Compressed air and hydraulic linkage energy storage power generation system

Abstract

The invention discloses a compressed air and hydraulic linkage energy storage power generation system, and aims to overcome the defects that an existing compressed air water pumping energy storage system is large in energy consumption, compressed air directly impacts an air turbine, and the compressed air impacts a water turbine, so that power generation of a generator is unstable. The system has the advantages that the capacity of energy storage and power generation can be small, power generation equipment runs stably, the structure is simple, and the running energy consumption is low; the energy storage power generation system is mainly composed of an electric air compressor, a first pressure regulating valve, a second pressure regulating valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a first pressure-resistant water tank, a second pressure-resistant water tank, a water turbine and a power generator. During working, the electric air compressor is used for pressurizing water in the pressure-resistant water tank for air energy storage; during power generation, a drainage valve of the pressure-resistant water tank is opened, high-pressure water flow discharged from the pressure-resistant water tank impacts a main shaft of the water turbine to drive the generator to generate power, and the generated power is transmitted to a user for use or merged into a power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power storage, and more specifically, to a compressed air and hydraulic linkage energy storage power generation system; Background Art

[0002] There have been reports on power storage and release technology equipment. In CN 221591183U "Hydraulic Energy Storage Device", it is disclosed that during the low-peak period of power grid load, the excess water resources of the hydropower station enter the turbine unit 1, the turbine unit 1 drives the air compressor unit 2, the air compressor unit 2 compresses the air and stores it in the air storage cave 7. During the peak period of power grid load, the compressed air in the air storage cave 7 is released and enters the generator set 6 for power generation, which belongs to the utilization of reservoir water resources; however, air is an elastic medium. When compressed air is used to directly drive the generator set 6 to generate electricity, as the compressed air is continuously released, the pressure of the compressed air in the air storage cave 7 is continuously reduced, and the kinetic energy of the compressed air impacting the rotor rotation in the generator set 6 is continuously reduced, resulting in a continuous reduction in the speed of the generator set 6 and unstable power generation;

[0003] In CN110578666A "A Hydraulic Constant Pressure Double-Effect Compressed Air Energy Storage System", it is disclosed that when storing energy, the first drive motor 8 drives the air compressor unit 1 to compress air under electric drive, and stores the compressed high-pressure air in the gas storage reservoir 4, while the second drive motor 11 drives the water turbine unit 5 to rotate in the opposite direction under electric drive, so as to pump the water at the bottom of the gas storage reservoir 4 into the high-level water source 3, and the electric energy is converted into high-pressure potential energy and high-level release energy for storage. When releasing energy, the high-pressure air in the gas storage reservoir 4 enters the air turbine unit 2 to expand and do work, thereby driving the first generator 9 to output electricity, while the water in the high-level water source 3 pushes the water turbine unit 5 downward to rotate forward and do work, and then enters the gas storage reservoir 4, thereby driving the second generator 10 to output electricity. The efficiency of the air compressor is not high, and has not reached 80% at present. Air is an elastic medium, and the energy of directly pushing the cylinder cannot be fully released. The efficiency of pushing the turbine is also not high. There is a power loss of more than 40% from the beginning of compression to the power output. If it is used for power generation again, the efficiency is even lower. The energy loss of directly using the energy released by compressed air in the mechanical system is large; it is well known that the efficiency of hydropower generation is as high as more than 90%. The water level drop of hydropower generation in hydropower stations generally ranges from tens of meters to hundreds of meters. Traditional hydropower generation is to build dams to block water to form an artificial lake with a vast water surface. The high water level drop impacts the turbine to drive the generator to generate electricity; the high-level water source 3 has no hydraulic impact when the water level drop is small, and the power generation effect is poor; if the high-level water source 3 increases the water level, it is necessary to store energy and water in a reservoir environment similar to the natural environment with a high water level drop, which is no different from traditional reservoir hydropower generation. Therefore, the energy storage power generation efficiency of the publication number CN1l0578666A "A hydraulic constant pressure double-effect compressed air energy storage system" is low and has no practical value;

[0004] In the application publication number CN 119102818A "Energy storage system using compressed air, pumped storage and PVT coupling", the air sent into the air turbine is expanded to do work and then the mechanical energy is converted into electrical energy. Air is an elastic medium. The compressed air directly drives the cylinder energy of the air turbine and cannot be fully released. There is a power loss of more than 40% from the beginning of compression to power output. Pumped storage power generation, compressed air turbine power generation and PVT panel power generation, connected to the external power grid, are all high-energy consumption and low-efficiency energy storage power generation methods.

[0005] In the application publication number CN119103082A "Compressed Air Pumping Energy Storage System", the water pump (16) is one of a centrifugal pump, a vortex pump, an axial flow pump, a piston pump, a Roots pump or a screw pump. Water is injected into the pressure vessel through the water pump or the water pump 16. The water pump 16 pumps into the liquid piston to compress the air into high-pressure air and stores it in the high-pressure air storage tank 13. This is to use a power-consuming water pump to pump water into the pressure vessel, so that the water level in the pressure vessel increases, resulting in the space in the pressure vessel being occupied by water, so that the space in the pressure vessel becomes smaller and compressed air is generated. ; By injecting water through a pump to reduce the space volume in the pressure vessel to generate compressed air, the water pump 16 needs to consume electricity to operate, and has the characteristics of high energy consumption and low efficiency; the high-temperature heat medium is heat exchanged, and the high-pressure air enters the air turbine unit 8 after heating to output electrical energy; the high-temperature heat medium also needs to consume heat, and air is an elastic medium. The compressed air directly drives the cylinder energy of the air turbine unit 8 and cannot be fully released. There is a power loss of more than 40% from the beginning of compression to power output. The air turbine unit 8 outputs electrical energy by working externally, which is a high-energy-consuming power generation method;

[0006] The market is eager to see an innovative turbine generator system that uses high-pressure water flow to impact the turbine, which does not require a pumping system, does not use elastic compressed air to directly impact the air turbine, does not use elastic compressed air to impact the turbine or generator, and does not require high-water-level damming. Summary of the invention

[0007] In order to overcome the above-mentioned defects of large energy consumption of compressed air pumping water storage, and the unstable power generation and small power generation of compressed air directly impacting the air turbine, elastic compressed air impacting the turbine or generator, the present invention provides a compressed air and hydraulic linkage energy storage power generation system, which has the advantages of small energy storage and power generation capacity, stable operation of power generation equipment, simple structure, and low energy consumption of energy storage power generation, so as to meet the needs of world power reserve power generation;

[0008] A compressed air and hydraulic linkage energy storage power generation system, the system mainly comprises an electric air compressor (1), a pressure regulating valve 1 (15), a pressure regulating valve 2 (18), a valve 3 (4), a valve 4 (7), a valve 5 (12), a valve 6 (25), a valve 7 (28), a valve 8 (29), a pressure water tank 1 (11), a pressure water tank 2 (19), a turbine (31) and a generator (32); the system is characterized in that: the exhaust port of the electric air compressor (1) is connected to the inlet of the valve 3 (4) and the inlet of the valve 7 (28) through an air pipeline, the outlet of the valve 3 (4) is connected to the inlet 1 (6) of the top of the pressure water tank 1 (11) through a pipeline, and the outlet of the valve 7 (28) is connected to the inlet 1 (6) of the top of the pressure water tank 2 (19) through a pipeline. The bottom outlet of the pressure-resistant water tank (11) is connected to the inlet (33) of the turbine (31) through the pressure regulating valve (15) and the drainage pipe (16), the bottom outlet of the pressure-resistant water tank (19) is connected to the inlet (33) of the turbine (31) through the pressure regulating valve (18) and the drainage pipe (17), a connecting shaft is arranged between the turbine (31) and the generator (31), the outlet (2) of the turbine (31) is connected to the inlet (8) of the upper part of the pressure-resistant water tank (11) through the drainage pipe (27) and the valve (12), and the outlet (2) of the turbine (31) is connected to the inlet (26) of the upper part of the pressure-resistant water tank (19) through the drainage pipe (30) and the valve (29);

[0009] The pressure-resistant water tank (11) is a pressure-resistant sealed container. The top of the pressure-resistant sealed container is provided with a pressure gauge (5) and a valve (7). The lower part of the pressure-resistant sealed container is a water storage tank (14). The upper part of the pressure-resistant sealed container is an air storage tank (9). The upper part of the water storage tank (14) is an air storage tank (9). A liquid level controller (10) is provided on the upper side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller (10) is provided at a high level line position in the water storage tank (14). A liquid level controller (2) is provided on the lower side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller (10) is provided at a low level line position in the water storage tank (14).

[0010] The pressure-resistant water tank 2 (19) is a pressure-resistant sealed container. The top of the pressure-resistant sealed container is provided with a pressure gauge 2 (23) and a valve 6 (25). The lower part of the pressure-resistant sealed container is a water storage tank 2 (3). The upper part of the pressure-resistant sealed container is an air storage tank 2 (20). The upper part of the water storage tank 2 (3) is an air storage tank 2 (20). A liquid level controller 4 (22) is provided on the upper side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller 4 (22) is provided at a high level position in the water storage tank 2 (3). A liquid level controller 3 (21) is provided on the lower side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller 3 (21) is provided at a low level position in the water storage tank 2 (3).

[0011] The electric air compressor (1) is an electric-driven air compressor with an outlet pressure of 0.1MPa-40MPa; such as the SF-7.5 / 250 model produced by Bengbu United Compressor Manufacturing Co., Ltd., with medium air, air cooling, flow rate of 450Nm3 / h, intake pressure of normal pressure, exhaust pressure of 25MPa and power of 160kw; the GSW400 model produced by Shanghai Guoxia Compression Molding Machine Co., Ltd., with air cooling, 24Nm 3 / h, atmospheric pressure, exhaust pressure 30MPa and power 7.5kw, and DX-1.5 / 400 type: four-stage piston compressor, exhaust pressure 40MPa, exhaust volume 90m 3 / h, rated power: 37KW, noise: <90dB(A) weight: 2000kg, volume: 1850×1690×1500cm;

[0012] The water turbine (31) is a power machine that converts the energy of water flow into rotational mechanical energy. It is divided into two categories: impulse water turbine and reaction water turbine. It is a water turbine used in a hydropower station. Water from an upstream reservoir is introduced into the water turbine through a water diversion pipe, driving the water turbine runner to rotate and drive the generator to generate electricity. The water that has completed the work is discharged downstream through a tailwater pipe. The higher the water head and the greater the flow rate, the greater the output power of the water turbine, and the water turbine drives the generator to generate electricity.

[0013] The generator (32) is a generator that uses a water turbine (31) as a prime mover to convert water energy into electrical energy. When water flows through the water turbine (31), the water energy is converted into mechanical energy. The rotating shaft of the water turbine (31) drives the rotor of the generator (32) to convert the mechanical energy into electrical energy for output. It is a power generation equipment of a hydropower station.

[0014] The pressure regulating valve 1 (15) and the pressure regulating valve 2 (18) are self-operated balancing valves, flow control valves, and flow balancing valves, and are flow regulating and controlling devices. The flow regulating valves used in the pipeline network can directly set the flow according to the design, automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline, and keep the set flow unchanged regardless of how the system pressure changes.

[0015] The working principle of the water turbine (31) and the generator (32) of the present invention is:

[0016] The high-pressure air output by the electric air compressor (1) is injected into the air chamber (9) in the pressure-resistant water tank (11). The high-pressure air in the air chamber (9) makes the water in the water storage tank (14) in a high-pressure energy storage state. The drainage valve pressure regulating valve (15) below the water storage tank (14) is opened. The outlet pressure and water flow of the discharged water are adjusted by operating the pressure regulating valve (15). The water in the pressure-resistant water tank (11) passes through the volute and guide of the turbine (31) in the form of high-pressure water flow. The water mechanism converts water energy into mechanical energy. The runner of the water turbine (31) rotates under the pressure and speed of water, converting water energy (kinetic energy, potential energy) into mechanical energy. The rotating shaft of the water turbine (31) drives the generator (32) to generate electricity. In this process, the water turbine (31) converts water energy into mechanical energy, and the generator (32) converts mechanical energy into electrical energy through the principle of electromagnetic induction. The water discharged by the water turbine (31) is transported to the water storage tank (3) of the pressure-resistant water tank (19) under normal pressure.

[0017] When power generation is started again after electric energy storage, the electric air compressor (1) is started, and the high-pressure air output by the electric air compressor (1) is injected into the air chamber (20) in the pressure-resistant water tank (19). The high-pressure air in the air chamber (20) makes the water in the water storage chamber (3) in a high-pressure energy storage state. The drainage valve pressure regulating valve (18) below the water storage chamber (3) is opened, and the outlet pressure and water flow of the discharged water are adjusted by operating the pressure regulating valve (18). The water in the pressure-resistant water tank (19) passes through the volute and water guide mechanism of the water turbine (31) in the form of high-pressure water flow, and the water energy is converted into mechanical energy. The runner of the water turbine (31) rotates under the pressure and speed of the water, and the water energy (kinetic energy, potential energy) is converted into mechanical energy. The rotating shaft of the water turbine (31) drives the generator (32) to generate electricity, and the water discharged by the water turbine (31) is transported to the water storage chamber (14) of the pressure-resistant water tank (11) under normal pressure.

[0018] The specific operation of the above process is as follows: open valve three (4), close valve seven (28), close valve four (7), close valve five (12) and close pressure regulating valve one (15), start the electric air compressor (1) to pressurize the water in the pressure-resistant water tank one (11) to a certain high-pressure value, display and monitor the pressure in the air bin one (9) through the pressure sensor one (5), and turn off the power supply of the electric air compressor (1) to stop the operation of the electric air compressor (1); then, close the valve Three (4), then close the pressure regulating valve two (18), open the valve six (25) and open the valve eight (29). When the pressure regulating valve one (15) is opened, the water in the pressure-resistant water tank one (11) impacts the main shaft of the water turbine (31) with high-pressure water flow to drive the generator (32) to generate electricity. The water discharged from the water turbine (31) flows into the pressure-resistant water tank two (19) of normal pressure for buffering. The water flow rate and water flow pressure entering the water turbine (31) are controlled by manipulating the pressure regulating valve one (15);

[0019] Open valve seven (28), close valve three (4), close valve six (25), close valve eight (29) and close pressure regulating valve two (18), start the electric air compressor (1) to pressurize the water in pressure-resistant water tank two (19) to a certain high-pressure value, display and monitor the pressure in air chamber two (20) through pressure sensor two (23), and turn off the power supply of the electric air compressor (1) to stop the operation of the electric air compressor (1); then, close valve seven (28), close pressure regulating valve one (15), open valve four (7) and open valve five (12), when the pressure regulating valve two (18) is opened, the water in pressure-resistant water tank two (19) impacts the main shaft of turbine (31) with high-pressure water flow to rotate and drive generator (32) to generate electricity, and the water discharged from turbine (31) flows into pressure-resistant water tank one (11) at normal pressure for buffering;

[0020] The pressure-resistant water tank 1 (11) and the pressure-resistant water tank 2 (19) can be operated alternately according to the above method to implement a compressed air and hydraulic linkage energy storage power generation system according to the present invention;

[0021] In general, the water storage level of the dammed water for turbine power generation in a spontaneous combustion environment ranges from tens of meters to more than one hundred meters. For example, the turbine model of the Qingshan Hydropower Station in Linli County, Hunan Province is ZZ600a-LH-330, the designed turbine head is 6.2m, the generator model is SF3200-48 / 4250, the designed annual power generation is 25 million kWh, and the water storage level is 49-50 meters; the water level of the Gezhouba Dam is 66 meters, the turbine model is ZZ500-LH-1020, the average turbine head is 20.5 meters, and the turbine flow is 825 cubic meters / second; the water storage height of the Three Gorges Dam on the Yangtze River is 166 meters, and the rated head of the turbine of the Three Gorges Right Bank Hydropower Station is 85 meters; therefore, the turbine generator set is a mature and large-capacity hydropower generator equipment with stable equipment operation.

[0022] 1Kg / cm 2 The pressure is equal to 10.336 meters of water column, or 16.06 kg / cm 2 The pressure is equal to 166 meters of water column; as long as the water in the pressure-resistant sealed container is pressurized to 16.06Kg / cm2 or 1.606MPa, the water flow pressure head of the water discharged from the sealed container is equivalent to the hydraulic pressure head of the water storage height of the dam is 166 meters, which impacts the turbine; the present invention selects an air compressor with an exhaust pressure of 0.1MPa-100MPa to pressurize the water in the pressure-resistant sealed container, and the high-pressure water flow discharged from the pressure-resistant sealed container impacts the main shaft of the turbine to rotate, driving the generator to generate electricity;

[0023] In the present invention, when the pressure of the compressed air in the pressure-resistant sealed container is greater than the water head pressure of the turbine rotation, the high-pressure water flow discharged from the pressure-resistant sealed container can drive the main shaft of the turbine to rotate and drive the generator to generate electricity; for example, when the design water head pressure of the turbine rotation is 30 meters, when the pressure of the high-pressure water flow discharged from the pressure-resistant sealed container is greater than 0.3MPa, the turbine can rotate and drive the generator to generate electricity; if the pressure of the compressed air in a pressure-resistant sealed container is 10MPa, as the water in the pressure-resistant sealed container is discharged, the water pressure gradually decreases, and when the water pressure in the pressure-resistant sealed container drops to 0.3MPa, the turbine stops working and the generator stops generating electricity;

[0024] According to Boyle-Malior's law: at a constant temperature, the pressure of a certain amount of gas is inversely proportional to its volume, that is, P1V1=P2V2. If 95 cubic meters of a 100-cubic-meter pressure-resistant closed container is designed as a water storage tank and 5 cubic meters is designed as an air storage tank, and compressed air is injected into the 5-cubic-meter air storage tank to 2MPa; when 90 cubic meters of water is discharged from the water storage tank or the water storage capacity of the water storage tank drops to 5 cubic meters, the volume of the air storage tank increases from the original 5 cubic meters to 95 cubic meters, and the pressure of the air storage tank decreases to 0.1MPa, that is,

[0025] V1 = 5 cubic meters, P1 = 2MMPa, V2 = 95 cubic meters (5 + 90);

[0026] 5×2=P2×95, P2=0.105MPa,

[0027] If the hydraulic head of the turbine is less than 10 meters, the turbine can be rotated to generate electricity as long as the drainage pressure is greater than 0.1MPa hydraulic head; it can be seen that as long as the air chamber of the 5 cubic meter pressure-resistant sealed container is pressurized to 2MPa, 90 cubic meters of water can be turned into high-pressure water flow to impact the turbine with a head of less than 10 meters to generate electricity;

[0028] Similarly, if in a pressure-resistant closed container with a volume of 1000 cubic meters, 5 cubic meters are designed as an air chamber, 995 cubic meters are designed as a water chamber filled with water, and compressed air is injected into the 5 cubic meters of the air chamber to 19.8MPa; when 985 cubic meters of water is discharged from the water chamber or the water storage capacity of the water chamber decreases from 995 cubic meters to 10 cubic meters, the volume of the air chamber increases from the original 5 cubic meters to 990 cubic meters, and the pressure of the air chamber decreases to 0.1MPa, that is, P1V1=P2V2,

[0029] Then V1 = 5 cubic meters, V2 = 990 cubic meters (5 + 985), P2 = 0-1 MPa

[0030] P1×5=0.1×990:or P1=19.8MPa

[0031] A hydroelectric power generation system using a high-pressure water storage and high-pressure water flow impact turbine composed of one or more high-pressure sealed containers with small footprint, short construction period, low unit energy storage and power generation investment, low energy consumption, and can be moved replaces the high-water-level damming and water-blocking power generation project, thereby curbing the defects of the high-water-level damming and water-blocking power generation project, such as limited environmental site selection, long construction period, and possible collapse of the water-blocking dam due to war damage, resulting in flood disasters. This is one of the advanced technical features of the present invention;

[0032] The present invention can effectively regulate the water flow pressure and water flow rate entering the water turbine (31) through the pressure regulating valve 1 (15) and the pressure regulating valve 2 (18), thereby ensuring that the water turbine (31) works stably and drives the generator (32) to generate electricity stably, which is one of the advanced technical features of the present invention.

[0033] The compressed air and hydraulic linkage energy storage power generation system of the present invention has the following beneficial effects:

[0034] 1. The present invention uses electric power to drive an air compressor to generate high-pressure air, and stores the high-pressure air in a pressure-resistant sealed water tank for compressed air energy storage; uses a water turbine generator set with mature technology, variable power generation, and stable operation to discharge the water under high pressure in the pressure-resistant water tank, and the water passes through the volute and water guide mechanism of the water turbine in the form of high-pressure water flow, converting the water energy under high pressure into mechanical energy. The runner of the water turbine rotates under the action of high-pressure water force and speed, converting the water energy (kinetic energy, potential energy) into mechanical energy, and the rotating shaft of the water turbine drives the generator to generate electricity; it overcomes the defects of the existing compressed air directly impacting the air turbine, impacting the water turbine or the generator, such as unstable power generation, small power generation, and immature operation of technical equipment;

[0035] 2. The present invention does not require a water pump to lift the water from a low position to a high position, which greatly overcomes the electricity cost of the water pump operation;

[0036] 3. The present invention adopts low-cost high-pressure hydraulic power of compressed air to replace the traditional high-water-level turbine power generation system with large investment in geographical damming and water diversion, and uses the pressure head of water to replace the gravity head of the geographical location. There is no need to send water to a reservoir at a very high position, which solves the problem of difficult site selection in pumped storage.

[0037] 4. The present invention does not require a pumping system, and energy storage power generation does not require a high water level. The scale of energy storage power generation can be large or small, and it is more suitable for urban power storage systems. Moreover, electricity consumption is mainly concentrated in cities. Therefore, the non-pumped energy storage system of compressed air is of great significance for alleviating the peak-shaving pressure of the power grid.

[0038] 5. The biggest difference between the present invention and the traditional compressed air energy storage technology is that the water pump system is replaced by compressed air, and the expander is replaced by a water turbine, which solves the problem of cooling the compressed gas in the compressed air energy storage system during the energy storage process and the problem of heating the high-pressure gas during the power generation process;

[0039] 6. The present invention adopts the pressure regulating valve 1 (15) or the pressure regulating valve 2 (18), which can effectively regulate the water flow pressure and water flow rate entering the water turbine (31), ensure the stable operation of the water turbine (31) and drive the generator (32) to generate electricity stably; BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] Figure 1 This is a simplified diagram of the equipment flow during energy storage and power generation of the present invention;

[0042] Figure 2 This is a simplified flow chart of the device when no power is generated after the energy is released;

[0043] Figure 3This is a simplified diagram of the equipment flow when the present invention stores energy and generates electricity again;

[0044] In the figure: 1-electric air compressor, 2-export, 3-water storage tank 2, 4-valve 3, 5-pressure sensor 1, 6-import 1, 7-valve 4, 8-import 2, 9-air tank 1, 10-liquid level controller 1, 11-pressure water tank 1, 12-valve 5, 13-liquid level controller 2, 14-water storage tank 1, 15-pressure regulating valve 1, 16-drain pipe 1, 17-drain pipe 2, 18-pressure regulating valve 2, 19-pressure water tank 2, 20-air tank 2, 21-liquid level controller 3, 22-liquid level controller 4, 23-pressure sensor 2, 24-import 3, 25-valve 6, 26-import 4, 27-drain pipe 3, 28-valve 7, 29-valve 8, 30-drain pipe 4, 31-turbine, 32-hydraulic generator, 33-import 5; DETAILED DESCRIPTION

[0045] See attached Figure 1 , Figure 2 and Figure 3 , using the surplus electricity at night to store electricity, and releasing the stored electricity to generate electricity during the peak electricity consumption in the daytime; starting the electric air compressor (1), injecting the high-pressure air output by the electric air compressor (1) into the air chamber (9) in the pressure-resistant water tank (11), the air in the air chamber (9) changes from normal pressure air to high-pressure air, and reaches a certain amount of high-pressure value, and the pressure in the air chamber (9) is displayed and monitored by the pressure sensor (5), and the high-pressure air in the air chamber (9) pressurizes the water in the water storage chamber (14) in the pressure-resistant water tank (11), so that the water in the water storage chamber (14) is in a high-pressure energy storage state (see Figure 1 );

[0046] When the turbine (31) is working or releasing stored energy, the five valves, namely, valve three (4), valve seven (28), valve four (7), pressure regulating valve two (18) and valve five (12), are all closed or in a closed state. At the same time, the two valves, namely, valve six (25) and valve eight (29), are all opened or in a free-flowing state. Then, the pressure regulating valve one (15) is opened, and the water under high pressure in the water storage tank one (14) of the pressure-resistant water tank one (11) passes through the pressure regulating valve one (15) and the drainage pipe one (16) as a high-pressure water flow, and passes through the volute and water guide mechanism of the turbine (31), thereby converting water energy into mechanical energy. The runner of the turbine (31) rotates under the pressure and speed of the water, thereby converting water energy (kinetic energy, potential energy) into mechanical energy. The rotating shaft of the turbine (31) drives the generator (32) to generate electricity. In this process, the turbine (31) converts water energy into mechanical energy, while the generator (32) converts mechanical energy into electrical energy through the principle of electromagnetic induction; the water discharged by the turbine (31) is transported to the water storage tank 2 (3) of the pressure-resistant water tank 2 (19) under normal pressure through the drainage pipe 4 (30) and the valve 8 (29); when the water level in the water storage tank 2 (3) of the pressure-resistant water tank 2 (19) rises to the liquid level control position of the liquid level controller 4 (22) or when the water level in the water storage tank 1 (14) of the pressure-resistant water tank 1 (11) drops to the position controlled by the liquid level controller 2 (13), the pressure regulating valve 1 (15) is closed, and the turbine (31) stops running or stops working; at the same time, the pressurized air generated by the continuous rise in the water level and the decrease in volume in the air storage tank 2 (20) is discharged through the valve 6 (25), so that the air storage tank 2 (20) of the pressure-resistant water tank 2 (19) maintains a normal pressure state (see Figure 2 );

[0047] When the generator (32) is working: the runner of the water turbine (31) is coupled to the rotor of the generator (32) through the main shaft, driving the rotor to rotate and cut the stator magnetic coil of the generator (32); using the principle of electromagnetic induction, an induced electromotive force is generated in the coil of the generator (32); in this process, the rotation of the rotor generates a magnetic field, and the stator winding generates an alternating induced electromotive force in it because it cuts the rotating magnetic field of the rotor; when the three-phase stator winding output circuit of the generator (32) is connected to a load, three-phase alternating current is generated to generate electricity, and the electricity is transmitted to users for use or incorporated into the power grid;

[0048] Power generation operation after power storage again:

[0049] The electric air compressor (1) is started, and the high-pressure air output by the electric air compressor (1) is injected into the air chamber (20) in the pressure-resistant water tank (19). The air in the air chamber (20) changes from normal pressure air to high-pressure air and reaches a certain high-pressure value. The pressure in the air chamber (20) is displayed and monitored by the pressure sensor (23). The high-pressure air in the air chamber (20) pressurizes the water in the water chamber (3) in the pressure-resistant water tank (19), so that the water in the water chamber (3) is in a high-pressure energy storage state (see Figure 3 );

[0050] When the water turbine (31) is working or the stored energy is released, the five valves, namely, valve three (4), valve seven (28), valve six (25), pressure regulating valve one (15) and valve eight (29), are all closed or in a closed state. At the same time, the two valves, namely, valve five (12) and valve four (7), are all opened or in a free-flowing state. Then, the pressure regulating valve two (18) is opened. The water under high pressure in the water storage tank two (3) of the pressure-resistant water tank two (19) flows through the pressure regulating valve two (18) and the drainage pipe two (17) as a high-pressure water flow, and through the volute and water guide mechanism of the water turbine (31), the water energy is converted into mechanical energy. The runner of the water turbine (31) rotates under the pressure and speed of the water, and the water energy (kinetic energy, potential energy) is converted into mechanical energy. The rotating shaft of the water turbine (31) drives the generator (32) to generate electricity. In this process, the water turbine (31) converts the water energy into mechanical energy. Mechanical energy, and the generator (32) converts the mechanical energy into electrical energy through the principle of electromagnetic induction to generate electricity, and the electricity is transmitted to users for use or connected to the power grid; the water discharged by the turbine (31) is transmitted to the water storage tank (14) of the pressure-resistant water tank (11) under normal pressure through the drainage pipe (27) and the valve (12); when the water level in the water storage tank (14) of the pressure-resistant water tank (11) rises to the liquid level control position of the liquid level controller (10) or when the water level in the water storage tank (3) of the pressure-resistant water tank (19) drops to the liquid level control position of the liquid level controller (21), the pressure regulating valve (18) is closed, and the turbine (31) stops running or stops working; at the same time, the pressurized air generated by the continuous rise of the water level and the decrease of the volume in the air tank (9) is discharged through the valve (7), so that the air tank (9) of the pressure-resistant water tank (11) maintains a normal pressure state;

[0051] The pressure-resistant water tank 1 (11) and the pressure-resistant water tank 2 (19) implement alternate air pressurization and high-pressure hydraulic release, and use the high-pressure water flow to drive the main shaft of the turbine (31) to rotate and drive the generator (32) to generate electricity. The generated electricity is transmitted to users for use or integrated into the power grid.

Claims

1. A compressed air and hydraulic linkage energy storage power generation system, the system comprising an electric air compressor (1), a pressure regulating valve 1 (15), a pressure regulating valve 2 (18), a valve 3 (4), a valve 4 (7), a valve 5 (12), a valve 6 (25), a valve 7 (28), a valve 8 (29), a pressure water tank 1 (11), a pressure water tank 2 (19), a turbine (31) and a generator (32); Features: The exhaust port of the electric air compressor (1) is connected to the inlet of valve three (4) and the inlet of valve seven (28) through an air pipeline, the outlet of valve three (4) is connected to the inlet one (6) of the top of pressure-resistant water tank one (11) through a pipeline, the outlet of valve seven (28) is connected to the inlet three (24) of the top of pressure-resistant water tank two (19) through a pipeline, the bottom outlet of pressure-resistant water tank one (11) is connected to the inlet five (33) of turbine (31) through a pressure regulating valve one (15) and a drain pipe one (16), the pressure-resistant water tank two (19) is connected to the inlet five (33) of turbine (31) through a pressure regulating valve one (15) and a drain pipe one (16). ) the bottom outlet is connected to the inlet five (33) of the turbine (31) through the pressure regulating valve two (18) and the drain pipe two (17), a connecting shaft is arranged between the turbine (31) and the generator (31), the outlet (2) of the turbine (31) is connected to the inlet two (8) of the upper part of the pressure-resistant water tank one (11) through the drain pipe three (27) and the valve five (12), and the outlet (2) of the turbine (31) is connected to the inlet four (26) of the upper part of the pressure-resistant water tank two (19) through the drain pipe four (30) and the valve eight (29); The pressure-resistant water tank (11) is a pressure-resistant sealed container. The top of the pressure-resistant sealed container is provided with a pressure gauge (5) and a valve (7). The lower part of the pressure-resistant sealed container is a water storage tank (14). The upper part of the pressure-resistant sealed container is an air storage tank (9). The upper part of the water storage tank (14) is an air storage tank (9). A liquid level controller (10) is provided on the upper side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller (10) is provided at a high level line position in the water storage tank (14). A liquid level controller (2) is provided on the lower side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller (10) is provided at a low level line position in the water storage tank (14). The pressure-resistant water tank 2 (19) is a pressure-resistant sealed container. The top of the pressure-resistant sealed container is provided with a pressure gauge 2 (23) and a valve 6 (25). The lower part of the pressure-resistant sealed container is a water storage tank 2 (3). The upper part of the pressure-resistant sealed container is an air storage tank 2 (20). The upper part of the water storage tank 2 (3) is an air storage tank 2 (20). A liquid level controller 4 (22) is provided on the upper side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller 4 (22) is provided at a high level position in the water storage tank 2 (3). A liquid level controller 3 (21) is provided on the lower side of the pressure-resistant sealed container. The liquid level probe of the liquid level controller 3 (21) is provided at a low level position in the water storage tank 2 (3). The electric air compressor (1) is an electrically driven air compressor with an outlet pressure of 0.1 MPa-40 MPa; The water turbine (31) is a power machine that converts the energy of water flow into rotational mechanical energy. It is divided into two categories: impulse water turbine and reaction water turbine. It is a water turbine used in hydropower stations. The higher the water head and the greater the flow rate, the greater the output power of the water turbine. The water turbine drives the generator to generate electricity. The generator (32) is a generator that uses a water turbine (31) as a prime mover to convert water energy into electrical energy. When water flows through the water turbine (31), the water energy is converted into mechanical energy. The rotating shaft of the water turbine (31) drives the rotor of the generator (32) to convert the mechanical energy into electrical energy for output. It is a power generation equipment of a hydropower station. The pressure regulating valve 1 (15) and the pressure regulating valve 2 (18) are self-operated balancing valves, flow control valves, and flow balancing valves, and are control devices for flow regulation and pressure regulation. The flow regulating valves used in the pipeline network can directly set the flow according to the design, automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline, and keep the set flow unchanged regardless of how the system pressure changes.

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