CN113175426A - Advanced liquefied compressed air energy storage peak shaving system and method - Google Patents
Advanced liquefied compressed air energy storage peak shaving system and method Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005338 heat storage Methods 0.000 claims abstract description 55
- 238000003860 storage Methods 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 37
- 230000006835 compression Effects 0.000 claims abstract description 36
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 49
- 238000009825 accumulation Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000008236 heating water Substances 0.000 description 1
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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
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- 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
- F01K7/02—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 being of multiple-expansion type
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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
- F04B25/00—Multi-stage pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
本发明公开了一种先进液化压缩空气储能调峰系统及方法，包括压缩蓄热系统、制冷液化及储能系统及升温膨胀发电系统；压缩储热系统中冷凝器的出口与制冷液化及储能系统中蓄冷罐的放热侧入口相连通，制冷液化及储能系统中蓄冷罐顶部的气体出口与压缩储热系统的入口相连通，压缩储热系统中蓄热罐的出口与升温膨胀发电系统的入口相连通，制冷液化及储能系统中蓄冷罐的吸热侧出口与升温膨胀发电系统的入口相连通，该系统及方法能够满足电源侧储能及深度调峰的要求，且具有安全性、经济性较高的特点。
The invention discloses an advanced liquefied compressed air energy storage peak regulation system and method, including a compression heat storage system, a refrigeration liquefaction and energy storage system, and a temperature rise and expansion power generation system; The heat release side inlet of the cold storage tank in the energy system is connected, the gas outlet on the top of the cold storage tank in the refrigeration liquefaction and energy storage system is connected with the inlet of the compression heat storage system, and the outlet of the heat storage tank in the compression heat storage system is connected with the heating expansion to generate electricity The inlet of the system is connected, and the outlet of the heat absorption side of the cold storage tank in the refrigeration liquefaction and energy storage system is connected with the inlet of the heating expansion power generation system. The system and method can meet the requirements of energy storage on the power supply side and deep peak regulation, and have safety Features of high performance and economy.
Description
Technical Field
The invention belongs to the field of power supply side deep peak regulation and compressed air energy storage, and relates to an advanced liquefied compressed air energy storage peak regulation system and method.
Background
In order to deal with global climate change, energy conservation and emission reduction of thermal power generating units and high-speed development of new energy must be greatly promoted. And a large amount of new energy electric quantity which is indefinite in cloudy and sunny is combined into a grid, so that basic energy electric power which mainly generates electricity by a thermal power generating unit is forced to fully participate in deep peak shaving. Aiming at the change of the development mode of the thermal power generating unit, the government of China and all parts successively issues a power supply side deep peak regulation electricity price subsidy policy, and the enthusiasm of the power supply side for deep peak regulation of the unit is greatly improved. And the current power supply participating in deep peak shaving deviates from the design value for a long time to run, so that the safety and the economy of the unit are reduced. From the technology and the practice of transformation, the transformed unit has the problems of unstable boiler low-load combustion and hydrodynamic circulation safety, full-load investment of a denitration device and low-load cooling of a steam turbine, flexibility of a control system during long-term low load and quick load change, equipment operation period and service life attenuation, heat supply unit thermoelectric decoupling and the like to different degrees.
At present, the research work of deep peak regulation on the power supply side is very active at home and abroad, and meanwhile, the flexibility technology of the thermal power generating unit can be roughly divided into two major categories: firstly, a boiler side low-load stable combustion and turbine side low-pressure cylinder cutting technology (the boiler and the turbine are in extremely low-load operation for a long time and are frequently switched between high load and low load, and the equipment safety and the economical efficiency are poor); and secondly, a thermal power generating unit is coupled with a hot water tank and an electric boiler heat storage technology (only suitable for the heating period in winter, high-grade electric energy is used for heating water, and the economy is poor). The power side compressed air energy storage technology is one of the most promising deep peak regulation technologies at present, and the excess electric quantity in the power side energy storage deep peak regulation process is utilized to compress air for energy storage, so that the flexibility of the power side is greatly improved, and the effects of economy, high efficiency and energy saving are achieved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an advanced liquefied compressed air energy storage peak regulation system and method, which can meet the requirements of power supply side energy storage and deep peak regulation and have the characteristics of high safety and high economical efficiency.
In order to achieve the purpose, the advanced liquefied compressed air energy storage and peak regulation system comprises a compression heat storage system, a refrigeration liquefaction and energy storage system and a heating expansion power generation system;
the outlet of the condenser in the compression heat storage system is communicated with the heat release side inlet of the cold storage tank in the refrigeration liquefaction and energy storage system, the gas outlet at the top of the cold storage tank in the refrigeration liquefaction and energy storage system is communicated with the inlet of the compression heat storage system, the outlet of the heat storage tank in the compression heat storage system is communicated with the inlet of the warming expansion power generation system, and the heat absorption side outlet of the cold storage tank in the refrigeration liquefaction and energy storage system is communicated with the inlet of the warming expansion power generation system.
The compression heat storage system comprises a first-stage compressor, a second-stage compressor, a third-stage compressor, a fourth-stage compressor, a condenser and a heat storage tank;
the outlet of the first-stage compressor is communicated with the inlet of the second-stage compressor and the inlet of the heat storage tank, the outlet of the second-stage compressor is communicated with the inlet of the third-stage compressor and the inlet of the heat storage tank, the outlet of the third-stage compressor is communicated with the inlet of the fourth-stage compressor and the inlet of the heat storage tank, the outlet of the fourth-stage compressor is communicated with the heat release side inlet of the condenser, the heat release side outlet of the condenser is communicated with the heat release side inlet of the heat storage tank in the refrigeration liquefaction and energy storage system, and the outlet of the heat storage tank is communicated with the inlet of the warming expansion power generation system.
The refrigeration liquefaction and energy storage system comprises an accumulation tank, an expander, a gas-liquid separator and a low-temperature storage tank;
the heat release side outlet of the cold accumulation tank is communicated with the inlet of the expansion machine, the outlet of the expansion machine is communicated with the inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is communicated with the inlet of the low-temperature storage tank, the gas outlet of the gas-liquid separator is communicated with the inlet of the primary compressor through the cold accumulation tank, and the outlet of the low-temperature storage tank is communicated with the heat absorption side inlet of the cold accumulation tank through the low-temperature liquid pump.
The outlet of the low-temperature storage tank is communicated with the heat absorption side inlet of the cold accumulation tank through a low-temperature liquid pump.
The heating expansion power generation system comprises a low pressure cylinder, a heater, a primary expander, a secondary expander and a tertiary expander;
the exhaust port of the low pressure cylinder and the heat releasing side outlet of the cold accumulation tank are communicated with the heat absorbing side inlet of the heater, the heat absorbing side outlet of the heater is communicated with the inlet of the first-stage expander, the outlet of the first-stage expander is communicated with the inlet of the third-stage expander through the second-stage expander, and the outlet of the heat accumulation tank is communicated with the heat releasing side of the heater, the inlet of the second-stage expander and the inlet of the third-stage expander.
The system also comprises a high-temperature reheater and a high-pressure cylinder; the exhaust port of the high-pressure cylinder is communicated with the inlet of the second-stage expander, and the outlet of the high-temperature reheater is communicated with the inlet of the third-stage expander.
The first-stage expansion machine is connected with the No. 1 generator, the second-stage expansion machine is connected with the No. 2 generator, and the third-stage expansion machine is connected with the No. 3 generator.
An advanced liquefied compressed air energy storage peak regulation method comprises the following steps:
when the power supply side needs deep peak regulation, the air is compressed and heated through a compression and heat storage system, the compressed and heated air is divided into two paths, one path of the compressed and heated air is stored in a heat storage tank, the other path of the compressed and heated air enters a refrigeration and liquefaction and energy storage system for cooling and liquefaction, then gas-liquid separation is carried out, the separated gas is sent into the compression and heat storage system, and the separated liquid is stored through a low-temperature storage tank;
when the power supply side needs to generate power and supply power, the compression heat storage system stops working, and the heating expansion power generation system generates power by using the liquid stored in the low-temperature storage tank and the hot working medium stored in the heat storage tank.
When the power supply side needs deep peak shaving, the first-stage compressor, the second-stage compressor, the third-stage compressor and the fourth-stage compressor are started, wherein, the air output by the first-stage compressor enters the first-stage compressor for first-stage compression, the air output by the first-stage compressor enters the second-stage compressor for compression after being cooled, the air output by the second-stage compressor enters the third-stage compressor for compression after being cooled, the air output by the third-stage compressor enters the fourth-stage compressor for compression after being cooled, the air output by the fourth-stage compressor enters the heat release side of the condenser for cooling, the air output by the heat release side of the condenser enters the cold storage tank for deep cooling, then the working medium enters an expansion machine for expansion, the working medium output by the expansion machine enters a gas-liquid separator for separation, the separated gas is sent into a first-stage compressor through a cold accumulation tank, and the separated liquid is stored in a low-temperature storage tank for deep liquefaction and compressed air energy storage.
When the power supply side needs to generate electricity and supply power, the first-stage compressor, the second-stage compressor, the third-stage compressor and the fourth-stage compressor are closed, the hot working medium output by the heat storage tank is divided into three paths, and one path of the hot working medium enters the heat release side of the heater to release heat; the liquid output by the low-temperature storage tank is boosted by a low-temperature liquid pump and then enters a heat absorption side of the cold storage tank for heating, the liquid output by the heat absorption side of the cold storage tank is mixed with the exhaust gas of the low-pressure cylinder and then enters the heat absorption side of the heater for heating, the working medium output by the heat absorption side of the heater enters a primary expansion machine for power generation, the working medium output by the primary expansion machine, the exhaust gas of the high-pressure cylinder and a second path of thermal medium output by the heat storage tank are mixed and then sent to a secondary expansion machine for acting, and the working medium output by the secondary expansion machine, the steam output by the high-temperature reheater and a third path of thermal medium output by the heat storage tank are mixed and then enter a tertiary expansion machine for acting.
The invention has the following beneficial effects:
the advanced liquefied compressed air energy storage and peak regulation system and the method have the advantages that during specific operation, energy storage and peak regulation at the power supply side are realized by utilizing the low valley excess electric quantity compressed air energy storage, so that the power supply side always operates stably, the potential harm to a unit and auxiliary equipment caused by rapid load change of deep peak regulation is solved, specifically, when the power supply side needs deep peak regulation, the air is compressed and heated through the compression and heat storage system, the air after being compressed and heated is divided into two paths, one path is stored, the other path enters the refrigeration and liquefaction and energy storage system to be cooled and liquefied, then gas and liquid separation is carried out, the separated liquid is stored, the liquid air is small in size and easy to store, the restriction caused by compressed air storage is thoroughly solved, meanwhile, electric energy is consumed, and deep peak regulation is realized. In addition, when the power supply side needs to generate power and supply power, the stored thermal working medium and liquid are used for generating power through the temperature rise expansion power generation system, stable electric quantity can be rapidly provided for the outside, and the device has the characteristics of simple system, rapid response, strong energy storage capacity and large deep peak regulation potential, and is high in safety and economical efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a first-stage compressor, 2 is a second-stage compressor, 3 is a third-stage compressor, 4 is a fourth-stage compressor, 5 is a condenser, 6 is a cold storage tank, 7 is an expander, 8 is a gas-liquid separator, 9 is a low-temperature storage tank, 10 is a low-temperature liquid pump, 11 is a heat storage tank, 12 is a heater, 13 is a first-stage expander, 14 is a number 1 generator, 15 is a second-stage expander, 16 is a number 2 generator, 17 is a third-stage expander, and 18 is a number 3 generator.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the advanced liquefied compressed air energy storage and peak shaving system of the present invention includes a compression heat storage system, a refrigeration liquefaction and energy storage system, and a heating expansion power generation system;
the compression heat storage system comprises a first-stage compressor 1, a second-stage compressor 2, a third-stage compressor 3, a fourth-stage compressor 4, a condenser 5 and a heat storage tank 11; the outlet of the first-stage compressor 1 is communicated with the inlet of the second-stage compressor 2 and the inlet of the heat storage tank 11, the outlet of the second-stage compressor 2 is communicated with the inlet of the third-stage compressor 3 and the inlet of the heat storage tank 11, the outlet of the third-stage compressor 3 is communicated with the inlet of the fourth-stage compressor 4 and the inlet of the heat storage tank 11, and the outlet of the fourth-stage compressor 4 is communicated with the heat release side inlet of the condenser 5;
the refrigeration, liquefaction and energy storage system comprises an cold storage tank 6, an expansion machine 7, a gas-liquid separator 8, a low-temperature storage tank 9 and a low-temperature liquid pump 10; the heat release side outlet of the condenser 5 is communicated with the inlet of the cold accumulation tank 6, the outlet of the cold accumulation tank 6 is communicated with the inlet of the expander 7, the outlet of the expander 7 is communicated with the inlet of the gas-liquid separator 8, the liquid outlet of the gas-liquid separator 8 is communicated with the inlet of the low-temperature storage tank 9, and the gas outlet of the gas-liquid separator 8 is communicated with the inlet of the primary compressor 1 through the cold accumulation tank 6; the outlet of the low-temperature storage tank 9 is communicated with the cold accumulation tank 6 through a low-temperature liquid pump 10;
an exhaust port of the low pressure cylinder and an outlet of the cold accumulation tank 6 are communicated with an inlet of a heat absorption side of the heater 12, an outlet of the heat absorption side of the heater 12 is communicated with an inlet of the primary expander 13, an outlet of the primary expander 13 is communicated with an inlet of the tertiary expander 17 through the secondary expander 15, and an outlet of the heat accumulation tank 11 is communicated with a heat radiation side of the heater 12, an inlet of the secondary expander 15 and an inlet of the tertiary expander 17;
the exhaust port of the high-pressure cylinder is communicated with the inlet of the secondary expander 15, and the outlet of the high-temperature reheater is communicated with the inlet of the tertiary expander 17;
the primary expander 13 is connected to a generator 14 No. 1, the secondary expander 15 is connected to a generator 16 No. 2, and the tertiary expander 17 is connected to a generator 18 No. 3.
The compression heat storage system adopts four-stage compression, heat conducting oil is adopted among stages of each stage, and all the stages are communicated with the heat storage tank 11.
The advanced liquefied compressed air energy storage peak regulation method comprises the following steps:
when the power supply side needs deep peak shaving, a first-stage compressor 1, a second-stage compressor 2, a third-stage compressor 3 and a fourth-stage compressor 4 are started, wherein 0.1MPa and 20 ℃ purified air output by the first-stage compressor 1 enters the first-stage compressor 1 for first-stage compression, 0.3-0.5 MPa and 150-170 ℃ air output by the first-stage compressor 1 is cooled to 70-90 ℃ and then enters the second-stage compressor 2 for compression, 0.9-1.1 MPa and 230-250 ℃ air output by the second-stage compressor 2 are cooled to 100-130 ℃ and then enter the third-stage compressor 3 for compression, 2.7-3 MPa and 280-300 ℃ air output by the third-stage compressor 3 are cooled to 130-150 ℃ and then enter the fourth-stage compressor 4 for compression, 8-8.5 MPa and 320-400 ℃ air output by the fourth-stage compressor 4 enters the heat release side of a condenser 5 for cooling, wherein the MW consumed in the whole compression process is (38-50), 8-8.5 MPa air and 10-20 ℃ air output by the heat release side of the condenser 5 enter a cold storage tank for deep cooling and then enter an expansion machine 7 for expansion, 0.1 MPa-170-195 ℃ working medium output by the expansion machine 7 enters a gas-liquid separator 8 for separation, the separated gas is sent into a primary compressor 1 through a cold storage tank 6, the separated liquid is stored in a low-temperature storage tank 9 for deep liquefaction and compressed air energy storage, and the electric energy consumed in the process is converted into liquefied compressed air for storage.
When the power supply side needs to generate electricity and supply power, the first-stage compressor 1, the second-stage compressor 2, the third-stage compressor 3 and the fourth-stage compressor 4 are closed, the hot working medium output by the heat storage tank 11 is divided into three paths, and one path of the hot working medium enters the heat release side of the heater 12 to release heat; starting a low-temperature liquid pump 10, boosting the pressure of liquid output by a low-temperature storage tank 9 to 8-10 MPa through the low-temperature liquid pump 10, then entering a heat absorption side of a cold accumulation tank 6 for heating, 8-10 MPa output by the cold accumulation tank 6, mixing the liquid at 10-15 ℃ with exhaust gas of a low-pressure cylinder, entering a heat absorption side of a heater 12 for heating, entering a working medium at 300-350 ℃ into a primary expansion machine 13 for acting and generating power, mixing the working medium at 200-250 ℃ with exhaust gas of a high-pressure cylinder and a second hot working medium output by a heat accumulation tank to form 4-5 MPa and a working medium at 300-350 ℃ and then sending the working medium into a secondary expansion machine 15 for acting, mixing the working medium at 210-250 ℃ with steam output by a high-temperature reheater and a third hot working medium output by the heat accumulation tank 11 to form 2-3 MPa, working medium with the temperature of 410-450 ℃ enters the three-stage expansion machine 17 to do work, and the parameters of the working medium output by the three-stage expansion machine 17 are 0.1-0.3 MPa and 40-50 ℃. The process can rapidly provide stable electric quantity for a power supply side, increase the generated energy and achieve the system efficiency of 52-58%.
Claims (10)
1. An advanced liquefied compressed air energy storage and peak regulation system is characterized by comprising a compression heat storage system, a refrigeration liquefaction and energy storage system and a heating expansion power generation system;
an outlet of a condenser (5) in the compression heat storage system is communicated with a heat release side inlet of a cold storage tank (6) in the refrigeration liquefaction and energy storage system, a gas outlet at the top of the cold storage tank (6) in the refrigeration liquefaction and energy storage system is communicated with an inlet of the compression heat storage system, an outlet of a heat storage tank (11) in the compression heat storage system is communicated with an inlet of the warming expansion power generation system, and an outlet of a heat absorption side of the cold storage tank (6) in the refrigeration liquefaction and energy storage system is communicated with an inlet of the warming expansion power generation system.
2. The advanced liquefied compressed air energy storage and peak shaving system according to claim 1, wherein the compression and heat storage system comprises a first-stage compressor (1), a second-stage compressor (2), a third-stage compressor (3), a fourth-stage compressor (4), a condenser (5) and a heat storage tank (11);
the outlet of the first-stage compressor (1) is communicated with the inlet of the second-stage compressor (2) and the inlet of the heat storage tank (11), the outlet of the second-stage compressor (2) is communicated with the inlet of the third-stage compressor (3) and the inlet of the heat storage tank (11), the outlet of the third-stage compressor (3) is communicated with the inlet of the fourth-stage compressor (4) and the inlet of the heat storage tank (11), the outlet of the fourth-stage compressor (4) is communicated with the heat release side inlet of the condenser (5), the heat release side outlet of the condenser (5) is communicated with the heat release side inlet of the cold storage tank (6) in the refrigeration liquefaction and energy storage system, and the outlet of the heat storage tank (11) is communicated with the inlet of the warming expansion power generation system.
3. The advanced liquefaction compressed air energy storage peak shaving system according to claim 1, wherein the refrigeration liquefaction and energy storage system comprises an accumulator tank (6), an expander (7), a gas-liquid separator (8) and a cryogenic storage tank (9);
the heat release side outlet of the cold accumulation tank (6) is communicated with the inlet of the expander (7), the outlet of the expander (7) is communicated with the inlet of the gas-liquid separator (8), the liquid outlet of the gas-liquid separator (8) is communicated with the inlet of the low-temperature storage tank (9), the gas outlet of the gas-liquid separator (8) is communicated with the inlet of the primary compressor (1) through the cold accumulation tank (6), and the outlet of the low-temperature storage tank (9) is communicated with the heat absorption side inlet of the cold accumulation tank (6) through the low-temperature liquid pump (10).
4. The advanced liquefied compressed air energy-storage peak shaving system according to claim 3, wherein the outlet of the cryogenic storage tank (9) is communicated with the heat absorption side inlet of the cold accumulation tank (6) via a cryogenic liquid pump (10).
5. The advanced liquefied compressed air energy storage and peak shaving system according to claim 1, wherein the temperature rise expansion power generation system comprises a low pressure cylinder, a heater (12), a primary expander (13), a secondary expander (15) and a tertiary expander (17);
an exhaust port of the low pressure cylinder and a heat release side outlet of the cold accumulation tank (6) are communicated with a heat absorption side inlet of the heater (12), a heat absorption side outlet of the heater (12) is communicated with an inlet of the primary expansion machine (13), an outlet of the primary expansion machine (13) is communicated with an inlet of the tertiary expansion machine (17) through the secondary expansion machine (15), and an outlet of the heat accumulation tank (11) is communicated with a heat release side of the heater (12), an inlet of the secondary expansion machine (15) and an inlet of the tertiary expansion machine (17).
6. The advanced liquefied compressed air energy storage and peak shaving system according to claim 5, further comprising a high temperature reheater and high pressure cylinder; the exhaust port of the high-pressure cylinder is communicated with the inlet of the second-stage expansion machine (15), and the outlet of the high-temperature reheater is communicated with the inlet of the third-stage expansion machine (17).
7. The advanced liquefied compressed air energy storage and peak shaving system according to claim 5, wherein the first stage expander (13) is connected to the No. 1 generator (14), the second stage expander (15) is connected to the No. 2 generator (16), and the third stage expander (17) is connected to the No. 3 generator (18).
8. An advanced liquefied compressed air energy storage peak shaving method is characterized by comprising the following steps:
when the power supply side needs deep peak regulation, the air is compressed and heated through a compression heat storage system, the compressed and heated air is divided into two paths, one path of the compressed and heated air is stored in a heat storage tank (11), the other path of the compressed and heated air enters a refrigeration liquefaction and energy storage system for cooling and liquefaction, then gas-liquid separation is carried out, the separated gas is sent into the compression heat storage system, and the separated liquid is stored through a low-temperature storage tank (9);
when the power supply side needs to generate power and supply power, the compression heat storage system stops working, and the heating expansion power generation system generates power by using the liquid stored in the low-temperature storage tank (9) and the hot working medium stored in the heat storage tank (11).
9. The advanced liquefied compressed air energy storage peak shaving method according to claim 8,
when the power supply side needs deep peak shaving, a first-stage compressor (1), a second-stage compressor (2), a third-stage compressor (3) and a fourth-stage compressor (4) are started, wherein air output by the first-stage compressor (1) enters the first-stage compressor (1) for first-stage compression, air output by the first-stage compressor (1) enters the second-stage compressor (2) for compression after being cooled, air output by the second-stage compressor (2) enters the third-stage compressor (3) for compression after being cooled, air output by the third-stage compressor (3) enters the fourth-stage compressor (4) for compression after being cooled, air output by the fourth-stage compressor (4) enters a heat release side of a condenser (5) for cooling, air output by the heat release side of the condenser (5) enters a cold storage tank for deep cooling and then enters an expander (7) for expansion, working medium output by the expander (7) enters a gas-liquid separator (8) for separation, the separated gas is sent into a first-stage compressor (1) through a cold storage tank (6), and the separated liquid is stored in a low-temperature storage tank (9) to be subjected to deep liquefaction and compressed air energy storage.
10. The advanced liquefied compressed air energy storage and peak shaving method according to claim 8, wherein when the power supply side needs to generate electricity, the first-stage compressor (1), the second-stage compressor (2), the third-stage compressor (3) and the fourth-stage compressor (4) are turned off, the hot working medium output by the heat storage tank (11) is divided into three paths, and one path enters the heat release side of the heater (12) to release heat; liquid output by the low-temperature storage tank (9) is boosted by a low-temperature liquid pump (10) and then enters the heat absorption side of the cold storage tank (6) for heating, liquid output by the heat absorption side of the cold storage tank (6) is mixed with exhaust gas of a low-pressure cylinder and then enters the heat absorption side of the heater (12) for heating, working medium output by the heat absorption side of the heater (12) enters the primary expansion machine (13) for acting and power generation, working medium output by the primary expansion machine (13), exhaust gas of a high-pressure cylinder and a second hot working medium output by the heat storage tank (11) are mixed and then are sent into the secondary expansion machine (15) for acting, and working medium output by the secondary expansion machine (15), steam output by the high-temperature reheater and a third hot working medium output by the heat storage tank (11) are mixed and then enter the tertiary expansion machine (17) for acting.
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