CN118826303B - Carbon dioxide energy storage method, carbon dioxide energy storage device and control method thereof - Google Patents
Carbon dioxide energy storage method, carbon dioxide energy storage device and control method thereof Download PDFInfo
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- CN118826303B CN118826303B CN202411198301.XA CN202411198301A CN118826303B CN 118826303 B CN118826303 B CN 118826303B CN 202411198301 A CN202411198301 A CN 202411198301A CN 118826303 B CN118826303 B CN 118826303B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0438—Cooling or heating systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/006—Accumulators and steam compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- 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
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Abstract
The application belongs to the technical field of energy storage, and provides a carbon dioxide energy storage method, a carbon dioxide energy storage device and a control method thereof, comprising a gas storage, an energy storage component, a purification component, a liquid storage tank and an energy release component which are connected in sequence, the energy storage component is used for compressing and then cooling the first mixed fluid which flows out of the gas storage and comprises gaseous carbon dioxide and gaseous water to obtain a second mixed fluid. The purification component is used for separating liquid water from the second mixed fluid, cooling and liquefying gaseous carbon dioxide in the second mixed fluid into liquid carbon dioxide, storing the liquid carbon dioxide in the liquid storage tank, and the energy release component is used for enabling the liquid carbon dioxide flowing out of the liquid storage tank to absorb heat and raise temperature into the gaseous carbon dioxide, and storing the gaseous carbon dioxide in the gas storage tank after expansion work. The carbon dioxide energy storage device provided by the application can be used for on-line dehydration with lower energy consumption in the energy storage process, so that corrosion of devices such as a pipeline, a liquid storage tank and the like of the energy storage device is avoided, and the operation safety of the carbon dioxide energy storage device is improved.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a carbon dioxide energy storage method, a carbon dioxide energy storage device and a control method thereof.
Background
The carbon dioxide energy storage technology is an energy storage technology which takes carbon dioxide as a circulating working medium and utilizes the mutual conversion of gas and liquid of the carbon dioxide and the cooperation of two states to store and release energy, and can be used for peak clipping and valley filling, adjusting the energy load of a power grid and stabilizing the frequency of the power grid.
The operation principle of the carbon dioxide energy storage device is that when redundant electric power is required to be stored, the device can compress gaseous carbon dioxide in the gas storage into high-temperature and high-pressure gas by utilizing the redundant electric power, and the high-temperature and high-pressure carbon dioxide gas is condensed into liquid after heat energy is stored by the heat storage working medium and is stored in the storage tank, so that the conversion from redundant electric energy to pressure energy and internal energy is realized. When energy release is needed, the device can utilize stored heat energy to heat liquid carbon dioxide to a gaseous state, the gaseous carbon dioxide drives the turbine to drive the generator to generate electricity, the conversion of compression energy and internal energy into electric energy is realized, and the gaseous carbon dioxide after acting can be returned to the gas storage for recycling.
The carbon dioxide energy storage device has the advantages of simple structure, safety, reliability and high efficiency, however, in the running process of the carbon dioxide energy storage device, the devices such as a pipeline, a liquid storage tank and the like of the carbon dioxide energy storage device are easily corroded by working media, and serious threat is caused to the running of the device.
Disclosure of Invention
The embodiment of the application aims to provide a carbon dioxide energy storage method, a carbon dioxide energy storage device and a control method thereof, which are used for solving the technical problem that devices such as a pipeline and a liquid storage tank of the carbon dioxide energy storage device are easy to corrode in the prior art.
In order to achieve the above purpose, the application adopts the following technical scheme:
According to the first aspect, the carbon dioxide energy storage device comprises a gas storage, an energy storage component, a purification component, a liquid storage tank and an energy release component which are sequentially connected, wherein the energy storage component is used for compressing a first mixed fluid which flows out of the gas storage and comprises gaseous carbon dioxide and gaseous water and then cooling the first mixed fluid to obtain a second mixed fluid, the second mixed fluid comprises gaseous carbon dioxide, the purification component is used for separating liquid water from the second mixed fluid, cooling and liquefying the gaseous carbon dioxide in the second mixed fluid into liquid carbon dioxide and storing the liquid carbon dioxide in the liquid storage tank, and the energy release component is used for enabling the liquid carbon dioxide flowing out of the liquid storage tank to absorb heat and heat into gaseous carbon dioxide and performing expansion work and storing the gaseous carbon dioxide in the gas storage tank.
In some embodiments, the purifying assembly comprises a shell and a cooling pipe, wherein the shell is provided with a containing cavity, a mixed fluid inlet, a first outlet and a second outlet, the mixed fluid inlet, the first outlet and the second outlet are respectively communicated with the containing cavity, the cooling pipe is arranged in the containing cavity and is used for enabling a first cold fluid to circulate so as to cool and liquefy the second mixed fluid, the setting height of the mixed fluid inlet is higher than that of the first outlet and the second outlet, the first outlet is used for enabling liquid water to flow out of the containing cavity, and the second outlet is used for enabling liquid carbon dioxide to flow out of the containing cavity.
In some embodiments, the first outlet is disposed at a lower elevation than the second outlet.
In some embodiments, the purification assembly further comprises a partition plate disposed at the bottom of the accommodating cavity and dividing the bottom of the accommodating cavity into a first groove and a second groove sequentially disposed along the horizontal direction, the first groove is communicated with the first outlet, the second groove is communicated with the second outlet, and the cooling tube is disposed above the first groove.
In some embodiments, the purifying assembly further comprises a controller, and a first pressure sensor, a second pressure sensor, a temperature sensor and a liquid level sensor which are respectively connected with the controller in an electric signal mode, wherein the first pressure sensor is used for measuring gas phase pressure in the accommodating cavity, the temperature sensor is used for measuring temperature in the accommodating cavity, the liquid level sensor is used for measuring liquid level in the accommodating cavity, the second pressure sensor is used for measuring pressure born by the bottom wall of the accommodating cavity when the setting height of the first outlet is lower than that of the second outlet, and the second pressure sensor is used for measuring pressure born by the bottom wall of the first groove when the purifying assembly further comprises a partition plate.
In some embodiments, the shell is further provided with a cold fluid outlet and a cold fluid inlet which are arranged up and down, two ends of the cooling pipe are respectively communicated with the cold fluid outlet and the cold fluid inlet, the purifying assembly further comprises a guide plate, the guide plate is arranged on the cavity wall of the accommodating cavity, the setting height of the guide plate on the cavity wall of the accommodating cavity is higher than the setting height of the cold fluid inlet and is lower than the setting height of the mixed fluid inlet, and at least part of the area of the guide plate is gradually inclined upwards in the direction from the outer side to the inner side of the accommodating cavity.
In some embodiments, a first gas impurity outlet is further provided at the top of the housing, and the first gas impurity outlet is in communication with the accommodating cavity.
In some embodiments, the purification assembly further comprises a separation element disposed within the receiving chamber and between the mixed fluid inlet and the first gaseous impurity outlet for capturing liquid droplets.
In some embodiments, the purification assembly comprises a first separator for separating liquid water from the second mixed fluid to obtain a third mixed fluid and a cooler for liquefying the third mixed fluid to obtain a fourth mixed fluid, the energy storage assembly, the first separator, the cooler, and the reservoir being connected in sequence.
In some embodiments, the first mixed fluid further comprises a gas impurity, the cooler is provided with a shell side and a tube side, the shell side and the tube side are respectively used for enabling the third mixed fluid to circulate with a second cold fluid, a second gas impurity outlet is arranged at the top of the cooler, and the second gas impurity outlet is communicated with the shell side and used for enabling the gas impurity in the third mixed fluid to flow out of the shell side.
In some embodiments, the purification assembly further comprises a second separator disposed between the cooler and the reservoir for separating liquid water from the fourth mixed fluid.
In some embodiments, the carbon dioxide energy storage device further comprises a third separator disposed on an inlet side of the liquid storage tank for separating liquid water from fluid flowing into the liquid storage tank.
In some embodiments, the carbon dioxide energy storage device further comprises a delivery pump and a fourth separator, the delivery pump, the fourth separator and the liquid storage tank are sequentially connected in a closed loop, and the delivery pump is used for pumping the liquid fluid in the liquid storage tank to the fourth separator to remove the liquid water and then pumping the liquid fluid back to the liquid storage tank.
In a second aspect, a carbon dioxide energy storage method is provided, the carbon dioxide energy storage method being implemented by the carbon dioxide energy storage device provided in the first aspect, the carbon dioxide energy storage method comprising:
pressurizing and cooling a first mixed fluid comprising gaseous carbon dioxide and gaseous water to obtain a second mixed fluid;
Liquefying the gaseous water in the second mixed fluid into liquid water, and liquefying the gaseous carbon dioxide cooling liquid in the second mixed fluid into liquid carbon dioxide;
Liquid carbon dioxide and liquid water are separated by liquid-liquid separation.
In a third aspect, a carbon dioxide energy storage method is provided, which is implemented by the carbon dioxide energy storage device provided in the first aspect, and the carbon dioxide energy storage method includes:
pressurizing and then cooling a first mixed fluid comprising gaseous carbon dioxide and gaseous water, so that the gaseous water in the first mixed fluid is at least partially condensed into liquid water, and the gaseous carbon dioxide in the first mixed fluid is kept in a gaseous state to obtain a second mixed fluid;
separating liquid water from the second mixed fluid in a gas-liquid separation mode to obtain a third mixed fluid;
and cooling and liquefying the third mixed fluid to obtain a fourth mixed fluid.
In a fourth aspect, a control method of a carbon dioxide energy storage device is provided, where the control method of the carbon dioxide energy storage device is implemented by the carbon dioxide energy storage device, and the control method of the carbon dioxide energy storage device includes:
Acquiring the gas phase temperature in the accommodating cavity Pressure of gas phaseLiquid levelAnd the liquid phase pressure of the bottom of the liquid water below the liquid carbon dioxide in the accommodating cavity;
Regulating the first cold fluid and at least one of temperature, flow rate and composition to make the gas phase temperatureAnd a preset gas phase temperatureDeviation of less than a preset temperature differenceAnd subjecting the gas phase to pressureAnd preset gas phase pressureIs less than the first preset pressure difference;
When the liquid phase pressure isAnd (3) withIs greater than a second predetermined pressure differenceAt the same time, controlling the first outlet to open and discharge liquid water until the liquid phase pressure valueAnd (3) withThe difference value is smaller than or equal to the second preset pressure difference valueWherein, the method comprises the steps of, wherein,For the preset water level value of the liquid water,Is the gas phase pressure valueAnd gas phase temperature valueThe density of the liquid carbon dioxide under it,Is the gas phase pressure valueAnd gas phase temperature valueThe density of the liquid water at normal temperature and normal pressure.
Compared with the prior art, the carbon dioxide energy storage device has the advantages that the purification component is arranged between the energy storage component and the liquid storage tank, the carbon dioxide energy storage device is used for compressing first mixed fluid in the gas storage tank to high temperature and high pressure in the process of energy storage in the carbon dioxide energy storage device, the high temperature and high pressure mixed gas is cooled and liquefied to liquid after being stored by the heat exchange device, so that the conversion from surplus electric energy to pressure energy and internal energy is realized, after the purification component is arranged between the energy storage component and the liquid storage tank, the purification component can directly separate liquid water by means of compression energy and cold energy which are required to be consumed in the energy storage process, the purity of carbon dioxide in the carbon dioxide energy storage device can be improved, corrosion of devices such as pipelines and liquid storage tanks of the energy storage device is avoided as much as possible, the operation safety of the carbon dioxide energy storage device is improved, on one hand, the purification component can directly separate the liquid water by means of compression energy and cold energy which are required to be consumed in the energy storage process, and on the other hand, the extra energy required for dewatering operation can be reduced, and on-line dewatering effect can be avoided due to the fact that the dewatering energy storage device is required to be stopped.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 2 is a schematic diagram of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 3 is a schematic diagram of a front view of a purification assembly of a carbon dioxide energy storage device according to some embodiments of the present application, with internal components of the purification assembly in a perspective state;
FIG. 4 is a schematic top view of a purification assembly of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 5 is a schematic diagram of a front view of a purification assembly of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 6 is a schematic diagram of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 7 is a schematic diagram of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 8 is a schematic diagram of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 9 is a schematic diagram of a partial structure of a carbon dioxide energy storage device according to some embodiments of the present application;
FIG. 10 is a flow chart of a carbon dioxide energy storage method according to some embodiments of the present application;
FIG. 11 is a flow chart of a carbon dioxide energy storage method according to some embodiments of the present application;
FIG. 12 is a block diagram of a controller, temperature sensor, level sensor, first pressure sensor, and second pressure sensor for a carbon dioxide energy storage device according to some embodiments of the application.
Wherein, each reference sign in the figure:
100. a gas storage;
200. an energy storage assembly; 210, a compressor, 220, an energy storage heat exchanger;
300. purifying module, 310, housing, 311, holding chamber, 3111, first tank, 3112, second tank, 312, mixed fluid inlet, 313, first outlet, 314, second outlet, 315, first gas impurity outlet, 316, cold fluid outlet, 317, cold fluid inlet, 320, baffle, 330, cooling tube, 340, baffle, 341, first diversion section, 342, second diversion section, 350, separating element, 360, first separator, 361, dehydration column, 362, gas impurity separator, 370, cooler, 371, shell side, 372, tube side, 373, second gas impurity outlet, 380, second separator, 391, controller, 392, first pressure sensor, 393, second pressure sensor, 394, temperature sensor, 395, liquid level sensor;
400. a liquid storage tank;
500. the system comprises an energy release assembly, 510, an energy release heat exchanger, 520 and an expander;
600. A third separator;
700. a transfer pump;
800. and a fourth separator.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The carbon dioxide energy storage technology is an energy storage technology which takes carbon dioxide as a circulating working medium and utilizes the mutual conversion of gas and liquid of the carbon dioxide and the cooperation of two states to store and release energy, and can be used for peak clipping and valley filling, adjusting the energy load of a power grid and stabilizing the frequency of the power grid.
The operation principle of the carbon dioxide energy storage device is that when redundant electric power is required to be stored, the device can compress gaseous carbon dioxide in the gas storage into high-temperature and high-pressure gas by utilizing the redundant electric power, and the high-temperature and high-pressure carbon dioxide gas is condensed into liquid after heat energy is stored by the heat storage working medium and is stored in the storage tank, so that the conversion from redundant electric energy to pressure energy and internal energy is realized. When energy release is needed, the device can utilize stored heat energy to heat liquid carbon dioxide to a gaseous state, the gaseous carbon dioxide drives the turbine to drive the generator to generate electricity, the conversion of compression energy and internal energy into electric energy is realized, and the gaseous carbon dioxide after acting can be returned to the gas storage for recycling.
The carbon dioxide energy storage device has the advantages of simple structure, safety, reliability, high efficiency and the like, however, in the running process of the carbon dioxide energy storage device, the devices such as a pipeline, a liquid storage tank and the like of the carbon dioxide energy storage device are easy to be corroded by working media, and serious threat is caused to the running of the device.
In order to solve the above-mentioned problems, the present application provides a carbon dioxide energy storage device, and referring to fig. 1 and 2, a description will be given of the carbon dioxide energy storage device according to an embodiment of the present application. The carbon dioxide energy storage device comprises a gas storage 100, an energy storage component 200, a purifying component 300, a liquid storage tank 400 and an energy release component 500 which are sequentially connected, wherein the energy storage component 200 is used for compressing and then cooling a first mixed fluid which flows out of the gas storage 100 and comprises gaseous carbon dioxide and gaseous water to obtain a second mixed fluid, the second mixed fluid comprises the gaseous carbon dioxide, the purifying component 300 is used for separating liquid water from the second mixed fluid, cooling and liquefying the gaseous carbon dioxide in the second mixed fluid into liquid carbon dioxide, storing the liquid carbon dioxide in the liquid storage tank 400, and the energy release component 500 is used for enabling the liquid carbon dioxide flowing out of the liquid storage tank 400 to absorb heat and heat into the gaseous carbon dioxide, and storing the gaseous carbon dioxide in the gas storage 100 after expansion work.
It should be noted that, under normal working conditions, the gas storage 100 is used for storing gaseous carbon dioxide, but because the energy storage device may have insufficient gas displacement and local leakage in the energy storage device during the installation, testing and operation processes, and impurities such as moisture and air may be mixed in the circulating working medium of the energy storage device, the first mixed fluid flowing out of the gas storage 100 may include impurities such as water and air in addition to carbon dioxide as a circulating medium.
Specifically, the energy storage assembly 200 may include a compressor 210 and an energy storage heat exchanger 220, the compressor 210 may be driven by a motor to compress the first mixed fluid, raise the pressure and temperature of the first mixed fluid, and the energy storage heat exchanger 220 is used to cool the first mixed fluid after the pressure and temperature are raised, thereby enabling the consumed electric energy to be partially converted into compression energy and internal energy. It should be noted that, the second mixed fluid obtained after the compression and cooling of the energy storage assembly 200 includes gaseous carbon dioxide, and according to the difference of the cooling capacity provided by the energy storage heat exchanger 220, the second mixed fluid may be near the pure gas phase, that is, most of the water and most of the carbon dioxide in the second mixed fluid are gaseous, and the second mixed fluid may be in two phases of gas and liquid, for example, most of the carbon dioxide in the second mixed fluid remains in the gas phase, while some of the water in the second mixed fluid is gaseous and other water is in the liquid state.
Specifically, depending on the state of the water in the second mixed fluid, the purifier assembly 300 may separate liquid water from the second mixed fluid in a number of different ways. For example, when the second mixed fluid includes at least a portion of liquid water, the purification assembly 300 may separate most of the liquid water and the gaseous carbon dioxide from each other by a gas-liquid separation method, so as to obtain dehydrated gaseous carbon dioxide, and then cool and liquefy the gaseous carbon dioxide into liquid carbon dioxide, and store the liquid carbon dioxide in the liquid storage tank 400. Regardless of the state of the water in the second mixed fluid, the purifier assembly 300 may separate liquid water from the second mixed fluid by liquid-liquid separation. The purification assembly 300 may cool the second mixed fluid to completely liquefy most of the carbon dioxide and most of the water in the second mixed fluid, and separate the liquid carbon dioxide from the liquid water by the liquid-liquid separation device to obtain dehydrated liquid carbon dioxide. The specific structure of purification assembly 300 is not limited solely by this embodiment.
Specifically, referring to fig. 7, the energy release assembly 500 may include an energy release heat exchanger 510 and an expander 520, where the energy release heat exchanger 510 can convert liquid carbon dioxide in the liquid storage tank 400 into gaseous carbon dioxide and input the gaseous carbon dioxide into the expander 520, the gaseous carbon dioxide can drive the expander 520 to do work and drive the generator to generate electricity, so as to convert the compression energy into electric energy, and the gaseous carbon dioxide after doing work can be returned to the gas storage 100 for recycling.
In the technical scheme of the embodiment of the application, the purification assembly 300 is arranged between the energy storage assembly 200 and the liquid storage tank 400, and because the carbon dioxide energy storage device is used for compressing and cooling the first mixed fluid in the gas storage 100 into the liquid fluid by the energy storage assembly 200 and then storing the liquid fluid in the liquid storage tank 400, the effect of converting electric energy into internal energy and compression energy for storage is achieved, after the purification assembly 300 is arranged between the energy storage assembly 200 and the liquid storage tank 400, the purification assembly 300 can directly separate liquid water by the compression energy and the cold energy which are required to be consumed in the energy storage process, thereby achieving the effect of improving the purity of carbon dioxide in the carbon dioxide energy storage device, avoiding corrosion of devices such as pipelines of the energy storage device, the liquid storage tank 400 and the like as much as possible, and improving the operation safety of the carbon dioxide energy storage device.
In addition, in the technical scheme of the embodiment of the application, the purification assembly 300 directly separates the liquid water by the compression energy and the cold energy which are required to be consumed in the energy storage process, so that the energy which is additionally required to be consumed in the dehydration operation can be reduced.
In addition, compared with the mode of purging the inside of the energy storage device for multiple times or replacing the gas in the energy storage device for multiple times before the operation of the carbon dioxide energy storage device, the carbon dioxide energy storage device provided by the embodiment of the application has the advantages that the purification assembly 300 is directly arranged between the energy storage assembly 200 and the liquid storage tank 400, the on-line dehydration can be realized in the operation process of the device, the shutdown of the energy storage device can be avoided, the construction period of the device is shortened, and the operation efficiency and the economic benefit are improved.
Referring to fig. 3, in some embodiments, the purifying assembly 300 includes a housing 310 and a cooling tube 330, the housing 310 has a receiving cavity 311, a mixed fluid inlet 312, a first outlet 313 and a second outlet 314 respectively communicated with the receiving cavity 311, the cooling tube 330 is used for circulating a first cold fluid to cool and liquefy gaseous carbon dioxide and gaseous water in the second mixed fluid, the mixed fluid inlet 312 is disposed at a higher level than the first outlet 313 and the second outlet 314, the first outlet 313 is used for flowing liquid water out of the receiving cavity 311, and the second outlet 314 is used for flowing liquid carbon dioxide out of the receiving cavity 311.
It should be noted that, in the normal operation state of the carbon dioxide energy storage device, the second mixed fluid approaches to the pure gas phase or is in the gas-liquid mixed phase, and when the second mixed fluid enters the accommodating cavity 311 from the mixed fluid inlet 312, the second mixed fluid contacts the outer wall of the cooling tube 330 and condenses on the outer wall of the cooling tube 330 to form droplets, and the droplets formed on the outer wall of the cooling tube 330 flow to the bottom of the accommodating cavity 311 under the action of gravity. Since the density of the liquid carbon dioxide in the housing 310 is generally smaller than that of the liquid water under the normal operation of the carbon dioxide storage device, when the liquid drops formed on the outer wall of the cooling tube 330 are collected at the bottom of the accommodating cavity 311, the liquid water will be settled to the bottom of the housing 310, and the liquid carbon dioxide will be above the liquid water. In addition, in the above process, one of the flow rate, the temperature and the composition of the first cold fluid may be adjusted, or the flow rate of the second mixed fluid may be adjusted, so that the first outlet 313 and the second outlet 314 are always closed by the liquid water or the liquid carbon dioxide, and the gas-phase substances in the second mixed fluid may be prevented from overflowing from the first outlet 313 and the second outlet 314 to the outside of the accommodating cavity 311.
After the liquid droplets formed on the outer wall of the cooling tube 330 are collected at the bottom of the receiving chamber 311, the liquid carbon dioxide and the liquid water may be separated in various ways.
In one implementation, the first outlet 313 may be disposed at a lower height than the second outlet 314, so that when most of the supersaturated water vapor and the supersaturated carbon dioxide in the second mixed fluid are condensed into mist droplets or larger droplets on the outer wall of the cooling pipe 330 and settle into the accommodating chamber 311, the liquid water and the liquid carbon dioxide may be layered under the action of gravity, and as described above, the liquid water and the liquid carbon dioxide settle into the accommodating chamber 311 after the carbon dioxide liquid is disposed at a lower pressure and a higher temperature than the carbon dioxide liquid, the liquid water may be settled into the bottom of the accommodating chamber 311, and the liquid carbon dioxide may be dispersed into the upper portion of the liquid water, so that the liquid water may flow out of the accommodating chamber 311 from the first outlet 313 disposed at a lower height, and the liquid carbon dioxide may be discharged from the accommodating chamber 311 from the second outlet 314 at a higher height.
In another implementation, the purifying assembly 300 further includes a partition 320, where the partition 320 is disposed at the bottom of the accommodating cavity 311 and divides the bottom of the accommodating cavity 311 into a first groove 3111 and a second groove 3112, where the first groove 3111 and the second groove 3112 are disposed sequentially in a horizontal direction, the first groove 3111 is in communication with the second outlet 314, the second groove 3112 is in communication with the first outlet 313, and the cooling tube 330 is disposed above the first groove 3111.
Specifically, the partition 320 serves to divide the bottom of the receiving cavity 311 into the first and second grooves 3111 and 3112, the tops of the first and second grooves 3111 and 3112 are each open to form an opening, the first and second grooves 3111 and 3112 are disposed in sequence in the horizontal direction, and it can be understood that the openings of the first and second grooves 3111 and 3112 are disposed in sequence in the horizontal direction.
The partition 320 may be fixed, i.e. the partition 320 is fixed on the wall of the accommodating cavity 311, or adjustable, i.e. the height of the partition 320 in the accommodating cavity 311 is adjustable, so that the height of the partition 320 is adjustable, thereby being convenient for controlling the liquid-liquid interface of carbon dioxide-water under different treatment capacity, different residence time and different physical parameters, and effectively separating liquid carbon dioxide from water.
With the above embodiment, during the operation of the carbon dioxide energy storage device, most of the supersaturated vapor and the supersaturated carbon dioxide in the second mixed fluid are condensed into mist droplets or larger droplets on the outer wall of the cooling pipe 330 and settle in the second tank 3112, and since the density of the carbon dioxide liquid is smaller than that of water at the pressure and temperature at which the carbon dioxide energy storage device is normally operated, after the liquid water and the liquid carbon dioxide settle in the second tank 3112, the liquid water settles at the bottom of the second tank 3112, the liquid carbon dioxide is dispersed in the upper part of the liquid water, and by setting the height of the partition 320, the liquid carbon dioxide can flow into the first tank 3111 over the partition 320, and the separation of the carbon dioxide from the water can be achieved.
In the technical scheme of the embodiment of the application, the purification assembly 300 liquefies the gaseous carbon dioxide and the gaseous water in the first mixed fluid directly by the compression energy and the cold energy which are required to be consumed in the energy storage process, and enables the liquefied liquid carbon dioxide and the liquefied liquid water to be naturally separated under the action of gravity, so that a condensing device or a mechanical energy consumption device is not required to be additionally added in the whole dehydration operation, the extra consumed energy in the dehydration operation is low, the technical effect that most of water in the device can be removed with lower energy consumption can be achieved, and the energy consumption is saved.
Referring to fig. 5, in some embodiments, the purifying assembly 300 further includes a controller 391, and a first pressure sensor 392, a second pressure sensor 393, a temperature sensor 394 and a liquid level sensor 395 electrically connected to the controller 391, respectively, wherein the first pressure sensor 392 is used for measuring the gas phase pressure in the accommodating cavity 311, the temperature sensor 394 is used for measuring the temperature in the accommodating cavity 311, the liquid level sensor 395 is used for measuring the liquid level in the accommodating cavity 311, the second pressure sensor 393 is used for measuring the pressure to which the bottom wall of the accommodating cavity 311 is subjected when the setting height of the first outlet 313 is lower than the setting height of the second outlet 314, and the second pressure sensor 393 is used for measuring the pressure to which the bottom wall of the first groove 3111 is subjected when the purifying assembly 300 further includes the partition 320.
Referring to fig. 12, an embodiment of the present application further provides a control method of a carbon dioxide energy storage device, where the control method of the carbon dioxide energy storage device is used for controlling the carbon dioxide energy storage device, and the control method of the carbon dioxide energy storage device includes:
s1, acquiring the gas phase temperature in the accommodating cavity 311 Pressure of gas phaseLiquid levelAnd the liquid phase pressure of the bottom of the liquid water below the liquid carbon dioxide in the accommodating cavity 311。
Specifically, the gas phase temperature may be measured by the temperature sensor 394Acquisition of gas phase pressure by first pressure sensor 392Liquid phase pressure is obtained by the second pressure sensor 393Liquid level obtained by measurement of liquid level sensor 395。
S2, adjusting the first cold fluid and at least one of temperature, flow rate and composition components to enable the gas phase temperature to be the same as that of the first cold fluidAnd a preset gas phase temperatureDeviation of less than a preset temperature differenceAnd subjecting the gas phase to pressureAnd preset gas phase pressureIs less than the first preset pressure difference。
S3, when the liquid phase pressure isAnd (3) withIs greater than a second predetermined pressure differenceAt this time, the first outlet 313 is controlled to be opened and liquid water is discharged until the liquid phase pressure valueAnd (3) withThe difference value is smaller than or equal to the second preset pressure difference valueWherein, the method comprises the steps of, wherein,(Greater than 0) is a preset liquid water level value,Is the gas phase pressure valueAnd gas phase temperature valueThe density of the liquid carbon dioxide under it,Is the gas phase pressure valueAnd gas phase temperature valueThe density of the liquid water at normal temperature and normal pressure.
It will be appreciated that within the gas phase space, the gas phase pressureThe temperature changes along with the operation of the compression condensation working condition of the carbon dioxide energy storage device, and according to the physical characteristics of carbon oxide, the density of liquid carbon dioxide formed by condensing gaseous carbon dioxide under different pressures is different, so that the gas phase pressure intensity is obtainedThe first pressure sensor 392 of (1) is connected to the controller 391, the controller 391 can inquire the liquid carbon dioxide expansion fold line table, and can obtain different gas phase pressures of the carbon dioxide energy storage device under the compression condensation working conditionDensity of liquid carbon dioxide at bottom of lower housing 310。
It will also be appreciated that when the liquid column height of the liquid water within the housing 310 isThe liquid column height of the liquid carbon dioxide isThe theoretical pressure value at the bottom of the liquid water below the liquid carbon dioxide should be equal toThe theoretical pressure value is compared with the measured liquid phase pressureComparing, if the measured liquid phase pressureAbove this theoretical pressure, this indicates that the height of liquid water within housing 310 is greater thanIt is necessary to drain a portion of the liquid water so that the liquid column height of the liquid water in the housing 310 is less than or equal toThe shell 310 can hold a very small amount of liquid water, so that the purity of the circulating working medium is improved.
In the technical scheme of the embodiment of the application, the starting and closing of the first outlet 313 are controlled, and the automatic discharging and blocking of the liquid water at the bottom of the shell 310 are controlled, so that the carbon dioxide concentration quality of the carbon dioxide energy storage device can be effectively improved, the control quality of the energy storage device is improved, and the safe operation of the energy storage device is ensured.
Referring to fig. 3 and 4, in some embodiments, the housing 310 is provided with a cold fluid outlet 316 and a cold fluid inlet 317 disposed up and down, two ends of the cooling tube 330 are respectively communicated with the cold fluid outlet 316 and the cold fluid inlet 317, the purifying assembly 300 further includes a baffle 340, the baffle 340 is disposed on a wall of the accommodating cavity 311, and the baffle 340 is disposed at a height higher than the cold fluid inlet 317 and lower than the mixed fluid inlet 312, and at least a portion of the baffle 340 is inclined upwards from the outside to the inside of the accommodating cavity 311.
It will be appreciated that when the cooling tube 330 is not installed, the cold fluid outlet 316 and the cold fluid inlet 317 are both in communication with the receiving chamber 311, and after one end of the cooling tube 330 is in communication with the cold fluid inlet 317 and the other end of the cooling tube 330 is in communication with the cold fluid outlet 316, the first cold fluid will flow from bottom to top within the cooling tube 330.
In the technical solution of the embodiment of the present application, the baffle 340 may guide the second mixed fluid upward, so that the second mixed fluid flows from top to bottom in the accommodating cavity 311, which may improve the uniformity of the second mixed fluid distribution in the accommodating cavity 311, and may further make the flow direction of the second mixed fluid opposite to the flow direction of the first cold fluid in the cooling tube 330, thereby improving the heat exchange efficiency of the first cold fluid and the second mixed fluid.
For example, referring to fig. 3 and 4, the baffle 340 includes a first baffle segment 341 and a second baffle segment 342, one end of the first baffle segment 341 is fixed on the cavity wall of the accommodating cavity 311, the first baffle segment 341 is disposed parallel to the penetrating direction of the mixed fluid inlet 312, the second baffle 340 is connected to the other end of the first baffle segment 341, and the second baffle segment 342 is disposed gradually and upwardly inclined from the inner side of the accommodating cavity 311 to the outer side of the accommodating cavity 311. So configured, the first guiding segment 341 helps to guide the second mixed fluid into the accommodating cavity 311 smoothly, reduce vortex and turbulence of the fluid, and improve the flow efficiency of the fluid. The second guiding section 342 can guide the second mixed fluid upwards, so that the second mixed fluid flows from top to bottom in the accommodating cavity 311, which can improve the uniformity of the distribution of the second mixed fluid in the accommodating cavity 311, and make the flow direction of the second mixed fluid opposite to the flow direction of the first cold fluid in the cooling tube 330, thereby improving the heat exchange efficiency of the first cold fluid and the second mixed fluid.
Referring to fig. 3 and 4, in some embodiments, the first mixed fluid further includes gas impurities, and the top of the housing 310 is further provided with a first gas impurity outlet 315, and the first gas impurity outlet 315 is in communication with the accommodating cavity 311.
The gas impurity refers to a gas which is not easily liquefied into a liquid state under each working condition of the carbon dioxide energy storage device, and may be N 2、O2、SOx or the like.
Specifically, a gas container may be connected to the first gas impurity outlet 315, and the gas impurities may be collected in the gas container and then periodically discharged.
Because when the gas impurities exist in the carbon dioxide energy storage device, the volume available for storing carbon dioxide in the device can be reduced, the energy storage efficiency is reduced, and the gas impurities can have negative effects on the aspects of the heat exchange efficiency, the working pressure and the like of the device, in the technical scheme of the embodiment of the application, the first gas impurity outlet 315 is arranged at the top of the shell 310, after the gas impurities are accumulated at the top of the shell 310, the gas impurities in the shell 310 can be discharged in a regular discharging mode, or the gas impurities in the shell 310 can be discharged after the pressure at the top of the shell 310 reaches a certain value, so that the purity of the carbon dioxide in the device is improved, and the energy storage efficiency and the safety of the operation of the device are further improved.
Referring to fig. 3 and 4, in some embodiments, the purifying assembly 300 further includes a separating element 350, where the separating element 350 is disposed in the accommodating cavity 311 and is located between the mixed fluid inlet 312 and the first gas impurity outlet 315, for capturing water droplets or carbon dioxide droplets.
In particular, the separation element 350 may take a variety of forms, and the separation element 350 may be configured as a wire mesh type separation element, such as a wire mesh mist eliminator, which primarily removes liquid droplets from a gas by means of impact separation. The separation element 350 may also be configured as a grille-type mist catcher, where the grille-type mist catcher captures droplets by using expansion and centrifugal force, gas carrying droplets passes through the catcher, and is forced to flow along a flow channel in the catcher, and since the density of droplets is high and the inertial force is high, the droplets cannot completely change direction along with the airflow, so that some droplets collide and then adhere to the baffle, and the droplets adhering to the baffle flow down from the baffle under the action of gravity, thereby realizing gas-liquid two-phase separation. Of course, the separating element 350 may also be provided in the form of a swash plate or a diffuser assembly, etc., and the specific structure of the separating element 350 is not limited only in this embodiment.
In the technical solution of the embodiment of the present application, by disposing the separation element 350 between the mixed fluid inlet 312 and the first gas impurity outlet 315, the probability that carbon dioxide droplets escape from the gas impurity outlet to the outside of the accommodating cavity 311 can be reduced, and the loss of the circulating working medium can be avoided as much as possible.
Referring to fig. 6 to 8, in some embodiments, the purification assembly 300 includes a first separator 360 and a cooler 370, the energy storage assembly 200, the first separator 360, the cooler 370, and the liquid tank 400 are sequentially connected, the first separator 360 is used to separate liquid water from the second mixed fluid to obtain a third mixed fluid, and the cooler 370 is used to liquefy the third mixed fluid to obtain a fourth mixed fluid.
In the case where all of the water in the second mixed fluid is liquid water, the first separator 360 may remove substantially all of the water in the liquid carbon dioxide, and in this case, the third mixed fluid obtained by the first separator 360 includes only gaseous carbon dioxide. When part of the water in the second mixed fluid is liquid water and part of the water is gaseous water, the gaseous carbon dioxide removed by the first separator 360 also contains part of the gaseous water, that is, in this case, the third mixed fluid obtained by the first separator 360 includes the gaseous carbon dioxide and part of the gaseous water, and further dehydration treatment can be performed on the third mixed fluid.
Specifically, in some implementations, the first separator 360 may be provided as a gravity separator that does not consume additional energy, e.g., the first separator 360 may be provided as a liquid collection bag integrated on a pipe section between the energy storage assembly 200 and the cooler 370.
In other implementations, the first separator 360 may be configured as a centrifugal separator that consumes energy, although other forms of gas-liquid separators may be employed for the first separator 360, and the present embodiment is not limited in this regard.
In other implementations, referring to fig. 9, the first separator 360 includes a dehydration column 361 and a gas impurity separator 362, the energy storage assembly 200, the dehydration column 361, the gas impurity separator 362 and the cooler 370 are sequentially connected, the dehydration column 361 is used for separating moisture from the second mixed fluid, the gas impurity separator 362 is used for separating gas impurities from the fluid flowing out of the dehydration column 361, the number of the dehydration columns 361 may be two, the two dehydration columns 361 are connected in parallel between the energy storage assembly 200 and the gas impurity separator 362, the two dehydration columns 361 may be alternately used, and after water in one of the dehydration columns 361 is saturated, the dehydration column 361 may be regenerated, cold purged and pressurized, so that the dehydration column 361 may again absorb moisture.
The regeneration process comprises the following steps of firstly reversing the adsorption direction to reduce the pressure of the dehydration tower 361, then heating the dry regeneration gas by a heater and then entering the dehydration tower 361, fully heating the solid adsorbent in the dehydration tower 361, reducing the adsorption quantity of the adsorbent in the processes of increasing the temperature and reducing the pressure of the adsorbent, and separating impurities such as water originally adsorbed from the adsorbent to realize regeneration. The regenerated gas is wrapped with the desorbed water and is discharged from the dehydrating tower 361, and can enter a cooling device for cooling, the cooled wet regenerated gas can realize the separation of liquid water and gaseous regenerated gas through a separator, and the regenerated gas is discharged through the separator.
The cold purging and pressure increasing process includes the steps of cold purging the dewatering tower 361 without heating dry regenerated gas, cooling the purged gas at the outlet of the dewatering tower 361 through a cooling device, separating the cooled purged gas by a separator, and discharging the cooled purged gas, and increasing the pressure of the dehydrated regenerated gas in the dewatering tower 361 until the adsorbed pressure is reached.
In the technical scheme of the embodiment of the application, because the compression work and the cold energy consumed when liquefying the gaseous water in the first mixed fluid belong to the compression energy and the cold energy originally consumed in the energy storage process, the compression work and the cold energy are not required to be additionally consumed when liquefying the gaseous water in the technical scheme of the embodiment of the application, so that the whole dehydration process does not need to consume the energy additionally when the first separator 360 does not consume the energy additionally, and the energy consumed in the dehydration process is only the energy consumed by the first separator 360 when the first separator 360 needs to consume the energy, and the energy consumption is lower.
Referring to fig. 6, in some embodiments, the first mixed fluid further includes gas impurities, the cooler 370 has a shell side 371 and a tube side 372, the shell side 371 and the tube side 372 are respectively used for flowing the third mixed fluid and the second cold fluid, a second gas impurity outlet 373 is arranged at the top of the cooler 370, and the second gas impurity outlet 373 is mutually communicated with the shell side 371 for flowing the gas impurities in the third mixed fluid out of the shell side 371.
In the technical solution of this embodiment, the gas impurity refers to a gas that is not easy to liquefy into a liquid state under each working condition of the carbon dioxide energy storage device, and may be N 2、O2、SOx or the like.
Specifically, a gas container may be connected to the second gas impurity outlet 373, and the gas impurities may be collected in the gas container and then periodically discharged.
In the technical scheme of the embodiment of the application, the second gas impurity outlet 373 which is mutually communicated with the shell side 371 is arranged, after gas impurities are accumulated at the top of the shell side 371, the gas impurities in the shell side 371 can be discharged in a periodical discharge mode, so that the purity of carbon dioxide in the device is improved, and the energy storage efficiency and the operation safety are further improved.
Referring to fig. 7, in some embodiments, the purification assembly 300 further includes a second separator 380, the second separator 380 being disposed on the inlet side of the reservoir 400 for separating liquid water from fluid flowing into the reservoir 400.
In some implementations, referring to fig. 7, the second separator 380 is disposed between the cooler 370 and the reservoir 400, and in other implementations, referring to fig. 1 and 2, the second separator 380 may be disposed between the purification assembly 300 and the reservoir 400, although the second separator 380 is not shown in fig. 1 and 2.
Specifically, in some implementations, the second separator 380 may be configured as a centrifugal separator that consumes energy, for example, the second separator 380 may be configured as a butterfly centrifuge, a disc of the butterfly centrifuge is provided with a fluid inlet, the fourth mixed fluid flows to a disc gap through the fluid inlet, liquid water in the fourth mixed fluid flows along a disc inclined plane falling film under the centrifugal force and moves towards an inner wall of the drum, the dead weight liquid outlet continuously discharges, the liquid carbon dioxide moves upwards along the disc inclined plane, and the liquid carbon dioxide is discharged through a light liquid outlet after converging.
In other implementations, the second separator 380 may be configured as a gravity separator that does not consume additional energy, for example, the second separator 380 may also be configured as a liquid collection container that is positioned between the cooler 370 and the liquid storage tank 400 and that is integrated with a liquid collection bag, the second separator 380 may be configured as a liquid collection bag that is integrated on a pipe section between the cooler 370 and the liquid storage tank 400, and of course, the second separator 380 may also be configured as another type of liquid-liquid separator, which is not limited solely in this embodiment.
In the technical scheme of the embodiment of the application, the second separator 380 is arranged between the cooler 370 and the liquid storage tank 400, so that liquid water can be separated from the fourth mixed fluid, the water content in the energy storage device is further reduced, and the energy storage efficiency and the operation safety are improved.
Referring to fig. 7, in some embodiments, the carbon dioxide energy storage device further includes a third separator 600, the third separator 600 being disposed between the liquid storage tank 400 and the energy release assembly 500, the third separator 600 being configured to separate liquid water from the liquid fluid flowing from the liquid storage tank 400 to the energy release assembly 500.
Specifically, in some implementations, the third separator 600 may be configured as a gravity separator that does not consume additional energy, e.g., the third separator 600 may be configured as a liquid collection container integrated with a liquid collection bag that is in communication with the liquid storage tank 400 and the energy release assembly 500, respectively, the liquid collection bag being capable of collecting and draining liquid water, and, for example, the third separator 600 may also be configured as a liquid collection bag integrated on a pipe section between the liquid storage tank 400 and the energy release assembly 500.
In other implementations, the third separator 600 may be configured as a centrifugal separator that consumes energy, such as a butterfly centrifuge, although the third separator 600 may also employ other forms of liquid-liquid separators, and the present embodiment is not limited in this regard.
In the technical solution of the embodiment of the present application, by disposing the third separator 600 between the energy release assembly 500 and the liquid storage tank 400, liquid water in the liquid fluid flowing from the liquid storage tank 400 to the energy release assembly 500 can be removed, so that the water content in the energy storage device is further reduced, and the energy storage efficiency and the operation safety are improved.
Referring to fig. 2 and 8, in some embodiments, the carbon dioxide energy storage device further includes a transfer pump 700 and a fourth separator 800, where the transfer pump 700, the fourth separator 800 and the liquid storage tank 400 are sequentially connected in a closed loop, and the transfer pump 700 is used to pump the liquid fluid in the liquid storage tank 400 to the fourth separator 800 to remove the liquid water and then pump the liquid fluid back to the liquid storage tank 400.
Specifically, in some implementations, the fourth separator 800 may be configured as a gravity separator that does not consume additional energy, e.g., the fourth separator 800 may be configured as a liquid collection container integrated with a liquid collection bag that is in communication with the liquid storage tank 400 and the transfer pump 700, respectively, the liquid collection bag being capable of collecting and draining liquid water, and, for example, the fourth separator 800 may be configured as a liquid collection bag integrated on a pipe section between the liquid storage tank 400 and the transfer pump 700.
In other implementations, the fourth separator 800 may also be configured as a centrifugal separator that consumes energy, such as a butterfly centrifuge, although the fourth separator 800 may also employ other forms of liquid-liquid separators, and the present embodiment is not limited in this regard.
Because liquid water may exist in the liquid fluid stored in the liquid storage tank 400, in the technical scheme of the embodiment of the application, the liquid fluid in the liquid storage tank 400 is dehydrated by using the conveying pump 700 and the fourth separator 800, the structure is simple, the operation of the device is not affected, secondary dehydration can be realized together with the purification assembly 300, the water content of carbon dioxide is further reduced, and the energy storage efficiency of the device and the operation safety of the device are improved.
Referring to fig. 10, an embodiment of the present application provides a carbon dioxide energy storage method, which is implemented by the carbon dioxide energy storage device, and includes:
and S10a, pressurizing and cooling the first mixed fluid comprising the gaseous carbon dioxide and the gaseous water to obtain a second mixed fluid.
And S20a, cooling and liquefying the gaseous water in the second mixed fluid into liquid water, and cooling and liquefying the gaseous carbon dioxide in the second mixed fluid into liquid carbon dioxide.
And S30a, separating the liquid carbon dioxide and the liquid water obtained in the step S20a by a liquid-liquid separation mode.
It should be noted that the second mixed fluid obtained in step S10a may be a gas phase, that is, the second mixed fluid only includes gaseous carbon dioxide and gaseous water, and the second mixed fluid obtained in step S10a may be a gas-liquid two phase, that is, the second mixed fluid includes gaseous carbon dioxide, gaseous water and liquid water.
Specifically, in step S30a, a centrifugal separator that consumes mechanical energy may be used to separate the liquid carbon dioxide and the liquid water, or a gravity separator that does not require additional energy consumption may be used to separate the liquid carbon dioxide and the liquid water, or of course, the liquid carbon dioxide and the liquid water may be separated in other manners, which is not limited in this embodiment.
According to the technical scheme, liquid water is separated from liquid carbon dioxide in a liquid-liquid separation mode directly in the energy storage process of the energy storage device, so that the purity of the carbon dioxide in the carbon dioxide energy storage device is improved, the inside of the device is not required to be purged for many times or the gas in the device is not required to be replaced for many times before the device is operated, dehydration can be realized in the operation process of the device, the construction period of the device is shortened, and the operation efficiency and economic benefit are improved.
In addition, in the technical scheme of the embodiment of the application, the step S10a and the step S20a can directly liquefy the gaseous water and the gaseous carbon dioxide by the compression energy and the cooling energy which are required to be consumed in the energy storage process, the additional consumption of energy is not needed, the technical effect of removing the water in the device without the additional consumption of energy can be achieved when the energy is not consumed in the liquid-liquid separation process of the step S30a, and the energy consumed in the whole dehydration process is only the energy consumed in the step S30a when the energy is consumed in the liquid-liquid separation process of the step S30a, so that the energy consumption is low.
Referring to fig. 11, an embodiment of the present application provides a carbon dioxide energy storage method, which is implemented by the carbon dioxide energy storage device, and includes:
s10b, pressurizing and cooling the first mixed fluid comprising the gaseous carbon dioxide and the gaseous water, so that the gaseous water in the first mixed fluid is at least partially condensed into liquid water, and the gaseous carbon dioxide in the first mixed fluid is kept in a gaseous state to obtain a second mixed fluid;
And S20b, separating liquid water from the second mixed fluid by a gas-liquid separation mode to obtain a third mixed fluid.
And S30b, cooling and liquefying the gaseous carbon dioxide in the third mixed fluid into liquid carbon dioxide to obtain a fourth mixed fluid.
Specifically, in step S20b, a centrifugal separator that consumes mechanical energy may be used to separate the liquid water from the second mixed fluid, or a gravity separator that does not require additional energy consumption may be used to separate the liquid water from the second mixed fluid, or of course, the liquid water may be separated from the second mixed fluid in other manners, which is not limited in this embodiment.
According to the technical scheme, liquid water is separated from liquid carbon dioxide in a gas-liquid separation mode directly in the process of energy storage of the energy storage device, so that the purity of the carbon dioxide in the carbon dioxide energy storage device is improved, the inside of the device is not required to be purged for many times or the gas in the device is not required to be replaced for many times before the device is operated, dehydration can be realized in the process of operation of the device, the construction period of the device is shortened, and the operation efficiency and economic benefit are improved.
In addition, since the compression work and the cold energy consumed when the gaseous water in the first mixed fluid is liquefied in the step S10b belong to the compression energy and the cold energy which are originally consumed in the energy storage process, the compression work and the cold energy are not required to be consumed in the step S10b additionally, so that the whole dehydration process is not required to consume additional energy when the gas-liquid separation process in the step S20b is also not required to consume additional energy, and the energy consumed in the dehydration process is only the energy consumed in the gas-liquid separation process in the step S20b and is lower.
Referring to fig. 11, in some embodiments, after step S30b of the carbon dioxide energy storage method further includes:
and S40b, separating liquid water from the fourth mixed fluid by a liquid-liquid separation mode.
Specifically, in step S40b, a centrifugal separator that consumes mechanical energy may be used to separate the liquid water from the fourth mixed fluid, or a gravity separator that does not require additional energy consumption may be used to separate the liquid water from the fourth mixed fluid, which is not limited only in this embodiment.
According to the technical scheme, liquid water is separated from the fourth mixed fluid in a liquid-liquid separation mode, so that the water content in the energy storage device is reduced further, and the energy storage efficiency and the operation safety are improved.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (12)
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| CN116592681A (en) * | 2023-04-18 | 2023-08-15 | 北京博睿鼎能动力科技有限公司 | Carbon dioxide replenishment and energy storage systems for carbon dioxide flooding oilfields |
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| CN104567273A (en) * | 2014-11-27 | 2015-04-29 | 惠州凯美特气体有限公司 | Expansion and liquefaction method for gas carbon dioxide |
| CN114166292A (en) * | 2020-09-11 | 2022-03-11 | 武汉诺赛尔科技有限公司 | Integrated multi-medium mixed fluid measuring device and measuring method |
| CN217855408U (en) * | 2022-08-19 | 2022-11-22 | 国鸿液化气机械工程（大连）有限公司 | Ship CO 2 Dehydration drying device |
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| CN116592681A (en) * | 2023-04-18 | 2023-08-15 | 北京博睿鼎能动力科技有限公司 | Carbon dioxide replenishment and energy storage systems for carbon dioxide flooding oilfields |
| CN116697769A (en) * | 2023-07-19 | 2023-09-05 | 百穰新能源科技(深圳)有限公司 | Gas-liquid two-phase carbon dioxide energy storage system and method for improving purity of working medium |
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