CN113062848A - Combined type heat storage compressed air energy storage system and method - Google Patents

Combined type heat storage compressed air energy storage system and method Download PDF

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Publication number
CN113062848A
CN113062848A CN202110420465.2A CN202110420465A CN113062848A CN 113062848 A CN113062848 A CN 113062848A CN 202110420465 A CN202110420465 A CN 202110420465A CN 113062848 A CN113062848 A CN 113062848A
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China
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heat
loop
storage
temperature
liquid
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CN202110420465.2A
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Chinese (zh)
Inventor
谢宁宁
孙长平
尹立坤
蔺新星
张翼
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China Three Gorges Corp
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China Three Gorges Corp
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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
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/04—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly
    • F02C1/05—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly characterised by the type or source of heat, e.g. using nuclear or solar energy
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Abstract

The energy storage method of the combined heat storage compressed air energy storage system comprises a filling heat storage device, a heat storage loop, a heat release loop, an air storage loop, an auxiliary loop, a compression loop and an acting loop, wherein the filling heat storage device is communicated with the heat storage loop and the heat release loop through the heat storage loop and the heat release loop, the filling heat storage device is communicated with the heat storage loop and the heat release loop, a heat storage heat exchanger of the heat storage loop and a heat release heat exchanger of the heat release loop are both connected with the air storage loop, the auxiliary loop is connected with the heat release loop, and the compression loop and the acting loop are respectively connected with the heat storage heat exchanger and the. The invention overcomes the problems of low system conversion efficiency and unstable terminal output power caused by the fact that a heat release loop in the original system cannot meet the rated work requirement. The auxiliary loop heats the heat release loop when the temperature released by the liquid heat transfer medium in the heat release loop cannot meet the requirement of rated working temperature, so that the system conversion efficiency is improved, and the terminal output power is kept stable.

Description

Combined type heat storage compressed air energy storage system and method
Technical Field
The invention belongs to the technical field of energy storage, and relates to a combined type heat storage compressed air energy storage system and method.
Background
The compressed air energy storage technology can be divided into two types of complementary combustion type and non-complementary combustion type at present, although a compact heat storage system is proposed in patent CN105370408A, the heat storage range of a heat storage subsystem is low, water is adopted as a heat transfer medium and a heat storage medium, the investment cost can be reduced, but because the heat storage temperature and the heat release temperature are not high, the heat transferred to the air entering a turbine in the energy release process is low, and the overall efficiency of thermoelectric conversion needs to be improved. Patent CN105370408 adopts a high temperature heat storage subsystem, which can increase the temperature of the air entering the turbine to a higher temperature during the energy release process, thereby increasing the thermoelectric conversion efficiency of the system. However, in the foregoing technical solution, in the heat exchange process, when the heat storage temperature of the heat storage loop does not reach the work-doing set temperature, the temperature released by the heat release loop cannot meet the requirement of the rated work-doing temperature, and the system conversion efficiency is reduced, which results in unstable output power of the terminal.
Disclosure of Invention
The invention aims to solve the technical problem of providing a combined heat storage compressed air energy storage system and a method, which have simple structure, adopt the mutual communication of a heat storage loop and a heat release loop, fill a heat storage device to be communicated with the heat storage loop and the heat release loop, a heat storage heat exchanger of the heat storage loop and a heat release heat exchanger of the heat release loop are both connected with an air storage loop, an auxiliary loop is connected with the heat release loop, a compression loop and a working loop are respectively connected with the heat storage heat exchanger and the heat release heat exchanger, and when the temperature released by a liquid heat transfer medium in the heat release loop cannot meet the requirement of rated working temperature, the auxiliary loop heats the heat release loop, thereby improving the conversion efficiency of the system and keeping the output power of a terminal stable.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a combined heat storage compressed air energy storage system comprises a filling heat storage device, a heat storage loop, a heat release loop, a gas storage loop, an auxiliary loop, a compression loop and a work application loop; the heat storage loop and the heat release loop are communicated with each other, the filling heat storage device is positioned between the heat storage loop and the heat release loop and is communicated with the heat storage loop and the heat release loop, the heat storage heat exchanger of the heat storage loop and the heat release heat exchanger of the heat release loop are both connected with the gas storage loop, and the auxiliary loop is connected with the heat release loop; the compression loop and the work applying loop are respectively connected with the heat storage heat exchanger and the heat release heat exchanger.
The filling heat storage device comprises a liquid storage tank communicated with the liquid discharge end of the filling bed, one end of the heat storage loop and one end of the heat release loop are communicated with the liquid storage tank, and the other end of the heat storage loop and the other end of the heat release loop are communicated with the liquid inlet end of the filling bed.
The heat storage loop comprises a heat storage heat exchanger and a low-temperature shielding pump which are connected with the heat storage pipeline in series.
The heat release loop comprises a heat release heat exchanger and a high-temperature shielding pump which are connected in series with the heat release pipeline.
The gas storage loop comprises an air inlet pipeline and an air outlet pipeline which are connected with the gas storage tank, and the air inlet pipeline and the air outlet pipeline are respectively connected with the heat storage heat exchanger and the heat release heat exchanger.
The auxiliary loop comprises a heater connected with the heating pipeline in series and a branch pipeline connected with the heating pipeline, two ends of the heating pipeline are respectively connected with the liquid storage tank and the heat release loop, and the branch pipeline is connected with the heat release loop.
The compression loop comprises a compressor connected with a compression pipeline, and the compression pipeline is connected with the heat storage heat exchanger.
The working loop comprises an expansion machine connected with a working pipeline, and the working pipeline is connected with the heat release loop.
The liquid inlet end of a packed bed of the packed heat storage device is connected with a pressure stabilizing system; an expansion tank is connected in the heat release loop.
The energy storage and release method of the combined type heat storage compressed air energy storage system comprises the following steps:
s1, storing energy, starting the compressor and the low-temperature shielding pump, converting high-temperature and high-pressure air into low-temperature and high-pressure air, and storing the low-temperature and high-pressure air in the air storage tank;
s1-1, enabling high-temperature and high-pressure air discharged by the compressor to enter a heat storage heat exchanger, and enabling the heat storage heat exchanger to perform heat conversion with a low-temperature liquid heat transfer medium in a heat storage loop after absorbing heat;
s1-2, enabling the liquid heat transfer medium in the liquid storage tank to enter a heat storage loop, driving the liquid heat transfer medium in the heat storage loop to continuously circulate by the low-temperature shielding pump, and continuously absorbing heat of the heat storage heat exchanger by the liquid heat transfer medium; meanwhile, the high-temperature and high-pressure air is cooled to form low-temperature and high-pressure air which enters the air storage tank for storage;
s1-3, when the liquid heat transfer medium in the liquid storage tank reaches a set temperature value or the low-temperature high-pressure air in the air storage tank reaches a set value, ending the energy storage process;
s2, releasing energy, starting the high-temperature shielding pump, converting low-temperature high-pressure air in the air storage tank into high-temperature high-pressure air, and conveying the high-temperature high-pressure air to the expansion machine to do work;
s2-1, enabling low-temperature high-pressure air in the air storage tank to enter a heat release heat exchanger, and performing heat conversion with the low-temperature high-pressure air in the air storage loop after the heat release heat exchanger absorbs heat;
s2-2, enabling liquid heat transfer media in the liquid storage tank to enter a heat release loop, driving the liquid heat transfer media in the heat release loop to continuously circulate by a high-temperature shielding pump, and continuously conducting the heat of the liquid heat transfer media to a heat release heat exchanger; meanwhile, the low-temperature high-pressure air absorbs heat to form high-temperature high-pressure air to drive the expander to do work;
s2-3, when the low-temperature high-pressure air in the air storage tank is released to reach a set value or the temperature of the liquid heat transfer medium in the liquid storage tank reaches a set value, ending the energy release process;
s3, auxiliary heating, wherein in S2, when the temperature released by the liquid heat transfer medium in the heat release loop cannot meet the requirement of the rated working temperature of the expander, the heater is started to heat the liquid heat transfer medium in the heat release loop;
in S1, the heat release loop is in a closed state, the exhaust pipeline of the air storage tank is closed, and the air inlet pipeline is opened;
in S2, the heat storage circuit is closed, the exhaust line of the air tank is open, and the intake line is closed;
in S3, the liquid heat transfer medium does not pass through the packed bed.
The energy storage method of the combined heat storage compressed air energy storage system comprises a filling heat storage device, a heat storage loop, a heat release loop, an air storage loop, an auxiliary loop, a compression loop and an acting loop, wherein the filling heat storage device is communicated with the heat storage loop and the heat release loop through the heat storage loop and the heat release loop, the filling heat storage device is communicated with the heat storage loop and the heat release loop, a heat storage heat exchanger of the heat storage loop and a heat release heat exchanger of the heat release loop are both connected with the air storage loop, the auxiliary loop is connected with the heat release loop, and the compression loop and the acting loop are respectively connected with the heat storage heat exchanger and the. The invention overcomes the problems of low system conversion efficiency and unstable terminal output power caused by the fact that a heat release loop in the original system cannot meet the rated work requirement. The auxiliary loop heats the heat release loop when the temperature released by the liquid heat transfer medium in the heat release loop cannot meet the requirement of rated working temperature, so that the system conversion efficiency is improved, and the terminal output power is kept stable.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the filled thermal storage device of the present invention.
Fig. 3 is a schematic structural diagram of the heat storage circuit of the present invention.
FIG. 4 is a schematic diagram of the heat release circuit of the present invention.
FIG. 5 is a schematic diagram of an auxiliary circuit according to the present invention.
Fig. 6 is another schematic structure of the present invention.
Fig. 7 is another schematic structure of the present invention.
In the figure: the system comprises a filling heat storage device 1, a filling bed 11, a liquid storage tank 12, a pressure stabilizing system 13, a heat storage loop 2, a heat storage heat exchanger 21, a low-temperature shielding pump 22, a heat release loop 3, a heat release heat exchanger 31, a high-temperature shielding pump 32, an expansion tank 33, a gas storage loop 4, a gas storage tank 41, an auxiliary loop 5, a heater 51, a branch pipeline 52, a compression loop 6, a compressor 61, a work applying loop 7 and an expansion machine 71.
Detailed Description
As shown in fig. 1 to 7, a combined heat storage compressed air energy storage system includes a filling heat storage device 1, a heat storage loop 2, a heat release loop 3, an air storage loop 4, an auxiliary loop 5, a compression loop 6 and a work applying loop 7; the heat storage loop 2 and the heat release loop 3 are communicated with each other, the filling heat storage device 1 is positioned between the heat storage loop 2 and the heat release loop 3 and is communicated with the heat storage loop 2, the heat storage heat exchanger 21 of the heat storage loop 2 and the heat release heat exchanger 31 of the heat release loop 3 are connected with the gas storage loop 4, and the auxiliary loop 5 is connected with the heat release loop 3; the compression circuit 6 and the work circuit 7 are connected to the heat storage heat exchanger 21 and the heat release heat exchanger 31, respectively. When the temperature released by the liquid heat transfer medium in the heat release loop 3 cannot meet the requirement of the rated working temperature, the auxiliary loop 5 heats the heat release loop 3, so that the system conversion efficiency is improved, and the terminal output power is kept stable.
In a preferable scheme, the filling heat storage device 1 comprises a liquid storage tank 12 communicated with a liquid discharge end of a filling bed 11, one end of the heat storage loop 2 and one end of the heat release loop 3 are communicated with the liquid storage tank 12, and the other end of the heat storage loop is communicated with a liquid inlet end of the filling bed 11. The structure is simple, when in use, the packed bed 11 is used for absorbing the heat of the liquid heat transfer medium, and the liquid storage tank 12 is used for storing the liquid heat transfer medium discharged from the packed bed 11.
Preferably, the filler in the packed bed 11 is a solid heat storage material.
Preferably, the liquid heat transfer medium is a thermal oil.
Preferably, the packed bed 11 is a split flow packed bed or a trickle packed bed.
In a preferred embodiment, the thermal storage circuit 2 comprises a thermal storage heat exchanger 21 and a cryogenic shield pump 22 connected in series with the thermal storage line. The structure is simple, when the heat release loop 3 is closed, the liquid heat transfer medium is discharged from the liquid storage tank 12 and enters the heat storage loop 2, the low-temperature shielding pump 22 drives the liquid heat transfer medium in the heat storage pipeline to circularly flow, the heat of the liquid heat transfer medium is taken away when the liquid heat transfer medium flows through the heat storage heat exchanger 21, the temperature of the liquid heat transfer medium is gradually increased, and meanwhile, the heat storage heat exchanger 21 converts high-temperature and high-pressure air into low-temperature and high-pressure air.
Preferably, the number of the heat storage heat exchangers 21 is two or more, respectively, in parallel with the heat storage circuit 2.
In a preferred scheme, the heat release loop 3 comprises a heat release heat exchanger 31 and a high-temperature shielding pump 32 which are connected with a heat release pipeline in series. The structure is simple, when the heat storage loop 2 is closed, the liquid heat transfer medium is discharged from the liquid storage tank 12 and enters the heat release loop 3, the high-temperature shielding pump 32 drives the liquid heat transfer medium in the heat release pipeline to circularly flow, the heat in the liquid heat transfer medium is absorbed by the heat release heat exchanger 31 when the liquid heat transfer medium flows through the heat release heat exchanger 31, the temperature of the heat release heat exchanger 31 is gradually increased, and meanwhile, the heat release heat exchanger 31 converts low-temperature high-pressure air into high-temperature high-pressure air.
Preferably, the number of the heat release heat exchangers 31 is two or more, respectively connected in parallel with the heat release circuit 3.
In a preferred scheme, the gas storage loop 4 comprises an air inlet pipeline and an air outlet pipeline which are connected with the gas storage tank 41, and the air inlet pipeline and the air outlet pipeline are respectively connected with the heat storage heat exchanger 21 and the heat release heat exchanger 31. The structure is simple, when in use, in the heat storage stage, the air storage tank 41 receives and stores low-temperature high-pressure air discharged by the heat storage heat exchanger 21, and in the energy release stage, the air storage tank 41 discharges and conveys the low-temperature high-pressure air to the heat release heat exchanger 31.
Preferably, the number of the air storage tanks 41 is multiple, and the air storage tanks are connected in parallel and then communicated with the air inlet pipeline and the exhaust pipeline.
In a preferred embodiment, the auxiliary circuit 5 includes a heater 51 connected in series with the heating pipeline, and a branch pipeline 52 connected to the heating pipeline, wherein two ends of the heating pipeline are respectively connected to the liquid storage tank 12 and the heat release circuit 3, and the branch pipeline 52 is connected to the heat release circuit 3. The structure is simple, when the temperature released by the liquid heat transfer medium in the heat release loop 3 is too low to meet the rated working temperature requirement, the auxiliary loop 5 is started, and the heater 51 heats the liquid heat transfer medium in the heat release loop 3.
Preferably, during the heating process of the heater 51, the liquid heat transfer medium is discharged from the receiver 12 and enters the heater 51 along the high temperature shield pump 32, and then flows through the heat release heat exchanger 31 from the branch pipe 52 after being heated, and then flows into the receiver 12 through the heat release pipe to form a circulation loop.
Preferably, the liquid heat transfer medium does not flow through the packed bed 11 during warming of the heater 51.
In a preferred embodiment, the compression circuit 6 comprises a compressor 61 connected to a compression line, which is connected to the regenerative heat exchanger 21. The structure is simple, and when the heat storage heat exchanger is used, the compressor 61 does work to convert normal-temperature air into high-temperature high-pressure air and then conveys the high-temperature high-pressure air to the heat storage heat exchanger 21.
Preferably, the number of the compressors 61 is two or more groups, respectively connected to two or more heat storage heat exchangers 21.
In a preferred scheme, the work circuit 7 comprises an expansion machine 71 connected with a work pipeline, and the work pipeline is connected with the heat release circuit 3. The structure is simple, and when the heat-releasing heat exchanger 31 is used, the high-temperature and high-pressure air discharged from the heat-releasing heat exchanger drives the expander 71 at the terminal to do work.
Preferably, the number of the expanders 71 is two or more groups, respectively connected to the two or more heat release heat exchangers 31.
In a preferable scheme, a liquid inlet end of a packed bed 11 of the packed heat storage device 1 is connected with a pressure stabilizing system 13; an expansion tank 33 is connected to the heat release circuit 3. The structure is simple, when in use, the liquid inlet end of the packed bed 11 is connected with a pressure stabilizing system 13 for discharging air in a loop before the system is started; the expansion tank 33 is used for offsetting the pressure on the heat release pipeline caused by the abrupt temperature rise of the liquid heat transfer medium in the energy release process, and the working process is that when the pressure of the heat release pipeline is abruptly raised, part of the liquid heat transfer medium rapidly enters the expansion tank 33, so that the pressure of the heat release pipeline is reduced, and the phenomenon of pipe explosion is avoided.
Preferably, the pressure stabilizing system 13 comprises a pressure stabilizing device and a gas flow regulating valve which are sequentially connected in a pressure stabilizing pipeline, and one end of the gas flow regulating valve is connected with the liquid inlet end of the packed bed 11.
In a preferred embodiment, the method for storing and releasing energy of the combined heat-storage compressed-air energy storage system comprises the following steps:
s1, storing energy, starting the compressor 61 and the low-temperature shielding pump 22, converting high-temperature and high-pressure air into low-temperature and high-pressure air, and storing the low-temperature and high-pressure air in the air storage tank 41;
s1-1, allowing high-temperature and high-pressure air discharged by the compressor 61 to enter the heat storage heat exchanger 21, and performing heat conversion on the heat storage heat exchanger 21 and a low-temperature liquid heat transfer medium in the heat storage loop 2 after absorbing heat;
s1-2, enabling the liquid heat transfer medium in the liquid storage tank 12 to enter the heat storage loop 2, enabling the low-temperature shielding pump 22 to drive the liquid heat transfer medium in the heat storage loop 2 to continuously circulate, and enabling the liquid heat transfer medium to continuously absorb heat of the heat storage heat exchanger 21; meanwhile, the high-temperature and high-pressure air is cooled to form low-temperature and high-pressure air, and the low-temperature and high-pressure air enters the air storage tank 41 to be stored;
s1-3, when the liquid heat transfer medium in the liquid storage tank 12 reaches a set temperature value or the low-temperature high-pressure air in the air storage tank 41 reaches a set value, ending the energy storage process;
s2, releasing energy, starting the high-temperature shielding pump 32, converting low-temperature high-pressure air in the air storage tank 41 into high-temperature high-pressure air, and conveying the high-temperature high-pressure air to the expansion machine 71 to do work;
s2-1, low-temperature high-pressure air in the air storage tank 41 enters the heat release heat exchanger 31, and the heat release heat exchanger 31 absorbs heat and then performs heat conversion with the low-temperature high-pressure air in the air storage loop 4;
s2-2, liquid heat transfer medium in the liquid storage tank 12 enters the heat release loop 3, the high-temperature shielding pump 32 drives the liquid heat transfer medium in the heat release loop 3 to continuously circulate, and the heat of the liquid heat transfer medium is continuously conducted to the heat release heat exchanger 31; meanwhile, the low-temperature high-pressure air absorbs heat to form high-temperature high-pressure air to drive the expander 71 to do work;
s2-3, when the low-temperature high-pressure air in the air storage tank 41 is released to reach a set value or the temperature of the liquid heat transfer medium in the liquid storage tank 12 reaches a set value, ending the energy release process;
s3, auxiliary heating, in S2, when the temperature released by the liquid heat transfer medium in the heat release loop 3 cannot meet the requirement of the rated working temperature of the expansion machine 71, the heater 51 is started to heat the liquid heat transfer medium in the heat release loop 3;
in S1, the heat release circuit 3 is in a closed state, the exhaust line of the air tank 41 is closed, and the intake line is opened;
in S2, the thermal storage circuit 2 is in a closed state, the exhaust line of the air tank 41 is open, and the intake line is closed;
in S3, the liquid heat transfer medium does not pass through the packed bed 11. The method effectively overcomes the defect that in the energy release stage of the system, when the temperature released by the heat release loop 3 cannot meet the requirement of the rated working temperature, the auxiliary loop 5 is used for heating the heat release loop 3, so that the conversion efficiency of the system is improved, and the stable output power of the terminal is ensured.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (10)

1. The utility model provides a modular heat accumulation compressed air energy storage system which characterized by: the system comprises a filling heat storage device (1), a heat storage loop (2), a heat release loop (3), a gas storage loop (4), an auxiliary loop (5), a compression loop (6) and a work applying loop (7); the heat storage loop (2) is communicated with the heat release loop (3), the filling heat storage device (1) is positioned between the heat storage loop (2) and the heat release loop (3) and is communicated with the heat storage loop, the heat storage heat exchanger (21) of the heat storage loop (2) and the heat release heat exchanger (31) of the heat release loop (3) are connected with the gas storage loop (4), and the auxiliary loop (5) is connected with the heat release loop (3); the compression loop (6) and the work-doing loop (7) are respectively connected with the heat storage heat exchanger (21) and the heat release heat exchanger (31).
2. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the filling heat storage device (1) comprises a liquid storage tank (12) communicated with a liquid discharge end of the filling bed (11), one ends of the heat storage loop (2) and the heat release loop (3) are communicated with the liquid storage tank (12), and the other ends of the heat storage loop and the heat release loop are communicated with a liquid inlet end of the filling bed (11).
3. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the heat storage loop (2) comprises a heat storage heat exchanger (21) and a low-temperature shielding pump (22) which are connected with the heat storage pipeline in series.
4. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the heat release loop (3) comprises a heat release heat exchanger (31) and a high-temperature shielding pump (32) which are connected with the heat release pipeline in series.
5. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the gas storage loop (4) comprises a gas inlet pipeline and a gas outlet pipeline which are connected with the gas storage tank (41), and the gas inlet pipeline and the gas outlet pipeline are respectively connected with the heat storage heat exchanger (21) and the heat release heat exchanger (31).
6. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the auxiliary loop (5) comprises a heater (51) connected with the heating pipeline in series and a branch pipeline (52) connected with the heating pipeline, two ends of the heating pipeline are respectively connected with the liquid storage tank (12) and the heat release loop (3), and the branch pipeline (52) is connected with the heat release loop (3).
7. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the compression circuit (6) comprises a compressor (61) connected with a compression pipeline, and the compression pipeline is connected with the heat storage heat exchanger (21).
8. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the working circuit (7) comprises an expansion machine (71) connected with a working pipeline, and the working pipeline is connected with the heat release circuit (3).
9. The combined heat accumulating compressed air energy storage system of claim 1, wherein: the liquid inlet end of a packed bed (11) of the packed heat storage device (1) is connected with a pressure stabilizing system (13); an expansion tank (33) is connected to the heat release circuit (3).
10. The method for storing and releasing energy of the combined heat-storing compressed-air energy storage system according to any one of claims 1 to 9, characterized in that it comprises the following steps:
s1, storing energy, starting the compressor (61) and the low-temperature shielding pump (22), converting high-temperature and high-pressure air into low-temperature and high-pressure air, and storing the low-temperature and high-pressure air in the air storage tank (41);
s1-1, high-temperature and high-pressure air discharged by a compressor (61) enters a heat storage heat exchanger (21), and the heat storage heat exchanger (21) absorbs heat and then performs heat conversion with a low-temperature liquid heat transfer medium in a heat storage loop (2);
s1-2, enabling the liquid heat transfer medium in the liquid storage tank (12) to enter the heat storage loop (2), enabling the low-temperature shielding pump (22) to drive the liquid heat transfer medium in the heat storage loop (2) to continuously circulate, and enabling the liquid heat transfer medium to continuously absorb heat of the heat storage heat exchanger (21); meanwhile, the high-temperature and high-pressure air is cooled to form low-temperature and high-pressure air which enters the air storage tank (41) for storage;
s1-3, when the liquid heat transfer medium in the liquid storage tank (12) reaches a set temperature value or the low-temperature high-pressure air in the air storage tank (41) reaches a set value, ending the energy storage process;
s2, releasing energy, starting the high-temperature shielding pump (32), converting low-temperature high-pressure air in the air storage tank (41) into high-temperature high-pressure air, and conveying the high-temperature high-pressure air to the expansion machine (71) for acting;
s2-1, low-temperature high-pressure air in the air storage tank (41) enters a heat release heat exchanger (31), and the heat release heat exchanger (31) absorbs heat and then performs heat conversion with the low-temperature high-pressure air in the air storage loop (4);
s2-2, liquid heat transfer medium in the liquid storage tank (12) enters the heat release loop (3), the high-temperature shielding pump (32) drives the liquid heat transfer medium in the heat release loop (3) to continuously circulate, and the heat of the liquid heat transfer medium is continuously conducted to the heat release heat exchanger (31); meanwhile, the low-temperature high-pressure air absorbs heat to form high-temperature high-pressure air to drive the expander (71) to do work;
s2-3, when the low-temperature high-pressure air in the air storage tank (41) is released to reach a set value or the temperature of the liquid heat transfer medium in the liquid storage tank (12) reaches a set value, ending the energy release process;
s3, auxiliary heating, wherein in S2, when the temperature released by the liquid heat transfer medium in the heat release loop (3) cannot meet the requirement of the rated working temperature of the expansion machine (71), the heater (51) is started to heat the liquid heat transfer medium in the heat release loop (3);
in S1, the heat release loop (3) is in a closed state, the exhaust pipeline of the air storage tank (41) is closed, and the air inlet pipeline is opened;
in S2, the heat storage loop (2) is in a closed state, the exhaust pipeline of the air storage tank (41) is opened, and the air inlet pipeline is closed;
in S3, the liquid heat transfer medium does not pass through the packed bed (11).
CN202110420465.2A 2021-04-19 2021-04-19 Combined type heat storage compressed air energy storage system and method Withdrawn CN113062848A (en)

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CN109059318A (en) * 2018-09-03 2018-12-21 中国科学院工程热物理研究所 A kind of fountain packed bed heat reservoir and its operation method
CN111255720A (en) * 2020-01-19 2020-06-09 中国科学院工程热物理研究所 Temperature control variable working condition operation system based on heat accumulation type compressed air energy storage
CN111396162A (en) * 2020-04-20 2020-07-10 贵州电网有限责任公司 High-efficiency advanced compressed air energy storage system and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120216520A1 (en) * 2009-11-09 2012-08-30 Institute Of Engineering Thermophysics, Chinese Academy Of Sciences Energy storage system using supercritical air
CN109059318A (en) * 2018-09-03 2018-12-21 中国科学院工程热物理研究所 A kind of fountain packed bed heat reservoir and its operation method
CN111255720A (en) * 2020-01-19 2020-06-09 中国科学院工程热物理研究所 Temperature control variable working condition operation system based on heat accumulation type compressed air energy storage
CN111396162A (en) * 2020-04-20 2020-07-10 贵州电网有限责任公司 High-efficiency advanced compressed air energy storage system and method

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