CN112985142A - Heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase change - Google Patents
Heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase change Download PDFInfo
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- CN112985142A CN112985142A CN202110169183.XA CN202110169183A CN112985142A CN 112985142 A CN112985142 A CN 112985142A CN 202110169183 A CN202110169183 A CN 202110169183A CN 112985142 A CN112985142 A CN 112985142A
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- 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
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Engine Equipment That Uses Special Cycles (AREA)
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Abstract
The invention relates to a carbon dioxide gas-liquid phase change-based thermal energy-to-mechanical energy storage device, which comprises: a gas storage; a liquid storage tank; the energy storage assembly is arranged between the gas storage and the liquid storage tank, the carbon dioxide is changed from a gas state to a liquid state through the energy storage assembly, and the energy storage assembly comprises a compressor; the energy release component is arranged between the gas storage and the liquid storage tank, and the carbon dioxide is changed into a gas state from a liquid state through the energy release component; the heat exchange assembly can transfer part of energy generated in the energy storage assembly to the energy release assembly; the driving assembly is connected with the energy storage assembly and comprises an energy input part and a first driving part, part of carbon dioxide flowing out of the compressor can be shunted to the driving assembly, the carbon dioxide shunted to the driving assembly can absorb external heat energy through the energy input part and drive the first driving part to work, and the first driving part can drive the compressor to work. The device can utilize waste heat generated in industrial production, thereby reducing heat energy waste and saving energy.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change.
Background
With the development of social economy, people have higher and higher demand for energy, but the increase of energy consumption makes environmental problems more serious, and non-renewable traditional energy sources such as coal, petroleum and the like are increasingly exhausted. At present, new energy sources such as solar energy and wind energy which are vigorously developed can slow down the consumption of traditional energy sources to a certain extent, but the new energy sources have intermittent and fluctuating characteristics which can cause certain impact on a power grid, so that the effective utilization rate is low. The energy storage technology can realize peak clipping and valley filling of a power grid, compensate fluctuation of renewable energy sources, improve annual utilization hours of a renewable energy source generator set, reduce phenomena of wind abandonment, light abandonment and the like, can store low-valley electric energy at night so as to be used in power utilization peak hours, and has great significance for optimization and adjustment of an energy system.
The traditional compressed air energy storage system depends on the combustion of fossil fuel to provide the input energy required by the system operation, and does not accord with the development trend of green energy. In the related art, there is a way of energy storage by compressing carbon dioxide. The main principle is that during the electricity consumption valley period, the carbon dioxide is compressed by using redundant electricity and stored. When the power consumption is in a peak period, the power is released and the turbine drives the generator to output power, so that the energy is fully utilized, and the impact of the intermittent power generation of new energy on a power grid is reduced. However, in natural environment and industrial and agricultural production, there is heat energy generated by geothermal heat, solar photo-thermal, biomass burning, garbage burning, etc., and the heat energy is usually released directly to the environment, causing great waste.
Disclosure of Invention
Based on the device, the invention provides the energy storage device for converting the heat energy into the mechanical energy based on the carbon dioxide gas-liquid phase change, and the device can utilize the heat energy generated by terrestrial heat, solar photo-heat, biomass combustion and waste incineration, waste heat generated in the industrial production process and the like, thereby improving the resource utilization rate and saving energy.
Heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase transition includes:
a gas reservoir for storing gaseous carbon dioxide, the volume of the gas reservoir being variable;
the liquid storage tank is used for storing liquid carbon dioxide;
the energy storage assembly is used for storing energy, the energy storage assembly is arranged between the gas storage and the liquid storage tank, carbon dioxide is converted from a gaseous state to a liquid state through the energy storage assembly, the energy storage assembly comprises a compressor, and the compressor is used for compressing the carbon dioxide;
the energy releasing component is used for releasing energy and arranged between the gas storage and the liquid storage tank, and carbon dioxide is converted from a liquid state to a gas state through the energy releasing component;
the energy storage assembly and the energy release assembly are both connected with the heat exchange assembly, and the heat exchange assembly can transfer part of energy generated in the energy storage assembly into the energy release assembly;
the driving assembly is connected with the energy storage assembly and comprises an energy input part and a first driving part, partial carbon dioxide flowing out of the compressor can be shunted to the driving assembly, and the carbon dioxide shunted to the driving assembly can be absorbed by the energy input part to absorb external heat energy and drive the first driving part to work, and the first driving part can drive the compressor to work.
In one embodiment, the driving assembly further comprises a second driving member, the second driving member can be connected with the compressor, and when the first driving member is not started, the second driving member can drive the compressor to work.
In one embodiment, the first and second drivers are disposed coaxially with the compressor.
In one embodiment, the compressors and the driving assemblies are respectively provided with a plurality of driving assemblies, the compressors and the driving assemblies are in one-to-one correspondence, part of carbon dioxide flowing out of the compressors can be distributed to the corresponding driving assemblies, and the first driving member in each driving assembly can drive the corresponding compressor to work.
In one embodiment, the drive assembly further comprises a drive cycle cooler, the energy input is connected to the compressor, the first drive is connected to the energy input, the drive cycle cooler is connected to the first drive, and the compressor is connected to the drive cycle cooler, the drive cycle cooler is configured to cool carbon dioxide flowing from the first drive to the compressor.
In one embodiment, the energy storage assembly comprises a condenser and a compression energy storage part, the compression energy storage part is at least provided with one group, the compression energy storage part comprises a compressor and an energy storage heat exchanger, the energy storage heat exchanger in each compression energy storage part is connected with the compressor, the energy storage heat exchanger in each compression energy storage part is connected with the adjacent compressor in the compression energy storage part, the compressor in the compression energy storage part at the beginning is connected with the gas storage, the energy storage heat exchanger in the compression energy storage part at the end is connected with the condenser, the liquid storage tank is connected with the condenser, the heat exchange assembly is connected with the energy storage heat exchanger, part of carbon dioxide flowing out of the compressor flows into the corresponding energy storage heat exchanger, part of carbon dioxide flows into the corresponding driving assembly, and the energy storage heat exchanger can transfer part of energy generated when the carbon dioxide is compressed by the compressor to the corresponding driving assembly The heat exchange assembly.
In one embodiment, the energy releasing assembly comprises an evaporator, an expansion energy releasing part and an energy releasing cooler, the expansion energy release part is provided with at least one group and comprises an energy release heat exchanger and an expander, the expander in each expansion energy release part is connected with the energy release heat exchanger in the adjacent expansion energy release part, the evaporator is connected with the liquid storage tank, the energy releasing heat exchanger in the expansion energy releasing part at the initial end is connected with the evaporator, the expander in the expansion energy releasing part at the tail end is connected with the energy releasing cooler, the gas storage is connected with the energy release cooler, the heat exchange assembly is connected with the energy release heat exchanger, and carbon dioxide flowing through the energy release heat exchanger can absorb energy temporarily stored in the heat exchange assembly.
In one of them embodiment, the heat transfer subassembly includes cold storage tank and heat storage tank, cold storage tank with be equipped with heat transfer medium in the heat storage tank, cold storage tank heat storage tank be in the energy storage subassembly with form the heat transfer return circuit between the energy release subassembly, heat transfer medium can flow in the heat transfer return circuit, heat transfer medium follows cold storage tank flows to when the heat storage tank, can save the partial energy that the energy storage subassembly produced, heat transfer medium follows heat storage tank flows to when the cold storage tank, can shift the energy of storage to the energy release subassembly.
In one embodiment, the energy release assembly includes an evaporator through which carbon dioxide is converted from a liquid state to a gaseous state, and the heat exchange assembly further includes a heat exchange medium cooler for cooling the heat exchange medium entering the heat storage tank, and the heat exchange medium cooler is connected to the evaporator.
In one embodiment, an auxiliary heating element is arranged between the cold storage tank and the heat storage tank, and part of the heat exchange medium can flow into the heat storage tank after being heated by the auxiliary heating element.
In one embodiment, the energy releasing assembly comprises a throttle expansion valve and an evaporator, the carbon dioxide is changed from liquid state to gaseous state by the evaporator, the throttle expansion valve is positioned between the liquid storage tank and the evaporator, and the throttle expansion valve is used for reducing the pressure of the carbon dioxide flowing out of the liquid storage tank;
the energy storage assembly comprises a condenser, carbon dioxide is converted from a gaseous state to a liquid state through the condenser, and the evaporator is connected with the condenser.
In one embodiment, the energy releasing assembly comprises an evaporator through which the carbon dioxide is transformed from a liquid state to a gaseous state, and an energy releasing cooler for cooling the carbon dioxide entering the gas storage, the energy releasing cooler being connected to the evaporator.
In one embodiment, the reservoir is a flexible gas membrane reservoir.
The above-mentioned heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase transition has set up gas storage storehouse and liquid storage pot, and gaseous carbon dioxide is saved in the gas storage storehouse, and liquid carbon dioxide is saved in the liquid storage pot. An energy storage component and an energy release component are arranged between the gas storage and the liquid storage tank, and a heat exchange component is also arranged between the energy release component and the energy storage component. The carbon dioxide is changed from a gas state to a liquid state when passing through the energy storage assembly and is changed from a liquid state to a gas state when passing through the energy release assembly. When the carbon dioxide reaches the liquid storage tank from the gas storage through the energy storage assembly, energy storage is completed, part of energy is stored in the carbon dioxide, part of energy is stored in the heat exchange assembly and is transferred to the energy release assembly, and energy release is completed through the energy release assembly. The compressor is used for compressing the carbon dioxide of flowing out the gas storage storehouse, and when carbon dioxide flowed out from the compressor, partly reposition of redundant personnel to drive assembly, when this part carbon dioxide flowed through energy input spare, can absorb outside heat energy to drive first driving piece work, when first driving piece during operation, can drive compressor work. In the device, the compressor can be driven to work by utilizing energy sources such as geothermal energy, photothermal energy, heat energy generated by waste incineration, waste heat generated in the industrial production process and the like, so that the resource waste is reduced, and the energy is saved.
Drawings
FIG. 1 is a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the first driving member, the second driving member and the compressor shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in another embodiment of the invention;
FIG. 4 is a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in another embodiment of the present invention.
Reference numerals:
a gas storage 100;
a liquid storage tank 200;
the system comprises an energy storage assembly 300, a compressor 310, an energy storage heat exchanger 320, a condenser 330, an energy storage first pipeline 340, an energy storage second pipeline 350, an energy storage third pipeline 360 and an energy storage fourth pipeline 370;
the energy release assembly 400, the evaporator 410, the energy release heat exchanger 420, the expander 430, the energy release cooler 440, the energy release first conduit 450, the energy release second conduit 460, the energy release third conduit 470, the energy release fourth conduit 480, the energy release fifth conduit 490, the throttle expansion valve 4100, the generator 4200, the energy release sixth conduit 4500;
the system comprises a heat exchange assembly 500, a cold storage tank 510, a heat storage tank 520, a heat exchange medium cooler 530, a heat exchange first pipeline 540, a heat exchange second pipeline 550, a heat exchange third pipeline 560, a heat exchange fourth pipeline 570, a heat exchange medium first circulating pump 580 and a heat exchange medium second circulating pump 581;
the first valve 610, the second valve 620, the third valve 630, the fourth valve 640, the fifth valve 650, the sixth valve 660, the seventh valve 670, the eighth valve 680, and the ninth valve 6200;
a water tank 710, a first recovery duct 720, a second recovery duct 730, a third recovery duct 740, a fourth recovery duct 750, a fifth recovery duct 760, a sixth recovery duct 770;
an auxiliary heating member 810, a heating pipe 820;
a drive assembly 900, an energy input 910, a first drive 920, a drive cycle cooler 930, a drive cycle first conduit 940, a drive cycle second conduit 950, a drive cycle third conduit 960, a drive cycle fourth conduit 970, and a second drive 980.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
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 device or element must have a particular orientation, be constructed and operated in a particular orientation, and are 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 expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in an embodiment of the present invention. The device for converting thermal energy into mechanical energy and storing energy based on carbon dioxide gas-liquid phase change comprises a gas storage 100, a liquid storage tank 200, an energy storage assembly 300, an energy releasing assembly 400, a heat exchange assembly 500, a driving assembly 900 and the like.
The liquid carbon dioxide is stored in the liquid storage tank 200 in a high pressure state. Gaseous carbon dioxide in a normal temperature and pressure state is stored in the gas storage 100, and the pressure and the temperature inside the gas storage 100 are maintained within a certain range so as to meet the energy storage requirement. Specifically, a heat-insulating device is provided to insulate the gas storage 100 so that the temperature therein is maintained within a desired range. When the temperature and pressure are constant, the volume is proportional to the amount of substance, according to the ideal gas state equation PV-nRT. Therefore, the gas reservoir 100 is a gas membrane gas reservoir whose volume can be changed, and when carbon dioxide is charged, the volume of the gas reservoir 100 is increased, and when carbon dioxide is discharged, the volume of the gas reservoir 100 is decreased, thereby achieving a constant pressure in the gas reservoir 100. The pressure and temperature inside the gas storage 100 are maintained within a certain range, and in the above analysis, they are regarded as approximately constant values.
In particular, the temperature T within the reservoir 1001The range of T is more than or equal to 15 DEG C1The temperature is less than or equal to 35 ℃, and the air pressure difference between the air pressure in the air storage 100 and the outside atmosphere is less than 1000 Pa.
The energy storage assembly 300 is located between the gas storage 100 and the liquid storage tank 200, and the gaseous carbon dioxide flowing out of the gas storage 100 is converted into a liquid state by the energy storage assembly 300 and flows into the liquid storage tank 200, thereby completing energy storage in the process. The energy storage assembly 300 includes a compressor 310, and the gaseous carbon dioxide flowing out of the gas storage 100 is compressed by the compressor 310 to be pressurized.
The energy release assembly 400 is also located between the gas storage 100 and the liquid storage tank 200, and liquid carbon dioxide flowing out of the liquid storage tank 200 is converted into a gaseous state by the energy release assembly 400 and flows into the gas storage 100, during which the energy stored during the energy storage is released.
The heat exchange assembly 500 is disposed between the energy storage assembly 300 and the energy releasing assembly 400. In the energy storage process, a part of the stored energy is stored in the liquid carbon dioxide in a high pressure state in the form of pressure energy, and another part is stored in the heat exchange assembly 500 in the form of heat energy. During the energy release process, this portion of energy is transferred from the heat exchange assembly 500 to the energy release assembly 400 and all of the stored energy is released out by the gaseous carbon dioxide.
The driving assembly 900 is connected to the energy storage assembly 300, and a part of the carbon dioxide compressed by the compressor 310 is diverted to the driving assembly 900. The driving assembly 900 includes an energy input member 910 and a first driving member 920, wherein the energy input member 910 is connected to an external heat source and can absorb heat energy provided by the external heat source. When the carbon dioxide diverted to the driving assembly 900 flows through the energy input member 910, the external heat energy inputted through the energy input member 910 can be absorbed. When the flow continues to the first driving member 920, the first driving member 920 can be driven to operate, and the compressor 310 can be driven to operate by the first driving member 920. The first driver 920 may be a turbine or the like.
In summary, the first driving member 920 is driven to operate by the pressure energy and the heat energy increased after the carbon dioxide is compressed and the external heat energy inputted through the energy input member 910, and then the compressor 310 is driven to operate by the first driving member 920.
The energy storage device in this embodiment realizes the conversion of carbon dioxide from gaseous state to liquid state through external energy sources such as geothermal energy, solar photothermal energy, heat energy generated by biomass combustion and waste incineration, and stores the energy. During the standby electricity peak period, the part of energy is released to drive the generator 4200 to generate electric energy. Therefore, energy waste can be reduced, and the generated energy burden of a power plant can be reduced.
Energy memory in this embodiment, carbon dioxide only changes between gaseous state and liquid, and before the energy storage, carbon dioxide is in the gaseous state, and for normal atmospheric temperature, compare in the conventional energy storage energy release through supercritical carbon dioxide, lower to the requirement of gas storage 100 in this embodiment, need not to set up the comparatively complicated storage part of structure, can reduce cost to a certain extent.
The energy storage device in this embodiment, it has set up less subassembly, and the structure is simple relatively, and the pipe arrangement is comparatively easy.
In some embodiments, the energy storage assembly 300 includes a compressor 310, an energy storage heat exchanger 320, and a condenser 330. The compressor 310 is connected with the gas storage 100 through an energy storage first pipeline 340, the energy storage heat exchanger 320 is connected with the compressor 310 through an energy storage second pipeline 350, the condenser 330 is connected with the energy storage heat exchanger 320 through an energy storage third pipeline 360, and the liquid storage tank 200 is connected with the condenser 330 through an energy storage fourth pipeline 370.
The heat exchange assembly 500 is connected with the energy storage heat exchanger 320, part of energy generated when the compressor 310 compresses the carbon dioxide is stored in the high-pressure carbon dioxide in the form of pressure energy, and part of energy is transferred to the heat exchange assembly 500 for temporary storage in the form of heat energy through the energy storage heat exchanger 320.
One energy storage heat exchanger 320 is correspondingly connected with one compressor 310, and the two can be regarded as compression energy storage parts. Preferably, a plurality of sets of compression energy storage parts connected in sequence can be arranged between the gas storage 100 and the condenser 330. In this manner, the carbon dioxide is gradually pressurized by multi-stage compression. When a plurality of compressors 310 are provided, a compressor having a smaller compression ratio can be selected, and the cost of the compressor 310 is lower. The compressor in the initial compression energy storage part is connected to the gas storage 100, the energy storage heat exchanger in the final compression energy storage part is connected to the condenser 330, and the energy storage heat exchanger in each compression energy storage part is connected to the compressor in the adjacent compression energy storage part. The beginning and end are defined herein in the direction from the gas reservoir 100 through the energy storage assembly 300 to the fluid reservoir 200. If there is only one group of the compressed energy storage parts, the beginning and the end are the only group of the compressed energy storage parts.
In some embodiments, the energy release assembly 400 includes an evaporator 410, an energy release heat exchanger 420, an expander 430, and an energy release cooler 440. The evaporator 410 is connected with the liquid storage tank 200 through an energy releasing first pipeline 450, the energy releasing heat exchanger 420 is connected with the evaporator 410 through an energy releasing second pipeline 460, the expander 430 is connected with the energy releasing heat exchanger 420 through an energy releasing third pipeline 470, the energy releasing cooler 440 is connected with the expander 430 through an energy releasing fourth pipeline 480, and the gas storage tank 100 is connected with the energy releasing cooler 440 through an energy releasing fifth pipeline 490.
The heat exchange assembly 500 is connected to the energy releasing heat exchanger 420, and during the energy releasing process, the heat temporarily stored in the heat exchange assembly 500 is transferred to the gaseous carbon dioxide flowing through the energy releasing heat exchanger 420, and the carbon dioxide absorbs the heat and releases the energy through the expander 430.
In the energy release assembly 400, the energy stored in the energy storage process is released through the expander 430, and the generator 4200 is driven to generate power. The gaseous carbon dioxide, as it flows through the expander 430, impacts the blades, propelling the rotor to rotate, to achieve energy output.
An expander 430 is correspondingly connected to an energy releasing heat exchanger 420, and both can be regarded as expansion energy releasing parts. Preferably, a plurality of sets of expansion energy release portions connected in series may be provided between the evaporator 410 and the energy release cooler 440. As such, the blade manufacturing requirements for expander 430 are lower, and correspondingly, lower costs. Wherein the energy releasing heat exchanger in the expansion energy releasing part at the beginning is connected with the evaporator 410, the expander in the expansion energy releasing part at the end is connected with the energy releasing cooler 440, and the expander in each expansion energy releasing part is connected with the energy releasing heat exchanger in the adjacent expansion energy releasing part. The beginning and end are defined herein in the direction from the fluid reservoir 200 through the energy release member 400 to the gas reservoir 100. If there is only one set of expansion energy releasing parts, the beginning and the end are the only set of expansion energy releasing parts.
In some embodiments, the heat exchange assembly 500 includes a heat storage tank 510, a heat storage tank 520, and a heat exchange medium cooler 530, and a heat exchange medium is stored in the heat storage tank 520 and the heat storage tank 510. The temperature of the heat exchange medium in the heat-storage tank 510 is low, and the temperature of the heat exchange medium in the heat-storage tank 520 is high. The cold storage tank 510 and the hot storage tank 520 form a heat exchange loop between the energy storage assembly 300 and the energy release assembly 400. When the heat exchange medium flows in the heat exchange loop, the collection and the release of energy can be realized.
Specifically, when the heat exchange medium flows from the heat storage tank 510 to the heat storage tank 520, part of energy generated in the energy storage process is transferred to the heat exchange assembly 500 and stored in the heat storage tank 520, when the heat exchange medium flows from the heat storage tank 520 to the heat storage tank 510, the energy temporarily stored in the heat exchange assembly 500 in the energy storage process is released again, and when the heat exchange medium flows from the heat storage tank 520 to the heat storage tank 510, the heat exchange medium flows through the heat exchange medium cooler 530 to be cooled, so that the temperature requirement of the heat exchange medium stored in the heat storage tank 510 is met. The heat exchange medium can be molten salt or saturated water.
The driving assembly 900 includes an energy input 910, a first driving member 920, and a driving circulation cooler 930. The energy input member 910 is connected to an external heat source, and the energy input member 910 is connected to the energy storing second pipe 350 connected to the outlet of the compressor 310 through a driving cycle first pipe 940. The first driving member 920 is connected to the energy input member 910 through a second driving cycle pipe 950, the driving cycle cooler 930 is connected to the first driving member 920 through a third driving cycle pipe 960, and the energy storage first pipe 340 connected to the inlet of the compressor 310 is connected to the driving cycle cooler 930 through a fourth driving cycle pipe 970.
A portion of the carbon dioxide flowing from the compressor 310 flows to the energy storage heat exchanger 320 and a portion flows to the drive assembly 900. The first drive member 920 is a turbine, and carbon dioxide flowing through the rotor of the turbine impacts the blades to rotate the rotor, thereby driving the turbine shaft to rotate and driving the compressor 310 to operate.
In the above process, the input thermal energy is converted into mechanical energy to drive the compressor 310 to work, and then the compressor 310 compresses the carbon dioxide, so that the carbon dioxide is converted into pressure energy and the thermal energy generated during compression is stored.
Referring to fig. 1 and 2, fig. 2 is a schematic structural diagram of the first driving member, the second driving member and the compressor in fig. 1. The carbon dioxide flows through the driving assembly 900, and thus absorbs external heat to drive the compressor 310. Therefore, a second driving unit 980 is further provided, and when the apparatus is just started and no carbon dioxide flows through the driving assembly 900, the first driving unit 920 cannot drive the compressor 310, and the compressor 310 is driven by the second driving unit 980 for compression. When the compressor 310 starts to operate, the carbon dioxide pressurized by the compressor 310 flows to the driving assembly 900, and absorbs external heat energy through the energy input member 910 so that the first driving member 920 can drive the compressor 310 to keep operating, the second driving member 980 stops operating. The second drive member 980 may be a drive member such as a motor.
Preferably, the first and second drivers 920, 980 are coaxially arranged with the compressor 310, i.e. the output shafts of the first and second drivers 920, 980 are collinear. So, can balance axial thrust, reduce axial and radial vibration, make whole device operation more steady, vibration noise is also littleer.
Preferably, dry gas sealing is used at both the first driver 920 and the compressor 310.
In addition, each pipeline is provided with a circulating pump and other components for realizing the directional flow of the carbon dioxide and the heat exchange medium.
During energy storage, the first valve 610, the third valve 630 and the eighth valve 680 are opened, the second valve 620 and the fourth valve 640 are closed, and the second driving member 980 is started, so that the compressor 310 is driven to work by the second driving member 980. The gaseous carbon dioxide in the normal temperature and pressure state flows out of the gas storage 100 and flows to the compressor 310 through the energy storage first pipeline 340. The gaseous carbon dioxide is compressed by compressor 310, increasing its pressure. During compression, heat is generated, raising the temperature of the carbon dioxide. After the carbon dioxide is compressed by the compressor 310, a part of the carbon dioxide flows to the energy storage heat exchanger 320 through the energy storage second pipeline 350; another portion flows from the energy storage second conduit 350 into the drive cycle first conduit 940 and then to the energy input 910.
The carbon dioxide flowing to the energy input member 910 absorbs external heat energy through the energy input member 910, and the temperature thereof is further increased. The carbon dioxide in a high temperature and high pressure state flows to the first driver 920 through the driving circulation second pipe 950. The first driving member 920 is a turbine, and the carbon dioxide in the high temperature and high pressure state impacts the blades of the turbine to push the rotor to rotate, thereby driving the turbine shaft to rotate to drive the compressor 310 to work. The carbon dioxide flowing out of the first driving member 920 has a reduced temperature and pressure, but still has an excessively high temperature, and thus flows to the driving circulation cooler 930 through the third pipe 960 of the driving circulation, and is cooled by the driving circulation cooler 930, so that the temperature and pressure thereof are not much different from those of the carbon dioxide flowing into the compressor 310 through the gas storage 100. After the temperature of the driving cycle cooler 930 is reduced, the carbon dioxide is merged into the energy storage first pipeline 340 through the driving cycle fourth pipeline 970, and enters the compressor 310 again for compression.
The carbon dioxide flowing to the energy storage heat exchanger 320 transfers the heat generated during compression to the heat exchange assembly 500 to complete partial energy storage in the form of thermal energy. After heat exchange is realized, high-pressure gaseous carbon dioxide flows to the condenser 330 through the energy storage third pipeline 360, is condensed through the condenser 330, and is converted into liquid carbon dioxide. The liquid carbon dioxide flows into the liquid storage tank 200 through the energy storage fourth pipeline 370, and partial energy storage is completed in the form of pressure energy.
When the power is released, the second valve 620 and the fourth valve 640 are opened, and the first valve 610, the third valve 630 and the eighth valve 680 are closed. The high pressure liquid carbon dioxide flows out of the storage tank 200, flows to the evaporator 410 through the energy releasing first pipe 450, is evaporated by the evaporator 410, and is converted into a gaseous state. The gaseous carbon dioxide flows through the energy releasing second conduit 460 to the energy releasing heat exchanger 420. The heat stored in the heat exchange assembly 500 during the energy storage process is transferred to the carbon dioxide flowing through the energy releasing heat exchanger 420, and the carbon dioxide absorbs the heat and increases the temperature. The high-temperature gaseous carbon dioxide flows to the expander 430 through the energy releasing third pipeline 470, expands in the expander 430 and does work outwards, so that energy output is realized, and the generator 4200 is driven to generate power.
The pressure and temperature of the carbon dioxide after energy release are both reduced, but the temperature is still higher than the required storage temperature of the gas storage 100. Therefore, the carbon dioxide flowing out of the expander 430 flows into the energy release cooler 440 through the energy release fourth pipe 480, and is cooled by the energy release cooler 440, so that the temperature of the carbon dioxide can meet the requirement of the gas storage 100. The cooled carbon dioxide flows through the energy release fifth pipeline 490 to enter the gas storage 100, and the whole energy release flow is completed.
In the above process, the thermal energy stored in the heat exchange assembly 500 is converged into the high-pressure carbon dioxide, and the carbon dioxide is expanded in the expander 430, so that the pressure energy is released together with the thermal energy to be converted into mechanical energy.
In the energy storage and release processes, the first heat exchange medium circulating pump 580 is turned on during energy storage, the second heat exchange medium circulating pump 581 is turned on during energy release, and the heat exchange medium circularly flows between the cold storage tank 510 and the heat storage tank 520, so that temporary storage and release of energy are realized. Specifically, energy is temporarily stored in the heat exchange medium in the form of heat energy. In the energy storage process, the low-temperature heat exchange medium flows to the energy storage heat exchanger 320 through the first heat exchange pipeline 540 for heat exchange, and absorbs heat in the compressed high-temperature carbon dioxide, so that the temperature of the heat exchange medium is increased. The heated high-temperature heat exchange medium flows to the heat storage tank 520 through the heat exchange second pipe 550, and heat is temporarily stored in the heat storage tank 520. When energy release is started, the high-temperature heat exchange medium flows from the heat storage tank 520 to the energy release heat exchanger 420 through the heat exchange third pipeline 560 to exchange heat, and heat is transferred to the carbon dioxide flowing through the energy release heat exchanger 420, so that the temperature of the carbon dioxide is increased. After the heat exchange is completed, the temperature of the heat exchange medium is reduced, and the cooled heat exchange medium flows to the heat exchange medium cooler 530 through the heat exchange fourth pipe 570. Although the temperature of the heat exchange medium is lowered after the heat exchange, the temperature thereof is still higher than the temperature range required by the heat-storage tank 510. Therefore, when the heat exchange medium flows through the heat exchange medium cooler 530, the heat exchange medium is cooled again by the heat exchange medium cooler 530, so that the temperature of the heat exchange medium reaches the requirement of the heat storage tank 510.
In addition, in some embodiments, the first valve 610, the second valve 620, the third valve 630, the fourth valve 640, and the eighth valve 680 may all be opened, and energy storage and energy release may be performed simultaneously.
Preferably, in some embodiments, after the heat exchange medium is cooled by the heat exchange medium cooler 530, the released heat can be recycled for use in evaporation of carbon dioxide, so as to reduce energy waste and improve energy utilization.
Specifically, the heat exchange medium cooler 530 may be connected to the evaporator 410, and the heat released by the heat exchange medium cooler 530 when cooling the heat exchange medium is transferred to the evaporator 410 for use when evaporating carbon dioxide. The heat exchange medium cooler 530 and the evaporator 410 may be directly connected or indirectly connected through other components.
Of course, if the heat released when the heat exchange medium is cooled is evaporated only by using the heat exchange medium cooler 530, there may be a case where the heat is insufficient. Therefore, the heat can be supplemented by using an external heat source so that the evaporation process can be smoothly performed.
Preferably, the supplemental external heat source may be some waste heat, such as the heat evolved during cooling of a casting or forging in a foundry or forging plant, or the heat evolved during chemical reactions in some chemical plant. The waste heat is used as an external heat source, so that the energy waste can be reduced, additional heating is not needed, and the cost can be reduced.
In some embodiments, the heat generated by the condensation of the condenser 330 during the energy storage process can be recycled, and during the energy release process, the heat is supplied to the evaporator 410 for the evaporation of carbon dioxide, so as to reduce the energy waste and improve the energy utilization rate.
Specifically, the condenser 330 may be connected to the evaporator 410, and the heat released when the carbon dioxide is condensed may be collected and transferred to the evaporator 410 for use when the carbon dioxide is evaporated. The condenser 330 and the evaporator 410 may be directly connected or indirectly connected through other components.
Of course, if evaporation is performed using only the heat released from the condenser 330, there may be a case where the heat is insufficient. Therefore, the heat can be supplemented by using an external heat source so that the evaporation process can be smoothly performed.
Preferably, in some embodiments, a first energy releasing pipe 450 and a sixth energy releasing pipe 4500 are disposed between the evaporator 410 and the liquid storage tank 200, the second valve 620 is disposed on the first energy releasing pipe 450, and the throttle expansion valve 4100 and the ninth valve 6200 are disposed on the sixth energy releasing pipe 4500. When the second valve 620 is opened and the ninth valve 6200 is closed, the energy releasing first pipe 450 is conducted, and when the ninth valve 6200 is opened and the second valve 620 is closed, the energy releasing sixth pipe 4500 is conducted. In the energy releasing process, if the sixth energy releasing pipe 4500 is selectively conducted, the high-pressure liquid carbon dioxide flowing out of the liquid storage tank 200 is expanded and depressurized by the throttle expansion valve 4100, and then flows into the evaporator 410.
The throttle expansion valve 4100 is provided to lower the pressure in order to facilitate the transition of carbon dioxide from the liquid state to the gaseous state, as compared with the transition of carbon dioxide from the liquid state to the gaseous state only by raising the temperature.
Preferably, when the throttle expansion valve 4100 is used, the evaporator 410 and the condenser 330 may be combined into one unit to form a phase change heat exchanger. Among the phase change heat exchanger, including evaporation portion and condensation portion two parts, pass through the pipe connection between evaporation portion and the condensation portion, inside the phase change heat exchanger, the heat transfer to the evaporation portion that emits when condensing the condensation portion. By combining the evaporator 410 and the condenser 330 into one unit, the heat transfer is completed inside the phase change heat exchanger, so that the loss during the heat transfer can be reduced, and the energy utilization rate can be further improved. It should be noted that when energy storage and energy release are performed simultaneously, heat transfer can be achieved in the above manner, and if the energy storage and energy release cannot be performed simultaneously, the energy needs to be stored first and then supplied to the evaporator 410 for evaporation.
Referring to fig. 3, a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in another embodiment of the invention is shown. As described above, in the energy releasing process, the carbon dioxide flowing out of the expander 430 flows into the energy releasing cooler 440 through the energy releasing fourth pipe 480, and is cooled by the energy releasing cooler 440, so that the temperature of the carbon dioxide can meet the requirement of the gas storage 100. When the energy-releasing cooler 440 performs temperature reduction and heat exchange, heat is released. Preferably, in some embodiments, the part of heat can be recycled for use in carbon dioxide evaporation, so as to reduce energy waste and improve energy utilization rate.
Preferably, the heat released by the carbon dioxide condensation and the heat released by the energy release cooler 440 are supplied to the evaporator 410.
Specifically, the energy release cooler 440 and the condenser 330 may be connected to the evaporator 410, and the heat released by the energy release cooler 440 during temperature reduction and heat exchange and the heat released by the condenser 330 during condensation are transferred to the evaporator 410 for use during evaporation of carbon dioxide. The energy release cooler 440 may be directly connected to the evaporator 410 or indirectly connected to the evaporator through other components. The condenser 330 and the evaporator 410 may be directly connected or indirectly connected through other components.
For example, in fig. 3, heat transfer between the energy release chiller 440 and the evaporator 410 is accomplished via a water sump 710. A first recovery pipe 720 and a second recovery pipe 730 are provided between the water tank 710 and the energy-releasing cooler 440. A third recovery pipe 740 and a fourth recovery pipe 750 are provided between the water tank 710 and the evaporator 410. A fifth recovery conduit 760 and a sixth recovery conduit 770 are disposed between the water tank 710 and the condenser 330. The water tank 710 and the pipelines are provided with heat insulation materials for insulating the water therein.
The sixth valve 660 and the fifth valve 650 are opened, a part of the water in the water tank 710 flows to the condenser 330 through the fifth recovery pipe 760, absorbs the heat emitted from the condenser 330, and the water temperature rises and then flows to the water tank 710 through the sixth recovery pipe 770. Meanwhile, a part of the water in the water tank 710 flows to the energy release cooler 440 through the first recovery pipe 720, absorbs the heat released by the energy release cooler 440, and flows into the water tank 710 through the second recovery pipe 730 after the water temperature rises.
When the water is evaporated, the seventh valve 670 is opened, the water with higher temperature in the water tank 710 flows to the evaporator 410 through the third recovery pipeline 740, heat is provided for the evaporation of the carbon dioxide, the water temperature is reduced after flowing through the evaporator 410, and the cooled water flows to the water tank 710 through the fourth recovery pipeline 750.
In the above process, other substances than water for heat collection may be used.
In addition, the first recovery pipeline 720, the second recovery pipeline 730, the third recovery pipeline 740, the fourth recovery pipeline 750, the fifth recovery pipeline 760 and the sixth recovery pipeline 770 are further provided with a circulating pump and the like to circulate the water in the water tank 710.
The temperature of the water in the water reservoir 710 may increase as the heat released by the energy release cooler 440 and the condenser 330 is continuously transferred to the water reservoir 710. As the evaporator 410 continuously absorbs heat from the water reservoir 710, the temperature of the water in the water reservoir 710 may be continuously reduced. Therefore, it is preferable that the water tank 710 is in a constant temperature state.
Specifically, the water tank 710 is further connected with a thermostatic controller, a temperature sensor, a heater, a radiator and other components. The temperature sensor monitors the water temperature in the water tank 710 and transmits the water temperature to the thermostat controller, and if the water temperature is raised too much by releasing the heat emitted from the cooler 440 and the condenser 330 and exceeds a maximum set value, the thermostat controller controls the radiator to radiate heat to the water tank 710. If the water temperature is lowered too much below the minimum set point by the heat absorbed by the evaporator 410, the thermostat controls the heater to heat the water bath 710.
In some embodiments, the heat released from the condenser 330, the heat released from the energy release cooler 440, and the heat released from the heat exchange medium cooler 530 may be supplied to the evaporator 410. The specific arrangement is similar to the above embodiment, and is not described herein again. In fact, the heat in the three places can be supplied separately, or any two of the three places can be supplied together.
Of course, if the heat in the three locations is still insufficient after being supplied to the evaporator 410, an external heat source can be used to supplement the heat. Specifically, when the heat is supplemented using an external heat source, the heat may be directly supplemented to the evaporator 410. Alternatively, heat can also be added to the heat exchange medium of the heat exchange circuit.
When the heat is supplied to the evaporator 410, an external heat source may be directly connected to the evaporator 410.
Referring to fig. 4, a schematic structural diagram of a thermal energy-to-mechanical energy storage device based on carbon dioxide gas-liquid phase change in another embodiment of the invention is shown. When heat is supplemented to the heat exchange medium of the heat exchange loop, a heating pipeline 820 may be disposed between the heat storage tank 510 and the heat storage tank 520, an auxiliary heating element 810 is disposed on the heating pipeline 820, a part of the heat exchange medium flowing out of the heat storage tank 510 flows to the auxiliary heating element 810 through the heating pipeline 820, and the auxiliary heating element 810 heats the part of the heat exchange medium to absorb external heat, so that heat reaching the heat exchange medium cooler 530 may be increased, that is, heat provided to the evaporator 410 may be increased.
Preferably, the source of heat at the auxiliary heating member 810 may be external heat energy, for example, geothermal energy, solar photo-thermal energy, heat energy generated by burning biomass, burning garbage, waste heat generated in industrial production processes, and the like. The external heat source is used, so that energy waste can be reduced, additional heating is not needed, and the cost can be reduced.
Preferably, a plurality of groups of the energy storage assembly 300, the energy release assembly 400, the heat exchange assembly 500 and the driving assembly 900 may be disposed between the gas storage 100 and the liquid storage tank 200, each group being disposed as in the previous embodiments. When the device is used, if the components in one group are in failure, other groups can work, the failure outage rate of the device can be reduced, and the working reliability of the device can be improved.
Preferably, a plurality of driving assemblies 900 and a plurality of compressors 310 are provided, and each driving assembly 900 drives one compressor 310 correspondingly. A portion of the pressurized heat exchange medium flowing out of each compressor 310 can flow to the corresponding driving assembly 900, and the first driving member 920 in each driving assembly 900 can drive the corresponding compressor 310 to operate. In this way, each of the compressors 310 can be driven by external heat energy.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. Heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase transition, its characterized in that includes:
a gas reservoir for storing gaseous carbon dioxide, the volume of the gas reservoir being variable;
the liquid storage tank is used for storing liquid carbon dioxide;
the energy storage assembly is used for storing energy, the energy storage assembly is arranged between the gas storage and the liquid storage tank, carbon dioxide is converted from a gaseous state to a liquid state through the energy storage assembly, the energy storage assembly comprises a compressor, and the compressor is used for compressing the carbon dioxide;
the energy releasing component is used for releasing energy and arranged between the gas storage and the liquid storage tank, and carbon dioxide is converted from a liquid state to a gas state through the energy releasing component;
the energy storage assembly and the energy release assembly are both connected with the heat exchange assembly, and the heat exchange assembly can transfer part of energy generated in the energy storage assembly into the energy release assembly;
the driving assembly is connected with the energy storage assembly and comprises an energy input part and a first driving part, partial carbon dioxide flowing out of the compressor can be shunted to the driving assembly, and the carbon dioxide shunted to the driving assembly can be absorbed by the energy input part to absorb external heat energy and drive the first driving part to work, and the first driving part can drive the compressor to work.
2. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the driving assembly further comprises a second driving member, the second driving member can be connected with the compressor, and when the first driving member is not started, the second driving member can drive the compressor to work.
3. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the first driving piece and the second driving piece are arranged coaxially with the compressor.
4. The device for storing energy of mechanical energy converted from heat energy based on carbon dioxide gas-liquid phase change is characterized in that the compressors and the driving assemblies are respectively provided with a plurality of one-to-one correspondence, part of carbon dioxide flowing out of the compressors can be distributed to the corresponding driving assemblies, and the first driving member in each driving assembly can drive the corresponding compressor to work.
5. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change, wherein the driving assembly further comprises a driving circulation cooler, the energy input member is connected with the compressor, the first driving member is connected with the energy input member, the driving circulation cooler is connected with the first driving member, the compressor is connected with the driving circulation cooler, and the driving circulation cooler is used for cooling carbon dioxide flowing into the compressor from the first driving member.
6. The device for storing energy of mechanical energy converted from heat energy to heat energy based on carbon dioxide gas-liquid phase change is characterized in that the energy storage assembly comprises a condenser and a compression energy storage part, at least one group of compression energy storage parts is arranged in the compression energy storage part, the compression energy storage part comprises the compressor and an energy storage heat exchanger, the energy storage heat exchanger in each compression energy storage part is connected with the compressor, the energy storage heat exchanger in each compression energy storage part is connected with the adjacent compressor in the compression energy storage part, the compressor in the compression energy storage part at the beginning is connected with the gas storage, the energy storage heat exchanger in the compression energy storage part at the end is connected with the condenser, the liquid storage tank is connected with the condenser, the heat exchange assembly is connected with the energy storage heat exchanger, and the carbon dioxide flowing out of the compressor partially flows into the corresponding energy storage heat exchanger, part of the energy flows into the corresponding driving assembly, and the energy storage heat exchanger can transfer part of energy generated when the carbon dioxide is compressed by the compressor to the heat exchange assembly.
7. The device for storing energy of mechanical energy converted from heat energy to gas-liquid phase change based on carbon dioxide as claimed in claim 1, wherein the energy releasing component comprises an evaporator, an expansion energy releasing part and an energy releasing cooler, the expansion energy releasing part is provided with at least one group, the expansion energy releasing part comprises an energy releasing heat exchanger and an expander, the expander in each expansion energy releasing part is connected with the energy releasing heat exchanger in the adjacent expansion energy releasing part, the evaporator is connected with the liquid storage tank, the energy releasing heat exchanger in the expansion energy releasing part at the beginning end is connected with the evaporator, the expander in the expansion energy releasing part at the end is connected with the energy releasing cooler, the gas storage tank is connected with the energy releasing cooler, and the heat exchanging component is connected with the energy releasing heat exchanger, the carbon dioxide flowing through the energy release heat exchanger can absorb the energy temporarily stored in the heat exchange assembly.
8. The energy storage device for converting heat energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the heat exchange assembly comprises a cold storage tank and a heat storage tank, heat exchange media are arranged in the cold storage tank and the heat storage tank, a heat exchange loop is formed between the energy storage assembly and the energy release assembly by the cold storage tank and the heat storage tank, the heat exchange media can flow in the heat exchange loop, partial energy generated by the energy storage assembly can be stored when the heat exchange media flow from the cold storage tank to the heat storage tank, and the stored energy can be transferred to the energy release assembly when the heat exchange media flow from the heat storage tank to the cold storage tank.
9. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the energy release assembly comprises an evaporator, carbon dioxide is converted from liquid state to gaseous state through the evaporator, the heat exchange assembly further comprises a heat exchange medium cooler, the heat exchange medium cooler is used for cooling the heat exchange medium entering the cold storage tank, and the heat exchange medium cooler is connected with the evaporator.
10. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that an auxiliary heating element is arranged between the cold storage tank and the heat storage tank, and part of the heat exchange medium can flow into the heat storage tank after being heated by the auxiliary heating element.
11. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the energy release component comprises a throttle expansion valve and an evaporator, carbon dioxide is converted from liquid state to gas state through the evaporator, the throttle expansion valve is positioned between the liquid storage tank and the evaporator, and the throttle expansion valve is used for reducing pressure of carbon dioxide flowing out of the liquid storage tank;
the energy storage assembly comprises a condenser, carbon dioxide is converted from a gaseous state to a liquid state through the condenser, and the evaporator is connected with the condenser.
12. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the energy release assembly comprises an evaporator and an energy release cooler, carbon dioxide is converted from liquid to gas through the evaporator, the energy release cooler is used for cooling carbon dioxide entering the gas storage, and the energy release cooler is connected with the evaporator.
13. The energy storage device for converting thermal energy into mechanical energy based on carbon dioxide gas-liquid phase change is characterized in that the gas storage is a flexible gas membrane gas storage.
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| CN202110169183.XA CN112985142A (en) | 2021-02-07 | 2021-02-07 | Heat energy conversion mechanical energy storage device based on carbon dioxide gas-liquid phase change |
| PCT/CN2021/136346 WO2022166384A1 (en) | 2021-02-07 | 2021-12-08 | Carbon dioxide gas-liquid phase change-based energy storage apparatus capable of converting heat energy into mechanical energy |
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