CN115773164A - Isothermal compressed air synergistic energy storage system and method - Google Patents
Isothermal compressed air synergistic energy storage system and method Download PDFInfo
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- CN115773164A CN115773164A CN202310103568.5A CN202310103568A CN115773164A CN 115773164 A CN115773164 A CN 115773164A CN 202310103568 A CN202310103568 A CN 202310103568A CN 115773164 A CN115773164 A CN 115773164A
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Abstract
The invention discloses an isothermal compressed air efficiency-increasing energy storage system which comprises a compression/expansion device, a motor generator, an energy storage device, a cooling tower, a heat collecting pipe array and a control device, wherein the compression device is a reciprocating multi-stage compression/expansion device, the motor generator works as a motor and a generator, the motor generator is connected with the compression device, the energy storage device comprises a gas storage device and a heat storage device, the gas storage device is connected with the compression/expansion device, the cooling tower exchanges heat with the compression/expansion device through a circulating water pipeline, the heat collecting pipe array is communicated with the heat storage device, and the control device is electrically connected with the compression/expansion device and the motor generator. The isothermal compressed air synergistic energy storage system provided by the invention has the advantages of high energy storage efficiency, full utilization of low-temperature heat resources and high electricity-electricity conversion efficiency.
Description
Technical Field
The invention relates to the technical field of energy storage of photovoltaic power stations, in particular to an isothermal compressed air synergistic energy storage system and method.
Background
At present, the maturity and large-scale application of a photovoltaic power generation technology enables the proportion of photovoltaic power generation in an energy system in China to be rapidly improved, but the intermittency and instability of photovoltaic power generation bring great challenges to the safe and stable operation and regulation capacity of a power grid, so that an energy storage system of a large-scale photovoltaic power station becomes necessary for large-scale photovoltaic application, and the photovoltaic power generation technology has very important significance. The site selection of the photovoltaic power station has excellent light resources, but most of the sites are remote in geographic locations, and an energy storage system which is simple in system, easy to operate and capable of fully utilizing the light resources is urgently needed.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides an isothermal compressed air synergistic energy storage system which has the advantages of high energy storage efficiency, full utilization of low-temperature heat resources and high electricity-electricity conversion efficiency.
According to the isothermal compressed air synergistic energy storage system provided by the embodiment of the invention, the isothermal compressed air synergistic energy storage system comprises a compression/expansion device, a motor generator, an energy storage device, a cooling tower, a heat collecting pipe array and a control device, wherein the compression device is a reciprocating multi-stage compression/expansion device, the motor generator works as a motor and a generator, the motor generator is connected with the compression device, the energy storage device comprises a gas storage device and a heat storage device, the gas storage device is connected with the compression/expansion device, the cooling tower exchanges heat with the compression/expansion device through a circulating water pipeline, the heat collecting pipe array is communicated with the heat storage device, and the control device is electrically connected with the compression/expansion device and the motor generator.
The isothermal compressed air synergistic energy storage system provided by the embodiment of the invention has the advantages of high energy storage efficiency, full utilization of low-temperature heat resources and high electricity-electricity conversion efficiency. This application utilizes to isothermal compressor/expander to compress air or other gases and stores, realizes the high-efficient compression of nearly isothermal and storage of air through cooling heat transfer to acquire the light and heat resource and save in hot water. When energy is released, hot water is utilized to heat air, and energy is released through expansion of compressed air in a synergistic mode, so that efficient electric energy storage and release are realized.
In some embodiments, the compression/expansion device comprises a plurality of reciprocating compression/expansion machines, each reciprocating compression/expansion machine comprises a crankshaft, a plurality of cylinders and a piston, the cylinders are connected with an air pipeline through valves, the air pipeline is connected with the air storage device, cylinder water jackets are arranged on the outer sides of the cylinder walls of the cylinders, and the cylinder water jackets are connected with the circulating water pipeline.
In some embodiments, the crank of the crankshaft is pivotally connected to a plurality of the pistons, the crankshaft drives the plurality of the pistons to reciprocate in the corresponding cylinders, and the crankshaft is in transmission connection with the motor generator.
In some embodiments, an indirect cooling buffer tank is arranged between the air cylinder and the adjacent air cylinder, the indirect cooling buffer tank comprises an air side and a water side, the air side is connected with the air pipeline, an inlet of the water side is connected with an outlet of the cooling tower through a circulating water pipeline, and an outlet of the water side is connected with an inlet of the cooling tower through a circulating water pipeline.
In some embodiments, the top of the cylinder is provided with an electrically controlled nozzle, and the electrically controlled nozzle is connected with an outlet of a high-pressure water pump through a high-pressure water spraying pipeline, and an inlet of the high-pressure water pump is connected with an outlet of the cooling tower.
In some embodiments, an inlet of the heat collecting tube array is connected to an outlet of the cooling tower through a circulating water pump, and an outlet of the heat collecting tube array is connected to an inlet of the heat storage device.
In some embodiments, the outlet of the heat storage device is connected to the inlet of a hot water pump, the outlet of the hot water pump is connected to an enhanced heater, and the enhanced heater is connected to the cooling tower.
In some embodiments, the synergistic heater has two flow spaces of a cold water side and a hot water side, a hot water side inlet of the synergistic heater is connected with an outlet of the hot water pump, a hot water side outlet of the synergistic heater is connected with the cooling tower, a cold water side outlet of the synergistic heater is connected with an inlet of the circulating water pump, an outlet of the cooling tower is communicated with a cold water side inlet of the synergistic heater through the circulating water pipeline, and an outlet of the circulating water pump is connected with an inlet of the water jacket of the cylinder through the circulating water pipeline.
In some embodiments, the outlet of the cylinder water jacket is connected with the inlet of the cooling tower through the circulating water pipeline, and the inlet of the cylinder water jacket is connected with the outlet of the circulating water pump through the circulating water pipeline.
According to the operation method of the isothermal compressed air synergistic energy storage system, disclosed by the embodiment of the invention, the operation method of the isothermal compressed air synergistic energy storage system comprises the following steps of: starting a water circulation system, starting a circulating water pump, a high-pressure water pump and a cooling tower, and forming water circulation between a cylinder water jacket and an indirect cooling buffer tank;
the energy storage compression is realized, the motor generator runs in a motor mode, and electric energy from a photovoltaic power station is converted into mechanical energy to drive a crankshaft of a compression device to rotate so as to drive a piston to compress air in multiple stages;
the control system controls air intake, compression and exhaust of the air cylinder and controls water addition to the air cylinder, the air-water mixture from the air cylinder is discharged out of the air cylinder and enters the indirect cooling buffer tank, the exhaust of the low-pressure stage air cylinder enters the indirect cooling buffer tank and enters the next stage air cylinder after cooling water heat exchange, and the exhaust of the last stage air cylinder enters the last stage indirect cooling buffer tank and then enters the air storage tank;
the energy releasing expansion, the motor generator runs in a generator mode, the hot water pump is started, hot water in the hot water storage tank is heated and circulated through the synergistic heater and flows back to the cooling tower, the water temperature of the circulating water pump and the high-pressure water pump rises, high-pressure air passes through the multistage cylinder from the air storage tank to complete multistage expansion, and the high-pressure air drives the crankshaft to rotate so as to drive the motor generator to generate electricity.
Drawings
Fig. 1 is a schematic structural diagram of an isothermal compressed air synergistic energy storage system according to an embodiment of the present invention.
Reference numerals: 1. a motor generator; 2. a crankshaft; 3. a cylinder; 4. a piston; 5. an intake valve; 6. an exhaust valve; 7. an air duct; 8. an electrically controlled nozzle; 9. a water circulating pump; 10. a high pressure water pump; 11. a cylinder water jacket; 12. a circulating water pipeline; 13. a high pressure water spray pipeline; 14. an indirect cooling buffer tank; 15. a heat collection tube array; 16. a hot water storage tank; 17. a hot water pump; 18. a boost heater; 19. a cooling tower; 20. a gas storage tank; 21. and a control device.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An energy storage system for isothermally compressing air or other gases is a very advantageous option, and an isothermally compressed energy storage system can make full use of low temperature thermal resources to improve the efficiency of the energy storage system. For the current technical development and demonstration, the isothermal compressed air system has extremely high efficiency of an energy storage circulation system, so that the isothermal compressed air system has very remarkable superiority and huge development potential for a large-scale clean energy power generation system such as a photovoltaic power station and the like.
According to an embodiment of the invention, as shown in fig. 1, the isothermal compressed air synergistic energy storage system comprises a compression/expansion device, a motor generator 1, an energy storage device, a cooling tower 19, a heat collecting pipe array 15 and a control device 21, wherein the compression device is a reciprocating multi-stage compression/expansion device, the motor generator 1 works as a motor and a generator, the motor generator 1 is connected with the compression device, the energy storage device comprises an air storage device and a heat storage device, the air storage device is connected with the compression/expansion device, the cooling tower 19 exchanges heat with the compression/expansion device through a circulating water pipe 12, the heat collecting pipe array 15 is communicated with the heat storage device, and the control device 21 is electrically connected with the compression/expansion device and the motor generator 1. The motor generator 1 is a device that can function as both a motor and a generator. The cooling tower 19 functions to exchange the cooling water to ambient temperature and provide a sufficient water source for the isothermal compressed air synergistic energy storage system. The air storage device comprises an air storage tank 20 for storing high-pressure compressed air, the air storage tank 20 is composed of a plurality of steel pressure containers or pressure-resistant steel pipes, and the air storage device can be replaced by pressure-bearing underground salt caverns or mines and the like. The control device 21 can adopt a single chip microcomputer or a PLC and the like, the control device 21 mainly controls the start, stop and operation process of the isothermal compressed air synergistic energy storage system, and the control device 21 controls air inlet, air exhaust and other time sequences of the compression/expansion device according to the operation state of the compression/expansion device.
The isothermal compressed air synergistic energy storage system provided by the embodiment of the invention has the advantages of high energy storage efficiency, full utilization of low-temperature heat resources and high electricity-electricity conversion efficiency. This application utilizes to isothermal type compressor/expander to compress storage to air or other gases, realizes the high-efficient compression of nearly isothermal and storage of air through the cooling heat transfer to acquire the light and heat resource and save in hot water. When energy is released, hot water is utilized to heat air, and energy is released through expansion of compressed air in a synergistic mode, so that efficient electric energy storage and release are realized.
In some embodiments, the compression/expansion device comprises a plurality of reciprocating compression/expansion machines, each reciprocating compression/expansion machine comprises a crankshaft 2, a plurality of cylinders 3 and a piston 4, the cylinders 3 are connected with an air pipeline 7 through valves, the air pipeline 7 is connected with an air storage device, a cylinder water jacket 11 is arranged on the outer side of the cylinder wall of each cylinder 3, and the cylinder water jacket 11 is connected with a circulating water pipeline 12.
Specifically, each compression stage of the reciprocating multi-stage compression/expansion device is composed of a plurality of identical cylinders 3 and pistons 4, the number of the cylinders 3 and the pistons 4 of the compression stages at different stages can be different, the strokes of the cylinders 3 of the compression stages at different stages are identical, and the higher the bore diameter of the compression stage is, the smaller the bore diameter of the compression stage at the higher pressure is, the consistent thrust of the piston 4 is maintained. The top of the cylinder 3, i.e. the end of the cylinder 3 far away from the crankshaft 2, is provided with a valve, which comprises two electromagnetic valves, which are respectively used as an intake valve 5 and an exhaust valve 6 in the processes of compression and expansion, and the intake valve 5 and the exhaust valve 6 are connected with an air pipeline 7. The inlet of the cylinder water jacket 11 is connected with the outlet of the circulating water pump 9 through a circulating water pipeline 12, and the outlet of the cylinder water jacket 11 returns to the cooling tower 19 through the circulating water pipeline 12.
In some embodiments, the crank of the crankshaft 2 is pivotally connected to a plurality of pistons 4, the crankshaft 2 drives the plurality of pistons 4 to reciprocate in the corresponding cylinders 3, and the crankshaft 2 is drivingly connected to the motor generator 1.
Specifically, each cylinder 3 is fixed, each piston 4 is hinged to a crank on the crankshaft 2, and when the crankshaft 2 rotates, reciprocating motion of each piston 4 can be generated, so that a compression (expansion) process is realized.
In some embodiments, an indirect cooling buffer tank 14 is arranged between the air cylinder 3 and the adjacent air cylinder 3, the indirect cooling buffer tank 14 comprises an air side and a water side, the air side is connected with the air pipeline 7, an inlet of the water side is connected with an outlet of the cooling tower 19 through a circulating water pipeline 12, and an outlet of the water side is connected with an inlet of the cooling tower 19 through the circulating water pipeline 12.
Specifically, intercooling buffer tanks 14 are arranged between the cylinders 3 of the adjacent compressors and between the last stage of compression stage and the gas storage tank 20 of the gas storage device, the intercooling buffer tanks 14 adopt gas-water heat exchangers, the gas-water heat exchangers are divided into gas sides, and the intercooling buffer tanks 14 are used for cooling the compressed gas of the previous stage to the ambient temperature or heating the expanded gas and reducing the pressure fluctuation of the exhaust gas and the intake gas of the adjacent compression stages.
In some embodiments, the electrically controlled nozzle 8 is arranged on the top of the cylinder 3, the electrically controlled nozzle 8 is connected with the outlet of the high-pressure water pump 10 through a high-pressure water spraying pipeline 13, and the inlet of the high-pressure water pump 10 is connected with the outlet of the cooling tower 19.
Specifically, one or more electrically controlled nozzles 8 may be provided, the electrically controlled nozzles 8 are connected to the high-pressure water spraying pipe 13, the control device 21 is electrically connected to the electrically controlled nozzles 8 and controls the electrically controlled nozzles 8 to spray high-pressure water into the cylinder 3 in an atomizing manner, the high-pressure water pump 10 supplies high-pressure water to the high-pressure water spraying pipe 13, and the water spraying pressure of the electrically controlled nozzles 8 needs to be higher than the highest working pressure of each compression stage. The high-pressure water pump 10 is generally a positive displacement pump such as a plunger pump.
In some embodiments, the inlet of the heat collecting tube array 15 is connected to the outlet of the cooling tower 19 through the circulating water pump 9, and the outlet of the heat collecting tube array 15 is connected to the inlet of the heat storage device.
Specifically, the heat collecting tube array 15 is a heat collector array formed by vacuum heat collecting tubes, cold water is provided by the heat collecting tube array 15 through the circulating water pump 9, the cold water flows into the hot water storage tank 16 of the heat storage device after being heated and stored, and the hot water storage tank 16 is a normal-pressure water storage container with a good heat preservation effect, can be generally made of glass fiber reinforced plastics or metal supports, and stores hot water with the temperature lower than 100 ℃.
In some embodiments, the outlet of the heat storage device is connected to the inlet of a hot water pump 17, the outlet of the hot water pump 17 is connected to an enhanced heater 18, and the enhanced heater 18 is connected to a cooling tower 19.
Specifically, the outlet of the hot water pump 17 is connected to the hot water side inlet of the booster heater 18, and the hot water side inlet of the booster heater 18 is connected to the cooling tower.
In some embodiments, the synergistic heater 18 has two flow spaces of a cold water side and a hot water side, an inlet of the hot water side of the synergistic heater 18 is connected with an outlet of the hot water pump 17, an outlet of the hot water side of the synergistic heater 18 is connected with the cooling tower 19, an outlet of the cold water side of the synergistic heater 18 is connected with an inlet of the circulating water pump 9, an outlet of the cooling tower 19 is communicated with an inlet of the cold water side of the synergistic heater 18 through the circulating water pipe 12, and an outlet of the circulating water pump 9 is connected with an inlet of the cylinder water jacket 11 through the circulating water pipe 12.
Specifically, the synergistic heater 18 is a water-water heat exchanger, and the synergistic heater 18 is divided into two flow spaces of a cold water side and a hot water side. The hot water pump 17 conveys the hot water from the hot water storage tank 16 to the synergistic heater 18, the cooling tower 19 conveys the cooling water to the synergistic heater 18 through the circulating water pipeline 12 to realize water-water heat exchange, the water after the heat exchange is finished is conveyed to the cylinder water jacket 11 through the circulating water pump 9, the synergistic heater 18 heats the circulating water and flows back to the cooling tower 19 to improve the water temperature pumped by the high-pressure water pump 10 and the circulating water pump 9.
In some embodiments, the outlet of the cylinder water jacket 11 is connected with the inlet of the cooling tower 19 through a circulating water pipeline 12, and the inlet of the cylinder water jacket 11 is connected with the outlet of the circulating water pump 9 through the circulating water pipeline 12.
Specifically, the cylinder water jacket 11 forms water circulation with the cooling tower 19 through the circulating water pipeline 12, and the circulating water pump 9 provides power for the water circulation.
According to the operation method of the isothermal compressed air synergistic energy storage system, the operation method of the isothermal compressed air synergistic energy storage system comprises the following steps:
starting a water circulation system, starting a circulating water pump 9, a high-pressure water pump 10 and a cooling tower 19, and forming water circulation between a cylinder water jacket 11 and an indirect cooling buffer tank 14; the preparation work is completed.
The method comprises the following steps of (1) energy storage compression, wherein a motor generator 1 runs in a motor mode, and converts electric energy from a photovoltaic power station into mechanical energy to drive a crankshaft 2 of a compression device to rotate so as to drive a piston 4 to carry out multistage compression on air; in the process of energy storage compression, the motor generator 1 is used as a motor to operate, redundant electric energy of a photovoltaic power station is used for driving the crankshaft 2 to rotate, and the piston 4 reciprocates to perform multi-stage compression on air.
The control system controls air intake, compression and exhaust of the air cylinder 3, controls water addition to the air cylinder 3, discharges an air-water mixture from the air cylinder 3 into the indirect cooling buffer tank 14, discharges exhaust gas of the low-pressure air cylinder 3 into the indirect cooling buffer tank 14, enters the next-stage air cylinder 3 after cooling water heat exchange, and enters the air storage tank 20 until the last-stage air cylinder 3 is discharged into the last-stage indirect cooling buffer tank 14; the control device 21 controls the electromagnetic valves to complete the steps of air intake, compression and exhaust of each air cylinder 3, the control device 21 controls the electric control nozzle 8 to spray water mist into the air cylinder 3, and the mixture of water and gas is discharged out of the air cylinder 3 and enters the indirect cooling buffer tank 14. The low-pressure stage exhaust gas enters the indirect cooling buffer tank 14, the gas which is compressed and heated under the heat exchange of cooling water is cooled to the ambient temperature, then enters the next stage for continuous compression until the gas is discharged from the last stage compressor, passes through the last stage cold buffer tank 14, and is finally stored in the gas storage tank 20. In the energy storage process, the heat collecting tube array 15 can be put into operation at the same time, cold water is provided by the circulating water pump 9, and the cold water flows into the hot water storage tank 16 to be stored after being heated by the heat collecting tube array 15.
The energy releasing expansion, the motor generator 1 operates in a generator mode, the hot water pump 17 is started, the hot water in the hot water storage tank 16 is heated and circulated through the synergistic heater 18 and flows back to the cooling tower 19, the water temperature of the circulating water pump 9 and the high-pressure water pump 10 is increased, the high-pressure air passes through the multistage cylinder 3 from the air storage tank 20 to complete multistage expansion, and the high-pressure air drives the crankshaft 2 to rotate so as to drive the motor generator 1 to generate electricity. The air in the expansion process in the air cylinder 3 is heated by the cooperation of the air cylinder water jacket 11, the indirect cooling buffer tank 14 and the electric control nozzle 8, the crankshaft 2 is driven to rotate through the expansion of the air, and the air is generated by the motor generator 1 and is sent to a power grid, so that the efficiency enhancement and energy release are realized. In some embodiments, the heat collecting tube array 15 with energy storage and release over-hanging is not operated, the system completes the energy storage and release process, and the system only works with near-isothermal expansion in the energy release process, thereby generating no synergistic benefit.
The technical advantages of the operation method of the isothermal compressed air synergistic energy storage system according to the embodiment of the invention are the same as those of the isothermal compressed air synergistic energy storage system, and are not described herein again. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention and that many changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. An isothermal compressed air synergistic energy storage system, comprising:
a compression/expansion device, the compression device being a reciprocating multi-stage compression/expansion device;
a motor generator that operates as a motor and a generator, the motor generator being connected to the compression device;
the energy storage device comprises an air storage device and a heat storage device, and the air storage device is connected with the compression/expansion device;
a cooling tower exchanging heat with the compression/expansion device through a circulating water pipe;
the heat collecting tube array is communicated with the heat storage device;
a control device electrically connected with the compression/expansion device and the motor generator.
2. The isothermal compressed air synergistic energy storage system according to claim 1, wherein the compression/expansion device comprises a plurality of reciprocating compressors/expanders, each reciprocating compressor/expander comprises a crankshaft, a plurality of cylinders and a piston, the cylinders are connected with an air pipeline through a valve, the air pipeline is connected with the air storage device, a cylinder water jacket is arranged on the outer side of the cylinder wall of each cylinder, and the cylinder water jacket is connected with the circulating water pipeline.
3. The isothermal compressed air synergistic energy storage system according to claim 2, wherein a crank of the crankshaft is pivotally connected to a plurality of the pistons, the crankshaft drives the plurality of the pistons to reciprocate in the corresponding cylinders, and the crankshaft is in transmission connection with the motor generator.
4. The isothermal compressed air synergistic energy storage system according to claim 2, wherein an intercooling buffer tank is arranged between each cylinder and the adjacent cylinder, the intercooling buffer tank comprises an air side and a water side, the air side is connected with the air pipeline, an inlet of the water side is connected with an outlet of the cooling tower through a circulating water pipeline, and an outlet of the water side is connected with an inlet of the cooling tower through a circulating water pipeline.
5. The isothermal compressed air synergistic energy storage system according to claim 2, wherein an electrically controlled nozzle is arranged at the top of the cylinder, the electrically controlled nozzle is connected with an outlet of a high-pressure water pump through a high-pressure water spraying pipeline, and an inlet of the high-pressure water pump is connected with an outlet of the cooling tower.
6. The isothermal compressed air synergistic energy storage system according to claim 2, wherein an inlet of the heat collecting tube array is connected with an outlet of the cooling tower through a circulating water pump, and an outlet of the heat collecting tube array is connected with an inlet of the heat storage device.
7. The isothermal compressed air synergistic energy storage system according to claim 6, wherein an outlet of the heat storage device is connected with an inlet of a hot water pump, an outlet of the hot water pump is connected with an synergistic heater, and the synergistic heater is connected with the cooling tower.
8. The isothermal compressed air synergistic energy storage system according to claim 7, wherein the synergistic heater has two flow spaces of a cold water side and a hot water side, a hot water side inlet of the synergistic heater is connected with an outlet of the hot water pump, a hot water side outlet of the synergistic heater is connected with the cooling tower, a cold water side outlet of the synergistic heater is connected with an inlet of the circulating water pump, an outlet of the cooling tower is communicated with a cold water side inlet of the synergistic heater through the circulating water pipeline, and an outlet of the circulating water pump is connected with an inlet of the cylinder water jacket through the circulating water pipeline.
9. The isothermal compressed air synergistic energy storage system according to claim 2, wherein the outlet of the cylinder water jacket is connected with the inlet of the cooling tower through the circulating water pipeline, and the inlet of the cylinder water jacket is connected with the outlet of the circulating water pump through the circulating water pipeline.
10. An operation method of an isothermal compressed air synergistic energy storage system is characterized by comprising the following steps:
starting a water circulation system, starting a circulating water pump, a high-pressure water pump and a cooling tower, and forming water circulation between a cylinder water jacket and an indirect cooling buffer tank;
the energy storage compression is carried out, the motor generator runs in a motor mode, and electric energy from a photovoltaic power station is converted into mechanical energy to drive a crankshaft of a compression device to rotate so as to drive a piston to carry out multi-stage compression on air;
the control system controls air intake, compression and exhaust of the air cylinder and controls water addition to the air cylinder, the air-water mixture from the air cylinder is discharged out of the air cylinder and enters the indirect cooling buffer tank, the exhaust of the low-pressure stage air cylinder enters the indirect cooling buffer tank and enters the next stage air cylinder after cooling water heat exchange, and the exhaust of the last stage air cylinder enters the last stage indirect cooling buffer tank and then enters the air storage tank;
the energy releasing expansion is performed, the motor generator operates in a generator mode, the hot water pump is started, hot water in the hot water storage tank is heated and circulated through the synergistic heater and flows back to the cooling tower, the water temperature of the circulating water pump and the high-pressure water pump rises, high-pressure air passes through the multistage cylinder from the air storage tank to complete multistage expansion, and the high-pressure air drives the crankshaft to rotate so as to drive the motor generator to generate electricity.
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