CN112855265A - Water-soluble cavity-making energy storage combined system and method - Google Patents
Water-soluble cavity-making energy storage combined system and method Download PDFInfo
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- CN112855265A CN112855265A CN202011643923.0A CN202011643923A CN112855265A CN 112855265 A CN112855265 A CN 112855265A CN 202011643923 A CN202011643923 A CN 202011643923A CN 112855265 A CN112855265 A CN 112855265A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 150000003839 salts Chemical class 0.000 claims abstract description 117
- 239000012267 brine Substances 0.000 claims abstract description 67
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
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- Life Sciences & Earth Sciences (AREA)
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a water-soluble cavity-making energy storage combined system and method, which can increase the salt content of brine returned from a water-soluble cavity and is also beneficial to popularization and application of a physical energy storage technology. It comprises a water pump turbine, a water vapor container, a brine pool and an underground salt cavern; a water inlet of the water turbine of the water pump is connected with the clear liquid on the upper part of the brine pool, an outlet of the water turbine of the water pump is connected with the water-gas container, and a valve is arranged between the water turbine of the water pump and the water-gas container; the water outlet of the water-gas container is connected with the underground salt cavern, and a water valve is arranged on the pipeline; the outlet of the gas end of the water gas container is connected with the top of the underground salt cavern; the bottom of the underground salt cavern is communicated with the brine pond through a pipeline; and a connecting pipeline is arranged between the brine pond and the inlet of the water pump turbine. The system changes the fixing mode of arranging the water pump and the water turbine set based on high and low water levels in the traditional pumped storage system, can realize flexible arrangement of the water pump and the water turbine according to the principle of simple and convenient operation, and can simultaneously carry out dual-system utilization of water-soluble cavity construction and energy storage.
Description
Technical Field
The invention belongs to the technical field of physical energy storage, and particularly relates to a water-soluble cavity-making energy storage combined system and method.
Background
In China, salt caverns are abundant in resources, and are used more and more widely as gas storage and oil storage spaces. Large scale, low cost construction of salt cavern gas storage is a critical issue. In the traditional salt cavern cavity manufacturing process, a multi-purpose water-soluble cavity manufacturing process is adopted, light salt water or clean water is injected into a salt layer, original brine in a salt layer cavity is extruded out along with the entry of the clean water or the light salt water, and salt in the salt layer is continuously taken out by water along with the repeated operation of the process, so that the water-soluble cavity manufacturing process of underground salt caverns is completed. In the above method, in order to ensure economy, it is required that the cavity forming speed is high and the cavity forming volume is large.
In order to meet the requirement of higher cavity making speed, clear water or light salt water needs to be injected into the underground salt cavern at a larger flow and a larger water head, the energy consumption of a water pump is higher, and the salt content of the returned brine is lower because the clear water is in shorter time with the salt layer in the underground salt cavern after being injected. In addition, in order to meet the economic requirement, a large space is needed after the cavity building of the underground salt cavern is finished, so that the gas storage or the oil storage is convenient, and the development of the small and medium-sized underground salt caverns is limited.
In the physical energy storage technology, the compressed air energy storage and pumped storage technology is concerned with high reliability, high efficiency and low cost, and the technology has been developed for a long time and is relatively mature, and can basically realize energy storage profit.
Disclosure of Invention
In order to solve the problems that the cost of a middle and small underground salt cavern water-soluble cavity is high and the energy storage space of an energy storage system is limited in the prior art, the invention provides a water-soluble cavity-making energy storage combined system and a water-soluble cavity-making energy storage combined method, which are beneficial to popularization and application of a physical energy storage technology.
The invention is realized by the following technical scheme:
the water-soluble cavity-making energy storage combined system comprises a water pump turbine, a water-gas container, a brine pond and an underground salt cavern;
a water inlet of the water turbine of the water pump is connected with the clear liquid on the upper part of the brine pool, an outlet of the water turbine of the water pump is connected with the water-gas container, and a valve is arranged between the water turbine of the water pump and the water-gas container;
the water outlet of the water-gas container is connected with the underground salt cavern, and a water valve is arranged on the pipeline; the outlet of the gas end of the water gas container is connected with the top of the underground salt cavern; the bottom of the underground salt cavern is communicated with the brine pond through a pipeline; and a connecting pipeline is arranged between the brine pond and the inlet of the water pump turbine.
Preferably, the underground salt cavern is a salt well with a single-well structure or a double-well structure.
Preferably, the pump turbine is a pump-turbine all-in-one machine or a combination of a pump and a turbine.
Preferably, the outlet of the gas end of the water gas container is connected with a gas end pipeline at the top of the underground salt cavern and a pipeline at the bottom of the underground salt cavern and communicated with the brine pond are respectively provided with a corresponding valve.
Preferably, the water inlet of the pump turbine is also connected with incoming clear water.
The water-soluble cavity-making energy storage combination method is based on any one of the water-soluble cavity-making energy storage combination systems, and comprises,
storing energy or making a cavity, pressing the light brine of the clear liquid on the upper part of the brine pool into a water-gas container by a water pump turbine unit, meanwhile, introducing gas in the water-gas container into an underground salt cavern through a gas end pipeline, and discharging the brine in the underground salt cavern into the brine pool under the extrusion of the gas;
the energy is released, the light brine in the water-gas container enters the brine pool after entering the water pump turbine unit through the valve, and meanwhile, the gas in the underground salt cavern enters the water-gas container under the action of the pressure difference between the brine pool and the liquid column of the underground salt cavern;
and (3) preparing a cavity, after brine in the underground salt cavern is discharged, closing a water pump and a water turbine and a pipeline valve at the underground salt cavern, opening a water end valve, and allowing the light brine in the water-gas container to enter the underground salt cavern through the water end pipeline under the action of height drop, wherein gas in the underground salt cavern enters the water-gas container through the gas end pipeline.
Preferably, the scale of the stored energy is selected by adjusting the water-to-air ratio in the water-to-air vessel.
Preferably, before energy storage or cavity creation, gas is preset in the underground salt cavern and the water-gas container, and the gas pressure in the underground salt cavern and the water-gas container is equal to the water level pressure difference between the brine pond and the underground salt cavern.
Preferably, the liquid level in the underground salt cavern is always higher than the pipeline port connected with the brine pond in the underground salt cavern; the liquid level in the water vapor container is always higher than the water end outlet and the pipeline port where the water pump turbine is located.
Preferably, both ends of the gas end pipeline are respectively and always communicated with the gas part of the underground salt cavern and the gas part of the water-gas container.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the water-soluble cavity-making energy storage combined system, the water pump water turbine, the water vapor container, the brine pool, the underground salt cavern, each pipeline and each valve are arranged, the water inlet of the water pump water turbine is connected with the brine pool, the outlet of the water pump water turbine is connected with the water vapor container, and the valve is arranged between the water vapor container and the water pump water turbine; the water outlet of the water-gas container is connected with the underground salt cavern, and a valve is arranged on the pipeline; the outlet of the gas end of the water gas container is connected with the top of the underground salt cavern; the bottom of the underground salt cavern is communicated with the brine pond through a pipeline; and a connecting pipeline is arranged between the brine pond and the inlet of the water pump turbine. The system changes the fixing mode of arranging the water pump and the water turbine set based on high and low water levels in the traditional pumped storage system, can realize flexible arrangement of the water pump and the water turbine according to the principle of simple and convenient operation, and can simultaneously carry out dual-system utilization of water-soluble cavity construction and energy storage.
Furthermore, the system is suitable for a single-well structure or a double-well structure, and is wider in application range.
Furthermore, the pump turbine of the system can be a pump turbine or a combination of a pump and a turbine, can be arranged and assembled according to actual sites, and is more flexible.
Furthermore, the gas end pipeline of the system, which is connected with the top of the underground salt cavern through the gas end outlet, and the pipeline, which is communicated with the brine pond, at the bottom of the underground salt cavern are respectively provided with corresponding valves, and whether the valves are arranged or not can be set according to actual conditions, so that the adaptability of the system is greatly improved.
Furthermore, the water quantity in the water-gas container is supplemented on one hand, the dilute brine in the water-gas container can be further diluted on the other hand, and the water pump and the water turbine are washed and protected in the supplementing process through the incoming clear water.
The invention relates to a water-soluble cavity-making energy storage combined method, which comprises the steps that when a water pump pumps water into a water-gas container, gas extrusion is carried out to discharge liquid in an underground salt cavern, clear water flows into the underground salt cavern through the action of height drop, and meanwhile, the gas returns to the water-gas container; in the process of energy storage and release, the constant pressure characteristic in the underground salt cavern is mainly utilized, and a water-gas container and a pipeline are combined, so that the circulation of gas and liquid in the system is achieved, equipment and facilities used in the water-soluble cavity making are fully utilized, the investment is basically avoided, the pressure in the underground salt cavern is stable in the water-soluble cavity making process, the cavity is prevented from collapsing, and the salt mining cost of the medium and small underground salt caverns is reduced by utilizing the benefit of an energy storage system.
Furthermore, gas is preset in the underground salt cavern and the water vapor container, and the gas pressure in the underground salt cavern and the water vapor container is equal to the water level pressure difference between the brine pond and the underground salt cavern, so that the constant pressure state in the system is formed.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage combined system of a water-soluble cavity in the embodiment of the invention.
In the figure: 1 is incoming clear water; 2 is a water pump turbine; 3 is a valve; 4 is a water vapor container; 5 is a water end valve; 6 is underground salt cavern; 7 is a brine pool; and 8 is a gas end pipeline.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The present invention will be described in detail below with reference to the following detailed description and the accompanying drawings.
The invention combines the water-soluble cavity-building technology and the physical energy storage technology, not only can reduce the cost of the energy storage system by utilizing the existing underground salt cavern space and the salt mining equipment, but also can reduce the comprehensive cost in the development of medium and small underground salt caverns by the profit of the energy storage system. In addition, through the design of a combined system, the problems of low salt content, weak profit capacity, high energy consumption and the like of the brine returned in the traditional salt mining process are solved.
As shown in fig. 1, a water-soluble cavity-making energy storage combined system comprises a water pump 2, a water-gas container 4, a brine pool 7, an underground salt cavern 6, and pipelines and valves;
a water inlet of the pump water turbine 2 is connected with incoming clear water 1 or a brine pool 7, an outlet of the pump water turbine 2 is connected with a water-gas container 4, and a valve 3 is arranged between the water-gas container 4 and the pump water turbine 2; the water outlet of the water-gas container 4 is connected with an underground salt cavern 6, and a water valve 5 is arranged on the pipeline; the outlet of the gas end of the water gas container 4 is connected with the top of the underground salt cavern 6; the bottom of the underground salt cavern 6 is communicated with the brine tank 7 through a pipeline; a connecting pipeline is arranged between the brine tank 7 and the inlet of the pump turbine 2.
The underground salt cavern 6 is not limited to a single well structure, but a double well structure can be used.
The pump turbine 2 can be replaced by a pump and a turbine.
The brine pond 7 is not limited to ground equipment, and can also be a pond dug on site.
The outlet of the gas end of the water gas container 4 is connected with a gas end pipeline at the top of the underground salt cavern 6, and a pipeline at the bottom of the underground salt cavern 6 and communicated with the brine pool 7 can be respectively provided with a corresponding valve or not.
According to the water-soluble cavity-building energy storage combined method, energy storage or cavity building can be performed through the same water pressing operation, energy is fully utilized through energy storage and energy release in a time period when brine concentration in an underground salt cavern is low, and meanwhile, brine in the underground salt cavern is stirred through alternation of energy release and cavity building preparation, so that formation of the brine is accelerated; after the concentration is reached, rapidly making a cavity; through the circulation of energy storage, energy release, cavity construction and cavity construction preparation, the high-efficiency combination of water-soluble cavity construction energy storage can be efficiently carried out, and the combination of multiple working states can be flexibly carried out according to the time and energy requirements; the method comprises the following specific steps:
the gas pressure in the underground salt cavern 6 and the water gas container 4 is equal to the water level pressure difference between the brine pool 7 and the underground salt cavern 6.
Water-soluble cavity making process: clean water or light salt water enters the water pump turbine 2 and then is pressed into the water vapor container 4, along with the rise of the liquid level in the water vapor container 4, gas in the water vapor container 4 enters the underground salt cavern 6 through the gas end pipeline 8, along with the gas entering the underground salt cavern 6, brine in the underground salt cavern 6 is discharged into the brine pool 7. After brine is discharged, the water pump turbine 2 and the pipeline valve 3 are closed, the water end valve 5 is opened, under the action of height fall, clear water or light salt water in the water-gas container 4 enters the underground salt cavern 6 through the water end pipeline, and meanwhile, gas in the underground salt cavern 6 enters the water-gas container 4 through the gas end pipeline 8. The pressure in the underground salt cavern 6 and the water gas container 4 is substantially constant throughout the process.
After the cavity is manufactured, the working process of the energy storage system is as follows: in the energy storage process, the water pump turbine unit 2 presses water into the water-gas container 4 from the brine tank 7, meanwhile, gas in the water-gas container 4 enters the underground salt cavern 6 through the gas end pipeline 8, water in the underground salt cavern 6 enters the brine tank 7 under the extrusion of the gas, and the pressure in the underground salt cavern 6 and the water-gas container 4 is basically constant in the whole process. In the energy releasing process, water in the water-gas container 4 enters the water pump turbine unit 2 through the valve 3 and then enters the brine tank 7, meanwhile, gas in the underground salt cavern 6 enters the water-gas container 4 under the action of pressure difference between the brine tank 7 and a liquid column of the underground salt cavern 6, and the pressure in the underground salt cavern 6 and the water-gas container 4 is basically constant in the whole process.
Because the brine is consumed in the cavity making process, the water inlet of the pump turbine 2 on the water vapor container 4 is also connected with incoming clear water 1 for supplementing circulating liquid and diluting the light brine in the water vapor container 4.
Further, in the working process of the energy storage system, the water-gas ratio in the underground salt cavern 6 and the water-gas ratio in the water-gas container 4 are selected according to the volume of the water-gas container 4, the volume of the underground salt cavern 6 and the energy storage scale.
Further, system operational combinations include, but are not limited to: energy storage-energy release; making a cavity-making preparation; energy storage, cavity preparation, cavity construction and energy release; cavitating-energy releasing; preparing a cavity, storing energy, releasing energy and constructing the cavity; and a complex working mode formed by connecting any combination of the above modes.
The water-soluble cavity making process is combined with the energy storage system, comprehensive analysis is carried out, the pressure in the underground salt cavern is stable in the water-soluble cavity making process, the cavity is prevented from collapsing, and the salt mining cost of the medium and small underground salt caverns is reduced by utilizing the benefit of the energy storage system. In addition, for the construction of an energy storage system, the equipment and facilities used in the water-soluble construction cavity are fully utilized, the investment is basically avoided, the energy can be fully utilized and released on the spot, the supply requirement of the energy is met, the expenditure of the two systems is greatly reduced, and unexpected technical effects are realized.
Claims (10)
1. The water-soluble cavity-making energy storage combined system is characterized by comprising a water pump turbine (2), a water-vapor container (4), a brine pool (7) and an underground salt cavern (6);
a water inlet of the pump water turbine (2) is connected with clear liquid on the upper part of the brine pool (7), an outlet of the pump water turbine (2) is connected with the water-gas container (4), and a valve (3) is arranged between the pump water turbine (2) and the water-gas container (4);
the water outlet of the water-gas container (4) is connected with an underground salt cavern (6), and a water valve (5) is arranged on the pipeline; the outlet of the gas end of the water gas container (4) is connected with the top of the underground salt cavern (6); the bottom of the underground salt cavern (6) is communicated with the brine pool (7) through a pipeline; a connecting pipeline is arranged between the brine pool (7) and the inlet of the water pump turbine (2).
2. A water-soluble cavitation energy storage combination according to claim 1, characterized in that the underground salt cavern (6) is a salt well of single-well or twin-well construction.
3. The water-making cavity energy storage combined system according to claim 1, wherein the pump-turbine (2) is a pump-turbine integrated machine or a combination of a pump and a turbine.
4. The water-soluble cavity-making energy storage combined system according to claim 1, wherein a gas end pipeline (8) at the top of the underground salt cavern (6) is connected with a gas end outlet of the water-gas container (4), and a pipeline at the bottom of the underground salt cavern (6) and communicated with the brine pool (7) is respectively provided with a corresponding valve.
5. The water cavity-building energy storage combined system according to claim 1, wherein the inlet of the pump turbine (2) is further connected with incoming clear water (1).
6. Water-soluble cavity-making energy storage combined method based on any one of the water-soluble cavity-making energy storage combined systems in claims 1-5 is characterized by comprising,
storing energy or making a cavity, pressing light brine of clear liquid on the upper part of a brine pool (7) into a water-gas container (4) by a water pump turbine unit (2), meanwhile, introducing gas in the water-gas container (4) into an underground salt cavern (6) through a gas end pipeline (8), and discharging brine in the underground salt cavern (6) into the brine pool (7) under the extrusion of the gas;
energy is released, the light brine in the water-gas container (4) enters the brine pool (7) after entering the water pump turbine unit (2) through the valve (3), and meanwhile, the gas in the underground salt cavern (6) enters the water-gas container (4) under the action of the pressure difference between the brine pool (7) and the liquid column of the underground salt cavern (6);
and (3) preparing a cavity, after brine in the underground salt cavern (6) is discharged, closing the water pump, the water turbine (2) and the pipeline valve (3) at the water pump, opening the water end valve (5), and allowing the light brine in the water-gas container (4) to enter the underground salt cavern (6) through the water end pipeline under the action of height drop, wherein gas in the underground salt cavern (6) enters the water-gas container (4) through the gas end pipeline (8).
7. An integrated aqueous cavitary energy storage method according to claim 6, wherein the scale of energy storage is selected by adjusting the water/air ratio in the water/air container (4).
8. The water-soluble cavity-making energy storage combination method as claimed in claim 6, wherein before energy storage or cavity making, gas is preset in the underground salt cavern (6) and the water-gas container (4), and the gas pressure in the underground salt cavern (6) and the water-gas container (4) is equal to the water level pressure difference between the brine pool (7) and the underground salt cavern (6).
9. The water-soluble cavity-making energy storage combination method as claimed in claim 6, characterized in that the liquid level in the underground salt cavern (6) is always higher than the pipeline port connected with the brine pool (7) in the underground salt cavern (6); the liquid level in the water vapor container (4) is always higher than the water end outlet and the pipeline port where the water pump turbine (2) is located.
10. The water-soluble cavity-making energy storage combination method as claimed in claim 6, wherein two ends of the gas end pipeline (8) are respectively communicated with the gas part of the underground salt cavern (6) and the gas part of the water-gas container (4) all the time.
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| CN113931693A (en) * | 2021-10-08 | 2022-01-14 | 中国科学院电工研究所 | Comprehensive physical energy storage system |
| CN114017116A (en) * | 2021-09-28 | 2022-02-08 | 宁波大学 | Atmospheric pressure type compressed air energy storage and salt and heat extraction coupling system |
| CN114542946A (en) * | 2022-02-21 | 2022-05-27 | 江苏国能石油天然气有限公司 | Method for generating power by using underground space compressed water for energy storage |
| CN115142831A (en) * | 2022-06-23 | 2022-10-04 | 江苏国能石油天然气有限公司 | Method for driving MVR (mechanical vapor recompression) salt production by utilizing brine excess pressure of salt cavern gas storage |
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| CN112855265B (en) | 2021-12-28 |
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