CN115788745A - Water pumping compressed air energy storage system with adjustable water head and operation method - Google Patents
Water pumping compressed air energy storage system with adjustable water head and operation method Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of physical energy storage, in particular to a water pumping compressed air energy storage system with an adjustable water head and an operation method. The technical scheme of the invention comprises a pumped storage power generation system, an adjustable pressure compressed air system and a heat storage system; the pumped storage power generation system comprises a lower reservoir, a reversible water-turbine generator set and at least one gas-liquid common holding tank, wherein the interior of the gas-liquid common holding tank is divided into a water chamber and a gas chamber which can change volume by a movable piston sealing device, and the bottom of the lower reservoir is sequentially connected with the water chambers of the reversible water-turbine generator set and the gas-liquid common holding tank through a pipeline and a valve; during energy storage, the reversible water turbine generator set pressurizes and conveys water in the lower reservoir to the water chamber; when the energy is released to generate electricity, the high-pressure water in the water chamber enters the reversible water turbine generator set to generate electricity and is discharged into the lower reservoir.
Description
Technical Field
The invention relates to the technical field of physical energy storage, in particular to a water pumping compressed air energy storage system with an adjustable water head and an operation method.
Background
The scale of the wind power, photovoltaic and other new energy power generation installed devices is increased explosively, however, with the increase of the scale of the wind power, photovoltaic and other installed devices on the whole power supply side, the intermittent, random and fluctuating properties of the wind power and photovoltaic power generation will bring huge impact to the power grid, and the safe and stable operation of the power grid is seriously affected. The large-scale energy storage is an important way for establishing a novel power system and ensuring the safe operation of a power grid. The pumped storage power generation and compressed air energy storage power generation technology is a relatively mature large-scale energy storage technology. In the process of construction and operation of the pumped storage power station, natural resources, ecological environment and landscape environment can be damaged. The compressed air energy storage power generation technology needs underground gas storage caves and is limited by geographical conditions. In order to get rid of geographical condition limitation, scholars at home and abroad propose a pumped storage and compressed air energy storage technology which combines pumped storage and compressed air energy storage technologies, but have the problems of water storage pressure fluctuation, stored air pressure fluctuation, large water turbine head amplitude variation, uncontrollable unit output in the energy release process and the like.
In order to solve the problems, the application provides a water pumping compressed air energy storage system with an adjustable water head, the functions of enabling a unit to output continuous and stable power, controlling output, solving the problem of amplitude variation of the water head and the like are achieved, and a new idea is provided for popularization and application of a water pumping compressed air energy storage technology.
Disclosure of Invention
The invention aims to provide a novel energy storage technology combining compressed air energy storage and pumped storage power generation technology, which solves the problem that pumped storage and compressed air storage are limited by geographical positions, and simultaneously solves the problem that water storage and air storage fluctuate in the energy storage process.
The technical scheme adopted by the invention is as follows: a water pumping compressed air energy storage system with an adjustable water head comprises a water pumping energy storage power generation system, an adjustable pressure compressed air system and a heat storage system;
the pumped storage power generation system comprises a lower reservoir, a reversible water turbine generator set and at least one gas-liquid co-containing tank, wherein the gas-liquid co-containing tank is internally divided into a water chamber and an air chamber with variable volumes by a movable piston sealing device, and the bottom of the lower reservoir is sequentially connected with the water chambers of the reversible water turbine generator set and the gas-liquid co-containing tank through a pipeline and a valve; when energy is stored, the reversible water turbine generator set pressurizes and conveys water in the lower reservoir to the water chamber; when the energy is released for power generation, high-pressure water in the water chamber enters the reversible water-turbine generator set for power generation and is discharged into a lower reservoir;
the pressure-adjustable compressed air system comprises at least one gas-liquid co-containing tank, at least one air storage tank and an air inlet unit; the air chamber of the gas-liquid co-containing tank is connected with the air storage tank through a communicating pipe; when the energy is released and the power is generated, compressed air is discharged from the air storage tank to the gas-liquid co-containing tank; when the output of the reversible water-turbine generator set needs to be adjusted, the air inlet unit is used for inflating the air chamber to adjust the air pressure in the air chamber;
the heat storage system comprises a cold water storage tank, a first circulating water pump, an air cooler, a hot water storage tank, a second circulating water pump and an air heater which are sequentially connected into a circulating loop through a pipeline and a valve, wherein the air cooler and the air heater are respectively connected to two branch pipes of the communicating pipe; when energy is stored, air in the air chamber is pressed into the air storage tank, heat in the air compression process is exchanged to circulating water through the air cooler, and the circulating water is stored in the heat storage water tank; when the energy is released and the power is generated, the compressed air in the air storage tank enters the air chamber, and the heat in the hot water storage tank is transferred to the compressed air through the air heater.
Preferably, the air inlet unit comprises an air inlet filtering device, an air compressor and a surge tank which are connected in sequence, and an outlet of the surge tank is communicated with the communicating pipe through a valve.
Preferably, the maximum pressure bearing value of the at least one gas-liquid co-container tank and the at least one gas storage tank is greater than or equal to 4MPa.
Preferably, when the number of the gas-liquid co-containing tanks and the number of the gas storage tanks are greater than or equal to two, the gas-liquid co-containing tanks and the gas-liquid co-containing tanks, and the gas storage tanks and the gas-liquid co-containing tanks are arranged at intervals, and all the gas-liquid co-containing tanks and the gas storage tanks are on the same horizontal plane.
Preferably, an exhaust valve is arranged at the lowest water level of the gas-liquid co-container tank.
The invention also provides an operation method of the water pumping compressed air energy storage system with the adjustable water head, which is characterized by comprising the following steps of:
(1) Preparation work:
before the system operates, water in the lower reservoir is injected into a water chamber of the gas-liquid common-holding tank through the reversible water turbine generator set, and water injection is stopped after the lowest water level is reached; then, injecting compressed air into the air storage tank and the air chambers in the gas-liquid co-containing tank through the air inlet unit to enable the air pressures in the air storage tank and the air chambers to reach set values; meanwhile, a first circulating water pump is started to convey cold water in the cold water storage tank to the hot water storage tank, and heat of compressed air is absorbed through an air cooler;
(2) Energy storage process:
when the system stores energy, water in a lower reservoir is continuously injected into the water chamber through the reversible water turbine generator set, compressed air in the air chamber is continuously compressed when the piston sealing device moves upwards in the gas-liquid common tank, compressed air is injected into the air storage tank through the communicating pipe, when the piston sealing device reaches the highest water level point, water injection is stopped, the air storage pressure is finely adjusted through the air inlet unit, and finally the designed air storage pressure value is reached; in the process that compressed air in the air chamber flows to the air storage tank, cold water in the cold water storage tank is conveyed to the hot water storage tank through the first circulating water pump, and heat of the compressed air is absorbed through the air cooler;
(3) The energy release process is as follows:
when the system releases energy, the reversible water-turbine generator set is started, and high-pressure water stored in the water chamber pushes the reversible water-turbine generator set to generate electricity and then is discharged into a lower reservoir; meanwhile, compressed air in the air storage tank continuously enters the air chamber, and when the piston sealing device reaches the lowest water level, the energy release process is finished;
(4) And (3) regulating a water head process:
when the system releases energy, the high-pressure water stored in the water chamber pushes the reversible water turbine generator set to generate electricity and then is discharged into a lower reservoir; meanwhile, the compressed air in the air storage tank continuously enters the air chamber, the air pressure of the air chamber continuously decreases along with the continuous decrease of the piston sealing device, and the water head entering the reversible water-turbine generator set continuously decreases; when the reversible water turbine generator set needs to improve output or stabilize output, compressed air is injected into the air chamber through the air inlet unit, the air pressure of the air chamber is maintained or improved, and the adjustment of a water head is realized;
repeating the steps (2), (3) and (4) to realize the cyclic storage and release of the electric energy and the heat;
(5) And (3) an exhaust process:
when the piston sealing device is positioned at the lowest water level of the gas-liquid containing tank, the exhaust valve is opened periodically to exhaust air accumulated in the water chamber.
The invention has the beneficial effects that:
1. the energy storage system has the energy storage efficiency of more than 70 percent;
2. the gas storage pressure and the water storage pressure can be stabilized in the processes of energy storage and energy release;
3. the power output of the unit in the energy release process can be ensured to be stable and adjustable, and services such as peak regulation, frequency regulation and the like can be provided for a power grid;
4. the energy storage system does not consume fossil fuel, does not produce environmental pollution and is not limited by geographical conditions;
5. the excess heat generated by the system operation can realize comprehensive energy supply, and meanwhile, industrial waste heat can be recycled and reused.
Drawings
Fig. 1 is a schematic structural view of a water-pumping compressed air energy storage system with an adjustable water head according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a water-pumping compressed air energy storage system with an adjustable water head in embodiment 2 of the invention.
Reference numerals are as follows: the system comprises a lower reservoir 1, a reversible water turbine generator set 2, a gas-liquid common tank 3, a piston sealing device 4, an air cooler 5, an air storage tank 6, an air heater 7, an air inlet filtering device 8, an air compressor 9, a pressure stabilizing tank 10, a cold water storage tank 11, a hot water storage tank 12, a first circulating water pump 13, a second circulating water pump 14, a first isolating valve 15, a second isolating valve 16, a third isolating valve 17, a first check valve 18, a fourth isolating valve 19, a pneumatic regulating valve 20, a fifth isolating valve 21, a sixth isolating valve 22, a second check valve 23, a seventh isolating valve 24, a third check valve 25 and an exhaust valve 26.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited to the following examples, so that the objects, solutions and advantages of the present invention can be more clearly understood by those skilled in the art.
In the description of the present invention, it should be noted that unless otherwise explicitly specified or limited, the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated.
It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 1, this embodiment 1 provides a pumped compressed air energy storage system with an adjustable water head, which includes a pumped compressed air energy storage power generation system, an adjustable pressure compressed air system, and a heat storage system.
As shown in fig. 1, the pumped storage power generation system includes a lower reservoir 1, a reversible water-turbine generator set 2, and a gas-liquid common tank 3. The gas-liquid co-containing tank 3 is internally divided into a water chamber and a gas chamber with variable volumes by a piston sealing device 4 capable of moving up and down, and an exhaust valve 26 is arranged at the lowest water level of the gas-liquid co-containing tank 3. The bottom of the lower reservoir 1 is sequentially connected with the water chambers of the reversible water-turbine generator set 2 and the gas-liquid common tank 3 through pipelines, and first isolation valves 15 are arranged in front of and behind the reversible water-turbine generator set 2. During energy storage, the reversible water turbine generator set 2 pressurizes and conveys water in the lower reservoir 1 to a water chamber of the gas-liquid co-containing tank 3; when energy is released and power is generated, high-pressure water in the water chamber enters the reversible water turbine generator set 2 to generate power and is discharged into the lower reservoir 1.
As shown in fig. 1, the pressure-adjustable compressed air system includes the gas-liquid common tank 3, an air storage tank 6 and an air intake unit, and the maximum pressure bearing value of the gas-liquid common tank 3 and the air storage tank 6 should be greater than or equal to 4MPa. The air chamber of the gas-liquid co-containing tank 3 is communicated with the air storage tank 6 through a communicating pipe at the top, and a second isolating valve 16 is arranged at the outlet of the communicating pipe at the air chamber. The air inlet unit comprises an air inlet filtering device 8, an air compressor 9, a pressure stabilizing tank 10, a first check valve 18, a fourth isolating valve 19, a pneumatic regulating valve 20 and a fourth isolating valve 19 which are sequentially communicated through pipelines, and the fourth isolating valve 19 on the rear side of the pneumatic regulating valve 20 is communicated with a communicating pipe on the rear side of the second isolating valve 16. The air storage tank 6 is used for storing compressed air, and when the pumped storage power generation system releases energy for power generation, the compressed air is discharged from the air storage tank 6 to the air chamber of the gas-liquid common tank 3. When the reversible water-turbine generator set 2 needs to adjust output, the pressure stabilizing tank 10 and the air compressor 9 are used for inflating the air chamber of the gas-liquid co-containing tank 3 to adjust the air pressure in the air chamber, so that the function of adjusting the water head of the reversible water-turbine generator set is realized. The piston sealing device 4 plays a role in isolating compressed air and high-pressure water, and reduces air loss and air moisture content.
As shown in fig. 1, the heat storage system includes a cold water storage tank 11, a sixth isolation valve 22, a first water circulating pump 13, a second check valve 23, a sixth isolation valve 22, an air cooler 5, a sixth isolation valve 22, a hot water storage tank 12, a seventh isolation valve 24, a second water circulating pump 14, a third check valve 25, a seventh isolation valve 24, an air heater 7, and a seventh isolation valve 24, which are sequentially connected to form a circulation loop through pipes. The middle section of the communicating pipe is divided into two branch pipes, the air cooler 5 and the air heater 7 are respectively connected to the two branch pipes, the third isolation valve 17 is arranged at the two ends of the air cooler 5, and the fifth isolation valve 21 is arranged at the two ends of the air heater 7. It should be noted that the air cooler 5 and the air heater 7 each have an inner pipe and an outer pipe, and generally, circulating water of the heat storage system circulates through one pipe, and compressed air of the pressure-adjustable compressed air system circulates through the other pipe. When the water pumping compressed air energy storage system stores energy, air in the air chamber is pressed into the air storage tank 6, heat in the air compression process is exchanged to circulating water through the air cooler 5, and the circulating water is stored in the hot water storage tank 12. When the pumped compressed air energy storage system releases energy, compressed air in the air storage tank 6 enters the air chamber, and heat in the hot water storage tank 12 is transferred to the compressed air through the air heater 7.
The embodiment 1 further provides an operation method of a water pumping compressed air energy storage system with an adjustable water head, and the operation method based on the water pumping compressed air energy storage system with the adjustable water head comprises the following steps:
(1) Preparation work:
before the system operates, firstly, the first isolating valve 15 is opened, water in the lower water reservoir 1 is injected into a water chamber of the gas-liquid common tank 3 through the reversible water turbine generator set 2, after the water chamber reaches the lowest water level, water injection is stopped, then, the air compressor 9, the fourth isolating valve 19, the pneumatic regulating valve 20, the second isolating valve 16 and the third isolating valve 17 are opened to inject compressed air into the air chambers of the air storage tank 6 and the gas-liquid common tank 3, and the air pressures in the air storage tank 6 and the air chambers reach a set value of 2MPa. Meanwhile, the first water circulation pump 13 is started to deliver the cold water in the cold water storage tank 11 to the hot water storage tank 12, and the heat of the compressed air is absorbed through the air cooler 5.
(2) Energy storage process:
when the system stores energy, water in the lower water reservoir 1 is continuously injected into the water chamber of the gas-liquid common tank 3 through the reversible water turbine generator set 2, and when the piston sealing device 4 reaches the highest water level, water injection is stopped. When the piston sealing device 4 moves up in the gas-liquid co-containing tank 3, compressed air in the continuous air chamber is injected into the air storage tank 6 through the communicating pipe at the top, the air pressure of the final air storage tank 6 reaches about 4MPa, and the final air storage pressure can be finely adjusted by the air compressor 9 and the pressure stabilizing tank 10 to reach a designed air storage pressure value. When the compressed air in the air chamber flows to the air storage tank 6, the sixth isolation valve 22 and the second check valve 23 are opened, the cold water in the cold water storage tank 11 is delivered to the hot water storage tank 12 through the first circulating water pump 13, and the heat of the compressed air is absorbed through the air cooler 5.
(3) The energy release process is as follows:
when the system releases energy, firstly, the isolating valve 17 is closed, the isolating valve 21 is opened, then the reversible water-turbine generator set 2 is started, compressed air in the air storage tank 6 continuously enters an air chamber of the gas-liquid common tank 3, and high-pressure water of about 4MPa stored in the water chamber pushes the reversible water-turbine generator set 2 to generate power and then is discharged into the lower reservoir 1. In the process that the compressed air in the air storage tank 6 enters the air chamber, the seventh isolating valve 24 and the third check valve 25 are opened, hot water in the hot water storage tank 12 is conveyed to the cold water storage tank 11 through the second circulating water pump 14, and heat is transferred to the compressed air through the air heater 7. And finally, when the piston sealing device 4 reaches the lowest water level, the energy release process is finished, and the air pressure in the gas-liquid co-containing tank 3 and the air storage tank 6 is about 2MPa.
(4) And (3) regulating a water head process:
when the system releases energy, high-pressure water of about 4MPa stored in the gas-liquid co-containing tank 3 pushes the reversible water turbine generator set 2 to generate electricity, and then the electricity is discharged into the lower reservoir 1. Meanwhile, the compressed air in the air storage tank 6 continuously enters the air chamber of the gas-liquid co-containing tank 3, and along with the downward movement of the piston sealing device 4, the air pressure in the air chamber continuously decreases, so that the water head entering the reversible water-turbine generator set 2 also continuously decreases. When the reversible water turbine generator set 2 needs to increase output or stabilize output, compressed air can be injected into the air chamber of the gas-liquid common tank 3 through the pressure stabilizing tank 10 and the pneumatic adjusting valve 20 or further opening the air compressor 9, so that the air pressure of the air chamber is maintained or increased, and the purpose of adjusting the water head is achieved.
And (5) repeating the steps (2), (3) and (4) to realize the storage and release of electric energy and heat circularly.
(5) And (3) an exhaust process:
after the system runs for a long time, the water chamber in the gas-liquid common tank may accumulate air, which may cause cavitation erosion of the reversible water-turbine generator set 2 and reduce the water storage capacity of the gas-liquid common tank 3. In order to discharge this air in time, an exhaust valve 26 is provided at the lowest water level of the accumulator 3, and when the piston seal 4 is at the lowest water level of the accumulator 3, the exhaust valve 26 is periodically opened to discharge the accumulated air.
Example 2
As shown in fig. 2, the present embodiment 2 is different from embodiment 1 in that: this embodiment 2 is provided with two gas-liquid containing tanks 3 and two gas holders 6, between gas-liquid containing tank 3 and gas-liquid containing tank 3 to and all keep interval arrangement between gas holder 6 and the gas-liquid containing tank 3, and all gas-liquid containing tanks 3 and gas holder 6 all are in same horizontal plane.
The energy storage capacity, the heat storage capacity and the system efficiency of the whole system can be improved by properly increasing the number of the gas-liquid common tank 3 and the gas storage tank 6.
According to the description and the drawings, the water pumping compressed air energy storage system with the adjustable water head and the operation method thereof can be easily manufactured or used by the skilled person, and the positive effects recorded in the invention can be produced.
The above description is only a preferred embodiment of the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a compressed air energy storage system draws water of adjustable flood peak which characterized in that: the system comprises a pumped storage power generation system, an adjustable pressure compressed air system and a heat storage system;
the pumped storage power generation system comprises a lower reservoir (1), a reversible water-turbine generator set (2) and at least one gas-liquid co-containing tank (3), wherein the gas-liquid co-containing tank (3) is internally divided into a water chamber and an air chamber which can change volume by a movable piston sealing device (4), and the bottom of the lower reservoir (1) is sequentially connected with the water chambers of the reversible water-turbine generator set (2) and the gas-liquid co-containing tank (3) through a pipeline and a valve; during energy storage, the reversible water turbine generator set (2) pressurizes and conveys water in the lower water reservoir (1) to the water chamber; when energy is released for power generation, high-pressure water in the water chamber enters the reversible water-turbine generator set (2) for power generation and is discharged into the lower reservoir (1);
the pressure-adjustable compressed air system comprises at least one gas-liquid co-containing tank (3), at least one air storage tank (6) and an air inlet unit; the air chamber of the gas-liquid co-containing tank (3) is connected with the air storage tank (6) through a communicating pipe; when energy is released and power is generated, compressed air is discharged from the air storage tank (6) to the gas-liquid co-containing tank (3); when the reversible water turbine generator set (2) needs to adjust output, the air inlet unit is used for inflating the air chamber to adjust the air pressure in the air chamber;
the heat storage system comprises a cold water storage tank (11), a first circulating water pump (13), an air cooler (5), a hot water storage tank (12), a second circulating water pump (14) and an air heater (7) which are sequentially connected into a circulating loop through a pipeline and a valve, wherein the air cooler (5) and the air heater (7) are respectively connected to two branch pipes of the communicating pipe; when energy is stored, air in the air chamber is pressed into the air storage tank (6), heat in the air compression process is exchanged to circulating water through the air cooler (5), and the circulating water is stored in the hot water storage tank (12); when energy is released and electricity is generated, compressed air in the air storage tank (6) enters the air chamber, and heat in the hot water storage tank (12) is transferred to the compressed air through the air heater (7).
2. The adjustable head pumped compressed air energy storage system of claim 1, wherein: the air inlet unit comprises an air inlet filtering device (8), an air compressor (9) and a pressure stabilizing tank (10) which are connected in sequence, and an outlet of the pressure stabilizing tank (10) is communicated with the communicating pipe through a valve.
3. The adjustable head pumped compressed air energy storage system of claim 2, wherein: the highest pressure bearing value of the at least one gas-liquid co-containing tank (3) and the at least one gas storage tank (6) is greater than or equal to 4MPa.
4. The pumped compressed air energy storage system with an adjustable head as claimed in claim 3, wherein: when the number of the gas-liquid containing tanks (3) and the number of the gas storage tanks (6) are more than or equal to two, the gas-liquid containing tanks (3) and the gas storage tanks (6) and the gas-liquid containing tanks (3) are arranged at intervals, and all the gas-liquid containing tanks (3) and all the gas storage tanks (6) are positioned on the same horizontal plane.
5. The pumped compressed air energy storage system with an adjustable head of claim 4, wherein: an exhaust valve (26) is arranged at the lowest water level of the gas-liquid co-containing tank (3).
6. A method of operating a variable head pumped compressed air energy storage system as claimed in claims 1 to 5, comprising the steps of:
(1) Preparation work:
before the system runs, water in the lower water reservoir (1) is injected into a water chamber of the gas-liquid common-holding tank (3) through the reversible water-turbine generator set (2), and water injection is stopped after the water reaches the lowest water level; then injecting compressed air into air chambers in the air storage tank (6) and the gas-liquid co-containing tank (3) through an air inlet unit to enable the air pressure in the air storage tank (6) and the air chambers to reach a set value; meanwhile, a first circulating water pump (13) is started to convey cold water in a cold water storage tank (11) to a hot water storage tank (12), and heat of compressed air is absorbed through an air cooler (5);
(2) Energy storage process:
when the system stores energy, water in a lower water reservoir (1) is continuously injected into a water chamber through a reversible water-turbine generator set (2), when a piston sealing device (4) moves upwards in a gas-liquid common accommodating tank (3), compressed air in the gas chamber is continuously compressed, compressed air is injected into a gas storage tank (6) through a communicating pipe, when the piston sealing device (4) reaches a highest water level point, water injection is stopped, the gas storage pressure is finely adjusted through an air inlet unit, and finally a designed gas storage pressure value is reached; in the process that compressed air in the air chamber flows to the air storage tank (6), cold water in the cold water storage tank (11) is conveyed to the hot water storage tank (12) through the first circulating water pump (13), and heat of the compressed air is absorbed through the air cooler (5);
(3) The energy release process is as follows:
when the system releases energy, the reversible water-turbine generator set (2) is started, and high-pressure water stored in the water chamber pushes the reversible water-turbine generator set (2) to generate electricity and then is discharged into the lower reservoir (1); meanwhile, compressed air in the air storage tank (6) continuously enters the air chamber, and when the piston sealing device (4) reaches the lowest water level, the energy release process is finished;
(4) And (3) regulating a water head process:
when the system releases energy, high-pressure water stored in the water chamber pushes the reversible water turbine generator set (2) to generate electricity, and then the electricity is discharged into the lower reservoir (1); meanwhile, compressed air in the air storage tank (6) continuously enters the air chamber, the air pressure of the air chamber continuously drops along with the continuous drop of the piston sealing device (4), and a water head entering the reversible water-turbine generator set (2) continuously drops; when the reversible water turbine generator set (2) needs to improve output or stabilize output, compressed air is injected into the air chamber through the air inlet unit, so that the air pressure of the air chamber is maintained or improved, and the adjustment of a water head is realized;
and (5) repeating the steps (2), (3) and (4) to realize the cyclic storage and release of the electric energy and the heat.
7. The method of operation of claim 6, further comprising the steps of:
(5) And (3) an exhaust process:
when the piston sealing device (4) is at the lowest water level of the gas-liquid containing tank (3), the exhaust valve (26) is opened periodically to discharge the air accumulated in the water chamber.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115875244A (en) * | 2023-02-13 | 2023-03-31 | 西安热工研究院有限公司 | Constant-pressure full-capacity energy release type compressed air energy storage system and energy storage method |
| CN117318315A (en) * | 2023-09-25 | 2023-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Heat-insulating pumping compressed air energy storage device and method based on multistage water circulation |
| US12025157B1 (en) | 2023-02-13 | 2024-07-02 | Xi'an Thermal Power Research Institute Co., Ltd | Compressed-air energy storage system and method of constant-pressure full-capacity energy-release type |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115875244A (en) * | 2023-02-13 | 2023-03-31 | 西安热工研究院有限公司 | Constant-pressure full-capacity energy release type compressed air energy storage system and energy storage method |
| US12025157B1 (en) | 2023-02-13 | 2024-07-02 | Xi'an Thermal Power Research Institute Co., Ltd | Compressed-air energy storage system and method of constant-pressure full-capacity energy-release type |
| CN117318315A (en) * | 2023-09-25 | 2023-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Heat-insulating pumping compressed air energy storage device and method based on multistage water circulation |
| CN117318315B (en) * | 2023-09-25 | 2024-04-30 | 水利部交通运输部国家能源局南京水利科学研究院 | Heat-insulating pumping compressed air energy storage device and method based on multistage water circulation |
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