CN111928525A - Liquefied air energy storage peak regulation system and method based on waste heat refrigeration - Google Patents
Liquefied air energy storage peak regulation system and method based on waste heat refrigeration Download PDFInfo
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- CN111928525A CN111928525A CN202010791504.5A CN202010791504A CN111928525A CN 111928525 A CN111928525 A CN 111928525A CN 202010791504 A CN202010791504 A CN 202010791504A CN 111928525 A CN111928525 A CN 111928525A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
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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
- F01D13/00—Combinations of two or more machines or engines
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a liquefied air energy storage and peak regulation system and method based on waste heat refrigeration, wherein the system consists of a first turbine set, a condenser, a second turbine set, a refrigeration compressor, a cascade refrigeration system, a cooling device, a cold storage device, an air compressor, a liquid air storage tank, a heater, an air expander, a heat storage system and a control valve; the invention utilizes the redundant steam to drive the cascade refrigeration system to obtain the required cold energy, greatly reduces the cryogenic production cost, effectively utilizes the latent heat of the steam, improves the energy storage efficiency, simultaneously utilizes the existing cooling device to provide cooling for the cascade refrigeration system, reduces the construction cost of the cascade refrigeration system, and simultaneously improves the utilization rate of coal-fired unit equipment.
Description
Technical Field
The invention belongs to the technical field of energy storage peak shaving, and particularly relates to a liquefied air energy storage peak shaving system and method based on waste heat refrigeration, which are suitable for various thermal power plants taking a coal-fired unit as a typical power plant and can improve the peak shaving capability of the coal-fired unit and the economy of an energy storage system.
Background
At present, renewable energy sources such as wind energy, solar energy and the like in China are rapidly developed year by year, in addition, the electricity consumption of the whole society is increased year by year, the electricity peak-valley difference of a power grid is increased day by day, and the requirements of the power grid on the peak regulation times and the depth of a coal-fired unit are greatly improved.
The technology for improving the peak regulation capacity of the coal-fired unit mainly comprises an electric boiler heat storage technology, a water tank heat storage technology, a steam turbine steam flow reconstruction technology, an electrochemical battery energy storage technology and the like, wherein electric energy is converted into heat energy for heating through the electric boiler heat storage technology, the peak regulation capacity is high, but the energy quality is greatly reduced, and the electric boiler heat storage technology is only suitable for a cogeneration unit, the water tank heat storage technology and the steam turbine steam flow reconstruction technology have the advantages of good heat economy, relatively low investment, limited peak regulation capacity and suitability for the cogeneration unit, the electrochemical battery energy storage technology has the advantages of quick response, small volume and short construction period, but short service life, high average cost and high safety risk, and whether the electric boiler is suitable for constructing large-scale energy storage and still needs engineering demonstration verification.
Disclosure of Invention
In order to overcome the defects of the peak shaving technology of the existing coal-fired unit, the invention provides the liquefied air energy storage peak shaving system and the method based on the waste heat refrigeration, the energy consumption is large in the cryogenic preparation process, the COP is very low, the refrigeration COP is generally not more than 0.2 at the refrigeration temperature of 150 ℃ below zero, which is also a key factor influencing the economical efficiency of the liquefied compressed air energy storage technology, and the invention can effectively solve the problem. The unit generates a large amount of redundant steam with work capacity during peak regulation, the steam is directly utilized to drive a small steam turbine and then drive a compressor to compress a refrigeration working medium, finally, the required refrigeration capacity is obtained through a cascade refrigeration system, and the production cost of the part of refrigeration capacity is basically zero; the heat of medium-pressure exhaust steam at the outlet of the small steam turbine is stored and used for heating low-temperature air in the expansion process, so that the outlet temperature of the air compressor can be further reduced, and the energy storage efficiency is improved; the condenser has low working load during peak shaving, the utilization rate of the cooling device is not high, the existing cooling device is utilized to provide cooling for the cascade refrigeration system, the construction cost of the cascade refrigeration system is reduced, and the utilization rate of coal-fired unit equipment is improved.
In order to achieve the purpose, the invention adopts the following technical scheme.
A liquefied air energy storage peak-shaving system based on waste heat refrigeration is composed of a first turbine set 1, a first valve 2, a second valve 3, a condenser 4, a second turbine set 5, a refrigeration compressor 6, a cascade refrigeration system 7, a cooling device 8, a third valve 9, a fourth valve 10, a cold storage device 11, an air compressor 12, a liquid air storage tank 13, a heater 14, an air expander 15, a heat storage system 16, a fifth valve 17, a sixth valve 18 and a seventh valve 19;
the first turbine set 1 comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected, an outlet of the intermediate-pressure cylinder is sequentially connected with the low-pressure cylinder and a condenser 4 through a first valve 2, and an outlet of the intermediate-pressure cylinder is connected with a steam inlet of a second turbine set 5 through a second valve 3; the second turbine set 5 directly drives the refrigeration compressor 6 to rotate through a connecting shaft, the refrigeration compressor 6 drives the cascade refrigeration system 7, and the cascade refrigeration system 7 is connected with the cold storage device 11 through a seventh valve 19; the cooling device 8 is connected with the condenser 4 through a third valve 9 and connected with the cascade refrigeration system 7 through a fourth valve 10; an outlet of the air compressor 12 is sequentially connected with a cooling liquefaction side inlet of the cold storage device 11, a cooling liquefaction side outlet of the cold storage device 11, a liquid air storage tank 13, a cold energy recovery side inlet of the cold storage device 11, a cold energy recovery side outlet of the cold storage device 11, a low-temperature side inlet of the heater 14, a low-temperature side outlet of the heater 14 and an air expander 15; an outlet of the second turbine set 5 is sequentially connected with a high-temperature side inlet of the heat storage system 16, a high-temperature side outlet of the heat storage system 16, a fifth valve 17 and an outlet of the condenser 4, and the heat storage system 16 is connected with the heater 14 through a sixth valve 18; the system utilizes redundant steam to drive the cascade refrigeration system to obtain required cold energy, greatly reduces the cryogenic production cost, effectively utilizes latent heat of the steam, improves the energy storage efficiency, simultaneously utilizes the existing cooling device to provide cooling for the cascade refrigeration system, reduces the construction cost of the cascade refrigeration system, and simultaneously improves the utilization rate of coal-fired unit equipment.
And the second valve 3 is connected with an outlet of an intermediate pressure cylinder of the first steam turbine set 1, or the steam extraction position is screened according to the condition of the generator set.
The cascade refrigeration system 7 is driven by a refrigeration compressor 6 driven by steam, and operates under high load during peak regulation, and does not operate basically during non-peak regulation, and the obtained cold energy is stored in a cold storage device 11 and is used for cooling and liquefying high-pressure air.
The air compressor 12 represents one stage or multiple stages, and when the air compressor is multiple stages, the compressed air enters the corresponding cooler, and the cooled air enters the next stage of compressor again to raise the pressure until reaching the final stage.
The air compressor 12 is driven by electrical energy or steam.
The heaters 14 and the air expanders 15 are in one stage or multiple stages, the number of the heaters 14 corresponds to that of the air expanders 15, and the corresponding air expanders are connected in series behind each stage of the heaters.
The heat storage system 16 is used for storing the latent heat and partial sensible heat of the medium-pressure exhaust steam at the outlet of the second turbine unit 5, and the comprehensive utilization rate of the steam is improved.
The cooling device 8 can simultaneously provide cooling for the condenser 4 and the cascade refrigeration system 7, and construction cost of the cascade refrigeration system 7 is reduced.
The system is suitable for a cogeneration unit and a straight condensing unit, greatly reduces the cryogenic preparation cost, can effectively utilize the latent heat of steam, and has good economy.
The operation method of the liquefied air energy storage peak shaving system based on heat rejection and refrigeration comprises an energy storage mode and an energy release mode, and specifically comprises the following steps:
an energy storage mode: when the power consumption of the power grid is low and the coal-fired unit is required to reduce the power generation load, the energy storage mode is started, the second valve 3, the fourth valve 10, the fifth valve 17 and the seventh valve 19 are opened, the opening degrees of the first valve 2 and the third valve 9 are adjusted, and the sixth valve 18 is closed; most of steam at the outlet of a medium pressure cylinder of the first steam turbine set 1 enters a second steam turbine set 5 to drive the second steam turbine set to rotate at a high speed, the second steam turbine set 5 drives a refrigeration compressor 6 to rotate through a connecting shaft so as to drive a cascade refrigeration system 7 to operate, cold energy prepared by the cascade refrigeration system 7 is stored in a cold storage device 11 through a seventh valve 19 by using a cold conveying medium, medium-pressure exhaust steam at the outlet of the second steam turbine set 5 enters a heat storage system 16 to release heat, the heat storage medium in the heat storage system 16 absorbs heat temperature rise, the medium-pressure exhaust steam is condensed into water and then is discharged to the outlet of a condenser 4 through a fifth valve 17, and then the water continues to enter a thermal system of a coal-fired unit; the rest steam at the outlet of the pressure cylinder in the first turbine unit 1 firstly enters the low-pressure cylinder of the first turbine unit 1 to do work, and then enters the condenser 4 to condense and release heat to supply cooling water in the cooling device 8; part of cooling water in the cooling device 8 enters the condenser 4 through the third valve 9 to cool the exhaust steam discharged from the outlet of the low-pressure cylinder of the first turbine unit 1, the rest of the cooling water enters the cascade refrigeration system 7 through the fourth valve 10 to cool the refrigeration working medium, and the cooling water absorbing heat returns to the cooling device 8; the air compressor 12 is driven by electric energy or steam to compress air, and the high-pressure air is cooled and liquefied by the cold storage device 11 and then enters the liquid air storage tank 13 for storage;
energy release mode: starting an energy release mode when the power consumption of the power grid is in a peak and the coal-fired unit is required to lift the power generation load, closing the second valve 3, the fourth valve 10, the fifth valve 17 and the seventh valve 19, and opening the first valve 2, the third valve 9 and the sixth valve 18; the low-temperature liquid air flows out from the liquid air storage tank 13, normal-temperature high-pressure air generated after cold energy recovery is carried out by the cold storage device 11 enters the heater 14, the high-temperature heat transfer medium enters the heater 14 from the heat storage system 16 through the sixth valve 18 to heat the air, the generated low-temperature heat transfer medium returns to the heat storage system 16 to be reheated, the high-temperature high-pressure air generated in the heater 14 enters the air expander 15 to be expanded to work and output electric energy, and normal-pressure normal-temperature air is discharged to the surrounding environment from the outlet of the air expander 15.
Compared with the prior art, the invention has the following advantages:
the liquefied air energy storage and peak regulation system and method based on waste heat refrigeration are suitable for various thermal power plants taking a coal-fired unit as a typical example, can improve the peak regulation capacity of the coal-fired unit and the economy of the energy storage system, utilize redundant steam to drive a cascade refrigeration system to obtain required cold energy, greatly reduce the cryogenic production cost, effectively utilize the latent heat of the steam, improve the energy storage efficiency, simultaneously utilize the existing cooling device to provide cooling for the cascade refrigeration system, reduce the construction cost of the cascade refrigeration system and improve the utilization rate of the coal-fired unit equipment.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure:
1-first turbine set 2-first valve 3-second valve 4-condenser
5-second turbine set 6-refrigeration compressor 7-cascade refrigeration system 8-cooling device
9-third valve 10-fourth valve 11-cold storage device 12-air compressor
13-liquid air storage tank 14-heater 15-air expander 16-heat storage system
17-fifth valve 18-sixth valve 19-seventh valve.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments, which are described herein for purposes of illustration only and are not intended to be limiting.
As shown in fig. 1, the liquefied air energy storage and peak shaving system based on waste heat refrigeration of the present invention is composed of a first turbine set 1, a first valve 2, a second valve 3, a condenser 4, a second turbine set 5, a refrigeration compressor 6, a cascade refrigeration system 7, a cooling device 8, a third valve 9, a fourth valve 10, a cold storage device 11, an air compressor 12, a liquid air storage tank 13, a heater 14, an air expander 15, a heat storage system 16, a fifth valve 17, a sixth valve 18, and a seventh valve 19.
The first turbine set 1 comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected, an outlet of the intermediate-pressure cylinder is sequentially connected with the low-pressure cylinder and a condenser 4 through a first valve 2, and an outlet of the intermediate-pressure cylinder is connected with a steam inlet of the second turbine set 5 through a second valve 3; the second turbine set 5 directly drives the refrigeration compressor 6 to rotate through a connecting shaft, the refrigeration compressor 6 drives the cascade refrigeration system 7, and the cascade refrigeration system 7 is connected with the cold storage device 11 through a seventh valve 19; the cooling device 8 is connected with the condenser 4 through a third valve 9 and connected with the cascade refrigeration system 7 through a fourth valve 10; an outlet of the air compressor 12 is sequentially connected with a cooling liquefaction side inlet of the cold storage device 11, a cooling liquefaction side outlet of the cold storage device 11, a liquid air storage tank 13, a cold energy recovery side inlet of the cold storage device 11, a cold energy recovery side outlet of the cold storage device 11, a low-temperature side inlet of the heater 14, a low-temperature side outlet of the heater 14 and an air expander 15; an outlet of the second turbine set 5 is sequentially connected with a high-temperature side inlet of the heat storage system 16, a high-temperature side outlet of the heat storage system 16, a fifth valve 17 and an outlet of the condenser 4, and the heat storage system 16 is connected with the heater 14 through a sixth valve 18. The system of the invention utilizes redundant steam to drive the cascade refrigeration system to obtain the required cold energy, greatly reduces the cryogenic production cost, effectively utilizes the latent heat of the steam, improves the energy storage efficiency, simultaneously utilizes the existing cooling device to provide cooling for the cascade refrigeration system, reduces the construction cost of the cascade refrigeration system, and simultaneously improves the utilization rate of coal-fired unit equipment.
The liquefied air energy storage and peak regulation system based on waste heat refrigeration can operate according to the following energy storage mode and energy release mode.
An energy storage mode: when the power consumption of the power grid is low and the coal-fired unit is required to reduce the power generation load, the energy storage mode is started, the second valve 3, the fourth valve 10, the fifth valve 17 and the seventh valve 19 are opened, the opening degrees of the first valve 2 and the third valve 9 are adjusted, and the sixth valve 18 is closed; most of steam at the outlet of a medium pressure cylinder of the first steam turbine set 1 enters a second steam turbine set 5 to drive the second steam turbine set to rotate at a high speed, the second steam turbine set 5 drives a refrigeration compressor 6 to rotate through a connecting shaft so as to drive a cascade refrigeration system 7 to operate, cold energy prepared by the cascade refrigeration system 7 is stored in a cold storage device 11 through a seventh valve 19 by using a cold conveying medium, medium-pressure exhaust steam at the outlet of the second steam turbine set 5 enters a heat storage system 16 to release heat, the heat storage medium in the heat storage system 16 absorbs heat temperature rise, the medium-pressure exhaust steam is condensed into water and then is discharged to the outlet of a condenser 4 through a fifth valve 17, and then the water continues to enter a thermal system of a coal-fired unit; the rest steam at the outlet of the pressure cylinder in the first turbine unit 1 firstly enters the low-pressure cylinder of the first turbine unit 1 to do work, and then enters the condenser 4 to condense and release heat to supply cooling water in the cooling device 8; part of cooling water in the cooling device 8 enters the condenser 4 through the third valve 9 to cool the exhaust steam discharged from the outlet of the low-pressure cylinder of the first turbine unit 1, the rest of the cooling water enters the cascade refrigeration system 7 through the fourth valve 10 to cool the refrigeration working medium, and the cooling water absorbing heat returns to the cooling device 8; the air compressor 12 is driven by electric energy or steam to compress air, and the high-pressure air is cooled and liquefied by the cold storage device 11 and then enters the liquid air storage tank 13 to be stored.
Energy release mode: starting an energy release mode when the power consumption of the power grid is in a peak and the coal-fired unit is required to lift the power generation load, closing the second valve 3, the fourth valve 10, the fifth valve 17 and the seventh valve 19, and opening the first valve 2, the third valve 9 and the sixth valve 18; the low-temperature liquid air flows out from the liquid air storage tank 13, normal-temperature high-pressure air generated after cold energy recovery is carried out by the cold storage device 11 enters the heater 14, the high-temperature heat transfer medium enters the heater 14 from the heat storage system 16 through the sixth valve 18 to heat the air, the generated low-temperature heat transfer medium returns to the heat storage system 16 to be reheated, the high-temperature high-pressure air generated in the heater 14 enters the air expander 15 to be expanded to work and output electric energy, and normal-pressure normal-temperature air is discharged to the surrounding environment from the outlet of the air expander 15.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the invention may be made by those skilled in the art within the spirit and scope of the invention. Any insubstantial modification of the invention using this concept is intended to be covered by the act of infringing the scope of the invention.
Claims (10)
1. The utility model provides a liquefied air energy storage system of peaking based on abandon heat refrigeration which characterized in that: the system is composed of a first turbine set (1), a first valve (2), a second valve (3), a condenser (4), a second turbine set (5), a refrigeration compressor (6), a cascade refrigeration system (7), a cooling device (8), a third valve (9), a fourth valve (10), a cold storage device (11), an air compressor (12), a liquid air storage tank (13), a heater (14), an air expander (15), a heat storage system (16), a fifth valve (17), a sixth valve (18) and a seventh valve (19);
the first steam turbine set (1) comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected, an outlet of the intermediate-pressure cylinder is sequentially connected with the low-pressure cylinder and a condenser (4) through a first valve (2), and an outlet of the intermediate-pressure cylinder is connected with a steam inlet of the second steam turbine set (5) through a second valve (3); the second steam turbine set (5) directly drives the refrigerating compressor (6) to rotate through a connecting shaft, the refrigerating compressor (6) drives the cascade refrigerating system (7), and the cascade refrigerating system (7) is connected with the cold storage device (11) through a seventh valve (19); the cooling device (8) is connected with the condenser (4) through a third valve (9) and is connected with the cascade refrigeration system (7) through a fourth valve (10); an outlet of the air compressor (12) is sequentially connected with a cooling liquefaction side inlet of the cold storage device (11), a cooling liquefaction side outlet of the cold storage device (11), a liquid air storage tank (13), a cold energy recovery side inlet of the cold storage device (11), a cold energy recovery side outlet of the cold storage device (11), a low-temperature side inlet of the heater (14), a low-temperature side outlet of the heater (14) and the air expander (15); an outlet of the second turbine set (5) is sequentially connected with a high-temperature side inlet of the heat storage system (16), a high-temperature side outlet of the heat storage system (16), a fifth valve (17) and an outlet of the condenser (4), and the heat storage system (16) is connected with the heater (14) through a sixth valve (18); the system utilizes redundant steam to drive the cascade refrigeration system to obtain required cold energy, greatly reduces the cryogenic production cost, effectively utilizes latent heat of the steam, improves the energy storage efficiency, simultaneously utilizes the existing cooling device to provide cooling for the cascade refrigeration system, reduces the construction cost of the cascade refrigeration system, and simultaneously improves the utilization rate of coal-fired unit equipment.
2. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: and the second valve (3) is connected with an outlet of a medium pressure cylinder of the first steam turbine set (1), or the steam extraction position is screened according to the condition of the generator set.
3. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the cascade refrigeration system (7) is driven by a refrigeration compressor (6) driven by steam, the cascade refrigeration system runs under high load during peak regulation, the cascade refrigeration system does not run basically during non-peak regulation, and the obtained cold energy is stored in a cold storage device (11) and is used for cooling and liquefying high-pressure air.
4. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the air compressor (12) represents one stage or multiple stages, when the air compressor is multiple stages, the air enters a corresponding cooler after being compressed, and the cooled air enters the next stage of compressor again to raise the pressure until reaching the final stage.
5. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the air compressor (12) is driven by electrical energy or steam.
6. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the heaters (14) and the air expanders (15) are in one stage or multiple stages, the number of the heaters (14) corresponds to that of the air expanders (15), and the corresponding air expanders are connected in series behind each stage of the heaters.
7. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the heat storage system (16) is used for storing the latent heat and partial sensible heat of medium-pressure exhaust steam at the outlet of the second turbine set (5), and the comprehensive utilization rate of the steam is improved.
8. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the cooling device (8) simultaneously provides cooling for the condenser (4) and the cascade refrigeration system (7), and construction cost of the cascade refrigeration system (7) is reduced.
9. The system of claim 1, wherein the peak shaving refrigeration based liquefied air energy storage system comprises: the system is suitable for a cogeneration unit and a straight condensing unit, greatly reduces the cryogenic preparation cost, can effectively utilize the latent heat of steam, and has good economy.
10. The method for operating a waste heat refrigeration-based liquefied air energy storage peak shaving system according to any one of claims 1 to 9, wherein: the energy storage device comprises an energy storage mode and an energy release mode, and specifically comprises the following steps:
an energy storage mode: the method comprises the steps that when the power consumption of a power grid is low and a coal-fired unit is needed to reduce the power generation load, an energy storage mode is started, a second valve (3), a fourth valve (10), a fifth valve (17) and a seventh valve (19) are opened, the opening degrees of a first valve (2) and a third valve (9) are adjusted, and a sixth valve (18) is closed; most steam at the outlet of a medium pressure cylinder of the first steam turbine set (1) enters a second steam turbine set (5) to drive the second steam turbine set to rotate at a high speed, the second steam turbine set (5) drives a refrigeration compressor (6) to rotate through a connecting shaft so as to drive a cascade refrigeration system (7) to operate, cold energy produced by the cascade refrigeration system (7) is stored in a cold storage device (11) through a seventh valve (19) by using a cold conveying medium, medium-pressure exhaust steam at the outlet of the second steam turbine set (5) enters a heat storage system (16) to release heat, the heat storage medium in the heat storage system (16) absorbs heat and rises in temperature, the medium-pressure exhaust steam is condensed into water and then is discharged to the outlet of a condenser (4) through a fifth valve (17), and then continuously enters a coal-fired thermal power unit; the rest steam at the outlet of the medium pressure cylinder of the first turbine set (1) firstly enters the low pressure cylinder of the first turbine set (1) to do work, and then enters the condenser (4) to condense and release heat to supply cooling water in the cooling device (8); part of cooling water in the cooling device (8) enters the condenser (4) through the third valve (9) to cool the dead steam discharged from the outlet of the low-pressure cylinder of the first turbine unit (1), the rest of the cooling water enters the cascade refrigeration system (7) through the fourth valve (10) to cool the refrigeration working medium, and the cooling water absorbing heat returns to the cooling device (8); the air compressor (12) is driven by electric energy or steam to compress air, and the high-pressure air enters the liquid air storage tank (13) for storage after being cooled and liquefied by the cold storage device (11);
energy release mode: starting an energy release mode when the power consumption peak of a power grid and the power generation load of a coal-fired unit need to be lifted, closing a second valve (3), a fourth valve (10), a fifth valve (17) and a seventh valve (19), and opening a first valve (2), a third valve (9) and a sixth valve (18); the low-temperature liquid air flows out from the liquid air storage tank (13), normal-temperature high-pressure air generated after cold energy is recovered through the cold storage device (11) enters the heater (14), a high-temperature heat transfer medium enters the heater (14) from the heat storage system (16) through the sixth valve (18) to heat the air, the generated low-temperature heat transfer medium returns to the heat storage system (16) to be reheated, the high-temperature high-pressure air generated in the heater (14) enters the air expander (15) to be expanded to work and output electric energy, and the outlet of the air expander (15) is normal-pressure normal-temperature air and is discharged into the surrounding environment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114440487A (en) * | 2022-01-30 | 2022-05-06 | 上海发电设备成套设计研究院有限责任公司 | System device for reducing backpressure of coal-fired unit |
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