CN111271143A - System and method for improving electric power flexibility - Google Patents
System and method for improving electric power flexibility Download PDFInfo
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- CN111271143A CN111271143A CN202010203405.0A CN202010203405A CN111271143A CN 111271143 A CN111271143 A CN 111271143A CN 202010203405 A CN202010203405 A CN 202010203405A CN 111271143 A CN111271143 A CN 111271143A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005338 heat storage Methods 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000004146 energy storage Methods 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- 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
- 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
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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
- 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
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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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
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a system and a method for improving electric flexibility, wherein the system consists of a multistage compressor, a multistage cooler, a gas-liquid conversion device, a liquid air storage tank, a multistage heater, a multistage expander, a heat storage system, a generator set, a flexibility control device and a control valve; the operation method of the system comprises an energy storage mode and an energy release mode; when the method is applied to a coal-fired power plant, the peak regulation capacity and the response speed of the unit can be improved, the frequency modulation performance of the unit can be improved, the stability of the electric output power can be improved when the method is applied to a photovoltaic power plant and a wind power plant, and the consumption capacity of a power grid to new energy can be improved.
Description
Technical Field
The invention belongs to the technical field of energy storage peak shaving, and particularly relates to a system and a method for improving electric power flexibility, which are suitable for power plants with flexibility requirements such as coal-fired units and the like, are also suitable for power plants with stable output requirements such as photovoltaic power, wind power and the like, and can improve the electric energy quality of the power plants and improve the stability of an electric power 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.
Aiming at the problems, the system and the method for improving the flexibility of the electric power are provided, and are suitable for a cogeneration unit and a straight condensing unit, and are also suitable for a photovoltaic power plant and a wind power plant.
Disclosure of Invention
In order to improve the flexibility and stability of power generation of a power plant, the invention provides a system and a method for improving the flexibility of electric power, which are suitable for power plants with flexibility requirements such as coal-fired units and the like, and also suitable for power plants with stable output requirements such as photovoltaic power, wind power and the like, and can improve the electric energy quality of the power plants and improve the stability of an electric power system.
In order to achieve the purpose, the invention adopts the following technical scheme.
A system for improving electric flexibility is composed of a multistage compressor, a multistage cooler, a gas-liquid conversion device 5, a liquid air storage tank 6, a multistage heater, a multistage expander, a heat storage system cold tank 11, a heat storage system hot tank 12, a first valve 13, a second valve 14, a generator set 15 and a flexibility control device 16;
the multistage compressors correspond to the multistage coolers one by one, and the corresponding coolers are connected in series behind each stage of compressor; the multistage heaters correspond to the multistage expanders one by one, and the corresponding expanders are connected in series behind each stage of heater; the outlet of the first-stage compressor is sequentially communicated with a high-temperature side inlet of a first-stage cooler, a high-temperature side outlet of the first-stage cooler, a second-stage compressor, a high-temperature side inlet of a second-stage cooler, a high-temperature side outlet of a second-stage cooler, a high-temperature side inlet of a last-stage compressor, a high-temperature side inlet of a last-stage cooler, a high-temperature side outlet of the last-stage cooler, a cooling liquefaction side inlet of the gas-liquid conversion device 5, a cooling liquefaction side outlet of the gas-liquid conversion; an outlet of the liquid air storage tank 6 is sequentially communicated with a cold energy recovery side inlet of a gas-liquid conversion device 5, a cold energy recovery side outlet of the gas-liquid conversion device 5, a low-temperature side inlet of a first-stage heater, a low-temperature side outlet of the first-stage heater, a first-stage expander, a low-temperature side inlet of a second-stage heater, a low-temperature side outlet of the second-stage heater, a second-stage expander, a low-temperature side inlet of a heater up to a final-stage, a low-temperature side outlet of the final-; an outlet of a heat storage system cold tank 11 is communicated with a low-temperature side inlet of a first-stage cooler, a low-temperature side inlet of a second-stage cooler and a low-temperature side inlet of a last-stage cooler through a first valve 13, a low-temperature side outlet of the first-stage cooler, a low-temperature side outlet of the second-stage cooler and a low-temperature side outlet of the last-stage cooler are communicated with an inlet of a heat storage system hot tank 12, an outlet of the heat storage system hot tank 12 is communicated with a high-temperature side inlet of a first-stage heater, a high-temperature side inlet of a second-stage heater and a high-temperature side inlet of the last-stage heater through a second valve 14, and a high-temperature side outlet of the first-stage heater, a high-temperature side; the flexibility control device 16 receives the demand signal and is in circuit connection with the generator set 15, an external power grid, the multistage compressor and the multistage expander; the system is suitable for power plants with flexibility requirements and power plants needing stable output, can improve the quality of electric energy of the power plants, and improves the stability of a power system.
The flexibility control device 16 selects to use the power generation of the power generating set 15 or the power of the external power grid to drive the compressor according to the demand signal, or both the power generation and the power of the external power grid to drive the compressor.
The flexibility control device 16 controls the start and stop of the expansion machine according to the demand signal, and transmits the power generation capacity of the expansion machine to an external power grid.
Preferably, the multistage compressor is two-stage, namely a first-stage compressor 1 and a second-stage compressor 3, and the multistage cooler is two-stage, namely a first-stage cooler 2 and a second-stage cooler 4.
Preferably, the multistage heater is two-stage, namely a first-stage heater 7 and a second-stage heater 9, and the multistage expander is two-stage, namely a first-stage expander 8 and a second-stage expander 10.
The heat storage system cold tank 11 and the heat storage system hot tank 12 store heat generated in the process of compressing air, and are used for heating low-temperature air and then pushing the expansion machine to generate electricity in an energy release mode.
The peak regulation capacity and the response speed of the unit can be improved when the device is applied to a coal-fired power plant, the frequency modulation performance of the unit is improved, the stability of the electric output power can be improved when the device is applied to a photovoltaic power plant and a wind power plant, and the consumption capacity of a power grid to new energy is improved.
The operation method of the system for improving the flexibility of the electric power comprises an energy storage mode and an energy release mode, and specifically comprises the following steps:
an energy storage mode: when the generator set 15 needs to reduce the electric output power, the energy storage mode is started, the first valve 13 is opened, and the second valve 14 is closed; the flexibility control device 16 selects to use the generated energy of the generator set 15 or the electric energy of an external power grid to drive the multi-stage compressor according to a demand signal, or uses the two parts of electric energy at the same time, normal-temperature and normal-pressure air is compressed by the first-stage compressor and then enters the first-stage cooler, then is compressed by the second-stage compressor and then enters the second-stage cooler, until the air is compressed by the last-stage compressor and then enters the last-stage cooler to become normal-temperature and high-pressure air, the heat storage medium enters the first-stage cooler 2, the second-stage cooler 4 and the last-stage cooler from the heat storage system cold tank 11 through the first valve 13 to cool the air, the obtained high-temperature heat storage medium is stored in the heat storage system hot tank 12, the normal-temperature and;
energy release mode: when the power generator set 15 needs to increase the electric output power, the energy release mode is started, the first valve 13 is closed, and the second valve 14 is opened; the low-temperature liquid air flows out of the liquid air storage tank 6, normal-temperature high-pressure air generated after cold energy recovery is carried out by the gas-liquid conversion device 5 enters the first-stage heater for heating, the heated air enters the first-stage expander for power generation and then enters the second-stage heater for heating, the heated air enters the last-stage expander for power generation until entering the last-stage heater for heating, the outlet of the last-stage expander is normal-pressure normal-temperature air and is discharged into the surrounding environment, electric quantity is conveyed to an external power grid through the flexibility control device 16, high-temperature heat storage media enter the first-stage heater 7, the second-stage heater 9 and the last-stage heater for heating air from the heat storage system hot tank 12 through the second valve 14, and the obtained low-temperature heat storage media are stored in the heat storage system cold tank 11.
Compared with the prior art, the invention has the following advantages:
the air compressor, the air expander and the power generation equipment are coupled through the flexibility control device, the electric energy is stored through the working process of 'electric energy-compressor-air molecular potential energy-expander-electric energy', the electricity storage efficiency is high, the energy level loss caused by the fact that electricity of an electric boiler is converted into heat is avoided, compared with a water tank heat storage technology and a steam turbine steam flow process transformation technology, the regulating capacity and the application scene are expanded, compared with an electrochemical battery energy storage technology, the service life is prolonged, and the cost and the safety risk are reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure:
1-first-stage compressor 2-first-stage cooler 3-second-stage compressor 4-second-stage cooler 5-gas-liquid conversion device 6-liquid air storage tank 7-first-stage heater 8-first-stage expander 9-second-stage heater 10-second-stage expander 11-heat storage system cold tank 12-heat storage system hot tank 13-first valve 14-second valve 15-generator set 16-flexibility control device
Detailed Description
The present invention will be described in further detail with reference to the following drawings and detailed description, wherein the detailed description is given for illustrative purposes only and is not intended to limit the present invention.
As shown in fig. 1, the system for improving electric flexibility in this embodiment includes a primary compressor 1, a primary cooler 2, a secondary compressor 3, a secondary cooler 4, a gas-liquid conversion device 5, a liquid air storage tank 6, a primary heater 7, a primary expander 8, a secondary heater 9, a secondary expander 10, a heat storage system cold tank 11, a heat storage system hot tank 12, a first valve 13, a second valve 14, a generator set 15, and a flexibility control device 16.
An outlet of the primary compressor 1 is sequentially communicated with a high-temperature side inlet of a primary cooler 2, a high-temperature side outlet of the primary cooler 2, a secondary compressor 3, a high-temperature side inlet of a secondary cooler 4, a high-temperature side outlet of the secondary cooler 4, a cooling liquefaction side inlet of a gas-liquid conversion device 5, a cooling liquefaction side outlet of the gas-liquid conversion device 5 and an inlet of a liquid air storage tank 6; an outlet of the liquid air storage tank 6 is sequentially communicated with a cold energy recovery side inlet of the gas-liquid conversion device 5, a cold energy recovery side outlet of the gas-liquid conversion device 5, a low-temperature side inlet of the primary heater 7, a low-temperature side outlet of the primary heater 7, a primary expander 8, a low-temperature side inlet of the secondary heater 9, a low-temperature side outlet of the secondary heater 9 and a secondary expander 10; an outlet of a heat storage system cold tank 11 is communicated with a low-temperature side inlet of a primary cooler 2 and a low-temperature side inlet of a secondary cooler 4 through a first valve 13, a low-temperature side outlet of the primary cooler 2 and a low-temperature side outlet of the secondary cooler 4 are communicated with an inlet of a heat storage system hot tank 12, an outlet of the heat storage system hot tank 12 is communicated with a high-temperature side inlet of a primary heater 7 and a high-temperature side inlet of a secondary heater 9 through a second valve 14, and a high-temperature side outlet of the primary heater 7 and a high-temperature side outlet of the secondary heater 9 are connected with an inlet of the heat storage; the flexibility control device 16 receives the demand signal and is in circuit connection with the generator set 15, the external power grid, the primary compressor 1, the secondary compressor 3, the primary expander 8 and the secondary expander 10.
The system for improving the flexibility of the power can operate according to the following energy storage mode and energy release mode.
An energy storage mode: when the generator set 15 needs to reduce the electric output power, the energy storage mode is started, the first valve 13 is opened, and the second valve 14 is closed; the flexibility control device 16 selects to use the generated energy of the generator set 15 or the electric energy of an external power grid to drive the first-stage compressor 1 and the second-stage compressor 3 according to a demand signal, or uses the two electric quantities simultaneously, the normal-temperature and normal-pressure air enters the first-stage cooler 2 after being compressed by the first-stage compressor 1, and then enters the second-stage cooler 4 after being compressed by the second-stage compressor 3 to become the normal-temperature and high-pressure air, the heat storage medium enters the first-stage cooler 2 and the second-stage cooler 4 from the heat storage system cold tank 11 through the first valve 13 to cool the air, the obtained high-temperature heat storage medium is stored in the heat storage system hot tank 12, the normal-temperature and high-pressure air is.
Energy release mode: when the power generator set 15 needs to increase the electric output power, the energy release mode is started, the first valve 13 is closed, and the second valve 14 is opened; the low-temperature liquid air flows out from the liquid air storage tank 6, normal-temperature high-pressure air generated after cold energy recovery is carried out by the gas-liquid conversion device 5 enters the primary heater 7 for heating, the heated air enters the primary expander 8 for power generation and then enters the secondary heater 9 for heating, the heated air enters the secondary expander 10 for power generation, normal-pressure normal-temperature air is discharged from the outlet of the secondary expander 10 and is discharged into the surrounding environment, electric quantity is transmitted to an external power grid through the flexibility control device 16, a temperature heat storage medium enters the primary heater 7 and the secondary heater 9 from the heat storage system hot tank 12 through the second valve 14 for heating the air, and the obtained low-temperature heat storage medium is stored in the heat storage system cold tank 11 subsequently.
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 (8)
1. A system for increasing power flexibility, comprising: the system is composed of a multi-stage compressor, a multi-stage cooler, a gas-liquid conversion device (5), a liquid air storage tank (6), a multi-stage heater, a multi-stage expander, a heat storage system cold tank (11), a heat storage system hot tank (12), a first valve (13), a second valve (14), a generator set (15) and a flexibility control device (16);
the multistage compressors correspond to the multistage coolers one by one, and the corresponding coolers are connected in series behind each stage of compressor; the multistage heaters correspond to the multistage expanders one by one, and the corresponding expanders are connected in series behind each stage of heater; the outlet of the first-stage compressor is sequentially communicated with a high-temperature side inlet of a first-stage cooler, a high-temperature side outlet of the first-stage cooler, a second-stage compressor, a high-temperature side inlet of a second-stage cooler, a high-temperature side outlet of a second-stage cooler, a cooling liquefaction side inlet of the gas-liquid conversion device (5), a cooling liquefaction side outlet of the gas-liquid conversion device (5) and an inlet of a liquid air storage tank (6); an outlet of the liquid air storage tank (6) is sequentially communicated with a cold energy recovery side inlet of the gas-liquid conversion device (5), a cold energy recovery side outlet of the gas-liquid conversion device (5), a low-temperature side inlet of the first-stage heater, a low-temperature side outlet of the first-stage heater, the first-stage expander, a low-temperature side inlet of the second-stage heater, a low-temperature side outlet of the second-stage heater, the second-stage expander, a low-temperature side inlet of the heater to the last stage, a low-temperature side outlet of the last-stage heater and the; an outlet of a cold tank (11) of the heat storage system is communicated with a low-temperature side inlet of a first-stage cooler, a low-temperature side inlet of a second-stage cooler and a low-temperature side inlet of a last-stage cooler through a first valve (13), a low-temperature side outlet of the first-stage cooler, a low-temperature side outlet of the second-stage cooler and a low-temperature side outlet of the last-stage cooler are communicated with an inlet of a hot tank (12) of the heat storage system, an outlet of the hot tank (12) of the heat storage system is communicated with a high-temperature side inlet of a first-stage heater, a high-temperature side inlet of a second-stage heater and a high-temperature side inlet of the last-stage heater through a second valve (14), and a high-temperature side outlet of the first-stage heater, a high; the flexibility control device (16) receives the demand signal and is in circuit connection with the generator set (15), an external power grid, the multi-stage compressor and the multi-stage expander; the system is suitable for power plants with flexibility requirements and power plants needing stable output, can improve the quality of electric energy of the power plants, and improves the stability of a power system.
2. A system for increasing power flexibility as defined in claim 1, wherein: the flexibility control device (16) selects to use the power generation amount of the power generator set (15) or the electric quantity of an external power grid to drive the compressor according to the demand signal, or uses the two electric quantities to drive the compressor at the same time.
3. A system for increasing power flexibility as defined in claim 1, wherein: and the flexibility control device (16) controls the start and stop of the expansion machine according to the demand signal and transmits the power generation amount of the expansion machine to an external power grid.
4. A system for increasing power flexibility as defined in claim 1, wherein: the multistage compressor is two-stage, is one-level compressor (1) and second compressor (3) respectively, the multistage cooler is two-stage, is one-level cooler (2) and second cooler (4) respectively.
5. A system for increasing power flexibility as defined in claim 1, wherein: the multi-stage heater is two-stage, and is respectively a first-stage heater (7) and a second-stage heater (9), and the multi-stage expander is two-stage, and is respectively a first-stage expander (8) and a second-stage expander (10).
6. A system for increasing power flexibility as defined in claim 1, wherein: the heat storage system cold tank (11) and the heat storage system hot tank (12) store heat generated in the air compression process, and are used for heating low-temperature air and then pushing the expansion machine to generate electricity in the energy release mode.
7. A system for increasing power flexibility as defined in claim 1, wherein: the peak regulation capacity and the response speed of the unit can be improved when the device is applied to a coal-fired power plant, the frequency modulation performance of the unit is improved, the stability of the electric output power can be improved when the device is applied to a photovoltaic power plant and a wind power plant, and the consumption capacity of a power grid to new energy is improved.
8. A method of operating a system for increasing flexibility of electricity according to any one of claims 1 to 7, 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: when the generator set (15) needs to reduce the electric output power, the energy storage mode is started, the first valve (13) is opened, and the second valve (14) is closed; the flexibility control device (16) selects to use the generated energy of the generator set (15) or the electric energy of an external power grid to drive the multi-stage compressor according to a demand signal, or uses the two electric quantities simultaneously, normal-temperature and normal-pressure air enters the first-stage cooler after being compressed by the first-stage compressor, then enters the second-stage cooler after being compressed by the second-stage compressor until entering the final-stage cooler after being compressed by the final-stage compressor to become normal-temperature and high-pressure air, a heat storage medium enters the first-stage cooler (2), the second-stage cooler (4) and the final-stage cooler from the heat storage system cold tank (11) through the first valve (13) to cool the air, the obtained high-temperature heat storage medium is stored in the heat storage system hot tank (12), the normal-temperature and high-pressure air is cooled and liquefied through the gas-liquid conversion device;
energy release mode: when the power generator set (15) needs to improve the electric output power, the energy release mode is started, the first valve (13) is closed, and the second valve (14) is opened; the low-temperature liquid air flows out from a liquid air storage tank (6), normal-temperature high-pressure air generated after cold energy recovery is carried out by a gas-liquid conversion device (5) enters a first-stage heater for heating, the heated air enters a first-stage expander for power generation and then enters a second-stage heater for heating, the heated air enters a second-stage expander for power generation until entering a final-stage heater for heating, the heated air enters the final-stage expander for power generation, normal-pressure normal-temperature air is discharged into the surrounding environment at the outlet of the final-stage expander, electric quantity is transmitted to an external power grid through a flexibility control device (16), a high-temperature heat storage medium enters a first-stage heater (7) and a second-stage heater (9) from a heat storage system hot tank (12) through a second valve (14), until the final heater heats the air, the resulting low-temperature heat storage medium is then stored in the cold tank (11) of the heat storage system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653197A (en) * | 2020-12-16 | 2021-04-13 | 山西大学 | Coal-electricity internal heat circulation system and method for improving wind power consumption level thereof |
| CN113175426A (en) * | 2021-04-16 | 2021-07-27 | 西安热工研究院有限公司 | Advanced liquefied compressed air energy storage peak shaving system and method |
| CN113756893A (en) * | 2021-08-27 | 2021-12-07 | 北京工业大学 | Multi-unit combined operation flexibility adjusting system among multiple power plants |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100329903A1 (en) * | 2009-06-29 | 2010-12-30 | Lightsail Energy Inc. | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
| CN205422944U (en) * | 2015-12-16 | 2016-08-03 | 中国科学院工程热物理研究所 | Heat accumulation formula compressed air energy storage system |
| CN105863753A (en) * | 2016-05-23 | 2016-08-17 | 中国科学院理化技术研究所 | Closed cooling and power combined energy storage system |
| CN105888742A (en) * | 2016-06-02 | 2016-08-24 | 成都深冷液化设备股份有限公司 | Efficient liquid-air energy storage/release system |
| CN208024412U (en) * | 2018-01-17 | 2018-10-30 | 上海发电设备成套设计研究院有限责任公司 | A kind of compressed-air energy-storage system |
| CN108879745A (en) * | 2018-09-12 | 2018-11-23 | 党祺云 | A kind of comprehensive generating system and method improving peak load regulation economy |
| CN212054837U (en) * | 2020-03-20 | 2020-12-01 | 西安西热节能技术有限公司 | System for improving flexibility of electric power |
-
2020
- 2020-03-20 CN CN202010203405.0A patent/CN111271143A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100329903A1 (en) * | 2009-06-29 | 2010-12-30 | Lightsail Energy Inc. | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
| CN205422944U (en) * | 2015-12-16 | 2016-08-03 | 中国科学院工程热物理研究所 | Heat accumulation formula compressed air energy storage system |
| CN105863753A (en) * | 2016-05-23 | 2016-08-17 | 中国科学院理化技术研究所 | Closed cooling and power combined energy storage system |
| CN105888742A (en) * | 2016-06-02 | 2016-08-24 | 成都深冷液化设备股份有限公司 | Efficient liquid-air energy storage/release system |
| CN208024412U (en) * | 2018-01-17 | 2018-10-30 | 上海发电设备成套设计研究院有限责任公司 | A kind of compressed-air energy-storage system |
| CN108879745A (en) * | 2018-09-12 | 2018-11-23 | 党祺云 | A kind of comprehensive generating system and method improving peak load regulation economy |
| CN212054837U (en) * | 2020-03-20 | 2020-12-01 | 西安西热节能技术有限公司 | System for improving flexibility of electric power |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653197A (en) * | 2020-12-16 | 2021-04-13 | 山西大学 | Coal-electricity internal heat circulation system and method for improving wind power consumption level thereof |
| CN113175426A (en) * | 2021-04-16 | 2021-07-27 | 西安热工研究院有限公司 | Advanced liquefied compressed air energy storage peak shaving system and method |
| CN113756893A (en) * | 2021-08-27 | 2021-12-07 | 北京工业大学 | Multi-unit combined operation flexibility adjusting system among multiple power plants |
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