A kind of enclosed low temperature compressed air energy-storage system and method
Technical field
The present invention relates to electricity storage technology field, particularly a kind of enclosed low temperature compressed air energy-storage system and energy storage side
Method.
Background technology
In recent years, the peak-to-valley ratio of China's power load is continuously increased, the renewable energy power generation such as wind energy, luminous energy installation amount by
Step increase, adds the growth requirement of distributed energy so that the importance of power energy storage technology progressively shows.At present, electric power is stored up
Can technology include drawing water energy storage, compressed-air energy storage, batteries to store energy, flywheel energy storage, super capacitor etc., and compressed-air energy storage
Can be with energy storage analogy of drawing water in terms of capacity and construction cost so that it turns into one of competitive power energy storage technology.
But existing compressed-air energy-storage system is mostly open-cycle system, it must obtain storing working medium from environment, to environment
Dependence is stronger.
The content of the invention
In view of this, it is an object of the invention to provide a kind of enclosed low temperature compressed air energy-storage system and energy storage method.
To achieve the above object, the present invention provides a kind of enclosed low temperature compressed air energy-storage system, it is characterised in that including:
First Heat Exchanger unit, normal temperature air is exchanged heat in the First Heat Exchanger unit with low-temperature cold accumulation working medium,
Switch to the air after heat exchange after normal temperature air heat exchange, switch to normal temperature cold-storage working substance after the heat exchange of low-temperature cold accumulation working medium;
Calm the anger unit, the air inputted after the heat exchange, the air after output squeezing;
Normal temperature storage tank, is stored for inputting normal temperature cold-storage working substance, is additionally operable to the normal temperature cold-storage working substance output of storage;
High-pressure gas device, is stored for inputting the air after compression, is additionally operable to the compressed air stored by output;
Unit is expanded, the compressed air of storage is inputted, compressed air is swollen to expansion unit acting output in expansion unit
Air after swollen cooling;
Second heat exchanger unit, normal temperature storage tank output normal temperature cold-storage working substance in second heat exchanger unit with it is described
Air after expansion cooling is exchanged heat, and low-temperature cold accumulation working medium, the air after expansion cooling are switched to after the heat exchange of normal temperature cold-storage working substance
Switch to normal temperature air after heat exchange;
Low-temperature storage tank, is stored for inputting the low-temperature cold accumulation working medium, is additionally operable to export the low-temperature cold accumulation working medium
To First Heat Exchanger unit;And
Low pressure caisson, is stored for inputting the normal temperature air, is additionally operable to export the normal temperature air to institute
State First Heat Exchanger unit.
It is preferred that, energy-storage system also includes cryogenic pump, low-temperature cold accumulation working medium pump from low-temperature storage tank by the cryogenic pump
Go out, and enter the First Heat Exchanger unit;It is preferred that also include normal temperature pump, normal temperature cold-storage working substance is by the normal temperature pump from institute
State normal temperature storage storage tank to pump out, and enter second heat exchanger unit.
It is preferred that, the unit of calming the anger includes at least one low-pressure compressor and at least one high-pressure compressor, mutually string
Join or be integrated into overall multistage compressor, the air after each low-pressure compressor entrance input heat exchange exports low-pressure air;
Low-pressure air inputs high-pressure compressor again, the air after high-pressure compressor output squeezing.
It is preferred that, the unit of calming the anger also includes intergrade compressor, and the low-pressure air compresses through intergrade compressor
Afterwards, exchanged heat through First Heat Exchanger unit and low-temperature cold accumulation working medium, then input high-pressure compressor.
It is preferred that, the First Heat Exchanger unit and the second heat exchanger unit include two or more heat exchanger, compressor
Before compressor input air in group with heat exchanger exchange heat or expand unit in expanding machine delivery air after with heat exchange
Device is exchanged heat.
It is preferred that, the expansion unit includes at least one low-pressure expansion machine and at least one high pressure expansion machine, mutually string
Join or be integrated into overall multiple expansion engine, the compressed air of each high pressure expansion machine input storage exports primary expansion air;
Each low-pressure expansion machine inputs primary expansion air, exports final stage expanded air.
It is preferred that, the expansion unit also includes intergrade expanding machine, and the primary expansion air inputs the intergrade
Low-pressure expansion machine is inputted after expanding machine again.
It is preferred that, energy-storage system also includes generator, is connected, is driven when expansion unit is done work with described pair of expansion unit
Electrical power generators.
According to another aspect of the present invention, a kind of enclosed low temperature compressed air energy storage method is also provided, including:
In low power consumption or energy storage:
Normal temperature air and low-temperature cold accumulation working medium are exchanged heat in First Heat Exchanger unit, are converted into and are changed after normal temperature air heat exchange
Air after heat, normal temperature cold-storage working substance is converted into after the heat exchange of low-temperature cold accumulation working medium;
Motor driving calms the anger unit by the air after the air boil down to compression after heat exchange, and press-in high-pressure gas device is deposited
Storage;
Stored by using normal temperature storage tank input normal temperature cold-storage working substance;
In peak of power consumption or when releasing energy:
High-pressure gas device exports stored compressed air, and the interior acting of input expansion unit simultaneously drives electrical power generators,
Air after expansion unit output expansion cooling;
Normal temperature cold-storage working substance in normal temperature storage tank is injected in the second heat exchanger unit, changed with the air after expansion cooling
Heat, switchs to low-temperature cold accumulation working medium after the heat exchange of normal temperature cold-storage working substance, the air after expansion cooling switchs to normal temperature air after heat exchange;
Low-temperature cold accumulation working medium input low-temperature storage tank is stored, low-temperature storage tank is additionally operable in low power consumption or energy storage
The low-temperature cold accumulation working medium is inputted to First Heat Exchanger unit;
Normal temperature air input low pressure caisson is stored, low pressure caisson is additionally operable to export the normal temperature air
To the First Heat Exchanger unit.
It is preferred that, the part compressor or regulation rotating speed of gas compressor control compressor flow of unit of being calmed the anger by start-stop, from
And adjust energy storage capacity;And/or the expanding machine or regulation expanding machine rotating speed control expanding machine by start-stop demi-inflation unit are done
Function power, so as to adjust generating capacity.
By above-mentioned technical proposal, the beneficial effect that the present invention is realized is:
(1) using double closed cycle loops so that energy-storage system does not enter in thermal energy storage process and exoergic process with environment
Row working medium is exchanged, and heat exchange is only existed, so as to reduce compressed-air energy-storage system to environmental factor dependence;
(2) storage of high temperature heat source is not present in system, reduces system heat dissipation in storing process, improves system stored energy effect
Rate, and the cold energy of expander outlet is reclaimed, as the wasted work of the low-temperature receiver of the cascade EDFA of compressor, further reduction compressor,
So as to improve system effectiveness;
(3) compressed-air energy-storage system also has the energy storage cycle unrestricted, it is adaptable to various types of power supplys, to environment
Friendly the advantages of, with wide prospect of the application.
Brief description of the drawings
Fig. 1 is the structural representation of enclosed low temperature compressed air energy-storage system embodiment 1 of the invention;
Fig. 2 is the structural representation of enclosed low temperature compressed air energy-storage system embodiment 2 of the invention.
Embodiment
In the present invention, " low temperature " refers to the temperature less than normal temperature;" low-temperature storage tank " refers to for storing less than normal temperature
The tank arrangement of working medium;" cryogenic pump " refers to the pump less than the working medium of normal temperature for pumping.
According to present invention inventive concept generally, a kind of enclosed low temperature compressed air energy-storage system, including:First heat exchange
Device unit, normal temperature air is exchanged heat in the First Heat Exchanger unit with low-temperature cold accumulation working medium, is turned after normal temperature air heat exchange
For the air after heat exchange, switch to normal temperature cold-storage working substance after the heat exchange of low-temperature cold accumulation working medium;Calm the anger unit, the sky inputted after the heat exchange
Air after gas, output squeezing;Normal temperature storage tank, is stored for inputting normal temperature cold-storage working substance, is additionally operable to the normal temperature of storage
Cold-storage working substance is exported;High-pressure gas device, is stored for inputting the air after compression, is additionally operable to the compression stored by output
Air;Unit is expanded, the compressed air of storage is inputted, compressed air is in expansion unit to expansion unit acting output expansion drop
Air after temperature;Second heat exchanger unit, normal temperature storage tank output normal temperature cold-storage working substance in second heat exchanger unit with
Air after the expansion cooling is exchanged heat, and low-temperature cold accumulation working medium is switched to after the heat exchange of normal temperature cold-storage working substance, after expansion cooling
Air switchs to normal temperature air after heat exchange;Low-temperature storage tank, is stored for inputting the low-temperature cold accumulation working medium, is additionally operable to output
The low-temperature cold accumulation working medium is to First Heat Exchanger unit;And low pressure caisson, stored up for inputting the normal temperature air
Deposit, be additionally operable to export the normal temperature air to the First Heat Exchanger unit.
By using double loop closed circulation system, cold energy storage and compressed air storage are combined, reduction compression is empty
The heat dissipation of gas energy storage system and the dependence to environment.
The enclosed low temperature compressed air energy-storage system of the present invention, it is filled low pressure gas storage by unit of calming the anger in low power consumption
Put hollow air pressure and enter the storage of high-pressure gas device, the interior energy for converting electrical energy into air is stored, while will by cryogenic pump
Low-temperature cold accumulation working medium is used for cooling down every grade of compressor inlet air, reduces power input to compressor;In peak of power consumption, high-pressure gas device
Mesohigh air drives electrical power generators by expanding machine, while the normal temperature cold-storage working substance in normal temperature storage tank passes through heater between level
Air is heated to environment temperature there is provided the power output of the unit working medium of expanding machine, while reclaiming every grade of expander outlet sky
The cold energy of gas, the low-temperature receiver for compressor cascade EDFA in next thermal energy storage process.The present invention is using double closed cycle loops so that
Energy-storage system does not carry out working medium with environment in thermal energy storage process and exoergic process and exchanged, and heat exchange is only existed, so as to reduce
Compressed-air energy-storage system reclaims the cold energy of expander outlet air to environmental factor dependence, is used as the cascade EDFA of compressor
Low-temperature receiver, reduce compressor wasted work, so as to improve system effectiveness.Meanwhile, the compressed-air energy-storage system also has the energy storage cycle
It is unrestricted, it is adaptable to various types of power supplys, it is environmentally friendly.
Wherein, system can also include generator, be connected with described pair of expansion unit, expansion unit is driven hair when doing work
Electric power generation.
Wherein, system can also include cryogenic pump, and low-temperature cold accumulation working medium is pumped out by the cryogenic pump from low-temperature storage tank,
And enter the First Heat Exchanger unit.It is preferred that also include normal temperature pump, normal temperature cold-storage working substance is by the normal temperature pump from described
Normal temperature storage storage tank is pumped out, and enters second heat exchanger unit.
For cryogenic pump or normal temperature pump, preferably impeller pump or positive displacement pump.Described enclosed low temperature compressed air
Energy-storage system, its described impeller pump is axial-flow type, mixed-flow or centrifugal pump one or more combination therein;Volume
Formula pump, is gear pump, screw pump, lobe pump or sliding-vane pump one or more combination therein.
For unit of calming the anger, the unit of calming the anger includes at least one low-pressure compressor and at least one high-pressure compressor,
Overall multistage compressor is serially connected or is integrated into, the air after each low-pressure compressor entrance input heat exchange is exported low
Press air;Low-pressure air inputs high-pressure compressor again, the air after high-pressure compressor output squeezing.
It is preferred that, the unit of calming the anger also includes intergrade compressor, and the low-pressure air compresses through intergrade compressor
Afterwards, exchanged heat through First Heat Exchanger unit and low-temperature cold accumulation working medium, then input high-pressure compressor.
For First Heat Exchanger unit and the second heat exchanger unit, it is preferred that the First Heat Exchanger unit and second is changed
Hot device unit includes exchanging heat or swollen with heat exchanger before the compressor input air in two or more heat exchanger, unit of calming the anger
Exchanged heat after expanding machine delivery air in swollen unit with heat exchanger.
It is preferred that, can be plate-fin, bushing type, shell-and-tube, fin-tube type or jacket type for heat exchanger.
For expansion unit, the expansion unit includes at least one low-pressure expansion machine and at least one high pressure expansion machine,
Overall multiple expansion engine is serially connected or is integrated into, the compressed air of each high pressure expansion machine input storage, output is primary swollen
Swollen air;Each low-pressure expansion machine inputs primary expansion air, exports final stage expanded air.
It is preferred that, the expansion unit also includes intergrade expanding machine, and the primary expansion air inputs the intergrade
Low-pressure expansion machine is inputted after expanding machine again.
It is preferred that, for unit or the expansion unit of calming the anger, when more than for two-stage, be coaxial cascade or split axle simultaneously
Connection form;In parallel form, each split axle is moved with main drive shaft and is connected.Compressor or expanding machine, are piston type, axial-flow type, oblique flow
The one or more combination therein of formula, centrifugal, screw.
It is preferred that, the driving power supply of motor is conventional power plant trough-electricity, nuclear power, wind-powered electricity generation, solar power generation, water power or tide
Nighttide generating one or more combination therein.
For the high-pressure gas device, it is preferred that be cave or artificial pressure container.The low pressure caisson, it is excellent
Choosing is pressure vessel, its variable volume, and can carry out heat exchange with environment so that internal temperature is identical with environment temperature.
For normal temperature storage tank, it can be man-made vessel, heat exchange can be carried out with outside so that the cold-storage working substance temperature of storage
It is identical with environment temperature.It is interlayer vacuum-pumping structure, internal insulation structure or external thermal insulation structure for the low-temperature storage tank.
For the air, preferably also replace as carbon dioxide or nitrogen;It is oil, alcohol for the cold-storage working substance
One or two kinds of combinations of the class aqueous solution.
According to the same design of the present invention, a kind of enclosed low temperature compressed air energy storage method is also provided,
Including:
In low power consumption or energy storage:
Normal temperature air and low-temperature cold accumulation working medium are exchanged heat in First Heat Exchanger unit, are converted into and are changed after normal temperature air heat exchange
Air after heat, normal temperature cold-storage working substance is converted into after the heat exchange of low-temperature cold accumulation working medium;
Motor driving calms the anger unit by the air after the air boil down to compression after heat exchange, and press-in high-pressure gas device is deposited
Storage;
Stored by using normal temperature storage tank input normal temperature cold-storage working substance;
In peak of power consumption or when releasing energy:
High-pressure gas device exports stored compressed air, and the interior acting of input expansion unit simultaneously drives electrical power generators,
Air after expansion unit output expansion cooling;
By in normal temperature cold-storage working substance injection heat exchanger in normal temperature storage tank, exchanged heat with the air after expansion cooling, normal temperature
Switch to low-temperature cold accumulation working medium after cold-storage working substance heat exchange, the air after expansion cooling switchs to normal temperature air after heat exchange;
Low-temperature cold accumulation working medium input low-temperature storage tank is stored, low-temperature storage tank is additionally operable in low power consumption or energy storage
The low-temperature cold accumulation working medium is exported to First Heat Exchanger unit;
Normal temperature air input low pressure caisson is stored, low pressure caisson is additionally operable to export the normal temperature air
To the First Heat Exchanger unit.
It is preferred that, its described energy storage is enabled in electric power low ebb, renewable energy power generation redundancy;Release can peak of power consumption,
Electric power accident, renewable energy power generation are enabled when undesirable.
It is preferred that, the part compressor or regulation rotating speed of gas compressor control compressor flow of unit of being calmed the anger by start-stop, from
And adjust energy storage capacity;And/or the expanding machine or regulation expanding machine rotating speed control expanding machine by start-stop demi-inflation unit are done
Function power, so as to adjust generating capacity.
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.Following explanations referring to the drawings to embodiment of the present invention are intended to this hair
Bright present general inventive concept is explained, and is not construed as a kind of limitation to the present invention.
Embodiment 1:
Fig. 1 show the enclosed low temperature compressed air energy-storage system embodiment 1 of the present invention, and it is used between two stages of compression, level
Heated between cooling and double expansion, level.Wherein, reference has following meanings in Fig. 1:
Motor 1, low-pressure compressor 2, high-pressure compressor 6, high pressure expansion machine 14, low-pressure expansion machine 18, heat exchanger 4,16,
21st, 29, valve 8,12,23,27,33,40,44,51, pipeline 3,5,7,9,11,13,15,17,20,22,24,26,28,30,
32nd, 34,36,37,38,39,41,43,45,47,48,49,50,52, high-pressure gas device 10, low pressure caisson 25 generates electricity
Machine 19, normal temperature storage tank 31, low-temperature storage tank 42, cryogenic pump 46, normal temperature pump 35, cold-storage working substance and air.
The shared propeller shaft couplings of motor 1 and unit of calming the anger, the shared propeller shaft couplings of generator 19 and expansion unit.
Low-pressure compressor 2 is connected with heat exchanger 29 respectively through pipeline 30, low pressure caisson 25 through pipeline 26,28, valve 27;Low pressure
Compressor 2 interlinks with heat exchanger 4 respectively through pipeline 3, high-pressure compressor 6 through pipeline 5;High-pressure compressor 6 through pipeline 7,9 with and
Valve 8 is connected with high-pressure gas device 10;High pressure expansion machine 14 is through pipeline 11,13 and valve 12 and the phase of high-pressure gas device 10
Lead to;High pressure expansion machine 14 interlinks with heat exchanger 16 respectively through pipeline 15, low-pressure expansion machine 18 through pipeline 17;Low pressure gas storage is filled
25 are put through pipeline 20,22,24, valve 23, heat exchanger 21 with low-pressure expansion machine 18 to be connected;Cryogenic pump 46 is through pipeline 43,45, valve
Door 44 is connected with low-temperature storage tank 42;Heat exchanger 29 and heat exchanger 4 are connected through pipeline 47 and pipeline 49 with cryogenic pump 46 respectively;
Heat exchanger 29 and heat exchanger 4 are connected through pipeline 48 and pipeline 50 with valve 51 respectively;Valve 51 is passed through through pipeline 52, normal temperature pump 35
Pipeline 32,34, valve 33 are connected with normal temperature storage tank 31 respectively;Heat exchanger 16 and heat exchanger 21 are respectively through pipeline 36 and pipeline 38
It is connected with normal temperature pump 35;Hot device 16 and heat exchanger 21 are connected through pipeline 37 and pipeline 39 with valve 40 respectively;Valve 40 is passed through
Pipeline 41 is connected with low-temperature storage tank 42.
During energy storage, valve 8,27,44,51 is opened, valve 12,23,33,40 is closed, motor 1 utilizes trough-electricity band dynamic pressure
Normal temperature air in mechanism of qi group, low pressure energy storage device enters heat exchanger 29 by pipeline 26,28, valve 27, while low-temperature storage tank
Low-temperature cold accumulation working medium enters the cooling normal temperature air of heat exchanger 29 through pipeline 43,45,47, valve 44, cryogenic pump 46 in 42, air
Enter low-pressure compressor 2 after temperature reduction and compress increasing temperature and pressure, the air after compression continues low through pipeline 3 into heat exchanger 4
Warm cold-storage working substance cooling, the air after cooling enters high-pressure compressor 6 through pipeline 5 to be continued to compress and increasing temperature and pressure, and it exports empty
Gas enters high-pressure gas device 10 through valve 8 and pipeline 7,9 and stored, while into the low-temperature cold accumulation in heat exchanger 29, heat exchanger 4
While working medium cooling air, after low-temperature cold accumulation working medium is heated by the air, enters normal temperature storage tank 31 through valve 51, pipeline 52 and carry out
Storage, energy storage terminates, and closes valve 8,27,44,51.Release can when, close valve 8,27,44,51, open valve 12,23,33,
40, pressure-air in high-pressure gas device 10, which enters high pressure expansion machine 14 through pipeline 11,13 and valve 12 and expanded, to cool, and it goes out
The normal temperature cold-storage working substance that mouthful air enters in heat exchanger 16, normal temperature storage tank 31 through pipeline 15 is through pipeline 32,34,36, valve 33, often
Warm pump 35 enters heat exchanger 16 and heats air, and after heat exchanger 16, normal temperature cold-storage working substance is cold by high pressure expansion machine outlet air
But to low temperature, air is heated to environment temperature, enters the continuation expansion work of low-pressure expansion machine 18 through pipeline 17 and drives generating
Machine 19 generates electricity, and the air that low-pressure expansion machine 18 is exported is heated to environment temperature by normal temperature cold-storage working substance again and filled into low pressure gas storage
Stored in putting 25, the cold-storage working substance after the cooling of heat exchanger 16,21 enters through valve 40, pipeline 41 into low-temperature storage tank 42
Row storage.Releasing to terminate, and valve 12,23,33,40 is closed.
Generally, carried out when energy storage is different with exoergic process, during energy storage, valve 8,27,44,51 is opened simultaneously, valve
Door 12,23,33,40 is closed, and the aperture of valve 27,44 is by unit flow control of calming the anger.When releasing energy, valve 12,23,33,40 is same
When open, valve 8,27,44,51 is closed, and the aperture of valve 12,33 is controlled by expansion unit flow.
Embodiment 2:
Fig. 2 show the enclosed low temperature compressed air energy-storage system embodiment 2 of the present invention, its agent structure and embodiment 1
It is identical, but it is using between the two stages of compression in heating replacement embodiment 1 between three stage compression, cascade EDFA and three-level expansion, level, level
Heated between cooling and double expansion, level.Wherein, reference has following meanings in Fig. 2:
Motor 1, low-pressure compressor 55, intermediate pressure compressor 59, high-pressure compressor 63, high pressure expansion machine 64, middle compression swelling
Machine 68, low-pressure expansion machine 72, heat exchanger 53,57,61,66,70,74, high-pressure gas device 10, low pressure caisson 25, normal temperature
Storage tank 31, low-temperature storage tank 42, cryogenic pump 46, normal temperature pump 35, valve 8,12,23,27,33,40,44,51, pipeline 26,28,54,
56、58、60、62、7、9、11、13、65、67、69、71、73、22、24、43、45、81、82、83、84、85、86、52、32、34、
75th, 76,77,78,79,80,41, generator 19, cold-storage working substance and air.
The connection of each part is substantially the same manner as Example 1.
During energy storage, valve 8,27,44,51 is opened, air in valve 12,23,33,40, low pressure caisson 25 is closed and passes through
Cross heat exchanger 53, low-pressure compressor 55, heat exchanger 57, intermediate pressure compressor 59, heat exchanger 61, high-pressure compressor 63, valve 8,27
And pipeline 26,28,54,56,58,60,62,7,9 enters high-pressure gas device 10 and stored, meanwhile, in low-temperature storage tank 42
Low-temperature cold accumulation working medium, which also enters in heat exchanger 53,57,61, cools down every grade of compressor inlet air, and low-temperature cold accumulation working medium is added by air
Enter after heat in normal temperature storage tank 31 and store, energy storage terminates, close valve 8,27,44,51.Release can when, close valve 8,27,44,
51, valve 12,23,33,40 is opened, pressure-air enters the expansion work of high pressure expansion machine 64 by valve 12 and pipeline 11,13,
Then heated, then done work by pipeline 67 into middle-pressure expansion machine 68 into heat exchanger 66 by pipeline 65, then through pipeline 69
Heated into heat exchanger 70, the air after heating does work through pipeline 71 into low-pressure expansion machine 72, while in normal temperature storage tank 31
Cold-storage working substance is entered after every grade of expander outlet air cooling to be stored in low-temperature storage tank 42, is released after terminating, shutoff valve
Door 12,23,33,40.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, it should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc. should be included in the protection of the present invention
Within the scope of.