CN110374838A - A kind of critical-cross carbon dioxide energy-storage system and method based on LNG cryogenic energy utilization - Google Patents
A kind of critical-cross carbon dioxide energy-storage system and method based on LNG cryogenic energy utilization Download PDFInfo
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- CN110374838A CN110374838A CN201910515663.XA CN201910515663A CN110374838A CN 110374838 A CN110374838 A CN 110374838A CN 201910515663 A CN201910515663 A CN 201910515663A CN 110374838 A CN110374838 A CN 110374838A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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Abstract
A kind of critical-cross carbon dioxide energy-storage system and method based on LNG cryogenic energy utilization of the present invention, the system comprises carbon dioxide recycle circuits；The carbon dioxide recycle circuit includes liquid carbon dioxide air accumulator, First Heat Exchanger, the second heat exchanger, compressor set, supercritical carbon dioxide storage tank and expansion unit；The outlet of liquid carbon dioxide storage tank connects supercritical carbon dioxide reservoir inlet with compressor set through First Heat Exchanger evaporation side；The entrance for exporting successively expanded unit, First Heat Exchanger condensation side and connecting liquid carbon dioxide air accumulator with the condensation side of the second heat exchanger of supercritical carbon dioxide storage tank；The evaporation side entrance of second heat exchanger connects LNG storage tank, and outlet connection user terminal forms LNG and utilizes circuit；Further the liquid carbon dioxide of First Heat Exchanger condensation side outflow is condensed as cold source by LNG；Compressor set connects the electrically driven (operated) motor of low ebb and carries out energy storage；Expansion unit, which is connect through generator with user, to carry out releasing energy.
Description
Technical field
The invention belongs to energy storage and energy use technology field, and in particular to a kind of Trans-critical cycle based on LNG cryogenic energy utilization
Carbon dioxide energy-storage system and method.
Background technique
With traditional fossil energy increasingly depleted and environmental problem it is increasingly significant, the utilization of renewable energy by
More and more attention.The intrinsic randomness of the renewable energy such as wind energy, solar energy and fluctuation are to renewable energy
Exploitation brings huge challenge, therefore we need to develop energy storage technology and effectively solve these problems.
The extensive energy storage technology for capableing of mature application in the world at present only has water-storage and compressed-air energy storage two
Kind, water-storage is limited by geographical location, need specific geological conditions and long-term enough water sources, and compressed air
Energy storage relies on steam turbine technology, the aftercombustion of fossil fuel and the cave of suitable storage.One is proposed in recent years across facing
Boundary's carbon dioxide energy-storage system, which has the characteristics that compressed-air energy storage and is not necessarily to combustion chamber, we are based on this expansion and grind
Study carefully.
In the prior art, there is also the following problem, generating efficiency and storages for critical-cross carbon dioxide energy storage technology
Energy density is not also high, there is a problem of that liquefaction is insufficient in liquid carbon dioxide storage tank in critical-cross carbon dioxide energy storage technology,
Largely LNG more than needed is unable to get reasonable utilization as high-quality cold source.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of Trans-critical cycle titanium dioxide based on LNG cryogenic energy utilization
Carbon energy-storage system and method, energy conservation and environmental protection, design rationally, make full use of energy, can reduce the scale of storage system, increase
The flexibility of adding system.
The present invention is to be achieved through the following technical solutions:
A kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization, including carbon dioxide recycle circuit；
The carbon dioxide recycle circuit include liquid carbon dioxide air accumulator, First Heat Exchanger, the second heat exchanger,
Compressor set, supercritical carbon dioxide storage tank and expansion unit；
The outlet of the liquid carbon dioxide storage tank connects overcritical dioxy with compressor set through First Heat Exchanger evaporation side
Change carbon reservoir inlet；
Successively expanded unit, First Heat Exchanger condensation side and second are changed for the outlet of the supercritical carbon dioxide storage tank
The entrance of the condensation side connection liquid carbon dioxide air accumulator of hot device；
The evaporation side entrance of second heat exchanger connects LNG storage tank, and outlet connection user terminal forms LNG and utilizes circuit；
Further the liquid carbon dioxide of First Heat Exchanger condensation side outflow is condensed as cold source by LNG；
The electrically driven (operated) motor of compressor set connection low ebb carries out energy storage；
The expansion unit connect with user through generator and carries out releasing energy.
Preferably, compressor set carries out trough-electricity energy storage using multi-stage compression mode, and expansion unit uses multiple expansion side
Formula, driven generator generate electricity.
It preferably, further include heat source and cold source circulation loop；The heat source and cold source circulation loop includes heat source storage
Tank, heat exchanger group and cold source storage tank；The heat exchanger group includes the compressed side heat exchanger being arranged between compressor and setting
Expansion side heat exchanger between expanding machine；
The sender property outlet of corresponding compressor, the working medium entrances connection first of primary compressor is arranged in compressed side heat exchanger
Heat exchanger evaporates side outlet, the outlet of the compressed side heat exchanger evaporation side connection previous stage compressor between compressor stage with it is next
The import of grade compressor, final compressor outlet are connected to supercritical carbon dioxide reservoir inlet and carry out energy stores；Each pressure
The condensation side outlet of contracting side heat exchanger is connected with heat source storage tank import, and condensation side entrance is connected with cold source outlet
It connects；
The working medium entrances of corresponding expanding machine are arranged in expansion side heat exchanger, and the connection of supercritical carbon dioxide outlet is just
The evaporation side entrance of grade expanding machine, the expander outlet of the expansion side heat exchanger evaporation side connection previous stage between expanding machine grade with
Next stage expander inlet, the condensation side working medium entrances of the sender property outlet connection First Heat Exchanger of final stage expanding machine；Each expansion
The condensation side entrance of side heat exchanger is connected with heat source outlet, and condensation side outlet is connected with cold source storage tank import.
Further, heat source tank temperature is maintained at 135~150 degrees Celsius, and it is Celsius that cold source tank temperature is maintained at -5~5
Degree.
Preferably, first throttle valve is set between liquid carbon dioxide storage tank and First Heat Exchanger；Supercritical carbon dioxide
Second throttle is set between storage tank and expansion unit.
Preferably, liquid carbon dioxide storage tank upper end connects recycle compressor entrance, the outlet connection the of recycle compressor
The second servo loop of the condensation side of two heat exchangers forms gaseous carbon dioxide liquefaction circuits；Using the LNG in LNG storage tank as cold
Source condenses liquid carbon dioxide；The liquid dioxy of the first circuit connection First Heat Exchanger condensation side outflow of condensation side
Change carbon.
A kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization, including,
Low ebb energy storage；Carbon dioxide after gasifying in First Heat Exchanger is compressed through compressor set, is in after overcompression
Supercriticality is stored in supercritical carbon dioxide storage tank；
Releasing can power；Supercritical carbon dioxide storage tank discharges working medium, and working medium expansion work in expanding machine drives power generation
Machine is customer power supply；Carbon dioxide after expansion is in gaseous state, and liquid titanium dioxide is stored in after heat exchanger liquefies
In carbon storage tank；Release when can power, using the LNG in LNG storage tank as cold source further to the outflow of First Heat Exchanger condensation side
Liquid carbon dioxide is condensed.
Preferably, when low ebb energy storage；Carbon dioxide after gasification is compressed through compressor set, by compressed side heat exchanger between grade
The heat of compression is absorbed, while compressed side heat exchanger is also connected with cold source outlet and heat source storage tank, using heat of compression heating come self cooling
The medium of source storage tank is simultaneously delivered in heat source storage tank, and the carbon dioxide of gasification is after multi-stage compression and cascade EDFA in super
Critical state is stored in supercritical carbon dioxide storage tank；
It releases when can power；Supercritical carbon dioxide storage tank discharges working medium, the expansion work in expanding machine, by expanding between grade
Side heat exchanger storage expansion cooling capacity, while expanding side heat exchanger and being also connected with cold source outlet and heat source storage tank, it is stored up using heat source
High-temperature medium in tank heats the carbon dioxide working medium for flowing through heat exchanger, medium after cooling enter cold source storage tank into
Row storage.
Further, heat source and cold source circulation loop use water or conduction oil for medium, carrying out grade to carbon dioxide working medium
Heating and cooling treatment.
Preferably, logical by gaseous carbon dioxide of the recycle compressor to total condensation non-in liquid carbon dioxide storage tank
Overcompression becomes liquid carbon dioxide and reenters liquid carbon dioxide storage tank, wherein utilizing LNG storage tank by the second heat exchanger
In LNG liquid carbon dioxide is condensed as cold source.
Compared with prior art, the invention has the following beneficial technical effects:
Present invention employs critical-cross carbon dioxide energy storage technologies, make cold source using LNG abundant, to exchange heat from first
The liquid carbon dioxide that device condensed further condenses, and reduces liquid carbon dioxide temperature and effectively reduces liquid carbon dioxide
Liquid carbon dioxide gasification in storage tank, improves generating efficiency, while user can be directly fed after LNG endothermic gasification
It uses.
Further, the present invention uses multi-stage compression mode, and the electric power in compression process is supplied by trough-electricity, solves
The high problem of electric cost of having determined；The present invention uses multiple expansion mode, and driven generator generates electricity, and utilizes trough-electricity
Energy storage, power generation when needing electricity consumption, can earn peak-trough electricity price difference, not only can solve the defect that cell is completely dependent on power grid, peak valley
Price difference between electricity is also extremely considerable.
Further, the present invention constructs heat source and cold source circulation loop, is equipped with compressed side heat exchanger between compressor stage,
The heat of compression is recycled, the dissipation of thermal energy is reduced.Compressed side heat exchanger storage heat concentrate on heat source, for heat into
Enter the working medium of expanding machine；It is equipped with expansion side heat exchanger in expanding machine unit, effectively stores the cooling capacity generated in expansion process,
The cooling capacity of expansion side heat exchanger storage concentrates on cold source, is used for compressor cascade EDFA, lifting system energy storage and release can efficiency.
Further, on liquid carbon dioxide storage tank top, with recycle compressor by uncooled gaseous carbon dioxide pressure
It is stored after contracting by being reentered in liquid carbon dioxide storage tank after heat exchanger.
Detailed description of the invention
Fig. 1 is the structural representation that the present invention is a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization
Figure.
In figure: 1, liquid carbon dioxide storage tank；2, first throttle valve；3, First Heat Exchanger；4, the first compressor；5,
Three heat exchangers；6, the second compressor；7, the 4th heat exchanger；8, third compressor；9, supercritical carbon dioxide storage tank；10, heat source
Storage tank；11, cold source storage tank；12, second throttle；13, the first expanding machine；14, the 5th heat exchanger；15, the second expanding machine；16,
6th heat exchanger；17, third expanding machine；18, the second heat exchanger；19, LNG storage tank；20, recycle compressor.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, and described is explanation of the invention
Rather than it limits.
A kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization of the present invention, including carbon dioxide recycle return
Road；
The carbon dioxide recycle circuit includes liquid carbon dioxide air accumulator 1, First Heat Exchanger 3, the second heat exchanger
18, compressor set, supercritical carbon dioxide storage tank 9 and expansion unit；
The outlet of the liquid carbon dioxide storage tank 1 connects overcritical two with compressor set through 3 evaporation side of First Heat Exchanger
9 entrance of carbonoxide storage tank；
The outlet of the supercritical carbon dioxide storage tank 9 successively expanded unit, 3 condensation side of First Heat Exchanger and second
The entrance of the condensation side connection liquid carbon dioxide air accumulator 1 of heat exchanger 18；The evaporation side entrance of second heat exchanger 18 connects
LNG storage tank 19, outlet connection user terminal, by LNG as cold source further to the liquid of 3 condensation side of First Heat Exchanger outflow
Carbon dioxide is condensed；
The electrically driven (operated) motor of compressor set connection low ebb carries out energy storage；
The expansion unit connect with user through generator and carries out releasing energy.
Wherein, heat-insulating material is set outside liquid carbon dioxide storage tank 1.
Compressor set carries out trough-electricity energy storage using multi-stage compression mode, and expansion unit uses multiple expansion mode, driving
Generator generates electricity.
It further include heat source and cold source circulation loop；The heat source and cold source circulation loop includes heat source storage tank 10, heat exchange
Device group and cold source storage tank 11；The heat exchanger group includes the compressed side heat exchanger being arranged between compressor and is arranged swollen
Expansion side heat exchanger between swollen machine；
The sender property outlet of corresponding compressor, the working medium entrances connection first of primary compressor is arranged in compressed side heat exchanger
Heat exchanger 3 evaporates side outlet, the outlet of the compressed side heat exchanger evaporation side connection previous stage compressor between compressor stage with it is next
The import of grade compressor, final compressor outlet are connected to 9 entrance of supercritical carbon dioxide storage tank and carry out energy stores；It is each
The condensation side outlet of compressed side heat exchanger is connected with 10 import of heat source storage tank, and condensation side entrance goes out with cold source storage tank 11
Mouth is connected；
The working medium entrances of corresponding expanding machine are arranged in expansion side heat exchanger, and the outlet of supercritical carbon dioxide storage tank 9 connection is just
The evaporation side entrance of grade expanding machine, the expander outlet of the expansion side heat exchanger evaporation side connection previous stage between expanding machine grade with
Next stage expander inlet, the condensation side working medium entrances of the sender property outlet connection First Heat Exchanger 3 of final stage expanding machine；It is each swollen
The condensation side entrance of swollen side heat exchanger with heat source storage tank 10 outlet is connected, condensation side outlet with 11 import of cold source storage tank
It is connected.
10 temperature of heat source storage tank is maintained at 135~150 degrees Celsius, and 11 temperature of cold source storage tank is maintained at -5~5 degrees Celsius,
Heat-insulating material is all provided with outside heat source storage tank 10 and cold source storage tank 11.
First throttle valve 2 is set between liquid carbon dioxide storage tank 1 and First Heat Exchanger 3；Supercritical carbon dioxide storage tank
Second throttle 12 is set between 9 and expansion unit.
A kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization, including,
Low ebb energy storage；Carbon dioxide after gasifying in First Heat Exchanger 3 is compressed through compressor set, after overcompression
In supercriticality, it is stored in supercritical carbon dioxide storage tank 9；
Releasing can power；Supercritical carbon dioxide storage tank 9 discharges working medium, and working medium expansion work in expanding machine drives power generation
Machine is customer power supply；Carbon dioxide after expansion is in gaseous state, is stored in liquid dioxy after the liquefaction of heat exchanger 3
Change in carbon storage tank 1.
When low ebb energy storage；Carbon dioxide after gasification is compressed through compressor set, is absorbed and is compressed by compressed side heat exchanger between grade
Heat, while compressed side heat exchanger is also connected with the outlet of cold source storage tank 11 and heat source storage tank 10, is stored up using heat of compression heating from cold source
The medium of tank 11 is simultaneously delivered in heat source storage tank 10, and the carbon dioxide of gasification is after multi-stage compression and cascade EDFA in super
Critical state is stored in supercritical carbon dioxide storage tank 9；
It releases when can power；Supercritical carbon dioxide storage tank 9 discharges working medium, the expansion work in expanding machine, by expanding between grade
Side heat exchanger storage expansion cooling capacity, while expanding side heat exchanger and being also connected with the outlet of cold source storage tank 11 and heat source storage tank 10, utilize heat
High-temperature medium in source storage tank 10 heats the carbon dioxide working medium for flowing through heat exchanger, and medium after cooling enters cold source
Storage tank 11 is stored.
It releases in energy power supply link, the second heat exchanger 18 is set between First Heat Exchanger 3 and liquid carbon dioxide storage tank 1.Benefit
Use the LNG in LNG storage tank 19 further cold to the liquid carbon dioxide progress of 3 condensation side of First Heat Exchanger outflow as cold source
It is solidifying.
1 upper end of liquid carbon dioxide storage tank connects recycle compressor 20, and being used for will be not complete in liquid carbon dioxide storage tank 1
The gaseous carbon dioxide condensed entirely reenters liquid carbon dioxide storage tank 1, circulation pressure by being collapsed into liquid carbon dioxide
The second servo loop of the condensation side of the second heat exchanger 18 of outlet connection of contracting machine 20, using the LNG in LNG storage tank 19 as cold source
Liquid carbon dioxide is condensed.The liquid titanium dioxide of the first circuit connection 3 condensation side of First Heat Exchanger outflow of condensation side
Carbon.
The present invention is a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization, makes full use of the energy, drop
Low electric power consumption cost, energy conservation and environmental protection.Specifically, as shown in Figure 1 comprising liquid carbon dioxide storage tank 1, supercritical carbon dioxide
Storage tank 9, heat exchanger group, compressor set, expansion unit, heat source storage tank 10, cold source storage tank 11, LNG storage tank 19；LNG mentions for system
It is connected after semen donors with user；Liquid carbon dioxide storage tank top connects a compressor for the gaseous carbon dioxide weight that do not liquefy in tank
New compression is sent back in tank again.
Wherein, liquid carbon dioxide storage tank 1 is by pipeline and First Heat Exchanger 3, so with primary compressor entrance phase
Even, before liquid carbon dioxide storage tank 1 is connected with First Heat Exchanger 3, first throttle valve 2 is first set.Compressor is multistage and logical
Shaft coupling connection motor is crossed, motor is driven using trough-electricity.The sender property outlet end of compressor is equipped with compressed side and changes
Hot device, the outlet of the compressed side heat exchanger connection previous stage compressor between grade and the import of next stage compressor.Compressed side simultaneously
Heat exchanger is both connected between cold source and heat source by pipeline.Final compressor connects supercritical carbon dioxide storage tank 9 and carries out energy
Amount storage.Supercritical carbon dioxide storage tank 9 is connected to primary expansion machine by pipeline, supercritical carbon dioxide storage tank 9 and just
Second throttle 12 is set between grade expansion side heat exchanger.
Expansion unit is similarly multistage and is releasing energy stage driven generator power generation by shaft coupling.The working medium of expanding machine
Arrival end is equipped with expansion side heat exchanger, and the expander outlet and next stage of the expansion side heat exchanger connection previous stage between grade are swollen
Swollen machine import, expansion side heat exchanger are both connected between heat source and cold source by pipeline, and final stage expanding machine passes through pipeline and cooling
Device is connected to First Heat Exchanger 3, cools down to working medium, then by the second heat exchanger 18 using the cooling capacity of LNG to working medium into one
Step cooling, and then be connected with liquid carbon dioxide storage tank 1, form carbon dioxide recycle circuit；Compressor set, expansion unit pair
The heat exchanger both ends in heat exchanger group answered are connected with heat source storage tank 18, cold source storage tank 19, form a circulation loop；Liquid
1 top of state carbon dioxide storage tank is connected with recycle compressor 20, using recycle compressor 20 will not liquefy gaseous carbon dioxide extract out
And compress, by returning to liquid carbon dioxide storage tank 1 after the cooling of the second heat exchanger 18.
By above-mentioned connection, circulation loop is formed between compressor set and expansion unit, working medium is carbon dioxide.Meanwhile
Each compressed side heat exchanger is connected with 10 import of heat source storage tank, is connected with the outlet of cold source storage tank 11；Each expansion side is changed
Hot device is connected with the outlet of heat source storage tank 10, is connected with 11 import of cold source storage tank.It is, compressed side is changed in compressor set
The expansion side heat exchanger import that hot device outlet is connected to heat source, and then is connected in expansion unit by pipeline；It expands in unit
Cold source is connected to by pipeline, and then is connected in compressor set the compressed side heat exchanger import of expansion side heat exchanger exit.
Heat source, heat exchanger group form a circulation loop between cold source, and circulation loop uses water or conduction oil for medium.Wherein, heat source
10 temperature of storage tank, which is maintained at 135~150 degrees Celsius, to be advisable, and 11 temperature of cold source storage tank, which is maintained at -5~5 degrees Celsius, to be advisable, heat source
Heat-insulating material is all provided with outside storage tank 10 and cold source storage tank 11 to guarantee its temperature.
Meanwhile in order to guarantee constant temperature in liquid carbon dioxide storage tank, liquid carbon dioxide is avoided to gasify as far as possible, liquid two
It also is provided with heat-insulating material outside carbonoxide storage tank 1, guarantees that temperature is constant.
To improve power pressure, compressor set wasted work is reduced, compression section uses multi-stage compression heat accumulating type cascade EDFA side
Formula, compressor set of the present invention is for 3 grades；To increase working medium acting ability, system effectiveness is improved, dilation is using multistage
Reheat in stage mode is expanded, the present invention expands unit for 3 grades.
Wherein, compressor set includes the first compressor 4, the second compressor 6 and third compressor 8；Expanding unit includes
First expanding machine 13, the second expanding machine 15 and third expanding machine 17；Heat exchanger group includes the third as compressed side heat exchanger
Heat exchanger 5, the 4th heat exchanger 7 and the 5th heat exchanger 14 and the 6th heat exchanger 16 as expansion side heat exchanger.
Liquid carbon dioxide storage tank 1 is connected to First Heat Exchanger 3 by first throttle valve 2, is depressured through first throttle valve 2,
The endothermic gasification in First Heat Exchanger 10, while cooling capacity being stored in First Heat Exchanger 3.First Heat Exchanger 3 is connected by pipeline
It is connected to 4 import of the first compressor, third heat exchanger 5 connects the outlet of the first compressor 4 and 6 import of the second compressor, the 4th heat exchange
Device 7 connects the outlet of the second compressor 6 and 8 import of third compressor.Compressor set is connected by shaft coupling, the first compressor 4 and electricity
Motivation is connected, and motor is energized by low ebb electric drive.
Energy storage and energy release method in the present invention: the carbon dioxide after gasification is compressed through compressor set, by third and fourth between grade
Heat exchanger 5,7 absorbs the heat of compression, while third and fourth heat exchanger 5,7 is also connected with the outlet of cold source storage tank 11 and heat source storage tank 10, benefit
The medium from cold source storage tank 11 is heated with the heat of compression and is delivered in heat source storage tank 10.The carbon dioxide of gasification passes through three-level
It is in a supercritical state after compression and cascade EDFA, it is stored in supercritical carbon dioxide storage tank 9.
When needing to power, supercritical carbon dioxide storage tank 9, which discharges working medium and is depressurized to by second throttle 12, releases energy
Pressure is connected by pipeline with 13 entrance of the first expanding machine, and the 5th heat exchanger 14 the first expanding machine 13 of connection exports and second is swollen
Swollen 15 import of machine, the 6th heat exchanger 16 connect the outlet of the second expanding machine 15 and 17 import of third expanding machine.Expansion unit passes through connection
Axis device is connected with generator, and releasing to be customer power supply by generator in the stage.Wherein, the five, the six heat exchangers 14,16 connect simultaneously
Connect the outlet of heat source storage tank 10 and 11 import of cold source storage tank.High-temperature medium in heat source storage tank 10 by the five, the six heat exchangers 14,
16 pairs of carbon dioxide working medium for flowing through heat exchanger heat, and medium after cooling enters cold source storage tank 11 and stored.Pass through
Aforesaid way, heat source storage tank 10, heat exchanger group and cold source storage tank 11 constitute a circulation loop, and circulation loop is using water or leads
Hot oil is medium, heating and cooling treatment carrying out grade to carbon dioxide working medium.
Utilization in the present invention to LNG cooling capacity: final stage expanding machine is connected by pipeline with 3 condensation side of First Heat Exchanger, right
Working medium carbon dioxide is cooled down.Enter the second heat exchanger 18 with pipeline connection again after the outflow of First Heat Exchanger 3, second changes
Hot device 18 is further fully cooled working medium carbon dioxide as cold source using rich LNG resource.
System of the present invention includes that carbon dioxide recycle circuit, LNG are returned using circuit and gaseous state co 2 liquefaction
Road；The carbon dioxide recycle circuit includes liquid carbon dioxide storage tank 1, First Heat Exchanger 3, compressor set, overcritical two
Carbonoxide storage tank 9 and expansion unit；The outlet of the liquid carbon dioxide storage tank 1 is sequentially connected through 3 evaporation side of First Heat Exchanger
9 entrance of compressor set and supercritical carbon dioxide storage tank；The outlet of the supercritical carbon dioxide storage tank 9 is through sequentially connected
Expansion unit and 3 condensation side of First Heat Exchanger and 18 condensation side of the second heat exchanger finally connect liquid carbon dioxide storage tank 1 and enter
Mouthful；The electrically driven (operated) motor of compressor set connection low ebb carries out energy storage；The expansion unit is through generator and uses
Family connection carries out releasing energy；The LNG includes the second heat exchanger 18 and LNG storage tank 19 using circuit, passes through 18 benefit of the second heat exchanger
With the cooling capacity of LNG storage tank 19 to carbon dioxide condensing；The gaseous carbon dioxide liquefaction circuits include the second heat exchanger 18 and follow
Ring compressor 20 is extracted the uncolled gaseous carbon dioxide on 1 top of liquid carbon dioxide storage tank out, in recycle compressor 20
Boil down to liquid and by the second heat exchanger 18 it is cooling after flow into liquid carbon dioxide storage tank 1.
Claims (10)
1. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization, which is characterized in that including carbon dioxide recycle
Circuit；
The carbon dioxide recycle circuit includes liquid carbon dioxide air accumulator (1), First Heat Exchanger (3), the second heat exchanger
(18), compressor set, supercritical carbon dioxide storage tank (9) and expansion unit；
The outlet of the liquid carbon dioxide storage tank (1) connects overcritical two with compressor set through First Heat Exchanger (3) evaporation side
Carbonoxide storage tank (9) entrance；
Successively expanded unit, First Heat Exchanger (3) condensation side and second are changed for the outlet of the supercritical carbon dioxide storage tank (9)
The entrance of condensation side connection liquid carbon dioxide air accumulator (1) of hot device (18)；
The evaporation side entrance of second heat exchanger (18) connects LNG storage tank (19), and outlet connection user terminal forms LNG and utilizes back
Road；Further the liquid carbon dioxide of First Heat Exchanger (3) condensation side outflow is condensed as cold source by LNG；
The electrically driven (operated) motor of compressor set connection low ebb carries out energy storage；
The expansion unit connect with user through generator and carries out releasing energy.
2. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization according to claim 1, feature exist
In compressor set carries out trough-electricity energy storage using multi-stage compression mode, and expansion unit uses multiple expansion mode, driven generator
It generates electricity.
3. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization according to claim 1, feature exist
In further including heat source and cold source circulation loop；The heat source and cold source circulation loop includes heat source storage tank (10), heat exchanger group
With cold source storage tank (11)；The heat exchanger group includes the compressed side heat exchanger being arranged between compressor and is arranged in expanding machine
Between expansion side heat exchanger；
The sender property outlet of corresponding compressor is arranged in compressed side heat exchanger, and the working medium entrances of primary compressor connect First Heat Exchanger
(3) side outlet is evaporated, the outlet and next stage pressure of the compressed side heat exchanger evaporation side connection previous stage compressor between compressor stage
The import of contracting machine, final compressor outlet are connected to supercritical carbon dioxide storage tank (9) entrance and carry out energy stores；Each compression
The condensation side outlet of side heat exchanger is connected with heat source storage tank (10) import, and condensation side entrance is exported with cold source storage tank (11)
It is connected；
The working medium entrances of corresponding expanding machine are arranged in expansion side heat exchanger, and supercritical carbon dioxide storage tank (9) outlet connection is primary
The evaporation side entrance of expanding machine, the expander outlet of the expansion side heat exchanger evaporation side connection previous stage between expanding machine grade with it is next
Grade expander inlet, the condensation side working medium entrances of sender property outlet connection First Heat Exchanger (3) of final stage expanding machine；Each expansion side
The condensation side entrance of heat exchanger with heat source storage tank (10) outlet is connected, condensation side outlet with cold source storage tank (11) import phase
Connection.
4. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization according to claim 3, feature exist
In heat source storage tank (10) temperature is maintained at 135~150 degrees Celsius, and cold source storage tank (11) temperature is maintained at -5~5 degrees Celsius.
5. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization according to claim 1, feature exist
In setting first throttle valve (2) between liquid carbon dioxide storage tank (1) and First Heat Exchanger (3)；Supercritical carbon dioxide storage tank
(9) second throttle (12) are set between expansion unit.
6. a kind of critical-cross carbon dioxide energy-storage system based on LNG cryogenic energy utilization according to claim 1, feature exist
In liquid carbon dioxide storage tank (1) upper end connects recycle compressor (20) entrance, the outlet connection second of recycle compressor (20)
The second servo loop of the condensation side of heat exchanger (18) forms gaseous carbon dioxide liquefaction circuits；Made using the LNG in LNG storage tank (19)
Liquid carbon dioxide is condensed for cold source；The liquid of the first circuit connection First Heat Exchanger (3) condensation side outflow of condensation side
State carbon dioxide.
7. a kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization, which is characterized in that including,
Low ebb energy storage；Carbon dioxide in First Heat Exchanger (3) after gasification is compressed through compressor set, in super after overcompression
Critical state is stored in supercritical carbon dioxide storage tank (9)；
Releasing can power；Supercritical carbon dioxide storage tank (9) discharges working medium, and working medium expansion work in expanding machine drives generator
For customer power supply；Carbon dioxide after expansion is in gaseous state, is stored in liquid titanium dioxide after heat exchanger (3) liquefaction
In carbon storage tank (1)；It releases when can power, it is further cold to First Heat Exchanger (3) using the LNG in LNG storage tank (19) as cold source
The liquid carbon dioxide of solidifying side outflow is condensed.
8. a kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization according to claim 7, feature exist
In,
When low ebb energy storage；Carbon dioxide after gasification is compressed through compressor set, absorbs the heat of compression by compressed side heat exchanger between grade, together
When compressed side heat exchanger be also connected with cold source storage tank (11) outlet and heat source storage tank (10), using the heat of compression heating come from cold source storage tank
(11) medium is simultaneously delivered in heat source storage tank (10), and the carbon dioxide of gasification is after multi-stage compression and cascade EDFA in super
Critical state is stored in supercritical carbon dioxide storage tank (9)；
It releases when can power；Supercritical carbon dioxide storage tank (9) discharges working medium, the expansion work in expanding machine, by expanding side between grade
Heat exchanger storage expansion cooling capacity, while expanding side heat exchanger and being also connected with cold source storage tank (11) outlet and heat source storage tank (10), it utilizes
High-temperature medium in heat source storage tank (10) heats the carbon dioxide working medium for flowing through heat exchanger, and medium after cooling enters cold
Source storage tank (11) is stored.
9. a kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization according to claim 8, feature exist
In heat source and cold source circulation loop use water or conduction oil for medium, at heating carbon dioxide working medium progress grade and is cooling
Reason.
10. a kind of critical-cross carbon dioxide energy storage method based on LNG cryogenic energy utilization according to claim 7, feature
It is, pressure is passed through by gaseous carbon dioxide of the recycle compressor (20) to non-total condensation in liquid carbon dioxide storage tank (1)
It shortens into and reenters liquid carbon dioxide storage tank (1) for liquid carbon dioxide, wherein being stored up by the second heat exchanger (18) using LNG
LNG in tank (19) condenses liquid carbon dioxide as cold source.
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