CN112302742B - Air energy storage system and method with peak regulation and stable combustion functions - Google Patents
Air energy storage system and method with peak regulation and stable combustion functions Download PDFInfo
- Publication number
- CN112302742B CN112302742B CN202011189255.9A CN202011189255A CN112302742B CN 112302742 B CN112302742 B CN 112302742B CN 202011189255 A CN202011189255 A CN 202011189255A CN 112302742 B CN112302742 B CN 112302742B
- Authority
- CN
- China
- Prior art keywords
- air
- valve
- oxygen
- outlet
- boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
-
- 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
-
- 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
- F01K13/02—Controlling, e.g. stopping or starting
-
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
-
- 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
- F01K21/00—Steam engine plants not otherwise provided for
-
- 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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
Abstract
The invention discloses an air energy storage system and method with peak regulation and stable combustion functions, wherein the system consists of a compressor, a cooler, a cold storage device, a separation device, an oxygen-enriched liquid-air storage tank, a boiler combustion system, a booster pump, a heater, an expansion machine, a unit thermal system and a control valve; according to the characteristics of liquefied air stored in the energy storage system, the stored air is purified air by oxygen-enriched liquid through a separation process, and the used oxygen-enriched purified air is sent to a boiler combustion system, so that the combustion condition in the boiler can be improved, the adaptability of the boiler to inferior coal is improved, the combustion efficiency can be improved, and the lowest stable combustion load of the boiler is reduced.
Description
Technical Field
The invention belongs to the technical field of energy storage peak regulation, and particularly relates to an air energy storage system and method with peak regulation and stable combustion functions, which are suitable for various thermal power plants typified by coal-fired units, can improve the adaptability of a boiler to inferior coal, improve the combustion efficiency, reduce the lowest stable combustion load of the boiler, and can improve 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 regulation technology of the conventional coal-fired unit, the invention provides an air energy storage system and method with the functions of peak regulation and stable combustion, which can reduce the stable combustion load of a boiler and improve the combustion efficiency of the boiler while improving the peak regulation capability of the unit, and have the advantages of long service life and low cost. The invention provides an air energy storage system with peak regulation and combustion stabilization functions, which can obviously improve the peak regulation capacity of a coal-fired unit, but can generate a large amount of purified air in the energy release process, and the purified air cannot be effectively stored due to large volume, so that resource waste is caused.
In order to achieve the purpose, the invention adopts the following technical scheme.
An air energy storage system with peak regulation and stable combustion functions comprises a first compressor 1, a first cooler 2, a second compressor 3, a first valve 4, a second cooler 5, a cold storage device 6, a second valve 7, a separation device 8, a third valve 9, a fourth valve 10, an oxygen-enriched liquid air storage tank 11, a fifth valve 12, a boiler combustion system 13, a sixth valve 14, a booster pump 15, a first heater 16, a first expander 17, a second heater 18, a second expander 19, a seventh valve 20, a unit thermodynamic system 21, an eighth valve 22, a ninth valve 23 and a tenth valve 24;
the outlet of the first compressor 1 is sequentially connected with the high-temperature side inlet of the first cooler 2, the high-temperature side outlet of the first cooler 2, the second compressor 3, the high-temperature side inlet of the second cooler 5, the high-temperature side outlet of the second cooler 5, the high-pressure air side inlet of the cold storage device 6, the high-pressure air side outlet of the cold storage device 6, the second valve 7 and the dry flow side inlet of the separation device 8; the high-temperature side outlet of the first cooler 2 is also sequentially connected with a low-pressure air side inlet of a cold storage device 6, a low-pressure air side outlet of the cold storage device 6 and an auxiliary flow side inlet of a separation device 8 through a first valve 4; a nitrogen-enriched air side outlet of the separation device 8 is sequentially connected with a nitrogen-enriched air side inlet of the cold storage device 6 and a nitrogen-enriched air side outlet of the cold storage device 6 through a third valve 9, and an oxygen-enriched air side outlet of the separation device 8 is connected with an inlet of an oxygen-enriched liquid air storage tank 11 through a fourth valve 10; an outlet of the oxygen-enriched liquid air storage tank 11 is sequentially connected with a low-pressure oxygen-enriched air side inlet of a cold storage device 6, a low-pressure oxygen-enriched air side outlet of the cold storage device 6 and an inlet of a boiler combustion system 13 through a fifth valve 12, and the outlet of the oxygen-enriched liquid air storage tank 11 is further sequentially connected with a booster pump 15, a high-pressure oxygen-enriched air side inlet of the cold storage device 6, a high-pressure oxygen-enriched air side outlet of the cold storage device 6, a low-temperature side inlet of a first heater 16, a low-temperature side outlet of the first heater 16, a first expander 17, a low-temperature side inlet of a second heater 18, a low-temperature side outlet of the second heater 18 and a second expander 19 through a sixth valve 14; the outlet of the second expansion machine 19 is respectively connected with a seventh valve 20 and a tenth valve 24, and the outlet of the second expansion machine 19 is connected with the inlet of the boiler combustion system 13 through the tenth valve 24; an outlet of a water side subsystem of the unit thermodynamic system 21 is respectively connected with a low-temperature side inlet of the first cooler 2 and a low-temperature side inlet of the second cooler 5 through an eighth valve 22, and a low-temperature side outlet of the first cooler 2 and a low-temperature side outlet of the second cooler 5 are connected with an inlet of the water side subsystem of the unit thermodynamic system 21; an outlet of a steam side subsystem of the unit thermodynamic system 21 is respectively connected with a high-temperature side inlet of the first heater 16 and a high-temperature side inlet of the second heater 18 through a ninth valve 23, and an outlet of the high-temperature side of the first heater 16 and an outlet of the high-temperature side of the second heater 18 are connected with an inlet of the steam side subsystem of the unit thermodynamic system 21; this system is based on the characteristic that energy storage system stored liquefied air, and design separator 8 makes the air of storing for oxygen-enriched liquid air-purifying, and used oxygen-enriched air-purifying is sent to boiler combustion system 13, can improve the combustion condition in the boiler, improves the boiler to the adaptability of inferior coal, can also improve combustion efficiency, reduce the minimum steady burning load of boiler.
And a sieve plate and an overflow weir are arranged in the separation device 8, liquid air on the dry flow side flows from top to bottom, gaseous air on the auxiliary flow side flows from bottom to top, after heat and mass exchange of gas and liquid occurs, the low-boiling-point components are gradually evaporated, and the high-boiling-point components are gradually liquefied.
The nitrogen-rich air separated by the separation device 8 is discharged after cold energy is recovered by the cold storage device 6, and the nitrogen-rich air can also be used for boiler soot blowing and instrument air control systems.
The liquid air stored in the oxygen-enriched liquid air storage tank 11 can be directly sent to the boiler combustion system 13 after cold energy is recovered by the cold storage device 6, and also can be sent to the boiler combustion system 13 after pressurization, temperature rise, expansion and work done.
The oxygen-enriched air at the outlet of the second expander 19 is directly sent to the boiler combustion system 13, and when the oxygen-enriched air cannot be completely consumed, the oxygen-enriched air can be discharged into the environment through a seventh valve 20.
The boiler combustion system 13 improves the combustion conditions in the boiler when oxygen enriched air is used.
The plant thermal system 21 cools the air in the first cooler 2 and the second cooler 5 during the energy storage process and heats the air in the first heater 16 and the second heater 18 during the energy release process.
The system designs the separating device to enable the stored air to be the oxygen-enriched liquid purified air, the used oxygen-enriched purified air is sent to the boiler combustion system, the combustion condition in the boiler can be improved, the adaptability of the boiler to the inferior coal is improved, the combustion efficiency can be improved, the lowest stable combustion load of the boiler is reduced, and the system has good economical efficiency.
The operation method of the air energy storage system with the peak regulation and combustion stabilization functions 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 the power generation load of a coal-fired unit is required to be reduced, an energy storage mode is started, a first valve 4, a second valve 7, a third valve 9, a fourth valve 10 and an eighth valve 22 are opened, and a sixth valve 14, a seventh valve 20, a ninth valve 23 and a tenth valve 24 are closed; the method comprises the steps that the first compressor 1 and the second compressor 3 are driven to rotate by electric energy of a coal-fired unit, air enters the first cooler 2 for cooling after being pressurized by the first compressor 1, one part of air enters the lower part of the separation device 8 after being cooled by the cold storage device 6, the other part of air enters the second compressor 3 for pressurizing, then sequentially enters the second cooler 5 and the cold storage device 6 for cooling, and liquefied air enters the upper part of the separation device 8 after being throttled by the second valve 7; the nitrogen-rich air separated by the separation device 8 is discharged after cold energy is recovered by the cold storage device 6, and the separated oxygen-rich liquid air enters the oxygen-rich liquid air storage tank 11 through the fourth valve 10 for storage; the water side subsystem in the unit thermodynamic system 21 sends warm water to the first cooler 2 and the second cooler 5 to cool the compressed air, and then returns to the water side subsystem; when the generating load of the unit needs to be further reduced, the fifth valve 12 can be opened, and the oxygen-enriched liquid air is sent to the boiler combustion system 13 after cold energy is recovered by the cold storage device 6, so that the minimum stable combustion load of the boiler can be reduced, and the peak regulation capacity of the coal-fired unit is further improved;
energy release mode: when the power consumption of a power grid is high and a coal-fired unit is required to lift the power generation load, the energy release mode is started, the first valve 4, the second valve 7, the third valve 9, the fourth valve 10, the fifth valve 12 and the eighth valve 22 are closed, and the sixth valve 14, the ninth valve 23 and the tenth valve 24 are opened; oxygen-enriched liquid air flows out of an oxygen-enriched liquid air storage tank 11, the pressure of the oxygen-enriched liquid air is increased by a booster pump 15, the oxygen-enriched liquid air enters a cold storage device 6 to recover cold energy, the obtained normal-temperature high-pressure air sequentially enters a first heater 16, a first expander 17, a second heater 18 and a second expander 19, the air in the first heater 16 and the second heater 18 absorbs heat and is heated, the air is expanded in the first expander 17 and the second expander 19 to output useful work, the oxygen-enriched air at normal temperature and normal pressure is obtained at an outlet of the second expander 19 and is sent to a boiler combustion system 13 through a tenth valve 24, the combustion condition in a boiler can be improved, the adaptability of the boiler to poor-quality coal is improved, and the combustion efficiency can be improved; a steam side subsystem in the unit thermodynamic system 21 sends low-pressure steam to the first heater 16 and the second heater 18 to heat and compress air, and the compressed air is drained and then returns to the steam side subsystem, so that the work capacity of the air is improved; when the boiler combustion system 13 cannot consume all the oxygen-enriched air at the outlet of the second expander 19, the seventh valve 20 is opened to discharge the excess oxygen-enriched air to the environment.
Compared with the prior art, the invention has the following advantages:
the invention relates to an air energy storage system and a method with peak regulation and stable combustion functions, which are suitable for various thermal power plants typified by coal-fired units.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure:
1-first compressor 2-first cooler 3-second compressor 4-first valve
5-second cooler 6-cold storage device 7-second valve 8-separation device
9-third valve 10-fourth valve 11-oxygen-enriched liquid air storage tank 12-fifth valve
13-boiler combustion system 14-sixth valve 15-booster pump 16-first heater
17-first expander 18-second heater 19-second expander 20-seventh valve
21-unit thermodynamic system 22-eighth valve 23-ninth valve 24-tenth 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 air energy storage system with peak regulation and stable combustion functions of the present invention is composed of a first compressor 1, a first cooler 2, a second compressor 3, a first valve 4, a second cooler 5, a cold storage device 6, a second valve 7, a separation device 8, a third valve 9, a fourth valve 10, an oxygen-rich liquid-air storage tank 11, a fifth valve 12, a boiler combustion system 13, a sixth valve 14, a booster pump 15, a first heater 16, a first expander 17, a second heater 18, a second expander 19, a seventh valve 20, a unit thermal system 21, an eighth valve 22, a ninth valve 23, and a tenth valve 24.
An outlet of the first compressor 1 is sequentially connected with a high-temperature side inlet of the first cooler 2, a high-temperature side outlet of the first cooler 2, the second compressor 3, a high-temperature side inlet of the second cooler 5, a high-temperature side outlet of the second cooler 5, a high-pressure air side inlet of the cold storage device 6, a high-pressure air side outlet of the cold storage device 6, a second valve 7 and a main flow side inlet of the separation device 8; the high-temperature side outlet of the first cooler 2 is also sequentially connected with a low-pressure air side inlet of a cold storage device 6, a low-pressure air side outlet of the cold storage device 6 and an auxiliary flow side inlet of a separation device 8 through a first valve 4; a nitrogen-enriched air side outlet of the separation device 8 is sequentially connected with a nitrogen-enriched air side inlet of the cold storage device 6 and a nitrogen-enriched air side outlet of the cold storage device 6 through a third valve 9, and an oxygen-enriched air side outlet of the separation device 8 is connected with an inlet of an oxygen-enriched liquid air storage tank 11 through a fourth valve 10; an outlet of the oxygen-enriched liquid air storage tank 11 is sequentially connected with a low-pressure oxygen-enriched air side inlet of a cold storage device 6, a low-pressure oxygen-enriched air side outlet of the cold storage device 6 and an inlet of a boiler combustion system 13 through a fifth valve 12, and the outlet of the oxygen-enriched liquid air storage tank 11 is further sequentially connected with a booster pump 15, a high-pressure oxygen-enriched air side inlet of the cold storage device 6, a high-pressure oxygen-enriched air side outlet of the cold storage device 6, a low-temperature side inlet of a first heater 16, a low-temperature side outlet of the first heater 16, a first expander 17, a low-temperature side inlet of a second heater 18, a low-temperature side outlet of the second heater 18 and a second expander 19 through a sixth valve 14; the outlet of the second expansion machine 19 is respectively connected with a seventh valve 20 and a tenth valve 24, and the outlet of the second expansion machine 19 is connected with the inlet of the boiler combustion system 13 through the tenth valve 24; the outlet of the water side subsystem of the unit thermodynamic system 21 is respectively connected with the inlet of the low-temperature side of the first cooler 2 and the inlet of the low-temperature side of the second cooler 5 through an eighth valve 22, and the outlet of the low-temperature side of the first cooler 2 and the outlet of the low-temperature side of the second cooler 5 are connected with the inlet of the water side subsystem of the unit thermodynamic system 21; an outlet of a steam side subsystem of the unit thermodynamic system 21 is respectively connected with a high-temperature side inlet of the first heater 16 and a high-temperature side inlet of the second heater 18 through a ninth valve 23, and an outlet of the high-temperature side of the first heater 16 and an outlet of the high-temperature side of the second heater 18 are connected with an inlet of the steam side subsystem of the unit thermodynamic system 21; this system is based on the characteristic that energy storage system stored liquefied air, and design separator 8 makes the air of storing for oxygen-enriched liquid air-purifying, and used oxygen-enriched air-purifying is sent to boiler combustion system 13, can improve the combustion condition in the boiler, improves the boiler to the adaptability of inferior coal, can also improve combustion efficiency, reduce the minimum steady burning load of boiler.
The air energy storage system with the peak regulation and combustion stabilization functions can operate according to the following energy storage mode and energy release mode.
An energy storage mode: the method comprises the steps that when the power consumption of a power grid is low and the power generation load of a coal-fired unit is required to be reduced, an energy storage mode is started, a first valve 4, a second valve 7, a third valve 9, a fourth valve 10 and an eighth valve 22 are opened, and a sixth valve 14, a seventh valve 20, a ninth valve 23 and a tenth valve 24 are closed; the method comprises the steps that the electric energy of a coal-fired unit is utilized to drive a first compressor 1 and a second compressor 3 to rotate, air enters a first cooler 2 for cooling after the pressure of the air is increased by the first compressor 1, one part of air enters the lower part of a separation device 8 after being cooled by a cold storage device 6, the other part of air enters a second compressor 3 for increasing the pressure of the air and then sequentially enters a second cooler 5 and the cold storage device 6 for cooling, and liquefied air enters the upper part of the separation device 8 after being throttled by a second valve 7; the nitrogen-enriched air separated by the separation device 8 is discharged after cold energy is recovered by the cold storage device 6, and the separated oxygen-enriched liquid air enters the oxygen-enriched liquid air storage tank 11 through the fourth valve 10 for storage; the water side subsystem in the unit thermodynamic system 21 sends the warm water to the first cooler 2 and the second cooler 5 to cool the compressed air, and then returns to the water side subsystem; when the unit needs to further reduce the power generation load, the fifth valve 12 can be opened, and the oxygen-enriched liquid air is sent to the boiler combustion system 13 after cold energy is recovered by the cold storage device 6, so that the minimum stable combustion load of the boiler can be reduced, and the peak regulation capacity of the coal-fired unit is further improved.
Energy release mode: when the power consumption of a power grid is in a peak and a coal-fired unit is needed to lift the power generation load, the energy release mode is started, the first valve 4, the second valve 7, the third valve 9, the fourth valve 10, the fifth valve 12 and the eighth valve 22 are closed, and the sixth valve 14, the ninth valve 23 and the tenth valve 24 are opened; oxygen-enriched liquid air flows out of an oxygen-enriched liquid air storage tank 11, the pressure of the oxygen-enriched liquid air is raised by a booster pump 15, the oxygen-enriched liquid air enters a cold storage device 6, cold energy is recovered, the obtained normal-temperature high-pressure air sequentially enters a first heater 16, a first expander 17, a second heater 18 and a second expander 19, the air in the first heater 16 and the second heater 18 absorbs heat and heats up, useful work is output by expansion in the first expander 17 and the second expander 19, the oxygen-enriched air at normal temperature and normal pressure is obtained at an outlet of the second expander 19 and is sent to a boiler combustion system 13 through a tenth valve 24, the combustion condition in a boiler can be improved, the adaptability of the boiler to poor-quality coal is improved, and the combustion efficiency can also be improved; a steam side subsystem in the unit thermodynamic system 21 sends low-pressure steam to the first heater 16 and the second heater 18 to heat and compress air, and the compressed air is drained and then returns to the steam side subsystem, so that the work capacity of the air is improved; when the boiler combustion system 13 cannot consume all the oxygen-enriched air at the outlet of the second expander 19, the seventh valve 20 is opened to discharge the excess oxygen-enriched air to the environment.
While the present invention has been described in connection with the appended drawings, the foregoing description is intended to illustrate and not limit the invention, and it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention. Any insubstantial changes from the disclosed concepts are intended to be covered by the claims.
Claims (7)
1. The utility model provides an air energy storage system who possesses peak regulation and surely fire function which characterized in that: the system is composed of a first compressor (1), a first cooler (2), a second compressor (3), a first valve (4), a second cooler (5), a cold storage device (6), a second valve (7), a separation device (8), a third valve (9), a fourth valve (10), an oxygen-enriched liquid air storage tank (11), a fifth valve (12), a boiler combustion system (13), a sixth valve (14), a booster pump (15), a first heater (16), a first expander (17), a second heater (18), a second expander (19), a seventh valve (20), a unit thermal system (21), an eighth valve (22), a ninth valve (23) and a tenth valve (24);
the outlet of the first compressor (1) is sequentially connected with the high-temperature side inlet of the first cooler (2), the high-temperature side outlet of the first cooler (2), the second compressor (3), the high-temperature side inlet of the second cooler (5), the high-temperature side outlet of the second cooler (5), the high-pressure air side inlet of the cold storage device (6), the high-pressure air side outlet of the cold storage device (6), the second valve (7) and the main flow side inlet of the separation device (8); the high-temperature side outlet of the first cooler (2) is also sequentially connected with the low-pressure air side inlet of the cold storage device (6), the low-pressure air side outlet of the cold storage device (6) and the auxiliary flow side inlet of the separation device (8) through a first valve (4); a nitrogen-rich air side outlet of the separation device (8) is sequentially connected with a nitrogen-rich air side inlet of the cold storage device (6) and a nitrogen-rich air side outlet of the cold storage device (6) through a third valve (9), and an oxygen-rich air side outlet of the separation device (8) is connected with an inlet of an oxygen-rich liquid air storage tank (11) through a fourth valve (10); an outlet of the oxygen-enriched liquid air storage tank (11) is sequentially connected with a low-pressure oxygen-enriched air side inlet of the cold storage device (6), a low-pressure oxygen-enriched air side outlet of the cold storage device (6) and an inlet of a boiler combustion system (13) through a fifth valve (12), and an outlet of the oxygen-enriched liquid air storage tank (11) is further sequentially connected with a booster pump (15), a high-pressure oxygen-enriched air side inlet of the cold storage device (6), a high-pressure oxygen-enriched air side outlet of the cold storage device (6), a low-temperature side inlet of the first heater (16), a low-temperature side outlet of the first heater (16), the first expander (17), a low-temperature side inlet of the second heater (18), a low-temperature side outlet of the second heater (18) and the second expander (19) through a sixth valve (14); an outlet of the second expansion machine (19) is respectively connected with a seventh valve (20) and a tenth valve (24), and an outlet of the second expansion machine (19) is connected with an inlet of the boiler combustion system (13) through the tenth valve (24); an outlet of a water side subsystem of the unit thermodynamic system (21) is connected with a low-temperature side inlet of the first cooler (2) and a low-temperature side inlet of the second cooler (5) through an eighth valve (22), and an outlet of the low-temperature side of the first cooler (2) and an outlet of the low-temperature side of the second cooler (5) are connected with an inlet of the water side subsystem of the unit thermodynamic system (21); an outlet of a steam side subsystem of the unit thermodynamic system (21) is respectively connected with a high-temperature side inlet of the first heater (16) and a high-temperature side inlet of the second heater (18) through a ninth valve (23), and an outlet of the high-temperature side of the first heater (16) and an outlet of the high-temperature side of the second heater (18) are connected with an inlet of the steam side subsystem of the unit thermodynamic system (21); the system is based on the characteristic that an energy storage system stores liquefied air, a separation device (8) is designed to enable the stored air to be oxygen-enriched liquid purified air, and the used oxygen-enriched purified air is sent to a boiler combustion system (13), so that the combustion condition in a boiler can be improved, the adaptability of the boiler to inferior coal can be improved, the combustion efficiency can be improved, and the lowest stable combustion load of the boiler can be reduced;
the operation method of the air energy storage system with the peak regulation and combustion stabilization functions 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 the power generation load of a coal-fired unit is required to be reduced, an energy storage mode is started, a first valve (4), a second valve (7), a third valve (9), a fourth valve (10) and an eighth valve (22) are opened, and a sixth valve (14), a seventh valve (20), a ninth valve (23) and a tenth valve (24) are closed; the method comprises the steps that the first compressor (1) and the second compressor (3) are driven to rotate by electric energy of a coal-fired unit, air enters the first cooler (2) for cooling after being pressurized by the first compressor (1), one part of air enters the lower part of the separation device (8) after being cooled by the cold storage device (6), the other part of air enters the second compressor (3) for pressurizing, then sequentially enters the second cooler (5) and the cold storage device (6) for cooling, and liquefied air enters the upper part of the separation device (8) after being throttled by the second valve (7); the nitrogen-enriched air separated by the separation device (8) is discharged after cold energy is recovered by the cold storage device (6), and the separated oxygen-enriched liquid air enters the oxygen-enriched liquid air storage tank (11) for storage through the fourth valve (10); a water side subsystem in the unit thermodynamic system (21) sends warm water to a first cooler (2) and a second cooler (5) to cool compressed air, and then returns to the water side subsystem; when the generating load of the unit needs to be further reduced, the fifth valve (12) is opened, the oxygen-enriched liquid air is sent to a boiler combustion system (13) after cold energy is recovered by the cold storage device (6), the minimum stable combustion load of the boiler can be reduced, and the peak regulation capacity of the coal-fired unit is further improved;
energy release mode: the method comprises the steps that when the power consumption of a power grid is in a peak and a power generation load of a coal-fired unit needs to be lifted, an energy releasing mode is started, a first valve (4), a second valve (7), a third valve (9), a fourth valve (10), a fifth valve (12) and an eighth valve (22) are closed, and a sixth valve (14), a ninth valve (23) and a tenth valve (24) are opened; oxygen-enriched liquid air flows out of an oxygen-enriched liquid air storage tank (11), the pressure of the oxygen-enriched liquid air is raised by a booster pump (15), the oxygen-enriched liquid air enters a cold storage device (6) to recover cold energy, the obtained normal-temperature high-pressure air sequentially enters a first heater (16), a first expander (17), a second heater (18) and a second expander (19), the air in the first heater (16) and the second heater (18) absorbs heat and heats, the first expander (17) and the second expander (19) expand to output useful work, the oxygen-enriched air at normal temperature and normal pressure is obtained at the outlet of the second expander (19) and sent to a boiler combustion system (13) through a tenth valve (24), the combustion condition in a boiler can be improved, the adaptability of the boiler to low-quality coal is improved, and the combustion efficiency can also be improved; a steam side subsystem in the unit thermodynamic system (21) sends low-pressure steam to a first heater (16) and a second heater (18) to heat and compress air, and drainage is returned to the steam side subsystem, so that the working capacity of the air is improved; when the boiler combustion system (13) can not consume all the oxygen-enriched air at the outlet of the second expander (19), the seventh valve (20) is opened to discharge the redundant oxygen-enriched air to the environment.
2. The air energy storage system with the peak shaving and combustion stabilizing functions as claimed in claim 1, wherein: and a sieve plate and an overflow weir are arranged in the separation device (8), liquid air on the dry flow side flows from top to bottom, gaseous air on the auxiliary flow side flows from bottom to top, after heat and mass exchange of gas and liquid occurs, the low-boiling-point components are gradually evaporated, and the high-boiling-point components are gradually liquefied.
3. The air energy storage system with the peak shaving and combustion stabilizing functions as claimed in claim 1, wherein: the nitrogen-rich air separated by the separation device (8) is discharged after cold energy is recovered by the cold storage device (6), and the nitrogen-rich air can also be used for boiler soot blowing and instrument air control systems.
4. The air energy storage system with the peak shaving and combustion stabilizing functions as claimed in claim 1, wherein: the liquid air stored in the oxygen-enriched liquid air storage tank (11) can be directly sent to a boiler combustion system (13) after cold energy is recovered through the cold storage device (6), and can also be sent to the boiler combustion system (13) after pressurization, temperature rise and expansion work.
5. The air energy storage system with the peak shaving and combustion stabilizing functions as claimed in claim 1, wherein: the oxygen-enriched air at the outlet of the second expander (19) is directly sent to a boiler combustion system (13), and when the oxygen-enriched air cannot be completely consumed, the oxygen-enriched air can be discharged into the environment through a seventh valve (20).
6. The air energy storage system with peak regulation and stable combustion functions as claimed in claim 1, characterized in that: the boiler combustion system (13) improves the combustion conditions in the boiler when oxygen-enriched air is used.
7. The air energy storage system with peak regulation and stable combustion functions as claimed in claim 1, characterized in that: the unit thermodynamic system (21) cools air in the first cooler (2) and the second cooler (5) during energy storage and heats air in the first heater (16) and the second heater (18) during energy release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011189255.9A CN112302742B (en) | 2020-10-30 | 2020-10-30 | Air energy storage system and method with peak regulation and stable combustion functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011189255.9A CN112302742B (en) | 2020-10-30 | 2020-10-30 | Air energy storage system and method with peak regulation and stable combustion functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112302742A CN112302742A (en) | 2021-02-02 |
| CN112302742B true CN112302742B (en) | 2022-11-04 |
Family
ID=74333461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011189255.9A Active CN112302742B (en) | 2020-10-30 | 2020-10-30 | Air energy storage system and method with peak regulation and stable combustion functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112302742B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339774B (en) * | 2021-04-29 | 2023-06-16 | 华电电力科学研究院有限公司 | Multi-energy combined supply system based on cascade utilization of steam of thermoelectric unit and adjusting method |
| CN114856735B (en) * | 2022-04-25 | 2023-11-17 | 中国能源建设集团江苏省电力设计院有限公司 | Air turbine coupling gas turbine power generation system based on compressed air energy storage |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4361009A (en) * | 1979-10-31 | 1982-11-30 | The Babcock & Wilcox Company | Moving bed heat storage and recovery system |
| JPH11343865A (en) * | 1998-06-02 | 1999-12-14 | Mitsubishi Heavy Ind Ltd | Cryogenic turbine power generation system |
| US20080178601A1 (en) * | 2007-01-25 | 2008-07-31 | Michael Nakhamkin | Power augmentation of combustion turbines with compressed air energy storage and additional expander with airflow extraction and injection thereof upstream of combustors |
| CN104279012B (en) * | 2013-07-04 | 2016-02-03 | 中国科学院过程工程研究所 | A kind of nuclear power peak regulation system based on deep cooling energy storage |
| CN104420996A (en) * | 2013-08-30 | 2015-03-18 | 中国科学院工程热物理研究所 | Liquid air energy accumulation system |
| WO2018128803A1 (en) * | 2017-01-03 | 2018-07-12 | Conlon William M | Cryogenic combined cycle power plant |
| CN207018038U (en) * | 2017-02-11 | 2018-02-16 | 祝长宇 | A kind of liquid air energy storage combines energy resource system with coal fired power generation |
| CN108979762B (en) * | 2017-06-01 | 2020-12-15 | 中国科学院工程热物理研究所 | Staged cold accumulation type supercritical compressed air energy storage system and method |
| CN109546670A (en) * | 2018-12-29 | 2019-03-29 | 西安西热节能技术有限公司 | A kind of air energy storage peak shaving system applied to Thermal generation unit |
| CN210977616U (en) * | 2019-11-27 | 2020-07-10 | 中国科学院工程热物理研究所 | Supercritical compressed air energy storage system |
| CN111305918A (en) * | 2020-03-20 | 2020-06-19 | 西安西热节能技术有限公司 | Steam-driven air energy storage and peak regulation system and method without cold source loss |
| CN111305919A (en) * | 2020-03-20 | 2020-06-19 | 西安西热节能技术有限公司 | Power plant air energy storage flexible peak regulation system and method |
-
2020
- 2020-10-30 CN CN202011189255.9A patent/CN112302742B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112302742A (en) | 2021-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2500565B1 (en) | Supercritical air energy storage system | |
| CN111305919A (en) | Power plant air energy storage flexible peak regulation system and method | |
| CN112963207B (en) | Liquefied air hybrid energy storage and power generation integrated system and method | |
| CN111928511B (en) | Liquefied air energy storage peak shaving system and method based on compressor intermediate suction | |
| CN111305920B (en) | Steam-driven air energy storage peak shaving system and method | |
| CN112302742B (en) | Air energy storage system and method with peak regulation and stable combustion functions | |
| CN109812304B (en) | Peak regulation power generation system and method integrating carbon dioxide circulation and liquefied air energy storage | |
| CN112178615B (en) | Electric-steam-air cooling multi-combined supply system based on liquid compressed air energy storage system | |
| CN111305918A (en) | Steam-driven air energy storage and peak regulation system and method without cold source loss | |
| CN111022139A (en) | Coal-fired generating set coupling liquefied air energy storage power generation system | |
| CN212054838U (en) | Steam concurrent heating air energy storage peak shaving system | |
| CN112302746A (en) | Air energy storage system and method for efficiently utilizing compression heat | |
| CN211900716U (en) | Steam-driven air energy storage peak regulation system without cold source loss | |
| CN212054836U (en) | Power plant air energy storage flexibility peak shaving system | |
| CN111271143A (en) | System and method for improving electric power flexibility | |
| CN212054842U (en) | Steam-driven air energy storage peak shaving system | |
| CN113565684A (en) | Power generation method and system for realizing new energy storage through carbon dioxide liquefaction | |
| CN209875220U (en) | Peak-shaving power generation system integrating carbon dioxide circulation and liquefied air energy storage | |
| CN109944650B (en) | Combined cooling, heating and power system and method containing supercritical compressed air energy storage | |
| CN114033516B (en) | Liquid compressed air energy storage method and system for coupling high-back-pressure heat supply unit | |
| CN215860603U (en) | Power generation system for realizing new energy storage by carbon dioxide liquefaction | |
| CN212406823U (en) | Steam-electricity dual-drive power generation system for energy storage of liquid compressed air of coal-fired unit | |
| CN212406821U (en) | Steam-drive liquid compressed air energy storage peak shaving system based on low-pressure cylinder zero-output technology | |
| CN113803959A (en) | Household gas water heater coupling liquefied air energy storage reactor system and operation method | |
| CN111928525A (en) | Liquefied air energy storage peak regulation system and method based on waste heat refrigeration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |