Film-covered sealing pressurizing pumped storage device

Abstract

The utility model relates to a film-covered sealing pressurizing pumped storage device, which mainly comprises a flexible sealing film (4), a high-pressure-resistant sealing tank (5), a pumped storage unit (1), a water pipe (2) and the like, the flexible sealing film (4) is connected with the inner wall of the high-pressure-resistant sealing tank (5) in a sealing manner after being folded to form two sealed spaces with variable volumes, namely a water storage bin (8) and a gas storage bin (7); water is pressurized through the pumped storage unit (1) and then injected into the water storage bin (8), overpressure water is generated, gas in the gas storage bin (7) is compressed through the overpressure water, electric energy is converted into compressed gas potential energy, and energy storage is achieved. During energy release, overpressure water is injected into the pumped storage unit (1) for power generation, the volume of the water storage bin (8) is reduced, the volume of the gas storage bin (7) is expanded, gas pressure is reduced, potential energy of compressed gas is converted into electric energy, and the energy storage device has the advantages of being high in construction speed, high in efficiency, low in construction cost, capable of being built anywhere and anytime and good in environmental protection benefit.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of film sealing pressurized pumped storage device. BACKGROUND

[0002] With the development and large-scale application of wind energy, solar energy and other new energy technologies, due to the inconsistency between new energy power generation and social electricity consumption time, energy storage has gradually become one of the bottlenecks of social development. The existing energy storage methods mainly include gravity storage, compressed air storage, hydrogen storage by electrolysis of water and electrochemical energy storage, etc. Electrochemical energy storage has problems such as high cost, small storage capacity, short service life, high cost of waste battery disposal, and safety hazards such as explosion and fire. In order to solve the problem of energy storage, domestic and foreign experts, scholars and research institutions have begun to study compressed air energy storage and hydrogen production by electrolysis of water technology. Currently, the hydrogen production by electrolysis of water technology has been in trial production and has the ability to produce hydrogen by electrolysis of seawater, but the cost of hydrogen production is high, the storage and transportation cost of hydrogen after hydrogen production is high, and there are problems of high-pressure gas explosion safety hazard and high cost. Compressed air energy storage technology has also been applied, and the energy conversion rate of compressed air energy storage is significantly lower than pumped storage, and it also has the problem of high cost. Solving the problem of energy storage has become a major scientific and technological problem that needs to be solved urgently for social development, and it is a key link to promote green and low-carbon development and solve the problem of energy self-reliance.

[0003] Gravity energy storage is to use the gravity of the earth, when storing energy, use the motor to transport the heavy object to a high place, convert the electric energy into the potential energy of the heavy object, when releasing energy, drop the heavy object to a low place, drive the generator to generate electricity, and convert the potential energy of the heavy object into electric energy. Gravity energy storage can be divided into water medium type gravity energy storage and solid medium type gravity energy storage according to the storage medium, and pumped storage is a typical representative of water medium type gravity energy storage; solid medium type gravity energy storage has not been widely used in engineering, and the solid medium gravity energy storage method in the research and development test stage has a pulley gravity energy storage type, which uses the combination of pulley block and motor, stores the potential energy of the solid heavy object by lifting it to a high place during energy storage, and realizes the storage of electric energy, and when releasing energy, the heavy object at a high place falls, at the same time, the pulley block rotates, and the generator set generates electricity. Pumped storage is the largest and most economical large-scale energy storage method in the world, with high safety, mature technology and high energy conversion rate. At present, the installed capacity of pumped storage in China accounts for about 94% of the total installed capacity of energy storage (as of 2020). In recent years, the number of pumped storage projects has increased significantly, and more than 100 pumped storage power stations are under construction. The principle of pumped storage is to build an upper reservoir (or upper pool) at a high place and a lower reservoir (or lower pool) at a low place, when storing electric energy, use the motor set to drive the water pump to pump water from the lower pool to the upper pool, consume electric energy, at the same time, send the water to a high place, generate potential energy, and realize the storage of electric energy; when releasing electric energy, the water in the upper pool flows out to the lower pool through the water tunnel, and drives the water turbine to rotate, drives the generator set to generate electricity, and realizes the release of electric energy. Pumped storage needs to be equipped with a large difference (generally more than 400-600 meters) between the upper and lower pools (also known as upper and lower reservoirs), and the suitable geographical conditions are very limited, the construction period is long, which takes 5-8 years, and the construction cost is high. The construction of pumped storage power station often occupies a large amount of land as the upper pool, causing adverse effects such as slope stability and ecological environment destruction. The process of electric energy storage and electric energy release in pumped storage is a reversible process, in the mechanical and electrical equipment, most pumped storage power stations combine the motor set and water pump into the motor-pump set, and the generator set and water turbine into the hydroelectric generator set, and realize the functions of pumped storage and hydroelectric power generation by controlling the forward and reverse operation of the pump-turbine. The pumped storage unit and its auxiliary equipment mainly include pump-turbine, motor-generator, speed regulator, excitation system, static frequency converter, mechanical and electrical protection, computer control system, which has reached a high level after long-term research and development and application, with high efficiency and mature and stable technology. The construction cost of pumped storage project includes the construction cost of upper and lower pools, water tunnel and power grid supporting facilities, and the cost of pumped storage unit. At present, the construction cost of pumped storage power station accounts for about 90% of the total cost.Solving the problem of limited site selection of pumped storage power station, reducing the land area of pumped storage power station, reducing the influence of pumped storage power station construction on natural ecological environment, reducing the civil construction cost of pumped storage power station, has very great economic, social and environmental protection value to the development of energy storage technology. In the theoretical research aspect, M. Berrada et al. published a paper in the journal Energy in 2016, titled Gravity-based Piston Pumped Hydro Storage: A new concept for large-scale energy storage, introduced the concept of gravity type piston pumped storage, that is, in the sealed circulating channel, the gravity of the piston gives water pressure, and the reversible water pump turbine is used for power generation. In the energy storage stage, water is pumped by driving the water pump, and the water pressure is used to lift the piston to convert into the gravitational potential energy of the piston. This technology has few limitations, can realize repeated operation, long time power generation, and theoretically provides a new possibility for large-scale pumped storage. The method of pumped storage needs a large diameter high pressure water storage pipe. When matched with the commonly used pumped storage unit, the diameter of the water storage pipe should be set between 10 meters and 200 meters, and the water pressure that the water storage pipe should bear should be between 4MPa and 8MPa. Taking the 40-meter-diameter water storage pipe as an example, the water pressure requirement reaches 8MPa, and when the commonly used Q235 steel material is used as the pipe wall material, according to the mechanical calculation, the pipe wall thickness needs to reach about 1 meter, which has great manufacturing difficulty, complex process and high cost. On the other hand, for the 1-meter-thick ordinary steel as the water storage pipe wall, a 16mm expansion deformation will be generated in the radial direction, and a large amount of shrinkage deformation will be generated under the action of high pressure water on the piston, and a gap will be generated between the water storage pipe and the piston. The existing sealing technology is difficult to complete the sealing between the piston and the water storage pipe. Under high pressure, the sealing problem between the large-diameter water storage pipe and the piston, the great pressure caused by the overall sealing and the problem of the strength of the pipe material under pressure, and the construction problem of the large-diameter pipe under high water pressure are the key to hinder the development and application of the technology, and further research is still needed. SUMMARY

[0004] The utility model aims at providing a kind of film sealing pressurized pumped storage device, and the energy storage device manufacturing speed is fast, and the foundation requirement is low, can be placed in water and work, and the cost is low, especially suitable for ocean and nearshore area energy storage.

[0005] The film sealing pressurized pumped storage device includes a high-pressure resistant sealing tank, a flexible sealing film, a pumped storage unit, a water pipe, and a lower pool, wherein the high-pressure resistant sealing tank is a sealed container with the function of storing high-pressure gas or high-pressure liquid, the flexible sealing film is a water-tight cloth-like component with folding performance, the flexible sealing film is sealed and connected with the inner wall of the high-pressure resistant sealing tank after being folded, the high-pressure resistant sealing tank is divided into two sealed spaces with the function of volume change, i.e., a gas storage room and a water storage room, the pumped storage unit is communicated with the water storage room through the water pipe, and the lower pool is a pool with the function of storing water.

[0006] In the film sealing pressurized pumped storage device, the high-pressure resistant sealing tank can be a combination of multiple high-pressure resistant sealing tanks, the water storage rooms of the high-pressure resistant sealing tanks are communicated with each other, and the gas storage rooms of the high-pressure resistant sealing tanks are communicated with the sealed spaces with the function of storing gas in other high-pressure resistant sealing tanks.

[0007] In the film sealing pressurized pumped storage device, the pumped storage unit can be installed in the water pipe, and one end of the water pipe is communicated with the water storage room.

[0008] In the film sealing pressurized pumped storage device, one or both of the gas storage room and the water storage room of the high-pressure resistant sealing tank are provided with a water pipe and a fluid control valve.

[0009] In the film sealing pressurized pumped storage device, a flexible sealing film blocking net is arranged at the position where the water storage room of the high-pressure resistant sealing tank is communicated with the water pipe.

[0010] In the film sealing pressurized pumped storage device, the flexible sealing film is a cloth-like component with the function of heat insulation.

[0011] In the film sealing pressurized pumped storage device, the tank wall of the high-pressure resistant sealing tank is provided with a heat insulation layer.

[0012] In the film sealing pressurized pumped storage device, water is placed in the gas storage room as a heat exchange material.

[0013] In the film sealing pressurized pumped storage device, the tank wall of the high-pressure resistant sealing tank is composed of a steel strand and a building glue filled in the gap of the steel strand.

[0014] The film sealing pressurized pumped storage device fully plays the advantages of high pumped storage unit efficiency, high safety, and high energy conversion rate, simultaneously overcomes defects of large pumped storage site selection limitation and long construction period, solves sealing problems, material strength problems and construction problems of the variable volume high pressure water storage structure in the pumped storage method, forms a high pressure and variable volume sealing space through the film, generates high pressure water body by using the sealing space, realizes electric energy storage and release by mutual conversion of electric energy and potential energy generated by compressed gas by using the pumped storage unit, greatly reduces the pumped storage engineering cost, greatly improves the construction speed of the pumped storage, makes the pumped storage be built anywhere and at any time, has very wide popularization and application prospect and very considerable commercial operation value, and has outstanding social, environmental and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a film sealing pressurized pumped storage device cross section structure schematic view for the first embodiment and the second embodiment of the utility model;

[0016] Figure 2 It is a film sealing pressurized pumped storage device gas storage warehouse inflation water storage warehouse empty condition cross section structure schematic view for the first embodiment of the utility model;

[0017] Figure 3 It is a film sealing pressurized pumped storage device pumped storage state cross section structure schematic view for the first embodiment of the utility model;

[0018] Figure 4 It is a film sealing pressurized pumped storage device cross section structure schematic view for the first embodiment of the utility model using two high pressure resistant sealing tanks;

[0019] Figure 5 It is a film sealing pressurized pumped storage device cross section structure schematic view for the second embodiment of the utility model using a high pressure resistant sealing tank with a middle cylindrical and two ends hemispherical shape;

[0020] Figure 6 It is a film sealing pressurized pumped storage device plan view for the second embodiment of the utility model using a high pressure resistant sealing tank with an annular cylindrical shape;

[0021] Figure 7 It is a film sealing pressurized pumped storage device cross section structure schematic view for the second embodiment of the utility model using a high pressure resistant sealing tank with an annular cylindrical shape;

[0022] Figure 8 It is a film sealing pressurized pumped storage device local tank wall cross section structure schematic view for the second embodiment of the utility model using a high pressure resistant sealing tank with a rubber steel structure. DETAILED DESCRIPTION

[0023] Explanation of reference signs: 1-pumped storage unit 2-water pipe; 3-fluid control valve; 4-flexible sealing membrane; 5-high-pressure-resistant sealing tank; 6-flexible sealing membrane blocking net; 7-gas storage chamber; 8-water storage chamber; 9-steel strand; 10-construction adhesive.

[0024] As a first embodiment of the present application, the structure, the energy storage principle and the manufacturing method of the film-sealed pressurized pumped storage device are introduced. Figures 1-4 The energy storage principle of the film-sealed pressurized pumped storage device of the present application is to form a high-pressure-resistant and volume-variable sealed space by covering the flexible sealing membrane, store high-pressure water in the sealed space, use the pumped storage unit to pump the high-pressure water into the sealed space to consume electric energy and realize the storage of electric energy; when releasing energy, the high-pressure water in the sealed space is discharged to drive the pumped storage unit to generate electricity and realize the release of electric energy. In this embodiment, the folded flexible sealing membrane is arranged in the high-pressure-resistant high-pressure-resistant sealing tank, the high-pressure-resistant sealing tank is divided into two high-pressure-resistant sealed spaces of the gas storage chamber and the water storage chamber, the volume of the gas storage chamber increases when the pressure of the gas storage chamber is greater than that of the water storage chamber, and the volume of the water storage chamber decreases correspondingly, the volume of the water storage chamber increases when the pressure of the water storage chamber is greater than that of the gas storage chamber, and the volume of the gas storage chamber decreases, the total amount of gas can be kept unchanged in the high-pressure-resistant sealing tank, the gas can be compressed, the gas pressure of the gas storage chamber increases when the volume of the gas storage chamber decreases, the volume of the water storage chamber increases and the gas pressure of the gas storage chamber decreases in the process of storing electric energy by using the pumped storage unit to pump water into the water storage chamber, the electric energy is converted into the potential energy of compressed gas for storage, the interface between the water storage chamber and the gas storage chamber is the folded flexible sealing membrane, the folded flexible sealing membrane only separates the gas and the water, does not change the size of the gas pressure, the pressure on the upper surface of the water storage chamber is the same as the gas pressure of the gas storage chamber, and therefore high-pressure water can be generated in the water storage chamber, the specific gravity of water is greater than that of gas, the water body is always located below the gas in the high-pressure-resistant sealing tank when the sealing membrane is in the folded state, and a horizontal gas-water interface is formed as shown in FIG. Figure 3 When the electric energy is released, the high-pressure water in the water storage chamber flows out to drive the pumped storage unit to operate and generate electricity, the volume of the water storage chamber decreases, the volume of the gas storage chamber increases, the gas pressure decreases, and the potential energy generated by the compression of the gas is converted into electric energy. The structure and the implementation method of the film-sealed pressurized pumped storage device of the present application are introduced below. First, the structure of the film-sealed pressurized pumped storage device is introduced. Figures 1-4This paper introduces the structural design of a membrane-sealed pressurized pumped-storage energy storage device. The energy storage device comprises five parts: a high-pressure resistant sealed tank, a flexible sealing membrane, a pumped-storage unit, water pipes, and a lower tank. The high-pressure resistant sealed tank is a sealed container capable of storing high-pressure gas or high-pressure liquid. It can be made of steel and can be spherical, cylindrical in the middle with hemispherical ends, or an annular cylindrical structure. The high-pressure resistant sealed tank can be equipped with a connection port for connecting to the water pipes and a fluid control valve. In this embodiment, because the high-pressure resistant sealed tank is divided into two compartments, two connection ports can be provided, such as... Figures 1-4 As shown. The flexible sealing membrane is a waterproof fabric component with folding properties. After folding, the flexible sealing membrane is sealed to the inner wall of the high-pressure resistant sealing tank. In this embodiment, the flexible sealing membrane is mainly used to form a gas-water interface to prevent high-pressure gas from leaking through the water. Therefore, it only needs to be waterproof and airproof, and the tensile strength requirement for the flexible sealing membrane is not high. In this embodiment, the unfolded shape of the flexible sealing membrane is related to the shape of the high-pressure resistant sealing tank. For a spherical high-pressure resistant sealing tank, the flexible sealing membrane can be a hemispherical membrane. For a cylindrical high-pressure resistant sealing tank, the unfolded flexible sealing membrane can be rectangular. That is, the flexible sealing membrane can cover half of the inner surface of the high-pressure resistant sealing tank under pressure, which meets the requirement. In this embodiment, the flexible sealing membrane divides the high-pressure resistant sealing tank into two sealed spaces with volume changing functions: a gas storage chamber and a water storage chamber. The flexible sealing membrane can be bonded to the inner surface of the high-pressure resistant sealing tank with an adhesive at the symmetrical surface inside the tank to achieve the purpose of dividing the high-pressure resistant sealing tank into a water storage chamber and a gas storage chamber. A better method for deploying the flexible sealing membrane is as follows: with the water storage tank empty and the air storage tank inflated, the sealing membrane completely covers the inner surface of the water storage tank of the high-pressure resistant sealing tank, meaning the entire space of the high-pressure resistant sealing tank is an air storage tank. Figure 2The space of the whole high-pressure-resistant sealed tank is the water storage chamber when the water storage chamber is filled with water. The maximum change range of the volume of the water storage chamber can be obtained by using the flexible sealing film, i.e., the volume change range of the water storage chamber and the gas storage chamber is zero to close to the whole volume of the high-pressure-resistant sealed tank. In this embodiment, the pumped storage unit and auxiliary equipment introduced in the background art can be used. In this embodiment, the pumped storage unit can be placed in a large-diameter water pipe, and the water pipe is connected to one side of the water storage chamber of the high-pressure-resistant sealed tank and communicates with the water storage chamber through the water pipe. In this embodiment, the lower pool is a water pool with water storage function, and a river, a lake, an ocean, a pond or a foundation pit can be used as the lower pool. In this embodiment, the weight of the high-pressure-resistant sealed tank is relatively light, and the requirement for the foundation bearing capacity is low, which only needs to bear the weight of the high-pressure-resistant sealed tank itself and the weight of the high-pressure-resistant sealed tank filled with water. The high-pressure-resistant sealed tank can also be placed in water as a floating energy storage device, which is particularly suitable for ocean wind power generation and photovoltaic power generation. In this embodiment, the high-pressure-resistant sealed tank can be a combination of multiple high-pressure-resistant sealed tanks, as long as the water storage chambers of the high-pressure-resistant sealed tanks are communicated with each other and the gas storage chambers of the high-pressure-resistant sealed tanks are communicated with each other. After the gas storage chambers are communicated with each other, the gas pressure of the communicated gas storage chambers remains the same, and the upper surface pressure of the water storage chamber is also the same as the gas pressure of the gas storage chamber. Under the action of the gas pressure, the communicated gas storage chambers will simultaneously perform compression under pressure and expansion under reduced pressure, which is consistent with the principle of using a single high-pressure-resistant sealed tank. In this embodiment, a separate high-pressure-resistant sealed tank can be provided as a gas storage chamber, which is communicated with the gas storage chamber of the high-pressure-resistant sealed tank separated by the flexible sealing film. Because the gas has the performance of volume reduction under pressure and volume expansion under reduced pressure, the gas storage chamber of the high-pressure-resistant sealed tank and the sealing space with gas storage function in other high-pressure-resistant sealed tanks are communicated with each other to expand the volume of the gas storage chamber. In this way, multiple high-pressure-resistant sealed tanks can be used in series to improve the energy storage capacity of the energy storage device and avoid building a single large-volume high-pressure-resistant sealed tank. In this embodiment, a gas communication port and a fluid control valve can be provided in the gas storage chamber of the high-pressure-resistant sealed tank to control the amount of gas stored in the gas storage chamber according to the maximum and minimum water body pressure control requirements. When the water storage chamber is empty, the gas storage chamber can be inflated and pressurized so that the gas pressure of the gas storage chamber reaches the minimum pressure control requirement of the high-pressure water body, and then the fluid valve of the gas storage chamber is closed to keep the total amount of gas unchanged during the energy storage and release process. In this embodiment, the water storage chamber of the high-pressure-resistant sealed tank is provided with a water body communication port and a fluid control valve to control the water storage capacity of the water storage chamber.In the embodiment, when the water in the water storage chamber is completely discharged, the flexible sealing film will be pulled and broken by the gas pressure in the gas storage chamber. In order to avoid that the flexible sealing film bears too high gas pressure, a flexible sealing film blocking net can be arranged at the position where the water storage chamber is communicated with the water pipe, the flexible sealing film blocking net blocks the extension of the flexible sealing film, and bears the gas pressure at the position where the high-pressure-resistant sealing tank is communicated with the water pipe. The flexible sealing film blocking net is provided with a plurality of small-diameter water outlet holes for facilitating the water flow in and out of the water storage chamber. The following part of the embodiment mainly introduces the use method and steps of the film-sealed pressurized water pumping and storing device. Figures 1-4 In the first step, the high-pressure-resistant sealing tank is manufactured, the flexible sealing film with folding performance is folded and sealed and connected with the inner wall of the high-pressure-resistant sealing tank, and the high-pressure-resistant sealing tank is divided into the gas storage chamber and the water storage chamber, which are two sealed spaces with variable volumes. In this step, the energy storage device is manufactured, and the manufacture of the high-pressure-resistant sealing tank and the installation of the flexible sealing film can be completed according to the structure and configuration of the energy storage device in the foregoing embodiment. It is considered that the gas pressure in the high-pressure-resistant sealing tank is the same, the specific gravity of water is greater than that of gas, and the water body is always located at the lower part of the high-pressure-resistant sealing tank under the condition that only the folded flexible sealing film is arranged in the high-pressure-resistant sealing tank, regardless of the gas pressure in the high-pressure-resistant sealing tank. Therefore, in this step, the water storage chamber is preferably arranged at the lower part of the high-pressure-resistant sealing tank, and the gas storage chamber is arranged at the upper part of the high-pressure-resistant sealing tank. After the first step is completed, the second step is entered. In this step, the water-pumping and energy-storing unit is communicated with the water storage chamber manufactured in the first step through the water pipe, and the gas is filled into the gas storage chamber. In this step, the amount of the gas filled into the gas storage chamber is determined according to the minimum pressure of the high-pressure water body. Before the water is filled into the water storage chamber, the high-pressure-resistant sealing tank is completely filled with gas after the gas is filled into the gas storage chamber, and the folded flexible sealing film is tightly attached to the inner side of the water storage chamber of the high-pressure-resistant sealing tank under the gas pressure of the gas storage chamber. Figure 2The gas pressure in the high-pressure resistant sealed tank is determined by the total amount of gas filled in the high-pressure resistant sealed tank. The greater the amount of gas filled, the greater the gas pressure. In this embodiment, taking the minimum pressure of the high-pressure water body on the upper surface of the water storage bin as 4 MPa, the gas pressure of the gas storage bin is increased to 4 MPa in this step. After the second step is completed, the third step is entered. In this step, the power grid system supplies power to the pumped storage unit. The purpose of this step is to input the excess power into the pumped storage unit when energy storage is needed. The computer control system of the pumped storage unit can be started and stopped in time. After the third step is completed, the fourth step is entered. In this step, the pumped storage unit is driven by electric energy to operate, and the water in the lower pool is pressurized and injected into the water storage bin. A large amount of electric energy can be used to output high-pressure water by increasing the water pressure, thereby realizing the utilization of electric energy. In this step, the computer control system in the pumped storage unit can be used to control the power storage power by controlling the power of the pumped storage unit. After the fourth step is completed, the fifth step is entered. In this step, the overpressure water body in the water storage bin is used to extrude the gas storage bin, so that the volume of the gas storage bin is reduced, the gas in the gas storage bin is compressed, the electric energy is converted into the potential energy generated by the compressed air, and the electric energy storage is realized. After the fifth step is completed, the sixth step is entered. In this step, when electricity is needed, the high-pressure water in the water storage bin generated in the fifth step is injected into the pumped storage unit, so that the overpressure water body in the water storage bin flows out, the volume of the overpressure water body in the water storage bin is reduced, and the overpressure water body flowing out of the water storage bin drives the pumped storage unit to generate electricity. At this time, the volume of the gas storage bin is expanded, the gas pressure is reduced, the compressed potential energy of the gas storage bin is reduced, the pumped storage unit operates to generate electric energy for power supply, the conversion of the compressed gas potential energy into electric energy is realized, and the release of electric energy is realized. After the sixth step is completed, the seventh step is entered. This step is a repeated step. The storage and release of electric energy need to be implemented repeatedly. In this embodiment, the storage and release of electric energy are realized by repeating the third step to the sixth step, and the energy storage purpose is achieved. In this embodiment, a material with good heat insulation performance can be used as the flexible sealing film, and a heat insulation layer is arranged at the high-pressure resistant sealed tank of the gas storage bin to prevent the heat generated by the compressed air from overflowing, so that the volume compression and expansion process of the gas in the gas storage bin is close to an adiabatic process, and the energy conversion efficiency is improved. In this embodiment, a proper amount of water can also be filled in the gas storage bin as a heat exchange material for heat release and heat absorption during gas compression and expansion, so as to maintain the stability of the temperature of the gas storage bin.

[0025] As a second embodiment of the utility model, in combination with Figure 1 , Figures 5-8 , the structure and manufacturing method of the high-pressure resistant sealed tank used in the film-sealed pressurized pumped storage device of the utility model are mainly introduced. The shape of the high-pressure resistant sealed tank can be designed as a spherical shape as shown in Figure 1 , a middle cylindrical shape with two hemispherical ends as shown in Figure 1 and Figure 5 , or a cylindrical shape with two hemispherical ends as shown in Figure 6 and a cross-sectional shape as shown inFigure 7 The circular cylinder structure is shown. Pumped storage needs to store a large amount of water and the water pressure is very high, so a large volume of high-pressure-resistant sealed tank needs to be built, and the diameter of the sealed tank needs to reach 10-200 meters. For a high-pressure-resistant sealed tank, the larger the diameter, the greater the tension on the tank wall. For example, for a spherical high-pressure-resistant sealed tank with a diameter of 40 meters, when the pressure in the tank is 8 MPa, if Q235 steel is used to manufacture the tank, the tank wall thickness needs to reach 1.5 meters, which is difficult to build and has high cost. In this embodiment, a tank wall of a glue steel structure is introduced. The structure includes a steel strand and a building glue filled in the gap of the steel strand. The placement direction of the steel strand is consistent with the tension direction of the tank wall when storing high-pressure gas. For positions subjected to tension in two directions, cross-laid steel strands are arranged. The steel strands are densely arranged to reduce the amount of building glue. The tank wall tension is borne by the steel strands, and the building glue seals the gap and glues the steel strands into a whole structure. In this embodiment, the building glue can be selected from epoxy resin, anchoring glue and the like. The following part of this embodiment mainly introduces the construction method of the high-pressure-resistant sealed tank used in this embodiment. First, a rubber film is used to manufacture an air bag with the same shape and size as the inner surface of the high-pressure-resistant sealed tank. After completing the first step, the second step is entered. In this step, the air bag manufactured in the first step is inflated to expand the air bag. In this step, enough gas needs to be filled to maintain the gas pressure in the air bag greater than the pressure acting on the air bag before the building glue of the tank wall solidifies during construction. After completing the second step, the third step is entered. In this step, the steel strands are placed on the outer surface of the air bag. In this step, the direction of the steel strands should be consistent with the stress direction of the tank wall. For positions subjected to tension in two directions, cross-laid steel strands should be arranged. More steel strands should be arranged in the direction of greater stress, and fewer steel strands should be arranged in the direction of smaller stress. The steel strands can be placed in layers. The steel strands in the same layer are placed in the same direction and densely arranged to reduce the gap between the steel strands and reduce the amount of building glue. For example, for a spherical high-pressure-resistant sealed tank, the steel strands can be placed in layers along the meridian and latitude directions, as shown in Figure 8 In this embodiment, high-strength steel bars can be used instead of steel strands. In this step, a pre-reserved space is left at the entrance and exit positions of the high-pressure-resistant sealed tank. Steel pipes can be placed at the entrance and exit positions to connect the inside and outside of the high-pressure-resistant sealed tank. After completing the third step, the fourth step is entered. In this step, the outer side of the steel strands placed in the third step is sealed with a sealing film, and a building glue pouring port is reserved. After completing the fourth step, the fifth step is entered. In this step, the building glue is poured into the gap of the steel strands. In this step, the building glue can be poured in sections. After the building glue of the upper part of each section is initially solidified, the building glue of the lower part is poured. The outer sealing film at the upper part of each section can be opened to pour the building glue. In this step, epoxy resin can be selected as the building glue. Epoxy resin has good fluidity and can be directly filled into the gap between the steel strands under the action of gravity. After the building glue of the tank wall is solidified, the construction of the high-pressure-resistant sealed tank is completed.

[0026] The patent includes, but is not limited to, other devices that can be substituted by those skilled in the art.

Claims

1. A film-coated, hermetically sealed pressurized pumped hydro storage device, characterized in that The application relates to a high-pressure-resistant sealed tank (5), a flexible sealing film (4), a pumped storage unit (1), a water pipe (2) and a lower pool, wherein the high-pressure-resistant sealed tank (5) is a sealed container capable of storing high-pressure gas or high-pressure liquid; the flexible sealing film (4) is a water-impermeable cloth-like component with folding performance; the flexible sealing film (4) is sealed and connected with the inner wall of the high-pressure-resistant sealed tank (5) after being folded; the high-pressure-resistant sealed tank (5) is divided into a gas storage cabin (7) and a water storage cabin (8) which are both sealed spaces with volume changing function by the flexible sealing film (4); the pumped storage unit (1) is communicated with the water storage cabin (8) through the water pipe (2); and the lower pool is a water pool with water storage function.

2. The film-coated sealed pressurized pumped hydro energy storage device of claim 1, wherein The high-pressure-resistant sealed tank (5) is a combination of multiple high-pressure-resistant sealed tanks, the water storage cabins (8) of the high-pressure-resistant sealed tanks (5) are communicated with each other, and the gas storage cabins (7) of the high-pressure-resistant sealed tanks (5) are communicated with the sealed spaces with gas storage function of other high-pressure-resistant sealed tanks.

3. The film-coated sealed pressurized pumped hydro energy storage device of claim 1, wherein The pumped storage unit (1) is installed in the water pipe (2), and one end of the water pipe (2) is communicated with the water storage cabin (8).

4. The film-coated sealed pressurized pumped hydro energy storage device of claim 1, wherein One or both of the gas storage cabin (7) and the water storage cabin (8) of the high-pressure-resistant sealed tank (5) are provided with the water pipe (2) and a fluid control valve (3).

5. The film-coated, hermetically sealed pressurized pumped hydro energy storage device of claim 1, wherein The water storage cabin (8) of the high-pressure-resistant sealed tank (5) is provided with a flexible sealing film blocking net (6) at a position communicated with the water pipe (2).

6. The film-coated, hermetically sealed pressurized pumped hydro energy storage device of claim 1, wherein The flexible sealing film (4) is a cloth-like component with heat insulation performance.

7. The film-coated, hermetically sealed pressurized pumped hydro energy storage device of claim 1, wherein The tank wall of the high-pressure-resistant sealed tank (5) is provided with a heat insulation layer.

8. The film-coated, hermetically sealed pressurized pumped hydro energy storage device of claim 1, wherein Water is placed in the gas storage cabin (7) as heat exchange material.

9. The film-coated, hermetically sealed pressurized pumped hydro energy storage device of claim 1, wherein The tank wall of the high-pressure-resistant sealed tank (5) is composed of a steel strand (9) and building glue (10) filled in the gap of the steel strand (9).

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