CN112128086B - Buoyancy feedback type hydraulic constant-pressure energy storage and release system and method - Google Patents
Buoyancy feedback type hydraulic constant-pressure energy storage and release system and method Download PDFInfo
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- 230000005611 electricity Effects 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 7
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- 238000004321 preservation Methods 0.000 claims description 48
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- 230000007613 environmental effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a buoyancy feedback type hydraulic constant-pressure energy storage and release system and method. The bottom of the air storage tank is connected with the water surface floating platform by using a cable to bypass the fixed pulley, and when the system stores and releases air, the buoyancy feedback function of the water surface floating platform can ensure the constant air pressure in the air storage tank. The length of the cable is adjusted by the motor to adjust the working depth of the air storage tank, so as to set the working pressure of the system. In the electricity consumption valley period, the system drives a motor-generator by using electric energy of a power grid and drives a multi-stage compressor to work, and the multi-stage compressor compresses high-pressure gas into a constant-pressure gas storage tank; and in the electricity consumption peak period, the high-pressure gas in the constant-pressure gas storage tank is released, the high-pressure gas expands in a turbine to do work, and the turbine drives the motor-generator to output electric energy. When the system is stationary, the air pressure in the constant-pressure air storage tank is kept constant by utilizing the static pressure characteristic of water. The invention utilizes the static pressure characteristic of water and the mechanical feedback action of buoyancy, thereby realizing constant-pressure gas storage and gas release.
Description
Technical Field
The invention relates to the field of compressed gas energy storage, in particular to a buoyancy feedback type hydraulic constant-pressure energy storage and release system and method.
Background
In recent years, renewable energy sources in China are rapidly developed. The generating capacity of the 2019 national renewable energy reaches 2.04 trillion kilowatt-hours and accounts for 27.9% of the total generating capacity. Wherein, the accumulated wind power generation and solar energy generation amounts are 3577.4 hundred million kilowatt hours and 1172.2 hundred million kilowatt hours respectively, and the accumulated output speeds are 7.0% and 13.3% respectively. However, the renewable energy source has strong volatility, obvious intermittence, large-scale grid connection is not beneficial to factors such as power grid stability, construction lag of a power transmission channel and the like, so that the supply is unstable, the grid connection is difficult, and the consumption of the renewable energy source is limited. For this country, it is explicitly proposed to drive the energy storage system to operate in coordination with renewable energy.
In the aspect of terrain site selection, the existing water pumping energy storage system needs to build a reservoir and a dam, site selection is difficult, and the building period is as long as 7-10 years; in terms of investment cost, the initial investment cost is high, a large amount of land resources are required to be occupied, and the problem of immigration is required to be considered; in terms of environmental impact, the environmental impact is large, which leads to some ecological problems.
The existing storage battery energy storage system has the disadvantages of high unit energy storage cost, low power level, incapability of large-scale arrangement, short working life, slow charge and discharge, large environmental pollution and difficulty in working in places with severe environments.
In the existing constant-volume energy storage system, the pressure of gas in a gas storage tank changes at time when energy is stored and released, so that a gas compressor and a turbine run away from a design working condition, and the system efficiency is low.
The existing spring type underwater constant-pressure energy storage and release system utilizes a spring to pull an air storage tank to adjust the depth of the air storage tank when controlling constant pressure, thereby ensuring constant pressure of gas in the air storage tank. However, the stiffness coefficient of the spring is liable to change with the aging of the spring, and once the stiffness coefficient is changed, the gas constant pressure cannot be controlled.
The existing motor-cable type underwater constant-pressure energy storage and release system pulls the air storage tank through the motor-cable to adjust the depth of the air storage tank when storing and releasing air, so that the constant pressure of the air in the air storage tank is ensured. The system can consume electric energy when the motor pulling the air storage tank is controlled by constant pressure.
When the existing motor-cable type underwater constant-pressure energy storage and release system uses a motor-cable structure to control the constant pressure of gas in a gas storage tank, the depth of the liquid level in the gas storage tank and the included angle between the cable and the horizontal plane are required to be monitored in real time so as to calculate the required motor moment, and then the motor is regulated and controlled. This control process requires the design of an automatic control system for each sensor and motor.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a buoyancy feedback type hydraulic constant-pressure energy storage and release system and a buoyancy feedback type hydraulic constant-pressure energy storage and release method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a buoyancy feedback type hydraulic constant-pressure energy storage and release system comprises a water surface floating platform, a multi-stage air compressor, a motor-generator, a multi-stage air turbine, a three-way valve and a constant-pressure air storage tank,
The water surface floating platform is arranged close to the water surface and is suspended in the water, the position of the water surface floating platform in the water along the vertical direction is adjustable,
The multi-stage compressor, the motor-generator and the multi-stage air turbine are positioned above the water surface floating platform, the multi-stage compressor and the multi-stage air turbine are respectively connected with the motor-generator through wires, the outlet of the multi-stage compressor and the inlet of the multi-stage air turbine are respectively connected with the first port and the second port of the three-way valve through a first gas transmission pipeline and a second gas transmission pipeline,
The constant-pressure air storage tank is positioned below the water surface and has an adjustable distance relative to the water surface, the constant-pressure air storage tank comprises a water inlet and a water outlet, the water inlet and the water outlet are connected with a third port of the three-way valve through a third air transmission pipeline,
When gas is stored and released, the distance from the liquid level in the constant-pressure gas storage tank to the water surface is constant.
Further, still include motor, hawser, fixed platform under water, first fixed pulley and second fixed pulley, the motor is used for controlling the receive and release of hawser, the motor with first fixed pulley is fixed to be set up on the surface of water floating platform, fixed platform under water is located the below of constant voltage gas holder, the fixed setting of second fixed pulley is in under water on the fixed platform, the one end of hawser with the motor is connected, the other end twines in proper order first fixed pulley with behind the second fixed pulley with constant voltage gas holder fixed connection.
Further, the water surface floating platform and the constant pressure air storage tank are respectively connected with the vertical guide rail in a sliding manner.
Further, the number of the cables, the motor and the vertical guide rails is at least 2, and the cables, the motor and the vertical guide rails are symmetrically arranged about the constant-pressure air storage tank.
Further, a water inlet and outlet electric gate is arranged at the water inlet and outlet of the constant-pressure air storage tank, the water inlet and outlet electric gate is connected with one end of a third air transmission pipeline, and the other end of the third air transmission pipeline is connected with the third port of the three-way valve.
Further comprises a cold storage medium heat preservation tank, a heat storage medium heat preservation tank, a first heat exchange pipeline and a second heat exchange pipeline,
The heat preservation tank of the storage Leng Jiezhi is fixed on the water surface floating platform, the heat preservation tank of the storage Leng Jiezhi is used for storing cold medium, the heat preservation tank of the storage Leng Jiezhi comprises a cold storage outlet and a cold storage inlet, one end of the first heat exchange pipeline is communicated with the cold storage outlet, the other end of the first heat exchange pipeline is communicated with the cold storage inlet after passing through the vicinity of each stage of the multistage compressor and the vicinity of the multistage air turbine outlet in sequence,
The heat storage medium heat preservation tank is fixed on the water surface floating platform, the heat storage medium is stored in the heat storage medium heat preservation tank, the heat storage medium heat preservation tank comprises a heat storage outlet and a heat storage inlet, one end of the second heat exchange pipeline is communicated with the heat storage outlet, and the other end of the second heat exchange pipeline sequentially passes through the vicinity of each stage of the multi-stage air turbine and the vicinity of the outlet of the multi-stage air compressor and then is communicated with the heat storage inlet.
Further, the parts of the first heat exchange pipeline and the second heat exchange pipeline, which are positioned between the stages of the multistage compressor, the multistage air turbine outlet, the stages of the multistage air turbine and the vicinity of the multistage compressor outlet, are made of heat conducting materials, and the rest parts are wrapped by heat insulating materials.
Further, the air dryer is arranged on the second gas pipeline.
Further, the number of the constant-pressure air storage tanks is at least 1, and the sum of the horizontal cross-sectional areas of all the constant-pressure air storage tanks at any position is equal to the horizontal cross-sectional area of the water surface floating platform at any position. By the arrangement, constant pressure gas storage and release can be ensured, and the service life is long.
Further, the device also comprises an air pressure sensor, wherein the air pressure sensor is used for measuring the internal air pressure of the constant-pressure air storage tank.
The invention also provides a buoyancy feedback type hydraulic constant pressure energy storage and release method, which comprises the following steps:
in the initial state, partial gas is reserved in the constant-pressure gas storage tank, and the overall average density of the constant-pressure gas storage tank is smaller than that of water; the water surface floating platform is suspended in water, and the cable is stretched under the buoyancy action of the water surface floating platform and the constant-pressure air storage tank; the motor adjusts the length of the cable to control the depth of the constant pressure air storage tank so as to set the working pressure p w＝p0+ρghw of the system, wherein p w is the air pressure (Pa) in the constant pressure air storage tank; p 0 is atmospheric pressure (Pa); ρ is the density of water (kg/m 3); g is the gravity acceleration (m/s 2);hw is the vertical distance (m) from the liquid level to the water level in the constant-pressure air storage tank;
When the motor-generator is in a low electricity consumption period, the motor-generator is set to be in a motor state, surplus electric energy of a power grid is used for driving the motor-generator, the motor-generator is connected with the multi-stage air compressor, the motor-generator is disconnected from the multi-stage air turbine, a three-way valve is connected with a valve at the end of the multi-stage air compressor and is opened, a valve connected with a multi-stage air ventilation end is closed, and an air inlet and outlet electric gate and an air outlet electric gate are opened;
The multi-stage compressor starts working under the drive of the motor-generator, the cold storage medium heat preservation tank and the heat storage medium heat preservation tank start to work circularly respectively, the interstage gas of the multi-stage compressor is cooled, the high-pressure gas at the outlet of the multi-stage compressor enters the constant-pressure gas storage tank through the third gas transmission pipeline to finish the gas storage process, the motor-generator and the multi-stage compressor are disconnected, the three-way valve, the gas inlet and outlet electric gate and the water inlet and outlet electric gate are closed, the cold storage medium heat preservation tank and the heat storage medium heat preservation tank stop to work circularly, and the cold storage medium which consumes cold energy and the heat storage medium which recovers heat energy are stored respectively;
When the power consumption peak period is entered, the motor-generator is set to be in a generator state, the air inlet and outlet electric gate and the water inlet and outlet electric gate are opened, the valve of the three-way valve connected with the multistage air ventilation end is opened, the valve connected with the multistage air compressor (1) end is closed, and the motor-generator is communicated with the multistage air turbine;
The high-pressure gas in the constant-pressure gas storage tank passes through a third gas transmission pipeline, water vapor is removed by an air dryer, then the high-pressure gas enters a multi-stage air turbine, expansion work is performed in the air turbine, the cold storage medium heat preservation tank and the heat storage medium heat preservation tank respectively start to circularly work, the interstage gas of the multi-stage air turbine is heated, the multi-stage air turbine drives a generator to generate electricity, and electric energy is transmitted to a power grid;
After the gas release process is finished, the motor-generator is disconnected from the multi-stage air turbine, the three-way valve, the gas inlet and outlet electric gate and the water inlet and outlet electric gate are closed, the heat storage medium heat preservation tank and the cold storage medium heat preservation tank stop working circularly, and the cold storage medium stored with cold energy and the heat storage medium consumed with heat energy are stored respectively;
During the gas storage and release processes, h w keeps a constant value due to the buoyancy feedback effect of the water surface floating platform, namely the working pressure p w＝p0+ρghw of the system in the constant-pressure gas storage tank is a constant value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. Compared with a water pumping energy storage system, the buoyancy feedback type hydraulic constant-pressure energy storage and release system has the advantages of short construction period, loose site selection requirement and low initial investment cost; compared with a storage battery energy storage system, the buoyancy feedback type hydraulic constant-pressure energy storage and release system has long service life, little pollution and high power level.
2. Compared with a constant-volume energy storage system, when the buoyancy feedback type hydraulic constant-pressure energy storage and release system stores and releases energy, the air pressure is constant, and the turbine and the air compressor work under the design working condition, so that the system efficiency is high.
3. Compared with a motor-cable type underwater constant-pressure energy storage and release system, the buoyancy feedback type hydraulic constant-pressure energy storage and release system realizes constant-pressure energy storage and release by utilizing the buoyancy negative feedback function of the water surface floating platform, and an automatic control system is not required to be additionally designed to control constant pressure. In addition, the buoyancy feedback type hydraulic constant-pressure energy storage and release system does not need to additionally input energy in the process of controlling constant-pressure energy storage and release by utilizing the buoyancy negative feedback function of the water surface floating platform.
4. The buoyancy feedback type hydraulic constant pressure energy storage and release system reasonably utilizes the heat energy of the air compressor outlet and the cold energy of the air turbine outlet, so that the air compressor and the turbine work near isentropic, and the system efficiency is improved.
5. The buoyancy feedback type hydraulic constant-pressure energy storage and release system can adjust the depth of the constant-pressure air storage tank by dragging a cable through a motor, so that different working pressures can be set for the system.
6. In recent years, new energy power generation rapidly develops, and the large-scale popularization and application of related energy storage technologies are imperative. For offshore wind power, the subsea compressed air energy storage may utilize a seawater environment in situ. The buoyancy feedback type hydraulic constant-pressure energy storage and release system can provide an effective technical means for promoting the flexible and efficient absorption of new energy.
Drawings
FIG. 1 is a schematic diagram of a buoyancy feedback hydraulic constant pressure energy storage and release system according to an embodiment of the invention.
FIG. 2 is a diagram of the process of adjusting the system operating pressure as the sea level height changes.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Specifically, referring to fig. 1, the present embodiment provides a buoyancy feedback hydraulic constant pressure energy storage and release system, which includes a water surface floating platform 6, a multi-stage compressor 1, a motor-generator 3, a multi-stage air turbine 4, a first clutch 2, a second clutch, a three-way valve 5, a constant pressure air storage tank 10, a cold storage medium heat preservation tank 18, a heat storage medium heat preservation tank 19, a first heat exchange pipeline, a second heat exchange pipeline, an underwater fixed platform 13, a motor 15, an air dryer 16 and an air pressure sensor 17.
The water surface floating platform 6 is arranged close to the water surface and is suspended in the water, the water surface floating platform 6 is parallel to the water surface, the position of the water surface floating platform 6 in the water along the vertical direction is adjustable, the multistage compressor 1, the motor-generator 3 and the multistage air turbine 4 are positioned above the water surface floating platform 6, the multistage compressor 1 and the multistage air turbine 4 are respectively connected with the motor-generator 3 through wires, an outlet of the multistage compressor 1 and an inlet of the multistage air turbine 4 are respectively connected with a first port and a second port of the three-way valve 5 through a first gas transmission pipeline and a second gas transmission pipeline, the constant-pressure gas storage tank 10 is positioned below the water surface and is adjustable in distance relative to the water surface, the constant-pressure gas storage tank 10 is parallel to the water surface floating platform 6, the constant-pressure gas storage tank 10 comprises a water inlet and a water outlet arranged at the bottom and a water outlet arranged at the top, the water inlet and the water outlet is connected with a third port of the three-way valve 5 through a third gas transmission pipeline 8, and the distance between the liquid level in the constant-pressure gas storage tank 10 and the water surface is constant when energy is stored and released.
The motor-generator 3 integrated machine can switch the working modes according to the energy storage or energy release process: when energy is stored, the working mode is a motor, and when energy is released, the working mode is a generator.
In the present embodiment, a first clutch 2 is provided on a wire between the multistage compressor 1 and the motor-generator 3 to control the switching on or off of a line between the multistage compressor 1 and the motor-generator 3, and a second clutch is provided on a wire between the motor-generator 3 and the multistage air turbine 4 to control the switching on or off of a line between the motor-generator 3 and the multistage air turbine 4. The first clutch and the second clutch are arranged, so that the energy storage process and the energy release process can be conveniently converted.
In this embodiment, the cold storage medium heat-preserving tank 18 is fixed on the water surface floating platform 6, the cold storage medium heat-preserving tank 18 is used for storing cold storage medium, such as any one of SH-non-deicing, ice, dry ice, etc., and the cold storage medium heat-preserving tank 18 includes a cold storage outlet and a cold storage inlet, one end of the first heat exchange pipeline is communicated with the cold storage outlet, the other end of the first heat exchange pipeline sequentially passes through the vicinity of each stage of the multistage compressor 1 and the vicinity of the outlet of the multistage air turbine 4 and then is communicated with the cold storage inlet, when the multistage compressor 1 works, high-temperature exhaust gas between stages of the compressor exchanges heat with the cold storage medium in the first heat exchange pipeline, and the temperature of the interstage gas is reduced, so that the multistage compressor 1 works near isentropic, and the efficiency of the multistage compressor 1 is improved; the air near the outlet of the multi-stage compressor 1 exchanges heat with the heat storage medium in the second heat exchange pipe, thereby storing the heat energy of the high-temperature air near the outlet of the multi-stage compressor 1 in the heat storage medium.
The heat storage medium heat preservation tank 19 is fixed on the water surface floating platform 6, the heat storage medium such as mineral oil, heat conducting oil and molten salt is stored in the heat storage medium heat preservation tank 19, the heat storage medium heat preservation tank 19 comprises a heat storage outlet and a heat storage inlet, one end of the second heat exchange pipeline is communicated with the heat storage outlet, and the other end of the second heat exchange pipeline sequentially passes through the vicinity of each stage of the multistage air turbine 4 and the vicinity of the outlet of the multistage air compressor 1 and then is communicated with the heat storage inlet. When the multi-stage air turbine 4 works, heat exchange is carried out between low-temperature exhaust gas between turbine stages and a heat storage medium in the second heat exchange pipeline, and the temperature of the gas between the stages is raised, so that the multi-stage air turbine 4 works near isentropic, and the efficiency of the multi-stage air turbine 4 is improved; the air near the outlet of the multi-stage air turbine 4 is heat-exchanged with the cold storage medium in the first heat exchange pipe, so that the cold energy of the low-temperature air near the outlet of the multi-stage air turbine 4 is stored in the cold storage medium.
In this embodiment, the first heat exchange pipeline and the second heat exchange pipeline are located between each stage of the multi-stage compressor 1, the outlet of the multi-stage air turbine 4, each stage of the multi-stage air turbine 4, and the part near the outlet of the multi-stage compressor 1 are made of heat conducting materials, so that the heat conducting efficiency is enhanced, and the rest parts are wrapped by heat insulating materials, so that the energy consumption is reduced.
In this embodiment, the water inlet and outlet gate 11 is disposed at the water inlet and outlet of the constant-pressure air storage tank 10, the air inlet and outlet gate 9 is disposed at the air inlet and outlet of the constant-pressure air storage tank 10, the air inlet and outlet gate 9 is connected with one end of the third air pipeline 8, and the other end of the third air pipeline 8 is connected with the third port of the three-way valve 5.
The air pressure sensor 17 is provided at the inner side of the top of the constant pressure air tank 10 to measure the internal air pressure of the constant pressure air tank 10. As shown in fig. 2, when the air pressure sensor 17 measures that the air pressure in the constant pressure air tank 10 is large, the motor 15 is operated to extend the cable length, and the constant pressure air tank 10 is thereby raised; when the air pressure sensor 17 measures that the air pressure in the constant pressure air tank 10 is small, the motor 15 is operated to shorten the cable length, and the constant pressure air tank 10 is lowered accordingly. And simultaneously, the air pressure is used as signal feedback to carry out feedback adjustment.
In this embodiment, the number of the constant pressure air tanks 10 is 1, however, in other embodiments, the constant pressure air tanks 10 may be arranged in other numbers, but it is required that the sum of the horizontal cross-sectional areas of any part of the outer walls of all the constant pressure air tanks 10 is equal to the horizontal cross-sectional area of any part of the outer walls of the water surface floating platform 6. By the arrangement, constant-pressure gas storage and release can be realized for a long time, and an automatic constant-pressure control system is not required to be additionally designed.
In this embodiment, the constant pressure air storage tank is a columnar cylinder with a side surface perpendicular to the bottom surface of the platform.
The present embodiment further comprises an air dryer 16, the air dryer 17 being arranged on the second gas line. When energy is released, the high-pressure gas from the constant-pressure gas storage tank is dried in the air dryer, and the water vapor is removed and then enters the multi-stage air turbine 4, so that the water vapor is prevented from entering the multi-stage air turbine 4 to influence the working efficiency.
The water surface floating platform comprises a water surface floating platform, a constant pressure air storage tank, a water surface floating platform and a constant pressure air storage tank, wherein the water surface floating platform is arranged on the water surface, the constant pressure air storage tank is connected with the water surface floating platform in a sliding mode, the water surface floating platform is connected with the constant pressure air storage tank in a sliding mode, the constant pressure air storage tank is connected with the water surface floating platform in a sliding mode, the water surface floating platform is connected with the constant pressure air storage. The side wall of the constant-pressure air storage tank 10 is provided with a pulley, and the constant-pressure air storage tank 10 can slide up and down along a vertical guide rail through the pulley. The vertical guide rails in this embodiment are provided with four, and are symmetrically disposed on both sides of the constant pressure air tank 10, respectively. Of course, in other embodiments, the number of vertical rails is other numbers, such as 2. By providing vertical guide rails, the vertical guide rails play a guiding role when the positions of the horizontal floating platform 6 and the constant pressure air storage tank 10 are adjusted.
In this embodiment, the water surface floating platform 6 includes a horizontal installation platform and an installation platform located at the side of the horizontal installation platform and higher than the horizontal installation platform, the installation platform is perpendicular to the horizontal installation platform, and the installation platform is higher than the constant pressure air storage tank in height, and the cold storage medium heat preservation tank 18 and the heat storage medium heat preservation tank 18 are both installed on the horizontal installation platform. The underwater fixed platform is characterized by further comprising a motor 15, a cable 12, an underwater fixed platform 13, a first fixed pulley 14 and a second fixed pulley 20, wherein the motor 15 is used for controlling the winding and unwinding of the cable 12, the motor 15 is fixedly arranged on a horizontal installation platform, the first fixed pulley 14 is fixedly arranged on the top of the installation platform of the water surface floating platform 6, the underwater fixed platform 13 is positioned below the constant-pressure air storage tank 10 in parallel, the second fixed pulley 20 is fixedly arranged on the underwater fixed platform 13, the second fixed pulley 20 and the first fixed pulley 14 are positioned on the same vertical line, one end of the cable 12 is connected with the motor 15, the other end of the cable 12 is fixedly connected with the bottom of the constant-pressure air storage tank 10 after being sequentially wound around the first fixed pulley 14 and the second fixed pulley 20, and the length direction of the cable 12 is parallel to a vertical guide rail and vertical to the water surface floating platform 6. In this embodiment, two motors 15, two cables 12, two first fixed pulleys 14 and two second fixed pulleys 20 are respectively provided, the two motors 15 are symmetrically disposed about the constant pressure air tank 10, and the two cables 12, two first fixed pulleys 14 and two second fixed pulleys 20 are also symmetrically disposed about the constant pressure air tank 10. The motor 15 works to shorten or lengthen the length of the cable, so that the distance between the constant-pressure air storage tank and the water surface can be adjusted, namely the depth of the constant-pressure air storage tank can be adjusted, and the working pressure of the system can be set.
The embodiment also provides a buoyancy feedback type hydraulic constant pressure energy storage and release method, which comprises the following steps:
(1) Assuming an initial state, part of the gas is reserved in the constant-pressure gas storage tank 10, and the overall average density of the constant-pressure gas storage tank 10 is smaller than that of water; the water surface floating platform 6 is suspended in water, and the cable 12 is stretched under the buoyancy action of the water surface floating platform 6 and the constant pressure air storage tank 10; the motor 15 adjusts the length of the cable 12 to control the depth of the constant pressure reservoir 10 to set the system operating pressure p w＝p0+ρghw. Wherein, p w is the gas pressure in the constant pressure gas storage tank 10, pa; p 0 is atmospheric pressure, pa; ρ is the density of water, kg/m 3; g is the gravity acceleration, m/s 2;hw is the vertical distance from the liquid level to the water level in the constant-pressure air storage tank 10, and m;
(2) The motor-generator 3 is set to be in a motor state when the electricity consumption is in a valley period, the motor 3 is driven by surplus electric energy of a power grid, at the moment, the first clutch 2 is connected with the multi-stage air compressor 1, the second clutch is disconnected with the multi-stage air turbine 4, a valve at the end of the three-way valve 5 connected with the multi-stage air compressor 1 is opened so that a first air transmission pipeline is communicated with the multi-stage air compressor 1 and a third air transmission pipeline 8, the valve at the end of the multi-stage air turbine 4 is closed, and the air inlet and outlet electric gate 9 and the water inlet and outlet electric gate 11 are opened;
(3) The multistage compressor 1 starts to work under the drive of the motor-generator 3, the cold storage medium heat preservation tank 18 and the heat storage medium heat preservation tank 19 start to work circularly respectively, high-pressure gas at the outlet of the multistage compressor 1 enters the constant-pressure gas storage tank 10 through the gas transmission pipeline 8 and water in the constant-pressure gas storage tank 10 is discharged through the water inlet and outlet;
(4) After the gas storage process is finished, the first clutch 2 at the end of the multistage compressor 1 is disconnected, the three-way valve 5 is closed, the gas inlet and outlet electric gate 9 and the water inlet and outlet electric gate 11 are closed, the cold storage medium heat preservation tank 18 and the heat storage medium heat preservation tank 19 stop circulating work, and the cold storage medium which consumes cold energy and the heat storage medium which recovers heat energy are respectively stored;
(5) The motor-generator 3 is set to be in a generator state when the power consumption peak period is entered, the air inlet and outlet electric gate 9 and the water inlet and outlet electric gate 11 are opened, the valve of the three-way valve 5 connected with the end of the multi-stage air turbine 4 is opened, the valve connected with the end of the multi-stage air compressor 1 is closed, the second clutch at the end of the multi-stage air turbine 4 is connected, and the first clutch 2 is disconnected;
(6) The high-pressure gas in the constant-pressure gas storage tank 10 passes through a gas transmission pipeline 8, water vapor is removed by an air dryer 16, then the gas enters a multi-stage air turbine 4, the gas expands in the air turbine 4 to do work, a cold storage medium heat preservation tank 18 and a heat storage medium heat preservation tank 19 respectively start to circularly work, and the multi-stage air turbine 4 drives a generator 3 to generate electricity and transmits electric energy to a power grid;
(7) After the gas release process is finished, the second clutch at the end of the multi-stage air turbine 4 is disconnected, the three-way valve 5 is closed, the gas inlet and outlet electric gate 9 and the water inlet and outlet electric gate 11 are closed, the heat storage medium heat preservation tank 19 and the cold storage medium heat preservation tank 18 stop circulating work, and the cold storage medium which stores cold energy and the heat storage medium which consumes heat energy are respectively stored;
(8) During the gas storage and release process, h w is kept at a constant value due to the buoyancy feedback action of the water surface floating platform 6, namely the working pressure p w＝p0+ρghw of the system in the constant-pressure gas storage tank 10 is a constant value.
Intuitively, when gas is stored, the downward moving distance of the liquid level in the tank is consistent with the upward moving distance of the gas storage tank when the gas enters the constant-pressure gas storage tank 10, so that the absolute height of the liquid level in the tank is kept constant, and the water surface floating platform 6 descends; when the gas is released, the distance of the upward movement of the liquid level in the tank is equal to the distance of the downward movement of the constant-pressure gas storage tank when the gas leaves the constant-pressure gas storage tank 10, so that the absolute height of the liquid level in the tank is kept constant, and the water surface floating platform 6 ascends. The liquid level depth h w in the constant-pressure gas storage tank 10 is constant regardless of the gas storage process or the gas release process; the theoretical demonstration process is as follows:
At the time t, partial gas is filled in the constant-pressure gas storage tank 10, the overall average density of the constant-pressure gas storage tank 10 is smaller than that of water, and three forces are balanced under the action of the overall gravity, buoyancy and cable tension; the whole mass m and kg of the constant-pressure air storage tank at the moment of 10 t; the sum of the horizontal cross-sectional areas of any part of the constant-pressure air storage tank 10 and the cross-sectional area A, m 3 of any part of the water surface floating platform 6; the height h, m of the stored gas in the constant pressure gas storage tank 10; the resultant forces F, N acting on the cable 12 of the constant pressure air storage tank 10 are:
ρghA＝mg+F
Let t+dt be, the air storage is dv=adh, m 3; the inner bottom area A, m 2 of the constant-pressure air storage tank 10 increases the distance between the liquid level in the constant-pressure air storage tank 10 and the top of the constant-pressure air storage tank 10 by dh, m; the water surface floating platform 6 descends by dx and m under the action of the tension of the cable; if the gravity of the gas is not considered, the following are:
ρgA(h+dh)＝mg+F+ρgAdx
From the above equation, dh=dx, the water surface floating platform 6 descends by dx, that is, the position of the constant pressure gas tank 10 ascends by dx, and the distance dh from the liquid surface in the constant pressure gas tank 10 to the top of the constant pressure gas tank 10 is equal to the ascending distance dx of the constant pressure gas tank 10, that is, the absolute depth of the liquid surface in the constant pressure gas tank 10 is a constant value h w, so the gas pressure in the constant pressure gas tank 10 is also a constant value: p w＝p0+ρghw;
The above proving process proves that: in the process of gas storage and release, under the condition that the overall average density of the constant-pressure gas storage tank 10 is smaller than that of water, the cable 12 works in a tightening state, and the gas pressure p w in the constant-pressure gas storage tank 10 is kept constant, so that the buoyancy of the water surface floating platform 6 provides a mechanical feedback effect for the system, and the constant pressure of the system is ensured.
The compressed air energy storage and release system of the present embodiment is applied to specific items as follows.
The new energy power generation project at sea comprises wind power generation and solar power generation. In order to enhance the renewable energy consumption, the electricity consumption requirement is met when the electricity consumption peak expires, the waste wind and the waste light are reduced in the electricity consumption valley period, and the project is provided with a proper buoyancy feedback type hydraulic constant-pressure energy storage and release system. The working depth of the system and the size of the air storage tank are designed by the required energy storage energy. The design conditions of the multi-stage compressor and the multi-stage air turbine should correspond to the working depth of the system. The metal components of the energy storage system under the sea are all made of corrosion-resistant alloy, and are simultaneously matched with a cathode protection method of a sacrificial anode for corrosion resistance.
Initially the system operating pressure has been set by the motor to the cable length and the surface floating platform has been adjusted to near sea level. And when the generated energy is larger than the required amount, starting to store energy. The surplus electric energy on the side of the new energy adopts a bi-directional adjustable double PWM frequency conversion technology to adjust the frequency and the voltage and then drives a motor-generator (the working mode is a motor at the moment), the motor-generator drives a multi-stage compressor to press high-pressure gas into a constant-pressure gas storage tank, seawater in the constant-pressure gas storage tank is discharged through a water inlet and outlet sluice gate at the bottom, and the buoyancy negative feedback effect of a water surface floating platform ensures constant-pressure gas storage. In the gas storage process, the temperature of the multi-stage compressor stages is reduced by adopting a cold storage medium, so that the multi-stage compressor is close to isentropic operation, and the heat energy at the outlet of the multi-stage compressor is stored in the heat storage oil.
And when the generated energy is smaller than the required amount, starting to release energy. The high-pressure gas in the gas storage tank enters a multi-stage air turbine to expand and do work, and the multi-stage air turbine drives a motor-generator (the working mode is a generator at the moment) to generate power. The electric energy generated by the generator is input into a power grid after frequency modulation and voltage regulation by adopting a bidirectional adjustable double PWM frequency conversion technology. In the process of releasing gas, the mechanical negative feedback effect of the water surface floating platform ensures constant pressure gas release, the temperature between the multi-stage air turbine stages is raised by adopting a heat storage medium, so that the multi-stage air turbine is close to isentropic operation, and cold energy at the outlet of the multi-stage air turbine is stored in the cold storage medium. To improve the economic benefits of the project, project designers also use the cold energy in the cold storage medium for offshore fishery preservation.
If the tide occurs at a certain moment to cause the sea level to change, the project operator adjusts the working pressure of the energy storage system through the length of the motor adjusting cable, so that the working pressure is restored to the set value before the tide. As shown in fig. 2.
The above description is only of the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A buoyancy feedback type hydraulic constant-pressure energy storage and release system is characterized by comprising a water surface floating platform (6), a multi-stage air compressor (1), a motor-generator (3), a multi-stage air turbine (4), a three-way valve (5) and a constant-pressure air storage tank (10),
The water surface floating platform (6) is arranged close to the water surface and is suspended in the water, the position of the water surface floating platform in the vertical direction is adjustable, the water surface floating platform (6) comprises a horizontal installation table and an installation height table which is positioned at the side of the horizontal installation table and is higher than the horizontal installation table, the installation height table is vertical to the horizontal installation table, the installation height table is higher than the height of the constant-pressure air storage tank,
The multistage compressor (1), the motor-generator (3) and the multistage air turbine (4) are positioned above the water surface floating platform (6), the multistage compressor (1) and the multistage air turbine (4) are respectively connected with the motor-generator (3) through wires, the outlet of the multistage compressor (1) and the inlet of the multistage air turbine (4) are respectively connected with the first port and the second port of the three-way valve (5) through a first gas transmission pipeline and a second gas transmission pipeline,
The constant-pressure air storage tank (10) is positioned below the water surface and the distance between the constant-pressure air storage tank and the water surface is adjustable, the constant-pressure air storage tank (10) comprises a water inlet and a water outlet, the water inlet and the water outlet are connected with a third port of the three-way valve (5) through a third air conveying pipeline (8),
When gas is stored and released, the distance from the liquid level in the constant-pressure gas storage tank (10) to the water surface is constant;
also comprises a cold storage medium heat preservation tank (18), a heat storage medium heat preservation tank (19), a first heat exchange pipeline and a second heat exchange pipeline,
The heat preservation tank (18) of the storage Leng Jiezhi is fixed on the water surface floating platform (6), the heat preservation tank (18) of the storage Leng Jiezhi is used for storing cold medium, the heat preservation tank (18) of the storage Leng Jiezhi comprises a cold storage outlet and a cold storage inlet, one end of the first heat exchange pipeline is communicated with the cold storage outlet, the other end of the first heat exchange pipeline sequentially passes through the vicinity of each stage of the multistage compressor (1) and the vicinity of the outlet of the multistage air turbine (4) and then is communicated with the cold storage inlet,
The heat storage medium heat preservation tank (19) is fixed on the water surface floating platform (6), the heat storage medium is stored in the heat storage medium heat preservation tank (19), the heat storage medium heat preservation tank (19) comprises a heat storage outlet and a heat storage inlet, one end of the second heat exchange pipeline is communicated with the heat storage outlet, and the other end of the second heat exchange pipeline sequentially passes through the vicinity of each stage of the multi-stage air turbine (4) and the vicinity of the outlet of the multi-stage air compressor (1) and then is communicated with the heat storage inlet.
2. The buoyancy feedback type hydraulic constant pressure energy storage and release system according to claim 1, further comprising a motor (15), a cable (12), an underwater fixed platform (13), a first fixed pulley (14) and a second fixed pulley (20), wherein the motor (15) is used for controlling the retraction and release of the cable (12), the motor (15) and the first fixed pulley (14) are fixedly arranged on the water surface floating platform (6), the underwater fixed platform (13) is positioned below the constant pressure air storage tank (10), the second fixed pulley (20) is fixedly arranged on the underwater fixed platform (13), one end of the cable (12) is connected with the motor (15), and the other end of the cable is fixedly connected with the constant pressure air storage tank (10) after being sequentially wound around the first fixed pulley (14) and the second fixed pulley (20).
3. The buoyancy feedback type hydraulic constant pressure energy storage and release system according to claim 2, further comprising a vertical guide rail (7), wherein the bottom of the vertical guide rail (7) is fixedly connected with the underwater fixed platform (13), and the water surface floating platform (6) and the constant pressure air storage tank (10) are respectively in sliding connection with the vertical guide rail (7).
4. A buoyancy feedback hydraulic constant pressure energy storage and release system according to claim 3, characterized in that the number of cables (12), motors (15), vertical guide rails (7) is at least 2 and symmetrically arranged about the constant pressure air reservoir (10).
5. The buoyancy feedback type hydraulic constant pressure energy storage and release system according to claim 1, wherein a water inlet and outlet water electrolytic gate (11) is arranged at the water inlet and outlet of the constant pressure air storage tank (10), a gas inlet and outlet electric gate (9) is arranged at the gas inlet and outlet of the constant pressure air storage tank (10), the gas inlet and outlet electric gate (9) is connected with one end of a third gas transmission pipeline (8), and the other end of the third gas transmission pipeline (8) is connected with the third port of the three-way valve (5).
6. The buoyancy feedback type hydraulic constant pressure energy storage and release system according to claim 1, wherein,
The parts of the first heat exchange pipeline and the second heat exchange pipeline, which are positioned among the stages of the multistage compressor (1), the outlet of the multistage air turbine (4), the stages of the multistage air turbine (4) and the vicinity of the outlet of the multistage compressor (1), are made of heat conducting materials, and the rest parts are wrapped by heat insulating materials.
7. The buoyancy feedback hydraulic constant pressure energy storage and release system according to claim 1, further comprising an air dryer (16), wherein the air dryer (16) is disposed on the second gas line.
8. The buoyancy feedback type hydraulic constant pressure energy storage and release system according to claim 1, wherein the number of the constant pressure air tanks (10) is at least 1, the constant pressure air tanks (10) are columnar air cylinders with the side faces perpendicular to the bottom face, and the sum of the horizontal cross section areas of all the constant pressure air tanks (10) at any position is equal to the horizontal cross section area of the water surface floating platform (6) at any position.
9. A buoyancy feedback type hydraulic constant pressure energy storage and release method, characterized in that the energy storage and release system as claimed in any one of claims 1-8 is adopted, comprising the following steps:
Assuming an initial state, a part of gas remains in the constant-pressure gas storage tank (10), and the overall average density of the constant-pressure gas storage tank (10) is smaller than that of water; the water surface floating platform (6) is suspended in water, and the cable (12) is stretched under the buoyancy action of the water surface floating platform (6) and the constant pressure air storage tank (10); the motor (15) adjusts the length of the cable (12) to control the depth of the constant pressure gas storage tank (10) so as to set the working pressure p w= p0+ρghw of the system, wherein p w is the gas pressure Pa in the constant pressure gas storage tank (10); p 0 is the atmospheric pressure in Pa; ρ is the density of water in kg/m 3; g is the gravity acceleration, the unit is m/s 2;hw is the vertical distance from the liquid level to the water level in the constant-pressure air storage tank (10), and the unit is m;
When the motor-generator (3) is in a low electricity consumption period, the motor-generator (3) is driven by surplus electric energy of a power grid, the motor-generator (3) is connected with the multi-stage air compressor (1), the motor-generator (3) is disconnected from the multi-stage air turbine (4), a three-way valve (5) is connected with a valve at the end of the multi-stage air compressor (1) and is opened, a valve at the end of the multi-stage air turbine (4) is closed, and an air inlet and outlet electric gate (9) and an water inlet and outlet electric gate (11) are opened;
The multi-stage air compressor (1) starts to work under the drive of the motor-generator (3), the cold storage medium heat preservation tank (18) and the heat storage medium heat preservation tank (19) start to work circularly respectively, the inter-stage air of the multi-stage air compressor (1) is cooled, the high-pressure air at the outlet of the multi-stage air compressor (1) enters the constant-pressure air storage tank (10) through the third air transmission pipeline (8) and the water in the constant-pressure air storage tank (10) is discharged through the water inlet and outlet water electrolysis gate (11);
After the gas storage process is finished, the motor-generator (3) and the multi-stage gas compressor (1) are disconnected, the three-way valve (5), the gas inlet and outlet electric gate (9) and the water inlet and outlet electric gate (11) are closed, the cold storage medium heat preservation tank (18) and the heat storage medium heat preservation tank (19) stop circulating work, and the cold storage medium which consumes cold energy and the heat storage medium which recovers heat energy are respectively stored;
When the power consumption peak period is entered, the motor-generator (3) is set to be in a generator state, the air inlet and outlet motor gate (9) and the water inlet and outlet motor gate (11) are opened, the valve of the three-way valve (5) connected with the end of the multi-stage air turbine (4) is opened, the valve connected with the end of the multi-stage air compressor (1) is closed, and the motor-generator (3) is communicated with the multi-stage air turbine (4);
The high-pressure gas in the constant-pressure gas storage tank (10) passes through a third gas pipeline (8), water vapor is removed by an air dryer (16), then enters a multi-stage air turbine (4), expansion work is performed in the air turbine (4), a cold storage medium heat preservation tank (18) and a heat storage medium heat preservation tank (19) respectively start to circularly work, the temperature of the interstage gas of the multi-stage air turbine (4) is raised, the multi-stage air turbine (4) drives a generator (3) to generate electricity, and electric energy is transmitted to a power grid;
After the air release process is finished, the motor-generator (3) is disconnected from the multi-stage air turbine (4), the three-way valve (5), the air inlet and outlet electric gate (9) and the water inlet and outlet electric gate (11) are closed, the heat storage medium heat preservation tank (19) and the cold storage medium heat preservation tank (18) stop circulating work, and the cold storage medium which stores cold energy and the heat storage medium which consumes heat energy are respectively stored;
During the gas storage and release processes, h w keeps a constant value due to the buoyancy feedback effect of the water surface floating platform (6), namely the working pressure p w= p0+ρghw of the system in the constant-pressure gas storage tank (10) is a constant value.
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| CN111120208A (en) * | 2020-01-14 | 2020-05-08 | 华南理工大学 | Hydraulic constant-pressure energy storage and release system and intelligent regulation and control method |
| CN111396162A (en) * | 2020-04-20 | 2020-07-10 | 贵州电网有限责任公司 | High-efficiency advanced compressed air energy storage system and method |
| CN111577574A (en) * | 2020-05-30 | 2020-08-25 | 华南理工大学 | Spring type underwater constant-pressure air energy storage and release system |
| CN214464803U (en) * | 2020-09-04 | 2021-10-22 | 华南理工大学 | Buoyancy feedback type hydraulic constant-pressure energy storage and release system |
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| CN112128086A (en) | 2020-12-25 |
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