CN112128148A - Constant-temperature compressed gas energy storage system and operation method - Google Patents
Constant-temperature compressed gas energy storage system and operation method Download PDFInfo
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- CN112128148A CN112128148A CN202011151490.7A CN202011151490A CN112128148A CN 112128148 A CN112128148 A CN 112128148A CN 202011151490 A CN202011151490 A CN 202011151490A CN 112128148 A CN112128148 A CN 112128148A
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- liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
- F04F1/06—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped
- F04F1/10—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped of multiple type, e.g. with two or more units in parallel
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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
- F01K3/12—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having two or more accumulators
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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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- 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
Abstract
A constant-temperature compressed gas energy storage system and an operation method thereof comprise a liquid pool, wherein the output end of the liquid pool is connected with an inlet of a high-pressure liquid pump, the outlet of the high-pressure liquid pump is connected with one end of a liquid injection main pipe, the other end of the liquid injection main pipe is connected with a liquid inlet at the lower end of a compression tank through a liquid injection valve of the compression tank, a liquid outlet at the lower end of the compression tank is connected with the liquid pool through a liquid return main pipe, and a liquid return valve of the compression tank is arranged; the compression tank top is through being provided with discharge valve, and discharge valve passes through the female union coupling of high pressure air inlet a plurality of gas holders, is provided with the gas holder admission valve on each way gas holder pipeline, and each way gas holder passes through gas holder discharge valve and links to each other with the female pipe of high pressure exhaust, and the female union coupling gas turbine of high pressure exhaust. The invention relates to an energy storage application system which realizes isothermal compression by slowly compressing gas through liquid and finishes energy storage and release through storing and releasing high-pressure gas.
Description
Technical Field
The invention relates to the technical field of energy storage and release by using compressed gas, in particular to a constant-temperature compressed gas energy storage system and an operation method.
Background
Compressed gas energy storage is one of energy storage modes, mature industrial systems are put into use, and air is the most common compressed energy storage medium. The general compressed gas energy storage system compresses gas by using a compressor, so that the pressure of the gas is increased, the volume of the gas is reduced, and the high-pressure energy storage system is usually required to be compressed in multiple stages. Because the temperature rise can be generated by compressing the gas, the compression power consumption and the heat loss are increased, the gas is generally cooled by a heat exchange medium after each stage of compression, the taken heat is stored, and the heat is exchanged again to the working medium gas in the energy release process of the high-pressure gas so as to improve the system efficiency, so that the system is complex and the overall energy storage efficiency is low.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a constant-temperature compressed gas energy storage system and an operation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a constant-temperature compressed gas energy storage system comprises a liquid pool 3, wherein the output end of the liquid pool 3 is connected with the inlet of a high-pressure liquid pump 4, the outlet of the high-pressure liquid pump 4 is connected with one end of a liquid injection main pipe 5, the other end of the liquid injection main pipe 5 is connected with the liquid inlet at the lower end of a compression tank 1 through a liquid injection valve 10 of the compression tank, the liquid outlet at the lower end of the compression tank 1 is connected with the liquid pool 3 through a liquid return main pipe 6, and a liquid return valve 11 of the compression tank is arranged on the liquid return;
the top of the compression tank 1 is provided with an exhaust valve 12, the exhaust valve 12 is connected with a plurality of gas storage tanks 2 through a high-pressure gas inlet main pipe 7, a gas storage tank gas inlet valve 13 is arranged on each path of gas storage tank 2 pipeline, each path of gas storage tank 2 is connected with a high-pressure gas exhaust main pipe 8 through a gas storage tank exhaust valve 14, and the high-pressure gas exhaust main pipe 8 is connected with a gas turbine 9.
The compression tank 1 is a fixed-volume tank body made of steel or other materials and capable of bearing pressure, the outer wall of the compression tank 1 is used for exchanging heat with the environment, the volume of the compression tank 1 is larger than that of a single gas storage tank 2, the compression tank 1 can contain liquid and gas at the same time, and at least one compression tank 1 is arranged.
The gas storage tank 2 is used for containing high-pressure gas, and the gas storage tank 2 is arranged in a plurality.
The high-pressure liquid pump 4 drives the high-pressure liquid by using electric energy or mechanical energy, and converts the high-pressure liquid into pressure potential energy of high-pressure gas.
The high-pressure liquid pumps 4 are in multiple groups, and the liquid injection main pipe 5 is used for communicating all the high-pressure liquid pumps 4 with the liquid injection valve 10 of the compression tank.
The gas turbine 9 is used for applying work to the high-pressure gas when the system releases energy to realize the output of mechanical work or electric work.
An operation method of a constant-temperature compressed gas energy storage system comprises the following steps;
during energy storage, the high-pressure liquid pump 4 compresses liquid in the liquid pool 3 and injects the liquid into the liquid injection main pipe 5, the compression tank 1 in a liquid injection state opens the compression tank liquid injection valve 10 and the compression tank exhaust valve 12, and closes the compression tank liquid return valve 11; the gas storage tank 2 in a to-be-inflated state opens a gas inlet valve 13 of the gas storage tank, closes a gas outlet valve 14 of the gas storage tank, the liquid level slowly rises along with the entrance of high-pressure liquid into the compression tank, the gas is compressed into a high-pressure gas inlet main pipe 7 and then enters the gas storage tank 2, the micro temperature rise generated in the slow compression process is well spread into the environment through the compression tank 1, the gas is approximately constant in temperature, when the liquid level reaches the top of the compression tank 1, the single compression process is finished, at the moment, a liquid injection valve 10 and a gas outlet valve 12 of the compression tank are closed, the gas inlet valve 13 of the gas storage tank is closed, the energy storage process is finished, a liquid return valve 11 of the compression tank is opened, the liquid in the compression tank 1 flows back to the liquid;
during energy release, a plurality of gas storage tanks 2 filled with high-pressure gas are selected according to the energy requirement, exhaust valves 14 of the gas storage tanks are opened, and the high-pressure gas enters a high-pressure exhaust main pipe 8 and then enters a gas turbine 9 to do work, so that the energy release process is completed.
The invention has the beneficial effects that:
utilize high-pressure liquid to slowly compress gas in a big space and realize the constant temperature compression process, directly obtain high-pressure gas under the ambient temperature through one-level compression and store and release, do not need heat transfer and heat accumulation equipment, greatly simplified compressed gas energy storage system, simultaneously because the compression process heat loss that is close to constant temperature is minimum, can make compressed gas energy storage system have very high system overall efficiency.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the system schematic diagram, 1 is a compression tank, 2 is a gas storage tank, 3 is a liquid pool, 4 is a high-pressure liquid pump, 5 is a liquid injection main pipe, 6 is a liquid return main pipe, 7 is a high-pressure gas inlet main pipe, 8 is a high-pressure gas exhaust main pipe, 9 is a gas turbine, 10 is a compression tank liquid injection valve, 11 is a compression tank liquid return valve, 12 is a compression tank exhaust valve, 13 is a gas storage tank inlet valve, and 14 is a gas storage tank exhaust valve
Detailed Description
The present invention will be described in further detail with reference to examples.
Referring to fig. 1, a liquid pool 3 of the constant-temperature compressed gas energy storage system is connected with an inlet of a high-pressure liquid pump 4, and an outlet of the high-pressure liquid pump 4 is connected with a liquid injection main pipe 5. The system is provided with a plurality of compression tanks 1, the compression tank liquid injection valves 10 of all the compression tanks 1 are connected with a liquid injection main pipe 5, and all the compression tank liquid return valves 11 are connected with a liquid return main pipe 6. The exhaust valves 12 of all the compression tanks 1 are connected to the high-pressure intake manifold 7. The system is provided with a plurality of air storage tanks 2, air storage tank inlet valves 13 of all the air storage tanks 2 are connected with a high-pressure air inlet main pipe 7, and exhaust valves 14 of all the air storage tanks are connected with a high-pressure exhaust main pipe 8. The high-pressure exhaust manifold 8 is connected to a gas turbine 9.
The compression tank 1 of the constant-temperature compressed gas energy storage system has a volume which is much larger than that of a single gas storage tank 2, and the outer wall of the gas storage tank 2 can have a good heat transfer process with the environment so as to realize constant-temperature compression. The plurality of compression tanks 1 work alternately in the process of liquid injection or liquid discharge, and simultaneously, each air storage tank 2 completes the process of air inflation or air discharge by controlling the opening and closing of an air inlet valve 13 and an air outlet valve 14 independently, thereby realizing the continuous and parallel energy storage and release processes of the system.
The compression tank 1 may contain both liquid and gas. Each compression tank 1 has a compression tank charge valve 10, a compression tank return valve 11 and a compression tank vent valve 12. The energy storage system compression tank 1 may be arranged in plurality.
The gas storage tank 2 can contain high-pressure gas, and the gas storage tank 2 of the energy storage system can be arranged in a plurality to increase the energy storage capacity of the system.
The liquid bath 3 is capable of holding water or other liquid and has sufficient volume to fill the compression tank 1.
The high-pressure liquid pump 4 drives the high-pressure liquid by using electric energy or mechanical energy, and converts the high-pressure liquid into pressure potential energy of high-pressure gas.
The liquid injection main pipe 5 connects all the high-pressure liquid pumps 4 with the liquid injection valve 10 of the compression tank.
And the liquid return main pipe 6 is used for communicating all the liquid return valves 11 of the compression tank with the liquid pool 3.
The high-pressure air inlet main pipe 7 is used for communicating all the compression tank exhaust valves 12 with the air storage tank inlet valves 13.
The high-pressure exhaust manifold 8 connects all the gas tank exhaust valves 14 to the gas turbine 9.
When the system releases energy, high-pressure gas does work through the gas turbine 9 to realize the output of mechanical work or electric work.
The constant-temperature compressed gas energy storage system has the following implementation process of constant-temperature compression in the energy storage process: by injecting high-pressure liquid into a compression tank 1 filled with gas, the liquid level of the liquid rises slowly, the gas is squeezed into a gas storage tank 2, and in the process of slow compression, the gas and the liquid exchange heat with the outside through the wall of the container, so that the temperature close to the environment is kept.
The constant-temperature compressed gas energy storage system realizes the continuous energy storage and release working process of the energy storage system by controlling different compression tanks 1 to be in a liquid injection or liquid discharge state and controlling the opening and closing states of air inlet valves and air outlet valves of different air storage tanks 2.
The high-pressure liquid pump can be driven by electric energy or mechanical energy, gas is slowly compressed in a large space through high-pressure liquid, the temperature of the gas is kept close to the ambient temperature, the isothermal compression process is realized, and the high-pressure gas is stored in the gas storage tank to finish the energy storage process; when energy needs to be released, high-pressure gas is released to do work through a turbine to complete the energy release process.
The specific working process of the invention is as follows:
during energy storage, the high-pressure liquid pump 4 compresses liquid in the liquid pool 3 and injects the liquid into the liquid injection main pipe 5, the compression tank 1 in a liquid injection state opens the compression tank liquid injection valve 10 and the compression tank exhaust valve 12, and closes the compression tank liquid return valve 11; the gas storage tank 2 in a to-be-inflated state opens a gas storage tank inlet valve 13 and closes a gas storage tank exhaust valve 14, the liquid level rises slowly as high-pressure liquid enters the compression tank, the gas is compressed to enter a high-pressure gas inlet main pipe 7 and then enters the gas storage tank 2, small temperature rise generated in the slow compression process is well spread to the environment through the compression tank 1, the gas is approximately constant in temperature, when the liquid level reaches the top of the compression tank 1, the single compression process is finished, a compression tank liquid injection valve 10 and a compression tank exhaust valve 12 are closed, the gas storage tank inlet valve 13 is closed, the energy storage process is completed, a compression tank liquid return valve 11 is opened, liquid in the compression tank 1 flows back to a liquid pool 3 through a liquid return main pipe 6, and meanwhile the operation is carried out on other to-.
During energy release, a plurality of gas storage tanks 2 filled with high-pressure gas are selected according to the energy requirement, exhaust valves 14 of the gas storage tanks are opened, and the high-pressure gas enters a high-pressure exhaust main pipe 8 and then enters a gas turbine 9 to do work, so that the energy release process is completed.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like 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 constant-temperature compressed gas energy storage system is characterized by comprising a liquid pool (3), wherein the output end of the liquid pool (3) is connected with the inlet of a high-pressure liquid pump (4), the outlet of the high-pressure liquid pump (4) is connected with one end of a liquid injection main pipe (5), the other end of the liquid injection main pipe (5) is connected with the liquid inlet at the lower end of a compression tank (1) through a liquid injection valve (10) of the compression tank, the liquid outlet at the lower end of the compression tank (1) is connected with the liquid pool (3) through a liquid return main pipe (6), and a liquid return valve (11) of the compression tank is arranged on the liquid return main pipe (6;
the top of the compression tank (1) is provided with an exhaust valve (12), the exhaust valve (12) is connected with a plurality of gas storage tanks (2) through a high-pressure gas inlet main pipe (7), each path of gas storage tank (2) is provided with a gas storage tank gas inlet valve (13) on a pipeline, each path of gas storage tank (2) is connected with a high-pressure gas exhaust main pipe (8) through a gas storage tank exhaust valve (14), and the high-pressure gas exhaust main pipe (8) is connected with a gas turbine (9).
2. The constant-temperature compressed gas energy storage system according to claim 1, wherein the compression tank (1) is a fixed-volume tank body made of steel or other materials and capable of bearing pressure, the outer wall of the compression tank (1) is used for exchanging heat with the environment, the volume of the compression tank (1) is larger than that of a single gas storage tank (2), the compression tank (1) contains liquid and gas at the same time, and at least one compression tank (1) is arranged.
3. A constant temperature compressed gas energy storage system according to claim 1, wherein the gas storage tank (2) is used for containing high pressure gas, and a plurality of gas storage tanks (2) are arranged.
4. A constant temperature compressed gas energy storage system according to claim 1, wherein the high pressure liquid pump (4) drives the high pressure liquid by electric energy or mechanical energy to convert into pressure potential energy of the high pressure gas.
5. The constant-temperature compressed gas energy storage system according to claim 1, wherein the high-pressure liquid pumps (4) are in multiple groups, and the liquid injection main pipe (5) is used for communicating all the high-pressure liquid pumps (4) with the liquid injection valve (10) of the compression tank.
6. A constant temperature compressed gas energy storage system according to claim 1, wherein the gas turbine (9) is used for performing work on the high pressure gas when the system releases energy to realize the output of mechanical work or electric work.
7. The operation method of the constant-temperature compressed gas energy storage system according to claim 1, characterized by comprising the following steps;
during energy storage, a high-pressure liquid pump (4) compresses liquid in a liquid pool (3) and injects the liquid into a liquid injection main pipe (5), a liquid injection valve (10) and an exhaust valve (12) of a compression tank are opened by the compression tank (1) in a liquid injection state, and a liquid return valve (11) of the compression tank is closed; the gas storage tank (2) in a to-be-inflated state opens a gas storage tank inlet valve (13), closes a gas storage tank exhaust valve (14), along with the fact that high-pressure liquid enters a compression tank, the liquid level slowly rises, the gas is compressed and enters a high-pressure gas inlet main pipe (7) and then enters the gas storage tank (2), tiny temperature rise generated in the slow compression process is well scattered to the environment through the compression tank (1), the gas is approximately constant in temperature, when the liquid level reaches the top of the compression tank (1), the single compression process is finished, at the moment, a compression tank liquid injection valve (10) and the compression tank exhaust valve (12) are closed, the gas storage tank inlet valve (13) is closed, the energy storage process is finished, a compression tank liquid return valve (11) is opened, the liquid in the compression tank (1) flows back to a liquid pool (3) through a liquid return main pipe (6;
when energy is released, a plurality of gas storage tanks (2) filled with high-pressure gas are selected according to the energy requirement, exhaust valves (14) of the gas storage tanks are opened, and the high-pressure gas enters a high-pressure exhaust main pipe (8) and then enters a gas turbine (9) to do work, so that the energy releasing process is completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011151490.7A CN112128148A (en) | 2020-10-25 | 2020-10-25 | Constant-temperature compressed gas energy storage system and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011151490.7A CN112128148A (en) | 2020-10-25 | 2020-10-25 | Constant-temperature compressed gas energy storage system and operation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143087A (en) * | 2022-06-27 | 2022-10-04 | 西安热工研究院有限公司 | Open type isothermal compressed air energy storage system and operation method thereof |
| CN115773224A (en) * | 2023-02-13 | 2023-03-10 | 西安热工研究院有限公司 | Isothermal compression constant-voltage power generation physical energy storage device, system and method |
-
2020
- 2020-10-25 CN CN202011151490.7A patent/CN112128148A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143087A (en) * | 2022-06-27 | 2022-10-04 | 西安热工研究院有限公司 | Open type isothermal compressed air energy storage system and operation method thereof |
| CN115773224A (en) * | 2023-02-13 | 2023-03-10 | 西安热工研究院有限公司 | Isothermal compression constant-voltage power generation physical energy storage device, system and method |
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