives the generator to generate electricity.

[0069] Step 2.5 When the rotational speed of the impeller platform 17 drops to a certain level, start the water turbine to generate electricity and enter the power generation state. The water turbine starts to generate electricity under the action of the water head pressure, and the water flow enters the frustum-shaped caisson 1 and drives the water body 29 and the impeller platform 17 to continuously rotate.

[0070] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A system for water body rotation, drainage energy storage and power generation, characterized in that: it includes a frustum-shaped caisson energy storage unit, a power generation unit, a biological cleaning unit, and a water body rotation drag reduction unit; the frustum-shaped caisson energy storage unit is located in a water body of a certain scale and depth; the power generation unit is located on the top cover and near the bottom of the frustum-shaped caisson; the biological cleaning unit is located inside the frustum-shaped caisson and floats coaxially with the frustum-shaped caisson on the water body; the water body rotation drag reduction unit is located inside and outside the frustum-shaped caisson; the frustum-shaped caisson energy storage unit includes: a frustum-shaped caisson, a water pump / water turbine integrated machine; wherein, the inside of the frustum-shaped caisson is a frustum-shaped structure with a smaller upper part and a larger lower part, and several inverted stepped air chamber belts are distributed horizontally along the inner wall from bottom to top. Each inverted stepped air chamber belt is separated by an air chamber partition, which is conducive to bubbles adhering to the inner wall of the frustum-shaped caisson and being stored in each inverted stepped air chamber belt; when each inverted stepped air chamber belt is filled with gas, the gas separates the rotating water body from the inner wall of the frustum-shaped caisson, reducing the viscous resistance between the water body and the inner wall of the frustum-shaped caisson; the water pump / water turbine integrated machine is located at the bottom outside of the frustum-shaped caisson, and the water pump / water turbine integrated machine is connected to the inlet and outlet water pipes. The other end of the inlet and outlet water pipes is located at the upper part of the water body outside the frustum-shaped caisson to prevent the disturbance of the bottom water body during energy storage and power generation inlet and outlet water; the other end of the water pump / water turbine integrated machine is respectively connected to the drainage and diversion pipeline penetrating the bottom of the frustum-shaped caisson and the water turbine outlet diversion pipeline; wherein, the drainage and diversion pipeline is laid along the inner wall of the frustum-shaped caisson. When there is surplus power generated by new energy power generation that cannot be sent out, the water and aquatic organisms in the frustum-shaped caisson are discharged through the water pump of the water pump / water turbine integrated machine to provide a power generation space for the water turbine. At the same time, under the action of the inlet water flow of the drainage and diversion pipeline, the water body rotates; a channel communicating with the atmosphere is installed on the top cover of the frustum-shaped caisson, and the gas in the frustum-shaped caisson is communicated with the atmosphere through the atmosphere communication pipeline and the atmosphere exhaust valve; the power generation unit includes: a water turbine and an impeller generator set. Among them, the water turbine is a water pump / water turbine integrated machine placed at the bottom outside of the frustum-shaped caisson. One end of the water turbine outlet diversion pipeline is connected to the water turbine outlet, and the other end passes through the wall near the bottom of the frustum-shaped caisson and is laid along the inside of the frustum-shaped caisson to control the water flow to flow along the inner wall of the frustum-shaped caisson. While the water turbine generates electricity, the water body in the frustum-shaped caisson rotates, driving the impeller platform to rotate and driving the impeller generator set to generate electricity.

2. A system for water body rotation, drainage energy storage and power generation according to claim 1, characterized in that: The impeller generator set includes: an electric / generator, a main shaft, and an impeller platform; the main shaft is coaxial with the frustum-shaped caisson and passes through the top cover of the frustum-shaped caisson, with the electric / generator installed at the upper end and connected to the inner bottom of the frustum-shaped caisson through a bearing at the lower end. A floating cavitation jet bubble gun passes through the frustum-shaped caisson, and passes through the center of the impeller platform and is fixedly connected to the bottom of the main shaft near it; the impeller platform includes: an impeller tray and an impeller group. Among them, the inside of the impeller tray is an impeller tray air chamber. The upper end of the main shaft is installed through the center of the impeller tray and connected at a position near the bottom of the main shaft. The impeller group is evenly vertically distributed and installed between the impeller tray and the main shaft and connected; among them, the impeller group rotates the impeller platform under the drive of water flow; through the gas in the impeller tray air chamber at the lower part of the impeller tray, the impeller platform is separated from the water body below, reducing the viscous force between the water body and the bottom of the impeller platform, and by controlling the gas overflow at the edge of the impeller tray, gas is provided for the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson. Since the frustum-shaped caisson is a frustum structure with a smaller upper part and a larger lower part, it is beneficial for the gas overflowing from the edge of the impeller tray to rise along the inner wall of the frustum-shaped caisson and fill the inverted stepped air chamber belt immersed in the water body, isolating the water body from the inner wall of the frustum-shaped caisson and reducing the viscous force between the water body and the inner wall of the frustum-shaped caisson.

3. The system for water body rotation, drainage energy storage and power generation according to claim 1, characterized in that: The biological cleaning unit includes a floating cavitation jet bubble gun, which floats on the water surface. The main shaft passes through the center of the floating cavitation jet bubble gun, floating up and down and rotating with the water body. The floating cavitation jet bubble gun emits cavitation jet bubbles to scan and clean the aquatic organisms on the inner wall of the frustum-shaped caisson. The cleaned aquatic organisms fall to the edge of the impeller platform under the action of the centrifugal force and gravity of the rotating water body. When passing through the pumping and drainage diversion pipeline opening, they are discharged through the water pump under the action of the water flow.

4. The system for water body rotation, drainage energy storage and power generation according to claim 1, characterized in that: The water body rotation drag reduction unit includes: an air compressor, an airbag, and a compressed gas exhaust pipeline; the air compressor is placed on the outer top of the frustum-shaped caisson. The air intake pipe of the air compressor passes through the top cover of the frustum-shaped caisson and is communicated with the gas inside the frustum-shaped caisson; the air compressor is communicated with the airbag through the compressed gas exhaust pipeline; the compressed gas in the airbag is discharged into the impeller tray air chamber at the lower part of the impeller tray through the compressed gas control valve via the pipeline. Under the control of the compressed gas control valve, gas is respectively provided for the impeller tray air chamber at the lower part of the impeller tray and the gas overflowing from the impeller tray air chamber, providing attached gas for several inverted stepped air chamber belts on the inner wall of the frustum-shaped caisson. Since the gas in the impeller tray air chamber at the bottom of the impeller tray and several inverted stepped air chamber belts are immersed in the water body and are sealed by the water body, the gas consumption for overcoming the viscous force between the water body and the inside of the frustum-shaped caisson is relatively small; the air compressor further compresses the compressed gas in the frustum-shaped caisson into the airbag, greatly improving the efficiency of the air compressor.

5. The control method of the system for water body rotation, drainage energy storage and power generation according to any one of claims 1-4, characterized in that, It includes the following steps: Initial state: The frustum-shaped caisson and the airbag are placed at a certain water depth. The frustum-shaped caisson is in an empty state. There is a certain amount of gas in the airbag, and the atmospheric exhaust valve of the frustum-shaped caisson is closed. Step 1, when in the power generation state: Step 1.1 When the system of combining water body rotation, drainage energy storage and power generation enters the power generation state, the water turbine starts to generate electricity under the action of the water head pressure. The water flow enters the frustum-shaped caisson and rotates along the inner wall of the frustum-shaped caisson. At the same time, a certain power is given to the impeller platform driven by the motor, and the impeller platform is controlled to rotate synchronously with the water flow. After reaching the basic speed, the motor stops working, and at the same time, the water jump phenomenon is reduced. When the water level reaches the impeller platform, that is, when the water level submerges the impeller tray air chamber, start the airbag and, under the control of the compressed gas control valve, fill the impeller tray air chamber below the impeller platform with gas through the compressed gas exhaust pipeline, separating the impeller platform from the water body at the bottom of the frustum-shaped caisson and reducing the viscous force of water to accelerate the rotation of the water body. Step 1.2 As the power generation of the water turbine increases and the water level in the frustum-shaped caisson reaches a certain height, the airbag, under the control of the compressed gas control valve, synchronously fills the impeller tray air chamber with gas through the compressed gas exhaust pipeline, and the gas overflows from the impeller tray air chamber and gradually rises along the inner wall of the frustum-shaped caisson, filling the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson at the same water level. At this time, the gas is enclosed in the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson by the water body, separating the water body from the bottom and inner wall of the frustum-shaped caisson and reducing the viscous force of water to accelerate the rotation of the water body and the impeller platform. Step 1.3 As the power generation of the water turbine increases and the water level in the frustum-shaped caisson reaches a certain height, due to the closure of the atmospheric exhaust valve of the frustum-shaped caisson, the gas pressure in the upper part of the water body in the frustum-shaped caisson increases. When the pressure difference with the water head approaches the power generation power pressure required by the water turbine, start the air compressor 4 to compress the gas in the upper part of the water body in the frustum-shaped caisson into the airbag, releasing the pressure in the frustum-shaped caisson. Step 1.4 When the gas in the airbag reaches the limit, close the air compressor, open the atmospheric exhaust valve to provide a larger power generation space for the water turbine. The water flow power generation continuously drives the water body to rotate to generate kinetic energy. At the same time, the airbag, under the control of the compressed gas control valve, provides gas for the inverted stepped air chamber belt on the inner wall of the frustum-shaped caisson at the same water level to ensure that the water body is separated from the bottom and inner wall of the frustum-shaped caisson. Step 2, when there is surplus electricity due to the inability to transmit the new energy power generation externally for energy storage: Step 2.1 When there is surplus electricity, start the water pump to drain the water in the frustum-shaped caisson through the pumping and drainage diversion pipeline. At this time, the water body continues to drive the water body and the impeller platform to rotate under the kinetic energy of the water flow pumped by the water pump; at the same time, the floating cavitation jet bubble gun rotates with the water body to regularly clean the organisms on the inner wall of the frustum-shaped caisson; when the organisms washed down enter the water inlet of the pumping and drainage diversion pipeline under the action of centrifugal force, the dirt is discharged. Step 2.2 As the water in the frustum-shaped caisson is discharged, the water level drops. When the water level reaches the appropriate height, the gas in the inverted stepped air chamber zone on the inner wall of the frustum-shaped caisson above the same height is released; when the water level reaches the impeller platform, stop the water pump to ensure that the gas in the impeller tray air chamber is sealed by water, reducing the viscous resistance between the impeller platform and the water body at the bottom of the frustum-shaped caisson. Step 2.3 If there is residual electricity, start the motor to accelerate the speed of the impeller platform. When there is no residual electricity, the impeller platform maintains rotation using its weight inertia. Step 2.4 When rapid support for the power grid is required, start the generator to generate electricity, and the inertial kinetic energy of the impeller platform drives the generator to generate electricity. Step 2.5 When the rotational speed of the impeller platform drops to a certain level, start the water turbine to generate electricity and enter the power generation state. The water turbine starts generating electricity under the action of the head pressure. The water flow enters the frustum-shaped caisson and drives the water body and the impeller platform to rotate continuously.

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