CN111075695B - Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system - Google Patents
Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system Download PDFInfo
- Publication number
- CN111075695B CN111075695B CN201911360560.7A CN201911360560A CN111075695B CN 111075695 B CN111075695 B CN 111075695B CN 201911360560 A CN201911360560 A CN 201911360560A CN 111075695 B CN111075695 B CN 111075695B
- Authority
- CN
- China
- Prior art keywords
- pressure
- air
- storage tank
- ejector
- medium
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
-
- 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
-
- 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
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/18—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for compressing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/031—Air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0157—Compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0171—Arrangement
- F17C2227/0185—Arrangement comprising several pumps or compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/04—Methods for emptying or filling
- F17C2227/041—Methods for emptying or filling vessel by vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/01—Intermediate tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0626—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/07—Actions triggered by measured parameters
- F17C2250/072—Action when predefined value is reached
-
- 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
The invention discloses a compressed air energy storage system with an ejector for strengthening air storage and an air storage process thereof. When the maximum working pressure of the air storage tank is lower than the outlet pressure of the ejector, the compressor and the ejector are matched for use to charge air; when the maximum working pressure of the air storage tank is larger than the outlet pressure of the ejector, the compressor and the ejector are matched for inflation, then the relevant valve is adjusted, the ejector stops working, and the compressor continues to inflate to work. The throttle valve is matched with the ejector, so that the throttling loss of the throttle valve is reduced. The air storage process and the optimization strategy are compact in structure, simple, flexible and easy to operate, the air storage process can be safely and stably realized, and reference is provided for further development of a compressed air energy storage system.
Description
Technical Field
The invention belongs to the technical field of compressed air energy storage, and relates to a compressed air energy storage system for enhancing air storage of an ejector and an air storage process thereof.
Background
In order to optimize the energy structure and protect the environment, clean energy such as wind energy, solar energy, tidal energy and the like needs to be vigorously developed. However, renewable energy sources represented by wind energy and solar energy have inherent problems such as dispersibility and intermittency at present, large-scale continuous and stable grid-connected continuous power generation is difficult to realize, and energy storage can effectively solve the problems. At present, the energy storage capacity can exceed 100MW, and the large-scale energy storage technology for realizing commercial operation only comprises pumped storage and compressed air energy storage. However, the pumped storage power station needs special geographical conditions to build an upper reservoir and a lower reservoir and dams, the site selection is difficult, the construction period is long, the initial investment is huge, the ecological environment is damaged, and domestic and foreign available resources are increasingly rare. The compressed air energy storage system (CAES) has the advantages of large energy storage capacity, long energy storage period, relatively high efficiency (50-70%), relatively small unit investment and the like. However, the traditional compressed air energy storage system is matched with a gas turbine power station for use, fossil energy is consumed, and carbon emission is increased. And the problem that the operation efficiency of the air compressor and the gas turbine adopting the large-scale turbine machinery is not high exists.
For a compressed air energy storage system with a constant volume of an air storage tank, in the air storage process, when a throttle valve is not arranged between an outlet of a compressor unit/an inlet of an expansion unit and a high-pressure air storage tank, the outlet pressure of a high-pressure section compressor is increased along with the increase of the air pressure in the high-pressure air storage tank, in the energy release process, the inlet air pressure of a turbine expansion machine is reduced along with the reduction of the pressure of the high-pressure air storage tank, and the compressed air energy storage system cannot work efficiently under. Generally, the operating states of the high pressure compressor and the high pressure expander are stabilized by installing a throttle valve at an inlet and an outlet of the high pressure receiver, but a large pressure difference causes an inevitable throttling loss at the throttle valve.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a compressed air energy storage system and an air storage process strategy based on the compressed air energy storage system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a compressed air energy storage system with an ejector for strengthening air storage, which comprises a two-stage heat storage medium storage tank for providing a heat exchange medium, and a low-pressure section air storage unit, a medium-pressure section air storage unit and a high-pressure section air storage unit which are connected through an air transmission pipeline;
the low-pressure section gas storage unit comprises a low-pressure section compressor, a heat exchanger A and a low-pressure gas storage tank, a three-way valve A is arranged on a gas transmission pipeline connecting the heat exchanger A and the low-pressure gas storage tank, and an ejector A is also arranged between the three-way valve A and the low-pressure gas storage tank; the medium-pressure section gas storage unit comprises a medium-pressure section compressor, a heat exchanger B and a medium-pressure gas storage tank, a three-way valve C is arranged on a gas transmission pipeline connected with the heat exchanger B and the medium-pressure gas storage tank, and an ejector B is also arranged between the three-way valve C and the medium-pressure gas storage tank; the high-pressure section gas storage unit comprises a high-pressure section compressor, a heat exchanger C and a high-pressure gas storage tank, a three-way valve E is arranged on a gas transmission pipeline connecting the heat exchanger C and the high-pressure gas storage tank, and an ejector C is also arranged between the three-way valve E and the high-pressure gas storage tank;
a flow regulating valve B is arranged on a pipeline connecting the low-pressure gas storage tank and the middle-pressure section compressor, and a flow regulating valve D is arranged on a pipeline connecting the middle-pressure gas storage tank and the high-pressure section compressor; the low-pressure gas storage tank, the ejector B and the medium-pressure gas storage tank are connected through a three-way valve F, and the medium-pressure gas storage tank, the ejector C and the high-pressure gas storage tank are connected through a three-way valve G;
the two-stage heat storage medium storage tank comprises a low-temperature heat storage medium storage tank and a high-temperature heat storage medium storage tank, and the low-temperature heat storage medium storage tank and the high-temperature heat storage medium storage tank are connected with the heat exchanger A, the heat exchanger B or the heat exchanger C through heat exchange medium pipelines to realize the transportation of heat exchange media; the outlet end of the low-temperature heat storage medium storage tank is provided with a switch valve and a booster pump;
the high-pressure air storage tank is also provided with three air inlet branches, a throttle valve H is arranged on a branch of the three-way valve G connected with the high-pressure air storage tank, a throttle valve I is arranged on a branch of the ejector C connected with the high-pressure air storage tank, and a throttle valve J is arranged on a branch of the three-way valve E connected with the high-pressure air storage tank.
Preferably, the number of compressor stages contained in the low-pressure section compressor, the medium-pressure section compressor and the high-pressure section compressor is more than or equal to 1.
Preferably, the low and medium pressure reservoirs are much smaller in volume than the high pressure reservoir.
Preferably, the heat storage and exchange media in the low-temperature heat storage medium storage tank and the high-temperature heat storage medium storage tank are the same liquid medium.
Preferably, the heat exchanger A, the heat exchanger B and the heat exchanger adopt dividing wall type heat exchange and are selected from a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger or a plate type heat exchanger.
The invention also discloses a gas storage process of the compressed air energy storage system for enhancing gas storage by adopting the ejector, which comprises the following steps: running a preparation process and a normal working gas storage process;
the operation preparation process is that the pressure in the high-pressure air storage tank is increased from the atmospheric pressure to the minimum working pressure;
the normal working gas storage process refers to the process that the pressure in the high-pressure gas storage tank is increased from the minimum working pressure of the energy storage system until the pressure is increased to the maximum working pressure of the energy storage system.
Preferably, the operation preparation process comprises two inflation methods, specifically as follows:
the method comprises the following steps:
the low-pressure section compressor, the medium-pressure section compressor and the high-pressure section compressor are driven to work simultaneously, a part of air enters the low-pressure section compressor to be heated and pressurized, is cooled by the heat exchanger A and then enters the ejector A as active flow, the other part of air enters the ejector A as injection flow, and air at the outlet of the ejector A is injected into the low-pressure air storage tank;
the low-pressure air storage tank is provided with two paths of air outlets, wherein one path of air enters the medium-pressure section compressor to be heated and boosted, then enters the heat exchanger B to be cooled, then enters the ejector B as a driving flow, the other path of air at the outlet of the low-pressure air storage tank enters the ejector B as an injection flow, and the air at the outlet of the ejector B is injected into the medium-pressure air storage tank;
the medium-pressure air storage tank is also provided with two paths of air outlets, one path of outlet air enters the high-pressure section compressor to be heated and pressurized, then is cooled by the heat exchanger C and then enters the ejector C as active flow, the other path of air at the outlet of the medium-pressure air storage tank enters the ejector C as ejection flow, the air at the outlet of the ejector C is injected into the high-pressure air storage tank through the throttle valve I, and the throttle valve I maintains the outlet pressure of the ejector C to be stable; when the air pressure in the high-pressure air storage tank is increased to be equal to the minimum working pressure of the energy storage system, the operation preparation process is completed;
the second method comprises the following steps:
driving a low-pressure section compressor, a medium-pressure section compressor and a high-pressure section compressor to work step by step, enabling a part of air to enter the low-pressure section compressor for temperature and pressure rise, enabling the part of air to enter an ejector A as active flow after being cooled by a heat exchanger A, enabling the other part of air to enter the ejector A as injection flow, and enabling air at an outlet of the ejector A to be injected into a low-pressure air storage tank; the air at the outlet of the low-pressure air storage tank enters a medium-pressure air storage tank through a three-way valve F and then enters a high-pressure air storage tank through a three-way valve G, so that the air at the outlet of the ejector A inflates the high-pressure air storage tank, and a throttle valve H maintains the pressure at the outlet of the ejector A to be stable;
when the air pressure in the high-pressure air storage tank is increased from the atmospheric pressure to the outlet pressure of the ejector A, the high-pressure air storage tank is divided into a flow regulating valve B and a three-way valve F, so that a middle-pressure section compressor and the ejector B work, one path of air in the low-pressure air storage tank 140 enters the middle-pressure section compressor for temperature and pressure rise, is cooled by a heat exchanger B and then enters the ejector B as an active flow, meanwhile, the other path of air in the low-pressure air storage tank enters the ejector B as an injection flow, the outlet air of the ejector B is injected into the middle-pressure air storage tank, and then enters the high-pressure air storage tank through the three-way valve G and a throttle;
when the air pressure in the high-pressure air storage tank rises from the outlet pressure of the ejector A to the outlet pressure of the ejector B, the high-pressure air storage tank is divided into a flow regulating valve D and a three-way valve G, so that the high-pressure section compressor and the ejector C work, one path of air in the medium-pressure air storage tank enters the high-pressure section compressor to be heated and boosted, the air is cooled by the heat exchanger C and then enters the ejector C as a driving flow, meanwhile, the other path of air in the medium-pressure air storage tank enters the ejector C as an injection flow, the outlet air of the ejector C is injected into the high-pressure air storage tank through a throttle valve I, the throttle valve I maintains the outlet pressure of the ejector C to be stable.
Preferably, the normal working gas storage process comprises two situations;
the first situation is as follows:
when the maximum working pressure in the high-pressure air storage tank is smaller than the air pressure at the outlet of the ejector C, the low-pressure section compressor, the medium-pressure section compressor, the high-pressure section compressor, the ejector A, the ejector B and the ejector C work simultaneously, and the air at the outlet of the ejector C is used for inflating the high-pressure air storage tank;
the specific process is as follows: the atmospheric air enters a low-pressure section compressor for temperature and pressure rise, is cooled by a heat exchanger A and enters an ejector A as active flow, the other part of atmospheric air enters the ejector A as ejection flow, and air at the outlet of the ejector A is injected into a low-pressure air storage tank; the low-pressure air storage tank is provided with two paths of air outlets, wherein one path of air enters the medium-pressure section compressor to be heated and boosted, then enters the heat exchanger B to be cooled, then enters the ejector B as a driving flow, the other path of air at the outlet of the low-pressure air storage tank enters the ejector B as an injection flow, and the air at the outlet of the ejector B is injected into the medium-pressure air storage tank; the medium-pressure air storage tank is also provided with two paths of air outlets, one path of outlet air enters the high-pressure section compressor to be heated and pressurized, then is cooled by the heat exchanger C and then enters the ejector C as active flow, the other path of air from the medium-pressure air storage tank 240 enters the ejector C as ejection flow, the outlet air of the ejector C is injected into the high-pressure air storage tank through the throttle valve I, and the throttle valve I maintains the outlet pressure of the ejector C to be stable; when the air pressure in the high-pressure air storage tank is increased to be equal to the maximum working pressure of the energy storage system, ending the air storage process;
case two:
when the maximum working pressure of the air storage system is larger than the air pressure of the outlet of the ejector C, the high-pressure air storage tank is firstly inflated by using the scheme of the first case, when the air pressure in the high-pressure air storage tank is increased to be equal to the air pressure at the outlet of the ejector C, the three-way valve A, the three-way valve C and the three-way valve E are adjusted to stop the ejector A, the ejector B and the ejector C from working, so that the air at the outlet of the heat exchanger A directly enters the low-pressure air storage tank, the air at the outlet of the heat exchanger B directly enters the medium-pressure air storage tank, and the air at the outlet of the heat exchanger C enters the, and simultaneously adjusting the three-way valve F and the three-way valve G to enable air in the low-pressure air storage tank to enter the middle-pressure section compressor and enable air in the middle-pressure air storage tank to enter the high-pressure section compressor respectively, and maintaining the pressure stability of the outlet of the heat exchanger C by the throttle valve J until the pressure requirement is met, and then finishing the air storage process.
Compared with the prior art, the invention has the following beneficial effects:
the compressed air energy storage system for enhancing air storage of the ejector disclosed by the invention has the innovation points that in the air storage process, the compressor unit is matched with the ejector for use, the ejector is a device for carrying and compressing low-pressure fluid by utilizing expansion of high-pressure fluid in a momentum conversion mode, the structure is simple, and the cost is low. According to the ejector, high-pressure air is used for sucking atmospheric air, on one hand, partial pressure energy is recovered, the inlet air flow of a high-pressure air storage tank is increased, the working time of a compressor is shortened, and the energy consumption of the compressor is reduced, on the other hand, the ejector provides intermediate pressure which is greater than the minimum working pressure of the high-pressure air storage tank and is less than or equal to the outlet pressure of a heat exchanger C, the pressure difference of a throttling valve between a high-pressure section compressor and the high-pressure air storage tank is effectively reduced, and the throttling loss is; the second innovation point is that the low-pressure gas storage tank, the medium-pressure gas storage tank, the flow regulating valve B and the flow regulating valve D are matched for use, so that the non-design working condition range of the medium-pressure section compressor and the non-design working condition range of the high-pressure section compressor are reduced.
The invention also discloses a gas storage process of the compressed air energy storage system based on the ejector enhanced gas storage, and in the preparation process of gas storage operation, two gas storage methods are disclosed, wherein the two gas storage methods both use the ejector to recover pressure energy and reduce the electric energy consumption of the compressor, and the second method adopts a method that the compressor works section by section according to the pressure change of the high-pressure gas storage tank, so that the energy consumption of the compressor is further reduced; in the normal working gas storage process, the gas storage process is divided into two situations of always using the ejector and using the ejector in part of time period according to the relative size of the air pressure in the high-pressure gas storage tank and the outlet pressure of the ejector C, and the requirements of different maximum gas storage pressures are met. The gas storage technology strategy that this patent used, the accessible is adjusted corresponding valve and is realized, and simple nimble easy operation has just ensured gas storage process safety and stability operation, provides the reference for compressed air energy storage system's further development.
Drawings
FIG. 1 is a schematic diagram of a compressed air energy storage system with enhanced air storage by an ejector according to the present invention;
wherein: 100 is a low-pressure section compressor; 200 is a medium pressure stage compressor; 300 is a high pressure stage compressor; 110 is heat exchanger A; 210 is heat exchanger B; 310 is heat exchanger C; 130 is an injector A; 230, injector B; 330 is injector C; 510 is a three-way valve A; 520 is a three-way valve C; 530 is a three-way valve E; 540 is a three-way valve F; 550 is a three-way valve G; 120 is a flow regulating valve B; 220 is a flow regulating valve D; 560 is a throttle valve H; 570 is throttle valve I; 580 is a throttle valve J; 140 is a low pressure gas tank; 240 is a medium pressure gas storage tank; 340 is a high-pressure air storage tank; 430 is a booster pump; 420 is a switch valve; 411 a low-temperature heat storage medium storage tank; 412 is a high temperature thermal storage medium tank.
In the figure, the solid line indicates the flow route of air, and the broken line indicates the flow route of the heat storage heat exchange medium.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that the numerical terms used in the specification and claims of the present invention and the above drawings are merely used for distinguishing different apparatuses, and the numerical sizes have no specific meanings. In the specification, claims and drawings of the present invention, the term "low, medium and high" refers to the relative magnitude of the compressed air outlet pressure of the low, medium and high pressure stage compressors in the same air storage system, and means that the atmospheric air is heated and pressurized sequentially through the low pressure stage compressor → the medium pressure stage compressor → the high pressure stage compressor. The low, medium and high pressure gas storage tanks mean that the maximum pressure bearing capacity of the low pressure gas storage tank is less than that of the medium pressure gas storage tank and is less than that of the high pressure gas storage tank in the same energy storage system. The low, medium and high of the compressor or the gas storage tank in different gas storage systems has no practical significance.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the compressed air energy storage system with enhanced gas storage of the ejector of the present invention includes a two-stage heat storage medium storage tank for providing a heat exchange medium, and a low-pressure section gas storage unit, a medium-pressure section gas storage unit, and a high-pressure section gas storage unit connected by a gas transmission pipeline;
the low-pressure section gas storage unit comprises a low-pressure section compressor 100, a heat exchanger A110 and a low-pressure gas storage tank 140, a three-way valve A510 is arranged on a gas transmission pipeline connecting the heat exchanger A110 and the low-pressure gas storage tank 140, and an ejector A130 is further arranged between the three-way valve A510 and the low-pressure gas storage tank 140; the medium-pressure section gas storage unit comprises a medium-pressure section compressor 200, a heat exchanger B210 and a medium-pressure gas storage tank 240, a three-way valve C520 is arranged on a gas transmission pipeline connecting the heat exchanger B210 and the medium-pressure gas storage tank 240, and an ejector B230 is also arranged between the three-way valve C520 and the medium-pressure gas storage tank 240; the high-pressure section gas storage unit comprises a high-pressure section compressor 300, a heat exchanger C310 and a high-pressure gas storage tank 340, wherein a three-way valve E530 is arranged on a gas transmission pipeline connected between the heat exchanger C310 and the high-pressure gas storage tank 340, and an ejector C330 is also arranged between the three-way valve E530 and the high-pressure gas storage tank 340;
a flow regulating valve B120 is arranged on a pipeline connecting the low-pressure gas storage tank 140 and the middle-pressure section compressor 200, and a flow regulating valve D220 is arranged on a pipeline connecting the middle-pressure gas storage tank 240 and the high-pressure section compressor 300; the low pressure gas tank 140, the ejector B230 and the medium pressure gas tank 240 are connected by a three-way valve F540, and the medium pressure gas tank 240, the ejector C330 and the high pressure gas tank 340 are connected by a three-way valve G550;
the two-stage heat storage medium storage tank comprises a low-temperature heat storage medium storage tank 411 and a high-temperature heat storage medium storage tank 412, and the low-temperature heat storage medium storage tank 411 and the high-temperature heat storage medium storage tank 412 are connected with the heat exchanger A110, the heat exchanger B210 or the heat exchanger C310 through heat exchange medium pipelines to realize the transportation of heat exchange media; the outlet end of the low-temperature heat storage medium storage tank 411 is provided with a switch valve 420 and a booster pump 430;
three air inlet branches are further arranged on the high-pressure air storage tank 340, a throttle valve H560 is arranged on a branch connected with the three-way valve G550 and the high-pressure air storage tank 340, a throttle valve I570 is arranged on a branch connected with the ejector C330 and the high-pressure air storage tank 340, and a throttle valve J580 is arranged on a branch connected with the three-way valve E530 and the high-pressure air storage tank 340.
Example 1
The process flow for optimizing the first case of gas storage comprises the following steps: the high-pressure section compressor 300, the middle section compressor 200, the low-pressure section compressor 100, the high-pressure gas storage tank 340, the medium-pressure gas storage tank 240, the low-pressure gas storage tank 140, the ejector A130, the ejector B230, the ejector C330, the three-way valve A510, the three-way valve C520, the three-way valve E530, the three-way valve F540, the three-way valve G550, the flow regulating valve B120, the flow regulator D220, the throttle valve H560, the throttle valve I570, the throttle valve J580, the heat exchanger A110, the heat exchanger B210, the heat exchanger C310, the high-temperature heat storage medium storage tank 412, the low-temperature heat storage medium storage tank 411, the.
In the embodiment 1, in the normal working air storage process of the compressed air energy storage system, the pressure of the high-pressure air storage tank 340 is increased from the minimum working pressure of 4MPa to the maximum working pressure of 7.2MPa, the pressure ratios of the three-stage compressors are all 5, and the rated flow rates are all 50kgs-1The air pressure drop rates of the heat exchanger A110, the heat exchanger B210 and the heat exchanger C310 are all 3%, and the injection ratios of the ejector A130, the ejector B230 and the ejector C330 are all 0.1, the active flow rate is 50kgs-1The mass flow of the injection flow is 5kgs-1The atmospheric air pressure is 0.1MPa, and the volume of the high-pressure gas storage tank is 20000m3。
Example 1 the specific implementation steps are as follows:
1) in the off-peak period of the electricity consumption, the switch valve 420 is opened, and the low-stage compressor 100, the middle-stage compressor 200 and the high-pressure stage compressor 300 are driven to work by the electric energy;
2) atmospheric air enters a low-pressure section compressor 100 to raise the temperature and the pressure (0.5MPa), then enters a heat exchanger A110 to lower the temperature, and air at the outlet of the heat exchanger A110 enters an ejector A130 as active flow, 5kgs-1Atmospheric air (0.1MPa) enters the ejector A130 as an injection flow, and air (0.42MPa) fully mixed by the ejector A130 enters the low-pressure air storage tank 140; the low pressure reservoir 140 has two air outlets, one at 50kgs-1The flow enters a middle-pressure stage compressor 200 for temperature rise and pressure rise, after the temperature is reduced by a heat exchanger B210, air enters an ejector B230 as active flow, and the other path of air of a low-pressure air storage tank 140 is at 5kgs-1The mixed air enters a medium-pressure air storage tank 240 as an injection flow entering an ejector B230; the medium pressure air reservoir 240 has two air outlets, one at 50kgs-1High flow entryThe pressure of the compressor 300 is increased, the air cooled by the heat exchanger C310 enters the ejector C330 as active flow, and the other path of air of the medium-pressure air storage tank 240 is 5kgs-1The flow of the air enters the ejector C330 as an injection flow, the air (7.41MPa) at the outlet of the ejector C330 is injected into the high-pressure air storage tank 340 through the throttle valve I570, the throttle valve I570 maintains the stable outlet pressure of the ejector C330, and when the air pressure in the high-pressure air storage tank 340 is equal to 7.2MPa, the air storage process is finished;
3) the heat storage and exchange process in the gas storage process is as follows: the low-temperature heat storage medium in the low-temperature heat storage medium storage tank 411 is boosted by the booster pump 430, then the low-temperature heat storage medium is respectively conveyed to the heat exchanger a110, the heat exchanger B210 and the heat exchanger C310 to cool the high-temperature air, the warmed low-temperature heat storage medium flows into the high-temperature heat storage medium storage tank 412 uniformly, and the compression heat is managed uniformly.
In example 1, as can be seen from the analysis of the results of the example, the outlet air pressure of the high-pressure stage compressor 300 is maintained at substantially 8.82MPa, the pressure difference of the throttle valve I570 is reduced from 3.41MPa at the beginning of gas storage to 0.21MPa at the end of gas storage, and the inlet mass flow of the high-pressure gas tank 340 is reduced from 50kgs-1Increasing to 55kgs-1(ii) a If the throttle valve and the ejector are not used, the air pressure at the outlet of the high-pressure section compressor 300 is changed along with the pressure in the high-pressure air storage tank 340, and is increased from 4MPa to 7.2 MPa; if a throttle valve is used and no ejector is used, the outlet pressure of the compressor is basically kept at 11.76MPa, and the pressure difference of the throttle valve is reduced from 7.41MPa of the beginning of gas storage to 4.21MPa of the end of gas storage. According to the results, the ejector and the throttle valve are matched in the gas storage process, so that the fluctuation of the air pressure of the outlet at the tail end of the compressor unit can be effectively reduced, in addition, the inlet flow of the gas storage tank can be increased by the ejector, partial pressure energy can be recycled, the working time of the compressor is shortened, and the total energy consumption of the compressor is reduced.
Example 2
Referring to fig. 1, the present embodiment is a gas storage optimization process designed in the second gas storage situation, which includes: the high-pressure section compressor 300, the middle section compressor 200, the low-pressure section compressor 100, the high-pressure gas storage tank 340, the medium-pressure gas storage tank 240, the low-pressure gas storage tank 140, the ejector A130, the ejector B230, the ejector C330, the three-way valve A510, the three-way valve C520, the three-way valve E530, the three-way valve F540, the three-way valve G550, the flow regulating valve B120, the flow regulator D220, the throttle valve H560, the throttle valve I570, the throttle valve J580, the heat exchanger A110, the heat exchanger B210, the heat exchanger C310, the high-temperature heat storage medium storage tank 412, the low-temperature heat storage medium storage tank 411.
In example 2, a normal operation air storage process is shown, which is divided into two stages, the first stage using the ejector, and when the air pressure in the high pressure air storage tank is equal to the outlet pressure of the ejector C330, the second stage is started, the relevant valve is adjusted to stop the ejector, and the high pressure air storage tank is charged with the outlet air of the heat exchanger C310.
After the compressed air energy storage system enters normal air storage operation, the air pressure in the high-pressure air storage tank 340 is increased from the minimum working pressure of 4MPa to the maximum working pressure of 10MPa, the pressure ratios of the high-pressure section compressor 300, the medium-pressure section compressor 200 and the low-pressure section compressor 100 are respectively 4, 5 and 6, and the rated flow is 50kg s-1The air pressure drop rates of the heat exchanger A110, the heat exchanger B210 and the heat exchanger C310 are all 3%, the injection ratios of the ejector A130, the ejector B230 and the ejector C330 are all 0.12, the atmospheric air pressure is 0.1MPa, and the volume of the high-pressure gas storage tank is 20000m3。
Example 2 the specific implementation steps are as follows:
1) in the off-peak period of the electricity consumption, the switch valve 420 is opened, and the low-pressure section compressor 100, the medium-pressure section compressor 200 and the high-pressure section compressor 300 are driven to work by the electric energy;
2) a first gas storage stage: atmospheric air enters the low-pressure section compressor 100, then is heated and pressurized (0.6MPa), then enters the heat exchanger A110 for cooling, the air at the outlet of the heat exchanger A110 enters the ejector A130 as active flow, 6kg s-1The air (0.1MPa) in the atmosphere enters the ejector A130 as an injection flow, and the air (0.48MPa) fully mixed by the ejector A130 enters the low-pressure air storage tank 140; one path of air in the low-pressure air storage tank 140 is 50kgs-1The flow rate of the refrigerant enters the middle-pressure stage compressor 200 to be heated and boosted, and then is changedThe air cooled by the heat exchanger B210 enters the ejector B230 as the active flow, and the other path of air of the low-pressure air storage tank 140 takes 6kgs-1The mixed air enters a medium-pressure air storage tank 240 as an injection flow entering an ejector B230; one path of air in the medium pressure air storage tank 240 is 50kgs-1The flow enters a high-pressure section compressor 300 for temperature and pressure rise, the air cooled by a heat exchanger C310 enters an ejector C330 as active flow, and the other path of air of a medium-pressure air storage tank 240 enters 6kgs-1The flow of the air is used as an injection flow to enter the ejector C330, the air (6.62MPa) at the outlet of the ejector C330 is injected into the high-pressure air storage tank 340 through the throttle valve I570, the throttle valve I570 maintains the stable air pressure at the outlet of the ejector C330, and when the air pressure in the high-pressure air storage tank is equal to the outlet pressure of the ejector C330, the first stage of air storage is finished;
3) and a second gas storage stage: adjusting three-way valves A510, C520, E530, F540 and G550 to stop operation of injectors A130, B230 and C330; atmospheric air enters a low-pressure stage compressor 100 to be heated and boosted, the air cooled by a heat exchanger A110 enters a low-pressure air storage tank 140, outlet air of the low-pressure air storage tank 140 enters a medium-pressure stage compressor 200 to be heated and boosted, the air cooled by a heat exchanger B210 enters a medium-pressure air storage tank, outlet air of the medium-pressure air storage tank 240 enters a high-pressure stage compressor 300 to be heated and boosted, then the air passing through a heat exchanger C310 is injected into a high-pressure air storage tank 340 through a throttle valve J580, the pressure of the outlet air of the heat exchanger C310 is maintained to be stable by the J throttle valve 580, and when the air pressure in;
4) the heat storage and exchange process in the gas storage process is as follows: the low-temperature heat storage medium in the low-temperature heat storage medium storage tank 411 is boosted by the booster pump 430, then the low-temperature heat storage medium is respectively conveyed to the heat exchanger A110, the heat exchanger B210 and the heat exchanger C310 to cool the high-temperature air, and the warmed low-temperature heat storage medium flows into the high-temperature heat storage medium storage tank 412 to uniformly manage the compression heat; the use of the ejector will slightly lower the temperature of the compressor inlet air, so the flow rates of the heat exchange medium in the air storage first and second stages in the respective heat exchangers are slightly different, and the opening degree of the on-off valve 420 needs to be adjusted to meet different requirements for the flow rate of the heat exchange medium.
In the normal gas storage process of example 2, the first gas storage stage and the second gas storage stage, the outlet pressure of the high-pressure stage compressor 300 is 7.89MPa and 11.29MPa, respectively, the differential pressure of the throttle valve I570 is reduced from 2.62MPa to 0MPa, and the differential pressure of the throttle valve J580 is reduced from 4.33MPa to 0.95 MPa; when the ejector and the throttle valve are not used in the gas storage process, the outlet pressure of the high-pressure section compressor 300 is increased from 4.12MPa to 11.29 MPa; when a throttling valve is used in the gas storage process and an ejector is not used, the outlet pressure of the high-pressure section compressor 300 is kept at about 11.29MPa, and the differential pressure of the throttling valve J580 is reduced from 6.95MPa to 0.95 MPa. Through the comparative analysis of the results, the ejector is used in the gas storage process, partial pressure energy can be effectively recovered, the inlet flow of the high-pressure gas storage tank is increased, the working time of a compressor unit is shortened, and the energy consumption of the compressor is reduced; in addition, the pressure provided by the ejector is greater than the minimum working pressure and less than the outlet pressure of the heat exchanger C310, so that the pressure difference of the throttle valve can be effectively reduced, and the throttling loss of the throttle valve is reduced.
In summary, the advantages of the invention are as follows:
1. the novel compressed air energy storage system has the advantages of compact structure, simplicity in operation, flexibility, reliability, safety, stability, high efficiency and energy conservation;
2. compared with the traditional compressed air energy storage system, the ejector is used in the air storage process, partial pressure energy of high-pressure air is recovered, the mass flow of the inlet of the high-pressure air storage tank is increased, the intermediate pressure provided by the ejector effectively reduces the throttling differential pressure loss at the throttling valve, and the pressure fluctuation of the outlet of the compressor is reduced due to the cooperation of the ejector and the throttling valve;
3. in the gas storage process, the low-pressure gas storage tank and the medium-pressure gas storage tank are respectively matched with the flow regulating valve B, D for use, so that the working flow of the inlet of the compressor can be effectively controlled, the working flow of the compressor is controlled within a stable working range, the non-design working condition range of the compressor at the medium-pressure section and the high-pressure section is reduced, and the working efficiency of the compressor is improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A compressed air energy storage system with an ejector for strengthening air storage is characterized by comprising a two-stage heat storage medium storage tank for providing a heat exchange medium, and a low-pressure section air storage unit, a medium-pressure section air storage unit and a high-pressure section air storage unit which are connected through an air transmission pipeline;
the low-pressure section gas storage unit comprises a low-pressure section compressor (100), a heat exchanger A (110) and a low-pressure gas storage tank (140), a three-way valve A (510) is arranged on a gas transmission pipeline connecting the heat exchanger A (110) and the low-pressure gas storage tank (140), and an ejector A (130) is arranged between the three-way valve A (510) and the low-pressure gas storage tank (140); the medium-pressure section gas storage unit comprises a medium-pressure section compressor (200), a heat exchanger B (210) and a medium-pressure gas storage tank (240), a three-way valve C (520) is arranged on a gas transmission pipeline connecting the heat exchanger B (210) with the medium-pressure gas storage tank (240), and an ejector B (230) is also arranged between the three-way valve C (520) and the medium-pressure gas storage tank (240); the high-pressure section gas storage unit comprises a high-pressure section compressor (300), a heat exchanger C (310) and a high-pressure gas storage tank (340), a three-way valve E (530) is arranged on a gas transmission pipeline connecting the heat exchanger C (310) and the high-pressure gas storage tank (340), and an ejector C (330) is arranged between the three-way valve E (530) and the high-pressure gas storage tank (340);
a flow regulating valve B (120) is arranged on a pipeline connecting the low-pressure gas storage tank (140) and the middle-pressure section compressor (200), and a flow regulating valve D (220) is arranged on a pipeline connecting the middle-pressure gas storage tank (240) and the high-pressure section compressor (300); the low-pressure air storage tank (140), the ejector B (230) and the medium-pressure air storage tank (240) are connected through a three-way valve F (540), and the medium-pressure air storage tank (240), the ejector C (330) and the high-pressure air storage tank (340) are connected through a three-way valve G (550);
the two-stage heat storage medium storage tank comprises a low-temperature heat storage medium storage tank (411) and a high-temperature heat storage medium storage tank (412), and the low-temperature heat storage medium storage tank (411) and the high-temperature heat storage medium storage tank (412) are connected with the heat exchanger A (110), the heat exchanger B (210) or the heat exchanger C (310) through heat exchange medium pipelines to realize the transportation of a heat exchange medium; a switch valve (420) and a booster pump (430) are arranged at the outlet end of the low-temperature heat storage medium storage tank (411);
three air inlet branches are further arranged on the high-pressure air storage tank (340), a throttle valve H (560) is arranged on a branch connected with the three-way valve G (550) and the high-pressure air storage tank (340), a throttle valve I (570) is arranged on a branch connected with the ejector C (330) and the high-pressure air storage tank (340), and a throttle valve J (580) is arranged on a branch connected with the three-way valve E (530) and the high-pressure air storage tank (340).
2. The compressed air energy storage system with enhanced air storage of the ejector according to claim 1, wherein the low-pressure stage compressor (100), the middle-pressure stage compressor (200) and the high-pressure stage compressor (300) comprise a number of compressor stages which is not less than 1.
3. The ejector enhanced storage compressed air energy storage system of claim 1, wherein the low pressure tank (140) and the medium pressure tank (240) have a smaller volume than the high pressure tank (340).
4. The compressed air energy storage system with enhanced air storage by injector as claimed in claim 1, wherein the heat storage and exchange media in the low temperature heat storage medium storage tank (411) and the high temperature heat storage medium storage tank (412) are the same liquid media.
5. The compressed air energy storage system with enhanced air storage of the ejector according to claim 1, wherein the heat exchanger A (110), the heat exchanger B (210) and the heat exchanger (310) adopt dividing wall type heat exchange, and are selected from a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger or a plate type heat exchanger.
6. A gas storage process using the compressed air energy storage system for enhancing gas storage of the ejector according to any one of claims 1 to 5, comprising: running a preparation process and a normal working gas storage process;
the operation preparation process means that the pressure in the high-pressure air storage tank (340) is increased from the atmospheric pressure to the minimum working pressure;
the normal working gas storage process refers to the process that the pressure in the high-pressure gas storage tank (340) is increased from the minimum working pressure of the energy storage system until the pressure is increased to the maximum working pressure of the energy storage system.
7. The gas storage process according to claim 6, wherein the operation preparation process comprises two inflation methods, specifically as follows:
the method comprises the following steps:
the low-pressure section compressor (100), the medium-pressure section compressor (200) and the high-pressure section compressor (300) are driven to work simultaneously, a part of air enters the low-pressure section compressor (100) to be heated and pressurized, is cooled by the heat exchanger A (110) and then enters the ejector A (130) as active flow, the other part of air enters the ejector A (130) as injection flow, and air at the outlet of the ejector A (130) is injected into the low-pressure air storage tank (140);
the low-pressure air storage tank (140) is provided with two air outlets, wherein one air outlet enters the medium-pressure section compressor (200) to be heated and pressurized, then enters the heat exchanger B (210) to be cooled, and then enters the ejector B (230) as a driving flow, the other air outlet of the low-pressure air storage tank (140) enters the ejector B (230) as an injection flow, and the air outlet of the ejector B (230) is injected into the medium-pressure air storage tank (240);
the medium-pressure air storage tank (240) is also provided with two air outlets, one air outlet enters the high-pressure section compressor (300) for temperature and pressure rise, the temperature is reduced by the heat exchanger C (310), the air enters the ejector C (330) as active flow, the other air outlet of the medium-pressure air storage tank (240) enters the ejector C (330) as ejection flow, the air outlet of the ejector C (330) is injected into the high-pressure air storage tank (340) through the throttle valve I (570), and the throttle valve I (570) maintains the outlet pressure of the ejector C (330) to be stable; when the air pressure in the high-pressure air storage tank (340) is increased to be equal to the minimum working pressure of the energy storage system, the operation preparation process is completed;
the second method comprises the following steps:
the low-pressure section compressor (100), the medium-pressure section compressor (200) and the high-pressure section compressor (300) are driven to work step by step, a part of air enters the low-pressure section compressor (100) to be heated and pressurized, is cooled by the heat exchanger A (110) and then enters the ejector A (130) as active flow, the other part of air enters the ejector A (130) as injection flow, and air at the outlet of the ejector A (130) is injected into the low-pressure air storage tank (140); the air at the outlet of the low-pressure air storage tank (140) enters the medium-pressure air storage tank (240) through a three-way valve F (540), and then enters the high-pressure air storage tank (340) through a three-way valve G (550), so that the air at the outlet of the ejector A (230) is inflated to the high-pressure air storage tank, and the pressure at the outlet of the ejector A (130) is maintained to be stable by a throttle valve H (560);
when the air pressure in the high-pressure air storage tank (340) is increased from the atmospheric pressure to the outlet pressure of the ejector A (130), the flow regulating valve B (120) and the three-way valve F (540) are adjusted to enable the middle-pressure section compressor (200) and the ejector B (230) to work, air in the low-pressure air storage tank 140, one path of the air enters a middle-pressure section compressor (200) for temperature and pressure rise, is cooled by a heat exchanger B (210) and then enters an ejector B (230) as active flow, meanwhile, the other path of air of the low-pressure air storage tank (140) enters an ejector B (230) as an injection flow, the air at the outlet of the ejector B (230) is injected into a medium-pressure air storage tank (240), and then enters a high-pressure air storage tank (340) through a three-way valve G (550) and a throttle valve H (560), so that the high-pressure air storage tank (340) is inflated by the air at the outlet of the ejector B (230), and the throttle valve H (560) maintains the stable pressure at the outlet of the ejector B (230);
when the air pressure in the high-pressure air storage tank (340) is increased from the outlet pressure of the ejector A (130) to the outlet pressure of the ejector B (230), the high-pressure air storage tank is divided into a flow regulating valve D (220) and a three-way valve G (550), so that the high-pressure section compressor (300) and the ejector C (330) work, one path of air in the medium-pressure air storage tank (240) enters the high-pressure section compressor (300) for temperature and pressure increase, is cooled by the heat exchanger C (310) and then enters the ejector C (330) as active flow, meanwhile, the other path of air in the medium-pressure air storage tank (240) enters the ejector C (330) as injection flow, the outlet air of the ejector C (330) is injected into the high-pressure air storage tank (340) through a throttle valve I (570), the throttle valve I (570) maintains the outlet pressure of the ejector C (330) to be, the initial gas storage process is completed.
8. Gas storage process according to claim 6, characterized in that said normal working gas storage process comprises two situations;
the first situation is as follows:
when the maximum working pressure in the high-pressure air storage tank (340) is smaller than the outlet air pressure of the ejector C (330), the low-pressure section compressor (100), the medium-pressure section compressor (200), the high-pressure section compressor (300), the ejector A (130), the ejector B (230) and the ejector C (330) work simultaneously, and the high-pressure air storage tank (340) is inflated by the outlet air of the ejector C (330);
the specific process is as follows: atmospheric air enters a low-pressure section compressor (100) for temperature rise and pressure rise, is cooled by a heat exchanger A (110) and enters an ejector A (130) as active flow, the other part of atmospheric air enters the ejector A (130) as injection flow, and air at the outlet of the ejector A (130) is injected into a low-pressure air storage tank (140); the low-pressure air storage tank (140) is provided with two air outlets, wherein one air outlet enters the medium-pressure section compressor (200) to be heated and pressurized, then enters the heat exchanger B (210) to be cooled, and then enters the ejector B (230) as a driving flow, the other air outlet of the low-pressure air storage tank (140) enters the ejector B (230) as an injection flow, and the air outlet of the ejector B (230) is injected into the medium-pressure air storage tank (240); the medium-pressure air storage tank (240) is also provided with two air outlets, one air outlet enters the high-pressure section compressor (300) for temperature and pressure rise, the temperature is reduced by the heat exchanger C (310), then the air enters the ejector C (330) as active flow, the other air from the medium-pressure air storage tank (240) enters the ejector C (330) as ejection flow, the air from the ejector C (330) is injected into the high-pressure air storage tank (340) through the throttle valve I (570), and the throttle valve I (570) maintains the stable outlet pressure of the ejector C (330); when the air pressure in the high-pressure air storage tank (340) is increased to be equal to the maximum working pressure of the energy storage system, the air storage process is finished;
case two:
when the maximum working pressure of the air storage system is larger than the outlet air pressure of the ejector C (330), firstly, the high-pressure air storage tank (340) is inflated by using a scheme of the situation one, when the air pressure in the high-pressure air storage tank (340) is increased to be equal to the outlet air pressure of the ejector C (330), the three-way valve A (510), the three-way valve C (520) and the three-way valve E (530) are adjusted, the ejector A (130), the ejector B (230) and the ejector C (330) stop working, respectively, the outlet air of the heat exchanger A (110) directly enters the low-pressure air storage tank (140), the outlet air of the heat exchanger B (210) directly enters the medium-pressure air storage tank (240), the outlet air of the heat exchanger C (310) enters the high-pressure air storage tank (340) through the regulating valve J (580), and simultaneously, the three-way valve F, air in the medium-pressure air storage tank (240) enters the high-pressure section compressor (300), and the throttle valve J (580) maintains the pressure at the outlet of the heat exchanger C (310) to be stable until the pressure requirement is met, and then the air storage process is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360560.7A CN111075695B (en) | 2019-12-25 | 2019-12-25 | Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360560.7A CN111075695B (en) | 2019-12-25 | 2019-12-25 | Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111075695A CN111075695A (en) | 2020-04-28 |
| CN111075695B true CN111075695B (en) | 2021-01-19 |
Family
ID=70318017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911360560.7A Active CN111075695B (en) | 2019-12-25 | 2019-12-25 | Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111075695B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4299907A1 (en) * | 2022-06-29 | 2024-01-03 | Ingersoll-Rand Industrial U.S., Inc. | Coolant circulation system for multi-stage compressor assembly |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412749A (en) * | 2021-11-30 | 2022-04-29 | 西安交通大学 | Compressed air energy storage system and method for sliding pressure operation of ejector combined compressor unit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1034657A (en) * | 1996-07-19 | 1998-02-10 | Taiho Kogyo Kk | Heating and cooling apparatus for mold |
| US20040055621A1 (en) * | 2002-09-24 | 2004-03-25 | Air Products And Chemicals, Inc. | Processing of semiconductor components with dense processing fluids and ultrasonic energy |
| CN104806313B (en) * | 2015-05-06 | 2016-05-25 | 中国科学院工程热物理研究所 | A kind of isotherm compression air energy-storage system and method |
| KR102295431B1 (en) * | 2017-06-08 | 2021-09-01 | 삼성중공업 주식회사 | Fuel gas supply system |
| CN209586452U (en) * | 2018-12-05 | 2019-11-05 | 中储国能(北京)技术有限公司 | A kind of jet expansion compound compression air energy storage systems |
| CN109854320B (en) * | 2019-01-03 | 2021-12-03 | 上海海事大学 | Carbon dioxide energy storage and organic Rankine cycle combined power generation system |
| CN109915345B (en) * | 2019-04-23 | 2020-01-10 | 山东大学 | Multi-stage optimization compressed air energy storage system with ejector and method |
-
2019
- 2019-12-25 CN CN201911360560.7A patent/CN111075695B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4299907A1 (en) * | 2022-06-29 | 2024-01-03 | Ingersoll-Rand Industrial U.S., Inc. | Coolant circulation system for multi-stage compressor assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111075695A (en) | 2020-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108930627B (en) | Constant-pressure water pumping compressed gas energy storage system and energy storage method | |
| US9217423B2 (en) | Energy storage system using supercritical air | |
| CN109505666B (en) | Injection expansion combined type compressed air energy storage system | |
| CN111396288B (en) | Power generation system based on constant pressure | |
| CN111075695B (en) | Compressed air energy storage system with ejector capable of enhancing air storage and air storage process of compressed air energy storage system | |
| CN114198170A (en) | Carbon dioxide energy storage system based on double heat storage loops and working method thereof | |
| CN217737678U (en) | Liquefied air energy storage system of coupling LNG cold energy and ORC | |
| CN209586452U (en) | A kind of jet expansion compound compression air energy storage systems | |
| CN114033517B (en) | Geothermal power generation and cold and hot supply system based on carbon dioxide compression energy storage and operation method | |
| CN108953099B (en) | Closed type isobaric compressed air energy storage system and method | |
| CN112412561B (en) | Coupling control method for compressed air energy storage system and thermal power plant control system | |
| CN109915345A (en) | A kind of compressed-air energy-storage system and method with injector multilevel optimization | |
| CN115788745A (en) | Water pumping compressed air energy storage system with adjustable water head and operation method | |
| CN112901431B (en) | Near-isothermal compressed air energy storage system and operation method thereof | |
| CN113294243A (en) | Combined energy storage power generation system of hydrogen and liquid air | |
| CN211975319U (en) | Power generation system | |
| CN113339088A (en) | Temperature and pressure cooperative control water photovoltaic coupling compressed carbon dioxide energy storage system and method | |
| CN114991897B (en) | Multistage expanded liquid carbon dioxide mixture energy storage system and pressure regulating method | |
| CN111140297A (en) | High-energy-density energy storage and release system and energy storage and release method | |
| CN215633352U (en) | Combined energy storage power generation system of hydrogen and liquid air | |
| CN115898829A (en) | CAES system shared by modularly configured heat exchange systems and use method | |
| CN111535886B (en) | Multi-energy combined constant-pressure power generation system | |
| CN109899217B (en) | Water-gas composite energy storage power generation system and method | |
| CN103184906B (en) | The method of energy supply and device | |
| CN117266944B (en) | Adiabatic compressed air energy storage system based on temperature control of air storage tank |
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 |