CN114151155A - Compressed air energy storage and supercritical carbon dioxide energy release coupling system - Google Patents

Compressed air energy storage and supercritical carbon dioxide energy release coupling system Download PDF

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CN114151155A
CN114151155A CN202111376122.7A CN202111376122A CN114151155A CN 114151155 A CN114151155 A CN 114151155A CN 202111376122 A CN202111376122 A CN 202111376122A CN 114151155 A CN114151155 A CN 114151155A
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heat
inlet
outlet
energy storage
coupling system
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徐望人
张成义
史进渊
赵峰
李振亚
张天博
祝自芳
王宇轩
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Shanghai Power Equipment Research Institute Co Ltd
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Shanghai Power Equipment Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • 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
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
    • 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
    • Y02E60/14—Thermal energy storage
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention relates to a compressed air energy storage and supercritical carbon dioxide energy release coupling system which comprises a compressed air energy storage sub-circulation system and a supercritical carbon dioxide energy release sub-circulation system. The compressed air energy storage sub-circulation system comprises a heat regeneration device, a compression device, a heat exchange device, a turbine and a heat storage assembly; the supercritical carbon dioxideThe carbon energy release sub-cycle system comprises CO2Turbine, CO2Regenerative assembly, CO2Cooling device, CO2Main compressor, CO2Bypass compression device, CO2Heat exchange device and heat-retaining subassembly. The coupling system can effectively realize demand side management, eliminate peak-valley difference between day and night and smooth load, can more effectively utilize power equipment, reduce power supply cost and promote application of renewable energy.

Description

Compressed air energy storage and supercritical carbon dioxide energy release coupling system
Technical Field
The invention belongs to the technical field of new energy power generation, and particularly relates to a compressed air energy storage and supercritical carbon dioxide energy release coupling system.
Background
The large-scale development of energy storage as an important technology and basic equipment for supporting a novel power system has become a necessary trend. The energy storage technology is regarded as an important component in six links of 'mining-generating-transporting-distributing-using-storing' in the operation process of a power grid. The energy storage system can realize the storage of large-capacity heat or energy, and stably releases the heat to be converted into electric energy or other utilization when the energy is needed, so that the defects of intermittence, volatility and the like of new energy power generation are overcome to a great extent by the application of the energy storage technology, and the development of new energy is powerfully promoted.
At present, the mature large-scale energy storage technologies mainly include pumped storage energy storage, compressed air energy storage, electromagnetic energy storage, chemical energy storage and the like, wherein the pumped storage energy storage technology is mature but is limited by geological conditions and needs sufficient water sources, and CN102758748B discloses a high-pressure liquid air energy storage/release system, which comprises an energy storage subsystem and an energy release subsystem, wherein the energy storage subsystem comprises a driving unit, the energy release subsystem comprises a self-pressurization unit and a power-doing unit, and the system does not consume power and electricity in the power generation stage and can recover medium-temperature and low-temperature waste heat, is suitable for various power stations, but needs a large-scale gas storage device and occupies a large area. In addition, electromagnetic energy storage and chemical energy storage have certain limitations in aspects of scale grade, technical level, economic cost and the like.
The development of novel clean energy is a key way for realizing sustainable development and solving the problem of energy shortage. Among them, the supercritical carbon dioxide power generation system is one of the hot research directions of new energy power generation. The supercritical carbon dioxide power generation system has the main mode that a heat absorption technology based on molten salt is combined with a supercritical carbon dioxide power circulation system, the supercritical carbon dioxide has large density and no phase change in a certain operating parameter range, the heat exchange performance is good, the heat exchange efficiency is improved, and the compressed supercritical carbon dioxide is used for storing energy, so that the scale of a storage system can be obviously reduced, and the cost is reduced.
Therefore, a new energy storage system needs to be developed, which is more economical and environmentally friendly, and can improve energy storage efficiency and reduce floor space.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a compressed air energy storage and supercritical carbon dioxide energy release coupling system, which can realize demand side management, has the capacity of peak clipping and valley filling, more effectively utilizes electrical equipment and reduces the power supply cost; meanwhile, a new idea is provided for the application of renewable energy sources.
In order to achieve the technical effect, the invention adopts the following technical scheme:
the invention provides a compressed air energy storage and supercritical carbon dioxide energy release coupling system, which comprises a compressed air energy storage sub-circulation system;
the compressed air energy storage sub-circulation system comprises a heat regeneration device, a compression device, a heat exchange device, a turbine and a heat storage assembly;
the supercritical carbon dioxide energy release sub-circulation system comprises CO2Turbine, CO2Regenerative assembly, CO2Cooling device, CO2Main compressor, CO2Bypass compression device, CO2Heat exchange device and heat-retaining subassembly.
In the invention, the compressed air energy storage is in an open cycle arrangement, high-pressure air is directly exhausted into the environment after acting in a turbine without a storage tank for storage, the economy of the cycle is improved, and the energy is stored in a heat energy form. Compared with the conventional steam circulation, the supercritical carbon dioxide energy release sub-circulation system has the advantages of small volume, light weight, small heat loss, high conversion efficiency and the like. The coupling system can improve the new energy consumption capability and the peak load and valley filling capability of a new energy intervening power grid, reduces the power supply cost, and has better environmental benefits.
As a preferable technical scheme of the invention, the circulating working medium of the compressed air energy storage sub-circulating system comprises air.
In the invention, the compressed air energy storage sub-circulation system adopts an open arrangement, and the inlet pressure and the outlet pressure of air are both atmospheric pressure.
As a preferable technical scheme of the invention, the circulating working medium of the supercritical carbon dioxide energy-releasing sub-circulating system comprises CO2。
As a preferable technical solution of the present invention, the heat storage assembly includes a first storage tank and a second storage tank.
Preferably, the heat storage medium of the first storage tank comprises a molten salt.
Preferably, the heat storage medium of the second storage tank comprises a molten salt.
As a preferred technical solution of the present invention, an outlet of the first storage tank is connected to a second inlet of the heat exchanging device.
Preferably, the second outlet of the heat exchange device is connected with the inlet of the second storage tank.
Preferably, an outlet of the second storage tank is in communication with the CO2And a second inlet of the heat exchange device is connected.
Preferably, the CO is2And a second outlet of the heat exchange device is connected with an inlet of the first storage tank.
In a preferred embodiment of the present invention, the turbine is coaxially connected to the compression device.
Preferably, the outlet of the compression device is connected to the first inlet of the heat exchange device.
Preferably, the first outlet of the heat exchanging device is connected with the second inlet of the heat regenerating device.
Preferably, the first outlet of the heat regenerator is connected to the inlet of the turbine.
Preferably, the second outlet of the heat regenerator is connected to the inlet of the compressor.
Preferably, the heat recovery device is provided with a gas inlet.
In the invention, the turbine is coaxially connected with the compression device so as to balance axial thrust and improve the structural compactness of the device; during a power valley, excess energy drives the rotation of the shaft by the motor.
As a preferred embodiment of the present invention, the CO is2The regenerative assembly includes a first CO2Regenerative device and secondary CO2A heat recovery device.
As a preferred embodiment of the present invention, the CO is2A first outlet of the heat exchange device and the CO2A flat inlet connection.
Preferably, the CO is2Outlet of turbine and said first CO2The first inlet of the heat regenerator is connected.
Preferably, the first CO2First outlet of heat regenerator and second CO2The first inlet of the heat regenerator is connected.
Preferably, the second CO2A first outlet of the heat regenerator and the CO2The inlet of the cooling device is connected.
Preferably, the CO is2Outlet of cooling device and said CO2The inlets of the main compression devices are connected.
Preferably, the CO is2Outlet of main compressor and said second CO2And a second inlet of the heat regenerator is connected.
Preferably, the second CO2A first outlet of the heat regenerator and the first CO2And a second inlet of the heat regenerator is connected.
Preferably, the first CO2Second outlet of heat regenerator and CO2And the second inlet of the heat exchange device is connected.
As a preferable embodiment of the present invention, the second CO is2Second outlet of heat regenerator and CO2The inlet of the bypass compression device is connected.
Preferably, the CO is2Bypassing an outlet of a compression device with the first CO2And a second inlet of the heat regenerator is connected.
As a preferred technical solution of the present invention, the compressed air energy storage sub-circulation system further includes an electric motor.
Preferably, the output shaft of the motor is connected to a compression device.
In the present invention, the motor is used for driving the compression device.
The invention also provides an application of the compressed air energy storage and supercritical carbon dioxide energy release coupling system, wherein the application comprises an energy storage method and an energy release method.
The energy storage method comprises the following steps: the air enters the heat regenerative device to be heated, is compressed and consumed by the compression device, is stored with heat by the heat exchange device, then enters the heat regenerative device to be heated, and is discharged after being expanded and applied by the turbine.
The energy releasing method comprises the following steps: CO passing through heat storage component2Heating is carried out, the CO2By CO2CO is fed into the heat exchange device2Turbine expands to do work and passes through the first CO2Regenerative device and secondary CO2The heat regenerator exchanges heat, releases heat and then divides into two branches, one branch passes through CO2Compressing with a bypass compressor, passing CO through the other path2The cooled CO enters the cooling device in sequence2Main compressor compressing, secondary CO2After heat release of the heat regenerator, the heat is mixed with CO2CO bypassing a compression device2After being merged, enters first CO2After the heat regeneration device absorbs heat, the CO returns to2And a heat exchange device.
Compared with the prior art, the invention has the following beneficial effects:
the coupling system provided by the invention can be used for improving the running stability of the system, adjusting the frequency and compensating the load fluctuation; the coupling system can absorb electric power storage energy in the low ebb of electricity consumption and complete energy release in the high ebb of electricity consumption, meets the requirements of fast response of load change of a power grid and peak clipping and valley filling, reduces power supply cost, and has high energy storage efficiency and good environmental benefit.
Drawings
FIG. 1 is a schematic diagram of a compressed air energy storage and supercritical carbon dioxide energy release coupling system provided in example 1 of the present invention;
FIG. 2 is a schematic diagram of a compressed air energy storage and supercritical carbon dioxide energy release coupling system provided in example 2 of the present invention;
fig. 3 is a graph showing the effect of the outlet pressure of the compression device in the energy storage sub-cycle on the efficiency of the energy storage cycle using the coupling system provided in example 2.
FIG. 4 is a graph showing the effect of the inlet temperature at the low temperature end of the heat recovery device on the energy storage efficiency in the energy storage sub-cycle using the coupling system provided in example 2.
Fig. 5 is a graph showing the effect of the cold end difference of the heat recovery device on the energy storage efficiency in the energy storage sub-cycle by applying the coupling system provided in example 2.
Fig. 6 is a specific parameter diagram of the energy storage sub-cycle after the energy storage efficiency is optimized by applying the coupling system provided in example 2.
Fig. 7 is a T-S diagram of the energy storage sub-cycle after energy storage efficiency optimization using the coupling system provided in example 2.
Fig. 8 is a graph showing the end difference of the heat recovery device in the energy storage sub-cycle after the energy storage efficiency is optimized by applying the coupling system provided in example 2.
FIG. 9 shows the energy storage sub-cycle after energy storage efficiency optimization using the coupling system provided in example 2
Figure BDA0003363898890000061
Loss profile.
Wherein 1-a heat regenerative device; 2-a compression device; 3-a heat exchange device; 4-turbine; 5-a first storage tank;6-a second storage tank; 7-CO2A heat exchange device; 8-CO2A turbine; 9-first CO2A heat regenerative device; 10-second CO2A heat regenerative device; 11-CO2A cooling device; 12-CO2A main compression device; 13-CO2Bypassing the compression device.
Detailed Description
It should be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "connected," and "connected" in the description of the present invention are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected: can be mechanically or electrically connected; they may be connected directly or indirectly through an intermediary, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Example 1
The embodiment provides a compressed air energy storage and supercritical carbon dioxide energy release coupling system, as shown in fig. 1, the coupling system comprises a heat regenerator 1, a compressor 2, a heat exchanger 3, a turbine 4, a motor, a first storage tank 5, a second storage tank 6, and CO2Heat exchanger 7, CO2Turbine 8, first CO2Heat regenerator 9, second CO2Heat regenerator 10, CO2Cooling device 11 and CO2A main compression unit 12.
The turbine 4 is coaxially connected with the compression device 2, an output shaft of the motor is connected with the compression device 2, an outlet of the compression device 2 is connected with a first inlet of the heat exchange device 3, a first outlet of the heat exchange device 3 is connected with a second inlet of the heat regeneration device 1, a first outlet of the heat regeneration device 1 is connected with an inlet of the turbine 4, a second outlet of the heat regeneration device 1 is connected with an inlet of the compression device 2, an outlet of the first storage tank 5 is connected with a second inlet of the heat exchange device 3, a second outlet of the heat exchange device 3 is connected with an inlet of the second storage tank 6, and the heat regeneration device 1 is provided with a gas inlet.
The CO is2A first outlet of the heat exchange means 7 and said CO2Inlet connection of turbine 8, said CO2The outlet of the turbine 8 and said first CO2The first inlet of the heat regenerator 9 is connected with the first CO2The first outlet of the heat regenerator 9 and the second CO2The first inlet of the heat regenerator 10 is connected with the second CO2First outlet of the heat regenerator 10 and the CO2Inlet connection of cooling device 11, said CO2The outlet of the cooling device 11 and the CO2Inlet connection of main compressor 12, said CO2The outlet of the main compression unit 12 and the secondary CO2The second inlet of the heat regenerator 10 is connected, and the second CO is connected2The first outlet of the heat regenerator 10 and the first CO2The second inlet of the heat recovery device 9 is connected, and the first CO is connected2A second outlet of the heat recovery device 9 and said CO2A second inlet of the heat exchange device 7 is connected, and an outlet of the second storage tank 6 is connected with the CO2A second inlet of the heat exchange device 7 is connected, and CO is introduced2A second outlet of the heat exchanging device 7 is connected to an inlet of the first storage tank 5.
The compressed air energy storage and supercritical carbon dioxide energy release coupling system provided by the invention is applied to store and release energy, and the energy storage method comprises the following steps: the inlet of the heat recovery device 1 is connected with the environment, air enters the heat recovery device 1 to be heated, then is compressed by the compression device 2 to consume work, then is heated by the heat exchange device 3 to be fused salt, enters the heat recovery device 1 to be heated, and is expanded by the turbine 4 to do work and then is exhausted. The outlet of the first storage tank 5 is connected with the second inlet of the heat exchange device 3, and the second outlet of the heat exchange device 3 is connected with the inlet of the second storage tank 6, so that heat storage is completed.
The energy release method comprises the following steps: CO 22By CO2CO enters the heat exchange device 72 Turbine 8 expansionExpansion acting sequentially through the first CO2Regenerative device 9 and secondary CO2Heat exchange is performed by the heat regenerator 10 through CO2The CO enters the cooling device 11 after being cooled2 Main compressor 12 compresses, secondary CO2The heat regenerator 10 releases heat and then enters the first CO2After absorbing heat, the heat regenerator 9 returns to CO2Heat exchanger 7, outlet of second storage tank 6 and CO2Second inlet connection of heat exchanger 7, CO2A second outlet of the heat exchange device 7 is connected with an inlet of the first storage tank 5 to complete CO separation2Heating of (2).
Example 2
The present embodiment provides a compressed air energy storage and supercritical carbon dioxide energy release coupling system, as shown in fig. 2, the coupling system of the present embodiment differs from the coupling system of embodiment 1 only in that: the implementation increases CO2Bypassing the compression device 13. The second CO2Second outlet of the heat regenerator 10 and the CO2Inlet connection of a bypass compression device 13, the CO2Bypassing the outlet of the compression device 13 with said first CO2And a second inlet of the heat regenerator 9 is connected.
The compressed air energy storage and supercritical carbon dioxide energy release coupling system provided by the invention is applied to store and release energy, and the energy storage method comprises the following steps: the inlet of the heat recovery device 1 is connected with the environment, air enters the heat recovery device 1 to be heated, then is compressed by the compression device 2 to consume work, then is heated by the heat exchange device 3 to be fused salt, enters the heat recovery device 1 to be heated, and is expanded by the turbine 4 to do work and then is exhausted. The outlet of the first storage tank 5 is connected with the second inlet of the heat exchange device 3, and the second outlet of the heat exchange device 3 is connected with the inlet of the second storage tank 6, so that heat storage is completed.
The energy release method comprises the following steps: CO 22By CO2CO enters the heat exchange device 72 Turbine 8 expands to produce work, which in turn passes through the first CO2Regenerative device 9 and secondary CO2The heat regenerator 10 exchanges heat, and is divided into two branches after heat exchange, wherein one branch passes through CO2The bypass compressor 13 compresses, and the other path passes through CO2The CO enters the cooling device 11 after being cooled2 Main compressor 12 compresses, secondary CO2After heat release, the heat regenerator 10 reacts with CO2Bypassing CO of the compression device 122After being merged, enters first CO2After absorbing heat, the heat regenerator 9 returns to CO2And a heat exchange device 7. Outlet of the second storage tank 6 and CO2Second inlet connection of heat exchanger 7, CO2The second outlet of the heat exchange device 7 is connected with the inlet of the first storage tank 5 to complete CO separation2Heating of (2).
The coupling system provided in example 2 is applied to store and release energy, and the energy release efficiency and the energy storage efficiency are studied. The energy storage time is set to be 8 hours, the energy release time is set to be 4 hours, the energy release sub-cycle is set to be 30MWe, and the energy storage sub-cycle is set to be 15 MW.
Explore CO2The effect of different inlet temperatures of the turbine on the efficiency of the energy release sub-cycle system is shown in table 1.
TABLE 1
CO2Turbine inlet temperature/° c Energy release subcycle efficiency/%)
500 35.58
525 37.09
550 38.61
575 39.98
600 41.14
As can be seen from Table 1, the efficiency of the energy release sub-cycle is dependent on the CO2The turbine inlet temperature increases.
The basic assumptions and constraints of the compressed air energy storage sub-cycle system are as follows: the pressure loss of the air in the heat recovery device and the heat exchange device is 2 percent, and the pressure loss in each section of pipeline is ignored; the heat exchange loss and leakage loss of air in different devices and pipelines of each section are not considered; the temperature of the turbine outlet is not lower than-5 ℃; the difference of the pipeline ends of each section of the heat recovery device is not lower than 5 ℃ so as to keep normal heat exchange.
The heating energy efficiency ratio refers to the ratio of the heat energy generated by the system to the mechanical work used for generating the heat energy and the cold energy in the whole operation process of the system. For the energy storage system, the heating energy efficiency ratio is the ratio of the stored heat energy to the input power, and the specific expression is as follows:
Figure BDA0003363898890000101
the expression of the energy storage efficiency of the compressed air energy storage sub-circulation system is as follows:
Figure BDA0003363898890000102
energy release subcycle CO2The inlet temperature of the turbine and the outlet temperature of the energy storage sub-cycle compression device need to be matched with each other, and the specific parameter setting and the efficiency of the compression device are shown in table 2.
TABLE 2
CO2Turbine inlet temperature/° c Exit temperature/. degree.C.of compression device Compression apparatus efficiency/%)
500 510 76.1
525 535 75.8
550 560 75.4
575 585 75.1
600 610 74.4
The influence of the three independent parameters on the performance of the compressed air energy storage sub-circulation system is researched on the outlet pressure of a compression device in the compressed air energy storage sub-circulation system, the cold end difference of a heat regeneration device and the inlet temperature of a low temperature end.
Under the condition that the cold end difference of the heat recovery device is kept at 20 ℃ and the inlet temperature of the low temperature end is kept unchanged, the influence of the outlet pressure of the compression device on the energy storage cycle efficiency is researched by changing the outlet pressure of the compression device, wherein the outlet pressure of the compression device is 140-300Kpa, and the result is shown in FIG. 3.
As can be seen from fig. 3, the energy storage efficiency increases with the increase in the outlet pressure of the compression device, but the rate of increase gradually slows; under the temperature of not more than 610 ℃, the higher the temperature of the outlet of the compression device in the compressed air energy storage sub-circulation system is, the higher the energy storage efficiency is.
The outlet pressure of the compression device is 200Kpa, the cold end difference of the heat recovery device is 20 ℃, the influence of the inlet temperature of the low-temperature end of the heat recovery device on the energy storage efficiency is researched by changing the inlet temperature of the low-temperature end of the heat recovery device, and the result is shown in figure 4.
As can be seen from fig. 4, under the condition that the cold end difference of the regenerative device and the outlet pressure of the compression device are not changed, the energy storage efficiency is improved along with the increase of the inlet temperature of the low temperature end of the regenerative device; under the temperature of not more than 610 ℃, the higher the temperature of the outlet of the compression device in the compressed air energy storage sub-circulation system is, the higher the energy storage efficiency is.
The outlet pressure of the compression device is 200Kpa, the inlet temperature of the low-temperature end of the heat recovery device is 20 ℃, the influence of the cold-end difference of the heat recovery device on the energy storage efficiency is researched by changing the cold-end difference of the heat recovery device, and the result is shown in figure 5.
As can be seen from fig. 5, under the condition that the outlet pressure of the compression device and the inlet temperature of the low temperature end of the regenerative device are not changed, the energy storage efficiency decreases with the increase of the cold end difference of the regenerative device; under the temperature of not more than 610 ℃, the higher the temperature of the outlet of the compression device in the compressed air energy storage sub-circulation system is, the higher the energy storage efficiency is.
Optimizing an energy storage system: the compressed air energy storage sub-cycle system at a compressor outlet temperature of 610 ℃ was optimized in MATLAB using the generic function method.
After the energy storage system is optimized, specific parameters of the compressed air energy storage sub-circulation system are shown in fig. 6, and as can be seen from fig. 6, the pressure loss of the high-pressure fluid of the heat regenerator is 4.25 Kpa; the pressure loss of the low-pressure fluid of the heat recovery device is 2.00 Kpa; the pressure loss of the heat storage section is 4.33 KPa; the turbine power was 3.522 Mw; the compression plant power was 16.253 Mw; the power of the motor is 12.925 MW; the ambient endothermic power was 2.269 Mw; the heat power of the heat recovery device is 24.458 MW; the heat storage power of the system is 15.00 MW; COP-h (heat storage capacity/effective input power) 1.161; the energy storage efficiency is 47.74%.
After the energy storage system is optimized, the T-S of the compressed air energy storage sub-circulation system is shown in figure 7, which shows that the air completes approximate constant pressure heating in the heat recovery device, passes through the compression power consumption in the compression device, completes approximate constant pressure heat release in the heat exchange device, enters the heat recovery device again to complete constant pressure heating, and finally is exhausted after expanding and acting in the turbine.
After the energy storage system is optimized, the end difference of the regenerative device of the compressed air energy storage sub-circulation system is shown in fig. 8, wherein the minimum end difference of the regenerative device is 17.65 ℃, the constraint condition is met, the regenerative is not influenced, and the system is optimized
Figure BDA0003363898890000121
The inlet temperature of the low-temperature end of the analysis device is 28.92 ℃, the difference of the cold end of the heat recovery device is 18.93 ℃, and the energy storage efficiency of the system is 47.74%.
Compressed air energy-storage sub-circulation system after energy-storage efficiency is optimized
Figure BDA0003363898890000122
The loss distribution is shown in FIG. 9. As can be seen from FIG. 9, the heat recovery device is a system
Figure BDA0003363898890000123
The most damaging link, turbine, is the system
Figure BDA0003363898890000124
The least lossy link.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. A compressed air energy storage and supercritical carbon dioxide energy release coupling system is characterized in that the coupling system comprises a compressed air energy storage sub-circulation system and a supercritical carbon dioxide energy release sub-circulation system;
the compressed air energy storage sub-circulation system comprises a heat regeneration device, a compression device, a heat exchange device, a turbine and a heat storage assembly;
the supercritical carbon dioxide energy release sub-circulation system comprises CO2Turbine, CO2Regenerative assembly, CO2Cooling device, CO2Main compressor, CO2Bypass compression device, CO2Heat exchange device and heat-retaining subassembly.
2. The coupling system of claim 1, wherein the circulating fluid of the compressed air energy storage sub-circulation system comprises air.
3. The coupling system of claim 1 or 2, wherein the circulating fluid of the supercritical carbon dioxide energy-releasing sub-cycle system comprises CO2。
4. The coupling system of any one of claims 1-3, wherein the thermal storage assembly comprises a first storage tank and a second storage tank;
preferably, the heat storage medium of the first storage tank comprises a molten salt;
preferably, the heat storage medium of the second storage tank comprises a molten salt.
5. The coupling system of any one of claims 1-4, wherein an outlet of the first storage tank is connected to a second inlet of the heat exchange device;
preferably, the second outlet of the heat exchange device is connected with the inlet of the second storage tank;
preferably, an outlet of the second storage tank is in communication with the CO2The second inlet of the heat exchange device is connected;
preferably, the CO is2And a second outlet of the heat exchange device is connected with an inlet of the first storage tank.
6. The coupling system of any one of claims 1-5, wherein the turbine is coaxially connected to the compression device;
preferably, the outlet of the compression device is connected with the first inlet of the heat exchange device;
preferably, the first outlet of the heat exchange device is connected with the second inlet of the heat regenerator;
preferably, the first outlet of the heat regenerator is connected with the inlet of the turbine;
preferably, the second outlet of the heat regenerator is connected to the inlet of the compressor;
preferably, the heat recovery device is provided with a gas inlet.
7. The coupling system of any one of claims 1-6, wherein the CO is present in a gas phase2The regenerative assembly includes a first CO2Regenerative device and secondary CO2A heat recovery device.
8. The coupling system of any one of claims 1-7, wherein the CO is present in a gas phase2A first outlet of the heat exchange device and the CO2The inlet of the turbine is connected;
preferably, the CO is2Outlet of turbine and said first CO2The first inlet of the heat regenerative device is connected;
preferably, the first CO2First outlet of heat regenerator and second CO2The first inlet of the heat regenerative device is connected;
preferably, the second CO2A first outlet of the heat regenerator and the CO2The inlet of the cooling device is connected;
preferably, the CO is2Outlet of cooling device and said CO2The inlet of the main compression device is connected;
preferably, the CO is2Outlet of main compressor and said second CO2The second inlet of the heat regenerative device is connected;
preferably, the second CO2A first outlet of the heat regenerator and the first CO2The second inlet of the heat regenerative device is connected;
preferably, the firstCO2Second outlet of heat regenerator and CO2And a second inlet of the heat exchange device is connected.
9. The coupling system of any one of claims 1-8, wherein the second CO is2Second outlet of heat regenerator and CO2The inlet of the bypass compression device is connected;
preferably, the CO is2Bypassing an outlet of a compression device with the first CO2And a second inlet of the heat regenerator is connected.
10. The coupling system of any one of claims 1-9, wherein the compressed air energy storage sub-circulation system further comprises an electric motor;
preferably, the output shaft of the motor is connected to a compression device.
CN202111376122.7A 2021-11-19 2021-11-19 Compressed air energy storage and supercritical carbon dioxide energy release coupling system Pending CN114151155A (en)

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Publication number Priority date Publication date Assignee Title
KR101731051B1 (en) * 2016-08-23 2017-04-27 고등기술연구원연구조합 System and method for high efficiency power generation using supercritical carbon dioxide
CN107035447A (en) * 2017-04-14 2017-08-11 南京航空航天大学 Compress supercritical carbon dioxide accumulation of energy hold over system and its method of work
CN208024412U (en) * 2018-01-17 2018-10-30 上海发电设备成套设计研究院有限责任公司 A kind of compressed-air energy-storage system
CN109340066A (en) * 2018-10-16 2019-02-15 中国科学院工程热物理研究所 A kind of supercritical carbon dioxide solar power generation energy storage integrated system
CN111749739A (en) * 2020-07-28 2020-10-09 杭州汽轮机股份有限公司 Supercritical carbon dioxide recompression cycle power generation system and operation method

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
KR101731051B1 (en) * 2016-08-23 2017-04-27 고등기술연구원연구조합 System and method for high efficiency power generation using supercritical carbon dioxide
CN107035447A (en) * 2017-04-14 2017-08-11 南京航空航天大学 Compress supercritical carbon dioxide accumulation of energy hold over system and its method of work
CN208024412U (en) * 2018-01-17 2018-10-30 上海发电设备成套设计研究院有限责任公司 A kind of compressed-air energy-storage system
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