Water pumping compressed gas phase change heat and energy storage system

Abstract

The invention relates to a water pumping compressed gas phase change heat and energy storage system, and belongs to the technical field of energy storage power generation. The water pumping and gas compressing phase change heat and energy storage system comprises a water-gas co-containing tank, a water pumping generator set, a water storage tank, a phase change energy storage power generation subsystem and a current stabilizer, wherein the water pumping generator set is communicated with the water-gas co-containing tank; the water storage tank is communicated with the pumping generator set; the phase change energy storage power generation subsystem is communicated with the water storage tank and the water-gas co-containing tank, and water in the water storage tank enters the phase change energy storage power generation subsystem; the current stabilizer is installed on the phase change energy storage power generation subsystem. Therefore, according to the water pumping and gas compressing phase change heat storage and energy storage system, energy storage and power generation are achieved in one or more modes of water pumping energy storage and power generation, gas compressing energy storage and power generation and phase change energy storage and power generation, and a current stabilizer is arranged in the phase change energy storage and power generation subsystem to stabilize steam flow, so that the phase change energy storage and power generation subsystem can better store energy and generate power; the power generation effect is more stable, and the power generation efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage power generation, and particularly relates to a pumped water pressure gas phase change heat storage energy storage system. Background Art

[0002] Energy storage technology refers to the process of storing energy through media or equipment and releasing it when needed. It is an important means to achieve efficient utilization of energy and ensure the stable operation of the power system. Energy storage technology can be divided into mechanical energy storage, electrochemical energy storage, thermal energy storage, etc. according to different media. Energy storage technology can be used for peak shaving and frequency modulation, voltage support and distributed energy access of the power system, improving the flexibility and reliability of the power grid operation.

[0003] Most of the existing energy storage power generation technologies rely on a single energy storage method, such as lithium-ion battery energy storage, pumped storage, compressed air energy storage, etc. Although these technologies have their own advantages, the single energy storage method in energy storage power generation technology easily leads to unstable power generation effects. Summary of the Invention

[0004] The present invention provides a pumped water pressure gas phase change heat storage energy storage system to solve the technical problem of unstable power generation effect in the current energy storage power generation system.

[0005] The present invention is realized by the following technical solutions: A pumped water pressure gas phase change heat storage energy storage system includes a water-gas coexistence tank, a pumped water generating set, a water storage tank, a phase change energy storage power generation subsystem, and a flow stabilizer. The pumped water generating set is connected to the water-gas coexistence tank, and the water-gas coexistence tank is used to provide high-pressure gas to press water into the pumped water generating set for power generation; the water storage tank is connected to the pumped water generating set, and the water after being generated by the pumped water generating set is stored in the water storage tank. The pumped water generating set is used to pump the water in the water storage tank into the water-gas coexistence tank for storage; the phase change energy storage power generation subsystem is connected to the water storage tank and the water-gas coexistence tank. The water in the water storage tank enters the phase change energy storage power generation subsystem, and the phase change energy storage power generation subsystem heats and stores energy for power generation, and then enters the water-gas coexistence tank; the flow stabilizer is installed in the phase change energy storage power generation subsystem to stabilize the flow of the steam generated by heating through the phase change energy storage power generation subsystem.

[0006] Optionally, the flow stabilizer includes a tank body and a flow stabilizing plate. The tank body has a storage space; the flow stabilizing plate is installed in the storage space, the flow stabilizing plate is coaxially arranged with the tank body, and a plurality of through holes are opened on the flow stabilizing plate. The through holes are uniformly distributed along the axial direction of the flow stabilizing plate, and the steam passes through the through holes to stabilize the flow of the steam.

[0007] Optionally, the phase change energy storage power generation subsystem includes a molten salt furnace and a steam turbine. One end of the molten salt furnace is connected to the water storage tank, and the molten salt furnace is used to heat water. The steam turbine is connected to the molten salt furnace. Steam enters the steam turbine to drive the steam turbine to rotate and generate electricity. After the steam drives the steam turbine, it enters the water-vapor coexistence tank. The flow stabilizer is installed between the molten salt furnace and the steam turbine to stabilize the flow of the steam generated by the molten salt furnace.

[0008] Optionally, it further includes a branch pipe. One end of the branch pipe is connected to the water-vapor coexistence tank, and the other end is connected to the molten salt furnace.

[0009] Optionally, it further includes a pressure water tank, and the pressure water tank is installed on the branch pipe.

[0010] Optionally, it further includes a high-pressure pump. One end of the high-pressure pump is connected to the pressure water tank, and the other end is connected to the molten salt furnace.

[0011] Optionally, it further includes an air compressor. The air compressor is connected to the water-vapor coexistence tank to provide air for the water-vapor coexistence tank and increase the pressure in the water-vapor coexistence tank.

[0012] Optionally, it further includes an accumulator, and the accumulator is installed between the pumped storage generating unit and the water storage tank.

[0013] Optionally, the accumulator includes a bladder, a pressure sensor, a hydraulic pump, and an electromagnetic directional control valve. The bladder is connected to the pumped storage generating unit and the water storage tank. The pressure sensor is connected to the bladder to detect the pressure in the bladder. Both the hydraulic pump and the electromagnetic directional control valve are connected to the bladder.

[0014] The present invention has the following beneficial effects compared with the prior art:

[0015] A pumped hydro-pressurized gas phase change heat storage energy storage system provided by the present invention includes a water-vapor coexistence tank, a pumped storage generating unit, a water storage tank, a phase change energy storage power generation subsystem, and a flow stabilizer. The pumped storage generating unit is connected to the water-vapor coexistence tank. The water-vapor coexistence tank is used to provide high-pressure gas to pump water into the pumped storage generating unit for power generation. The water storage tank is connected to the pumped storage generating unit. The water after being generated by the pumped storage generating unit is stored in the water storage tank. The pumped storage generating unit is used to pump the water in the water storage tank into the water-vapor coexistence tank for storage. The phase change energy storage power generation subsystem is connected to the water storage tank and the water-vapor coexistence tank. The water in the water storage tank enters the phase change energy storage power generation subsystem. The phase change energy storage power generation subsystem heats and stores energy for power generation, and then enters the water-vapor coexistence tank. The flow stabilizer is installed in the phase change energy storage power generation subsystem to stabilize the flow of the steam generated by heating through the phase change energy storage power generation subsystem.

[0016] Through the above structure, a pumping pressure gas-phase change heat storage energy storage system provided by the present invention can provide pressure energy storage through a water-gas coexistence tank, and use the provided high-pressure gas to pump water into a pumped-storage generator set for power generation. It can also pump water into the water-gas coexistence tank for storage through the pumped-storage generator set, and can also pump water into the phase change energy storage power generation subsystem for heating energy storage and power generation. The flow stabilizer stabilizes the steam generated during the heating process of the phase change energy storage power generation subsystem, reduces the pressure fluctuation in the pipeline, makes the pressure and flow pulsation of the pipeline stable, and the water in the water storage tank enters the water-gas coexistence tank after passing through the phase change energy storage power generation subsystem, realizing the recycling of water. Therefore, the pumping pressure gas-phase change heat storage energy storage system stores and generates electricity through one or more of the ways of pumped-storage power generation, compressed-air energy storage power generation and phase change energy storage power generation, and a flow stabilizer is arranged in the phase change energy storage power generation subsystem to stabilize the steam, enabling the phase change energy storage power generation subsystem to store and generate electricity better, making the power generation effect more stable and improving the power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of a pumping pressure gas-phase change heat storage energy storage system provided by the present invention;

[0019] Figure 2 is a schematic structural diagram of an accumulator in an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a flow stabilizer in an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a flow stabilizing plate in an embodiment of the present invention.

[0022] In the figure:

[0023] 1 - water-gas coexistence tank; 2 - pumped-storage generator set; 3 - water storage tank; 4 - phase change energy storage power generation subsystem; 41 - molten salt furnace; 42 - steam turbine; 5 - flow stabilizer; 51 - tank body; 52 - flow stabilizing plate; 6 - branch pipe; 7 - pressure water tank; 8 - high-pressure pump; 9 - air compressor; 10 - accumulator; 101 - bladder; 102 - pressure sensor; 103 - hydraulic pump; 104 - electromagnetic directional valve; 11 - water pump; 12 - valve; 13 - flowmeter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0025] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0026] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present invention.

[0028] The present invention provides a pumped water pressure gas phase change heat storage energy storage system to solve the technical problem of unstable power generation effect in the current energy storage power generation system. The pumped water pressure gas phase change heat storage energy storage system includes a water-gas co-tank 1, a pumped water generating unit 2, a water storage tank 3, a phase change energy storage power generation subsystem 4, and a flow stabilizer 5, wherein:

[0029] The pumped - storage generating unit 2 is connected to the water - gas co - storage tank 1. The water - gas co - storage tank 1 is used to provide high - pressure gas to pump water into the pumped - storage generating unit 2 for power generation. At the same time, the pumped - storage generating unit 2 can also pump water into the water - gas co - storage tank 1 to store water in the water - gas co - storage tank 1. Optionally, the height of the water - gas co - storage tank 1 should be higher than that of the pumped - storage generating unit 2, so as to facilitate the flow of water in the water - gas co - storage tank 1 to the pumped - storage generating unit 2, and then generate electricity through the pumped - storage generating unit 2. The high - pressure gas in the water - gas co - storage tank 1 can better push the water to flow towards the pumped - storage generating unit 2, as Figure 1 shown. A plurality of groups of valves 12 are provided on the water - gas co - storage tank 1 to facilitate opening to discharge the gas in the water - gas co - storage tank 1 to reduce the pressure in the water - gas co - storage tank 1. The pumped - storage generating unit 2 and the water - gas co - storage tank 1 are connected through a pipeline, and a flow meter 13 can be set on the pipeline to detect the water volume flowing through the pipeline.

[0030] The water storage tank 3 is connected to the pumped - storage generating unit 2. The water storage tank 3 and the pumped - storage generating unit 2 are connected by a pipeline. The water storage tank 3 is used to store the water that has passed through the pumped - storage generating unit 2. At the same time, the water in the water storage tank 3 can also be re - pumped into the water - gas co - storage tank 1 through the pumped - storage generating unit 2 for recycling. The water - gas co - storage tank 1 can drain water to the pumped - storage generating unit 2 for power generation during peak electricity consumption, and pump water from the water storage tank 3 to the water - gas co - storage tank 1 through the pumped - storage generating unit 2 during off - peak electricity consumption. At least one group of valves 12 is provided between the water storage tank 3 and the pumped - storage generating unit 2, and between the pumped - storage generating unit 2 and the water - gas co - storage tank 1 to facilitate controlling the on - off of the water flow.

[0031] The phase - change energy - storage power generation subsystem 4 is connected to the water storage tank 3 and the water - gas co - storage tank 1. The water in the water storage tank 3 enters the phase - change energy - storage power generation subsystem 4. The phase - change energy - storage power generation subsystem 4 heats the water for energy storage and power generation, and then enters the water - gas co - storage tank 1. Pumping the water in the water storage tank 3 to the phase - change energy - storage power generation subsystem 4, the phase - change energy - storage power generation subsystem 4 can use energy to heat and store energy in the water, and use the heated water for power generation. It can also supplement or absorb the heat during the compression and expansion processes of the air in the water - gas co - storage tank 1. The heat of the phase - change energy - storage power generation system comes from external energy sources such as solar energy and natural gas. The water storage tank 3 and the phase - change energy - storage power generation subsystem 4 are connected through a pipeline, and a water pump 11 is provided on the pipeline to pump the water in the water storage tank 3 to the phase - change energy - storage power generation subsystem 4.

[0032] The flow stabilizer 5 is installed in the phase - change energy - storage power generation subsystem 4. The phase - change energy - storage power generation subsystem 4 stores energy and generates power by heating water. The flow stabilizer 5 is used to stabilize the steam generated during the heating process of the phase - change energy - storage power generation subsystem 4. The flow stabilizer 5 can suppress the pipeline pulsation and the water hammer phenomenon in the system caused by positive - displacement pumps or compressors such as piston pumps and diaphragm pumps, reduce the pressure fluctuation in the pipeline, make the pressure and flow pulsation of the pipeline stable, and thus reduce the interference to the phase - change energy - storage power generation process and improve the energy - storage power generation efficiency.

[0033] With the above structure, a pumped hydro-pneumatic phase change thermal energy storage and power generation system provided by the present invention can provide pressure energy storage through the water-gas coexistence tank 1, and use the provided high-pressure gas to pump water into the pumped hydro-generating unit 2 for power generation. It can also pump water into the water-gas coexistence tank 1 for storage through the pumped hydro-generating unit 2, or pump water into the phase change energy storage power generation subsystem 4 for heating energy storage and power generation. The flow stabilizer 5 stabilizes the steam generated during the heating process of the phase change energy storage power generation subsystem 4, reduces the pressure fluctuations in the pipeline, and stabilizes the pressure and flow pulsation of the pipeline. The water in the water storage tank 3 enters the water-gas coexistence tank 1 after passing through the phase change energy storage power generation subsystem 4, enabling the recycling of water. Therefore, the pumped hydro-pneumatic phase change thermal energy storage and power generation system stores and generates power through one or more of the pumped hydro energy storage power generation, compressed air energy storage power generation, and phase change energy storage power generation methods, and a flow stabilizer 5 is provided in the phase change energy storage power generation subsystem 4 to stabilize the steam flow, so that the phase change energy storage power generation subsystem 4 can better store and generate power, improving the power generation efficiency.

[0034] An optional implementation manner of this embodiment is as follows: The flow stabilizer 5 includes a tank body 51 and a flow stabilizing plate 52. The tank body 51 has a storage space for accommodating the passing steam. Specifically, an inlet and an outlet communicating with the storage space are respectively provided at both ends of the tank body 51, and a cleaning port for facilitating the discharge of water in the storage space is provided at the bottom; The flow stabilizing plate 52 is installed in the storage space. The flow stabilizing plate 52 is used to stabilize the flow of the steam passing through the storage space. The flow stabilizing plate 52 is coaxially arranged with the tank body 51 so that the moving direction of the steam is perpendicular to the throttle plate. A plurality of through holes are opened on the flow stabilizing plate 52 to enable the steam to move along the axial direction of the tank body 51 through the through holes. The plurality of through holes are uniformly distributed along the axial direction of the flow stabilizing plate 52, and the steam uniformly passes through the flow stabilizing plate 52. The flow stabilizer 5 is mainly used to stabilize the pressure of the steam. Specifically, when the steam enters the tank body 51, it first passes through a throttling element, such as a throttle plate, according to Bernoulli's equation

[0035]

[0036] In the formula: p is the pressure at a certain point in the fluid, ρ is the density of the fluid, v is the flow velocity of the fluid at this point, h is the height of this point relative to a certain reference plane, g is the acceleration due to gravity, and C is a constant.

[0037] And according to the flow formula

[0038] Q = A×V

[0039] In the formula: Q is the flow rate, A is the flow area, and v is the flow velocity.

[0040] There is an interconversion relationship between the velocity and pressure of a fluid. When steam passes through the orifice of a throttle orifice plate, due to the sudden reduction in the flow area, with the steam flow rate remaining unchanged, the velocity of the steam will increase while the pressure will decrease. And due to the uniform distribution of the gaps in the flow stabilizer plate, the steam can be more evenly distributed after flowing out of the flow stabilizer plate, thereby achieving the purpose of stabilizing the steam. A valve is provided between the tank body and the molten salt furnace to control the on-off of the steam between the molten salt furnace and the tank body. A plurality of valves arranged in parallel are provided between the tank body and the steam turbine to form an exhaust valve group to control the flow of the rectified gas towards the steam turbine direction.

[0041] An optional implementation manner of this embodiment is as follows: The phase change energy storage power generation subsystem 4 includes a molten salt furnace 41 and a steam turbine 42. One end of the molten salt furnace 41 is connected to the water storage tank 3 through a pipeline. The water in the water storage tank 3 enters the molten salt furnace 41. The molten salt furnace 41 is used to heat the water. The molten salt furnace 41 can be heated using energy such as solar energy and natural gas, and heat the molten salt furnace 41 by means of photovoltaic and other methods to cause molten salt phase change, store light energy and other energies as heat energy in the molten salt furnace 41, and the stored heat energy heats the water body inside the molten salt furnace 41, and the water body vaporizes, so that the molten salt furnace 41 generates steam; the steam turbine 42 is connected to the molten salt furnace 41. The molten salt furnace 41 heats water to generate steam, and the steam is transported to the steam turbine 42 through a pipeline and drives the steam turbine 42 to rotate and generate electricity. The exhaust waste heat of the steam turbine 42 provides heat for the water-air coexistence tank 1 through a pipeline, and supplements heat while absorbing heat during the air compression and expansion in the water-air coexistence tank 1 to improve the energy storage efficiency. The flow stabilizer 5 is installed between the molten salt furnace 41 and the steam turbine 42 to stabilize the steam generated by the molten salt furnace 41 and then transport stable steam to the steam turbine 42. A plurality of valves 12 arranged in parallel are provided between the water pump 11 and the molten salt furnace 41 to form an inlet solenoid valve group to control the on-off of the water flow between the water tank and the molten salt furnace 41.

[0042] In order to reduce the insufficient pipeline transportation capacity caused by pressure, the fluid cannot reach the predetermined position, or safety accidents such as pipeline leakage and rupture caused by too high pressure, the pipeline diameter, length, material, and pump power can be reasonably selected by accurately calculating the pressure drop. In order to enable the high-temperature steam generated when the molten salt furnace heats water to pass through the pipeline safely and quickly, it can be calculated by the following formula. The calculation formula for the pressure drop during the transportation process is as follows:

[0043]

[0044] In the formula: Δp is the pipeline pressure drop, ρ is the steam density, u is the steam velocity, f is the friction factor along the path, l is the length of the straight pipe section, ξ is the local resistance coefficient, di is the inner diameter of the pipeline, and G is the steam mass flow rate.

[0045] After simplifying the above two formulas, we get:

[0046]

[0047] This formula is the general formula for the pressure drop of the straight pipe sections of all steam pipelines in the entire system. It should be noted that the steam-related parameters remain unchanged within a certain period of time. Due to the different lengths, inner diameters, and pipe materials of each pipe section, the pipe pressure drops will still be different. Therefore, it is necessary to calculate the pressure drops of each different pipe section separately.

[0048] (2) Formula for the change in system heat:

[0049]

[0050] In the formula:

[0051] Q is the heat dissipation of the pipeline, K is the overall heat transfer coefficient, A is the heat dissipation area of the pipeline, t1 is the starting temperature of transportation, t2 is the ending temperature of transportation, ta is the ambient temperature, and cp is the average specific heat capacity of steam between t1 and t2.

[0052] The main changes in system temperature occur in the pipeline, as well as during steam generation and transportation. Under relatively stable operating conditions, the starting temperature of transportation, the ending temperature of transportation, the ambient temperature, the heat dissipation area of the pipeline, and the average specific heat capacity are all relatively stable. Through this formula, the amount of heat loss during steam transportation can be known, thereby calculating the heat loss of the system. If the heat loss is large, methods such as reducing the inner diameter and pipeline length can be used to reduce the loss and improve the thermal efficiency of the system.

[0053] (3) Frictional loss: Frictional loss is mainly related to the friction of fluid flow. To reduce frictional loss, the appropriate pipe diameter can be accurately selected according to the given flow rate and the allowable pressure drop range. When designing a pipeline system, understanding frictional loss helps to reasonably plan the pipeline routing and length. By calculating the frictional losses of different paths, the optimal pipeline layout plan can be selected to reduce unnecessary pressure losses and improve the transportation efficiency of the system. In this system, frictional loss mainly occurs during the pumped storage stage and in the relevant pipelines through which the water flows. The frictional loss can be calculated using the Darcy - Weisbach formula, and the formula is as follows:

[0054]

[0055] In the formula:

[0056] h is the frictional head loss, λ is the frictional resistance coefficient, L is the pipeline length, d is the inner diameter of the pipeline, V is the average flow velocity, and g is the acceleration due to gravity.

[0057] Since the lengths and inner diameters of different pipes are different, which indirectly affects the frictional resistance coefficient, only g is a constant in the formula. The frictional losses of each different pipe section need to be calculated separately.

[0058] (4) Calculation of pumping head:

[0059] The virtual head is relative to the actual head and is an equivalent head concept adopted in specific analyses and calculations. It is not the actual physical head height. Instead, it is an equivalent head value obtained through conversion after comprehensively considering the water flow energy states at the inlet and outlet of the water turbine, the hydraulic losses in the pipeline system, and other influencing factors. It is used to more accurately evaluate and analyze the energy conversion efficiency and power generation capacity of the hydropower system, etc. In this system, the calculation of the pumping head mainly calculates the head of the pumped-storage unit part:

[0060]

[0061] Among them:

[0062] H is the head; p1 and p2 are the pressures of the liquid at the inlet and outlet of the pump, v1 and v2 are the flow velocities of the liquid at the inlet and outlet of the pump, z1 and z2 are the inlet and outlet heights, ρ is the liquid density, and g is the acceleration due to gravity.

[0063] An alternative implementation of this embodiment is as follows: It further includes a branch pipe 6. One end of the branch pipe 6 is connected to the water-air co-capacity tank 1, and the other end is connected to the molten salt furnace 41. The waste heat of the exhaust gas of the steam turbine 42 provides heat for the water-air co-capacity tank 1 through a pipeline, or can directly return to the molten salt furnace 41 through the branch pipe 6 for heating, thereby reducing heat loss.

[0064] An alternative implementation of this embodiment is as follows: It further includes a pressure water tank 7. The pressure water tank 7 is installed on the branch pipe 6. The pressure water tank 7 is used to balance the water pressure in the branch pipe 6. The water flowing back through the branch pipe 6 enters the pressure water tank 7 and then is sent into the molten salt furnace 41.

[0065] An alternative implementation of this embodiment is as follows: It further includes a high-pressure pump 8. One end of the high-pressure pump 8 is connected to the pressure water tank 7, and the other end is connected to the molten salt furnace 41. The water in the water-air co-capacity tank 1 directly enters the pressure water tank 7 through the branch pipe 6, and after passing through the pressure water tank 7, it is pumped into the molten salt furnace 41 by the high-pressure pump 8 for heating, thereby reducing heat loss. The high-pressure pump 8 is used to transport water and regulate the water volume.

[0066] An alternative implementation of this embodiment is as follows: It further includes an air compressor 9. The air compressor 9 is connected to the water-air co-capacity tank 1. The air compressor 9 is used to supply air into the water-air co-capacity tank 1, thereby increasing the pressure in the water-air co-capacity tank 1 so that when it is necessary to generate electricity using the water in the water-air co-capacity tank 1, the pressure in the water-air co-capacity tank 1 can pump out the water.

[0067] An alternative implementation of this embodiment is as follows: It further includes an accumulator 10, which is installed between the pumped-storage generating unit 2 and the water storage tank 3. The accumulator 10 is used to actively store energy and release energy according to specific circumstances during pumping or power generation using water.

[0068] Specifically, as Figure 2 shown, the accumulator 10 in this embodiment includes a bladder, a pressure sensor 102, a hydraulic pump 103, and an electromagnetic directional valve 104. The bladder is connected to the pumped-storage generating unit 2 and the water storage tank 3. The pressure sensor 102 is connected to the bladder to detect the pressure inside the bladder. Both the hydraulic pump 103 and the electromagnetic directional valve 104 are connected to the bladder. In this embodiment, the accumulator 10 is provided with two bladders in total, and the hydraulic sensors correspond to the bladders one by one to detect the pressures inside the two bladders respectively. When the pressures inside the two bladders change, the electromagnetic directional valve 104 inputs the required current, and the hydraulic pump 103 pumps liquid into the bladder to adjust the pressure. When it is necessary to discharge the liquid inside the bladder, the hydraulic pump 103 pumps hydraulic oil into the bladder to discharge the water inside the accumulator 10. The A port and the B port of the accumulator 10 are connected to the water storage tank 3 and the pumped-storage generating unit 2 respectively through pipelines.

[0069] In summary, the pumped-water pressure gas-phase change heat storage and energy storage system provided by the present invention can provide pressure energy storage through the water-gas co-capacity tank 1, and use the high-pressure gas provided by the air compressor 9 to press water into the pumped-storage generating unit 2 for power generation. It can also pump water into the water-gas co-capacity tank 1 for storage through the pumped-storage generating unit 2. It can also pump water into the lava furnace through the water pump 11 for heating and then generate electricity through the steam turbine 42. The flow stabilizer 5 stabilizes the steam generated during the heating process of the molten salt furnace 41, reduces the pressure fluctuations in the pipeline, and makes the pressure and flow pulsation in the pipeline stable. The water in the water storage tank 3 generates electricity through the phase change energy storage power generation subsystem 4 to supplement or absorb the heat during the compression and expansion processes inside the water-gas co-capacity tank 1. It can also cool the steam and store it back in the water-gas co-capacity tank 1. The water in the water-gas co-capacity tank 1 can generate electricity again through the pumped-storage generating unit 2, or the water can be pumped through the branch pipe 6 by the high-pressure pump 8, passed through the pressure water tank 7, and then re-entered the molten salt furnace 41 for reheating and then generate electricity through the steam turbine 42 to make the water cycle. Therefore, the pumped-water pressure gas-phase change heat storage and energy storage system stores and generates electricity through one or more of the pumped-water energy storage power generation, compressed-air energy storage power generation, and phase change energy storage power generation methods, and a flow stabilizer 5 is provided in the phase change energy storage power generation subsystem 4 to stabilize the steam, enabling the phase change energy storage power generation subsystem 4 to store and generate electricity better, making the power generation effect more stable and improving the power generation efficiency.

[0070] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded in the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the said claims.

Claims

1. A water pumping pressure gas phase change heat storage energy storage system, characterized in that, Including: A water-vapor compatible tank, a pumped-storage generating set, a water storage tank, a phase change energy storage power generation subsystem, and a flow stabilizer. The pumped-storage generating set is connected to the water-vapor compatible tank, and the water-vapor compatible tank is used to provide high-pressure gas to pump water into the pumped-storage generating set for power generation. The water storage tank is connected to the pumped-storage generating set, and the water after being generated by the pumped-storage generating set is stored in the water storage tank. The pumped-storage generating set is used to pump the water in the water storage tank into the water-vapor compatible tank for storage. The phase change energy storage power generation subsystem is connected to the water storage tank and the water-vapor compatible tank. The water in the water storage tank enters the phase change energy storage power generation subsystem, and the phase change energy storage power generation subsystem heats and stores energy in the water for power generation, and then enters the water-vapor compatible tank. The flow stabilizer is installed in the phase change energy storage power generation subsystem to stabilize the flow of the steam generated by heating in the phase change energy storage power generation subsystem.

2. The water pumping pressure gas phase change heat storage and energy storage system according to claim 1, characterized in that, The flow stabilizer includes: A tank body, which has a storage space inside. A flow stabilizing plate, which is installed in the storage space. The flow stabilizing plate is coaxially arranged with the tank body. The flow stabilizing plate is provided with a plurality of through holes, and the through holes are uniformly distributed along the axial direction of the flow stabilizing plate. The steam passes through the through holes to stabilize the flow of the steam.

3. The pumped water pressure gas phase change heat storage energy storage system according to claim 1, characterized in that The phase change energy storage power generation subsystem includes: A molten salt furnace, one end of which is connected to the water storage tank, and the molten salt furnace is used to heat water. A steam turbine, which is connected to the molten salt furnace. The steam enters the steam turbine to drive the steam turbine to rotate for power generation. After the steam drives the steam turbine, it enters the water-vapor compatible tank. The flow stabilizer is installed between the molten salt furnace and the steam turbine to stabilize the flow of the steam generated by the molten salt furnace.

4. The water extraction pressure gas phase change heat storage and energy storage system according to claim 3, characterized in that, It also includes: A branch pipe, one end of which is connected to the water-vapor compatible tank, and the other end is connected to the molten salt furnace.

5. A pumped water pressure gas phase change heat storage and energy storage system according to claim 4, characterized in that It also includes: A pressure water tank, which is installed on the branch pipe.

6. The pressure pumping gas-phase change heat storage energy storage system according to claim 5, characterized in that, It also includes: A high-pressure pump, one end of which is connected to the pressure water tank, and the other end is connected to the molten salt furnace.

7. A water extraction pressure gas phase change heat storage and energy storage system according to claim 1, characterized in that, It also includes: An air compressor, which is connected to the water-vapor compatible tank to provide air for the water-vapor compatible tank and increase the pressure inside the water-vapor compatible tank.

8. A water pumping pressure gas phase change heat storage and energy storage system according to claim 1, characterized in that, It also includes: An accumulator, which is installed between the pumped-storage generating set and the water storage tank.

9. A water pumping pressure gas phase change heat storage and energy storage system according to claim 8, characterized in that, The accumulator includes: A bladder, a pressure sensor, a hydraulic pump, and an electromagnetic directional valve. The bladder is connected to the pumped-storage generating set and the water storage tank. The pressure sensor is connected to the bladder to detect the pressure inside the bladder. Both the hydraulic pump and the electromagnetic directional valve are connected to the bladder.

Images