CN113236389B - Compressed carbon dioxide energy storage system and energy storage method - Google Patents
Compressed carbon dioxide energy storage system and energy storage method Download PDFInfo
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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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
- 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
- F04B39/10—Adaptations or arrangements of distribution members
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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
- 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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to the technical field of energy storage, in particular to a compressed carbon dioxide energy storage system and an energy storage method. The energy storage system comprises a high-pressure gas storage module, a low-pressure gas storage module, a compressor and a turbine; the high-pressure gas storage module comprises a plurality of high-pressure gas storage tanks; the low-pressure gas storage module comprises a plurality of low-pressure gas storage tanks; the gas pressure in each high-pressure gas storage tank is all different and is uniformly divided into the pressure range; the gas pressure in each low-pressure gas storage tank is different and is uniformly distributed in the pressure range. The carbon dioxide storage tank is divided into the high-pressure gas storage module and the low-pressure gas storage module, and the high-pressure gas storage tank and the low-pressure gas storage tank with appropriate pressures are respectively selected from the high-pressure gas storage module and the low-pressure gas storage module according to real-time pressure ratio requirements, so that the power requirements of a compressor or a turbine are met, and the adjusting capacity of the compressed carbon dioxide energy storage system is improved.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a compressed carbon dioxide energy storage system and an energy storage method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Renewable energy sources such as photovoltaic energy, wind power and the like are intermittent, so that great impact is brought to a large power grid when the renewable energy sources surf the internet, and in order to enable the renewable energy sources to surf the internet stably, an energy storage system is needed to assist the renewable energy sources to surf the internet. The energy storage systems developed at present mainly include pumped storage, compressed gas energy storage systems, electrochemical energy storage systems and the like, wherein the compressed gas energy storage systems have the advantages of short construction period, large storage capacity and the like and are developed rapidly. The compressed carbon dioxide energy storage system in the compressed gas energy storage system provides a new way for capturing, storing and utilizing carbon dioxide, and the system is easy to liquefy, so that the system volume which can be smaller is widely concerned in recent years.
However, the inventor finds that due to the existence of the low-pressure gas storage tank in the compressed carbon dioxide energy storage system, the operation of a compressor or a turbine is influenced due to the change of the pressure ratio between the high-pressure storage tank and the low-pressure storage tank in the energy storage and release processes, so that the adjustment capacity of the energy storage system is reduced.
Disclosure of Invention
In the prior art, a compressed carbon dioxide energy storage system generally comprises a low-pressure gas storage tank, a high-pressure gas storage tank, a compressor, a turbine and a generator; in the energy storage stage, the compressor compresses the low-pressure carbon dioxide stored in the low-pressure tank to a high-pressure state, and then stores the carbon dioxide in the high-pressure gas storage tank; in the energy release stage, the carbon dioxide stored in the high-pressure tank is released and then enters the turbine to work, the turbine drives the generator to generate electricity, and the expanded low-pressure carbon dioxide is stored in the low-pressure tank gas storage tank. In the energy storage process of the compressed carbon dioxide energy storage system, the pressure of carbon dioxide in the low-pressure gas storage tank is continuously reduced, the pressure of carbon dioxide in the high-pressure gas storage tank is continuously increased, and the pressure ratio of the compressor is continuously increased, so that the power required by the compressor is continuously increased, if the power provided by renewable energy sources or a power grid cannot meet the power required by the compressor, the compressor stops working, the energy storage system cannot provide the capacity of consuming redundant electric energy, and the regulation capacity is lost; in the energy releasing process of the compressed carbon dioxide energy storage system, the pressure of carbon dioxide in a high-pressure gas storage tank is continuously reduced, the pressure of carbon dioxide in a low-pressure gas storage tank is continuously increased, and the expansion ratio of a turbine is continuously reduced, so that the work doing capability of the turbine is reduced, if the power grid or the required electric quantity of a user is very high at the moment, and the generated energy of a generator is reduced due to the reduction of the expansion ratio of the turbine and the required electric quantity of the user cannot be met, the energy storage system loses the adjusting capability.
The invention provides a compressed carbon dioxide energy storage system and an energy storage method, aiming at the technical problem that the regulating capacity of the compressed carbon dioxide energy storage system is reduced in the prior art.
In order to achieve the above object, the technical solution of the present invention is as follows:
in a first aspect of the invention, a compressed carbon dioxide energy storage system is provided, comprising a high pressure gas storage module, a low pressure gas storage module, a compressor and a turbine;
the high-pressure gas storage module comprises a plurality of high-pressure gas storage tanks; the low-pressure gas storage module comprises a plurality of low-pressure gas storage tanks;
the gas pressure in each high-pressure gas storage tank is all different and is uniformly divided into the pressure range; the gas pressure in each low-pressure gas storage tank is different and is uniformly distributed in the pressure range.
In the invention, according to the function that the power of the compressor or the turbine is the pressure ratio, in the actual operation process, a proper high-pressure air storage tank and a proper low-pressure air storage tank can be selected from the low-pressure air storage module and the high-pressure air storage module according to the power of the compressor or the turbine, so that the pressure ratio of the high-pressure air storage tank to the low-pressure air storage tank meets the power requirement, and the adjustment effect of the energy storage system is achieved.
In a second aspect of the invention, there is provided a compressed carbon dioxide energy storage method, which is performed by means of the compressed carbon dioxide energy storage system of the first aspect, and comprises the following steps:
during the energy storage process, valves at two sides of the turbine are in a closed state, a low-pressure gas storage tank and a high-pressure gas storage tank with proper pressure are respectively selected from the low-pressure gas storage module and the high-pressure gas storage module according to the energy storage time and the energy storage power, corresponding valves are opened according to the real-time power of the compressor along with the compression process, the low-pressure gas storage tank and the high-pressure gas storage tank with proper pressure are selected in real time, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are closed, simultaneously, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are opened, the energy storage work is continuously completed, and the action is continuously performed until the energy storage process is finished;
in the energy release process, valves on two sides of the compressor are in a closed state, according to the power required by the power grid at the moment, a proper low-pressure gas storage tank and a proper high-pressure gas storage tank are selected in the low-pressure gas storage module and the high-pressure gas storage module, corresponding valves are opened, carbon dioxide stored in the high-pressure gas storage tank expands in the turbine to work, and the finished carbon dioxide is stored in the corresponding low-pressure gas storage tank; with the progress of the energy release process, according to the power of the turbine and the power required by the power grid, selecting a proper low-pressure gas storage tank and a proper high-pressure gas storage tank in real time, closing the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, opening the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, continuing to finish the energy release work, and performing the operation until the energy release stage is stopped.
The specific embodiment of the invention has the following beneficial effects:
the carbon dioxide storage tank is divided into the high-pressure gas storage module and the low-pressure gas storage module, and the high-pressure gas storage tank and the low-pressure gas storage tank with appropriate pressures are respectively selected from the high-pressure gas storage module and the low-pressure gas storage module according to real-time pressure ratio requirements, so that the power requirements of a compressor or a turbine are met, and the adjusting capacity of the compressed carbon dioxide energy storage system is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a compressed carbon dioxide energy storage system;
in the figure, the device comprises a compressor 1, a compressor 2, valves I and 3, valves II and 4, valves III and 5, valves IV and 6, a turbine 7, a carbon dioxide pipeline 8, a low-pressure gas storage tank 9, a photovoltaic panel 10, a photovoltaic panel bracket 11 and a high-pressure gas storage tank.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In one embodiment of the invention, a compressed carbon dioxide energy storage system is provided, comprising a high pressure gas storage module, a low pressure gas storage module, a compressor and a turbine;
the high-pressure gas storage module comprises a plurality of high-pressure gas storage tanks; the low-pressure gas storage module comprises a plurality of low-pressure gas storage tanks;
the gas pressure in each high-pressure gas storage tank is all different and is uniformly divided into the pressure range; the gas pressure in each low-pressure gas storage tank is different and is uniformly distributed in the pressure range.
Furthermore, the maximum pressure of the low-pressure gas storage module is smaller than the minimum pressure of the high-pressure gas storage module;
in one or more embodiments, the number of high pressure gas storage tanks is at least three; the number of the low-pressure gas storage tanks is at least three;
in one or more embodiments, the compressor has at least three stages, each stage of compressor is connected through a carbon dioxide pipeline, namely the outlet of each stage of compressor is the inlet of the next stage of compressor;
in one or more embodiments, the turbine has at least three stages, each stage of the turbine is connected by a carbon dioxide pipeline, that is, the outlet of each stage of the turbine is the inlet of the next stage of the turbine;
in one or more embodiments, the inlet side and the outlet side of all the low-pressure air storage tanks are respectively connected with a main air pipeline, each low-pressure air storage tank is connected with a gas distribution pipeline, and the air inlet and the air storage of each low-pressure air storage tank are respectively controlled by corresponding valves; meanwhile, the inlet side and the outlet side of all the high-pressure gas storage tanks are respectively connected with a main gas pipeline, each high-pressure gas storage tank is connected with a gas distribution pipeline, and the gas inlet and the gas storage of each high-pressure gas storage tank are respectively controlled by corresponding valves; therefore, the operation of the compressor or the turbine is realized, and the corresponding pressure ratio requirement can be realized only by changing the inlet valves or the outlet valves of different low-pressure gas storage tanks and high-pressure gas storage tanks.
In one or more embodiments, a photovoltaic panel is arranged on the top of the low-pressure gas storage tank and the high-pressure gas storage tank, and further, the photovoltaic panel is fixed on the low-pressure gas storage tank and the high-pressure gas storage tank through a photovoltaic panel bracket; the problem that the space is idle under the photovoltaic board can be solved.
In one embodiment of the present invention, a compressed carbon dioxide energy storage method is provided, where the method is performed by using the compressed carbon dioxide energy storage system, and includes the following steps:
during the energy storage process, valves at two sides of the turbine are in a closed state, a low-pressure gas storage tank and a high-pressure gas storage tank with proper pressure are respectively selected from the low-pressure gas storage module and the high-pressure gas storage module according to the energy storage time and the energy storage power, corresponding valves are opened according to the real-time power of the compressor along with the compression process, the low-pressure gas storage tank and the high-pressure gas storage tank with proper pressure are selected in real time, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are closed, simultaneously, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are opened, the energy storage work is continuously completed, and the action is continuously performed until the energy storage process is finished;
in the energy release process, valves on two sides of the compressor are in a closed state, according to the power required by the power grid at the moment, a proper low-pressure gas storage tank and a proper high-pressure gas storage tank are selected in the low-pressure gas storage module and the high-pressure gas storage module, corresponding valves are opened, carbon dioxide stored in the high-pressure gas storage tank expands in the turbine to work, and the finished carbon dioxide is stored in the corresponding low-pressure gas storage tank; with the progress of the energy release process, according to the power of the turbine and the power required by the power grid, selecting a proper low-pressure gas storage tank and a proper high-pressure gas storage tank in real time, closing the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, opening the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, continuing to finish the energy release work, and performing the operation until the energy release stage is stopped.
In the compressed carbon dioxide energy storage method, the energy storage and release processes are completed by adjusting the pressure ratio of the low-pressure gas storage tank and the high-pressure gas storage tank in real time; because the power of the compressor or the turbine is gradually increased along with the increase of the flow under a certain pressure ratio, the energy storage and release work can be smoothly completed by adjusting the flow of the carbon dioxide in the energy storage and release processes.
The invention will be further explained and illustrated with reference to the following examples.
Example 1
As shown in fig. 1, a compressed carbon dioxide energy storage system includes a high pressure gas storage module, a low pressure gas storage module, a compressor 1 and a turbine 6; wherein the high-pressure gas storage module comprises 3 high-pressure gas storage tanks 11; the low-pressure gas storage module comprises 3 low-pressure gas storage tanks 8; the gas pressures in the 3 high-pressure gas storage tanks are all different and are uniformly divided into pressure ranges; the gas pressures in the 3 low-pressure gas storage tanks are all different and are uniformly distributed in the pressure range, and the maximum gas pressure in the low-pressure gas storage tank is smaller than the minimum gas pressure in the high-pressure gas storage tank;
the compressor 1 is provided with three stages of compressors, each stage of compressor is connected through a carbon dioxide pipeline, and the outlet of each stage of compressor is the inlet of the next stage of compressor; the turbine 6 has three stages, each stage of turbine is connected through a carbon dioxide pipeline, and the outlet of each stage of turbine is the inlet of the next stage of turbine.
All the low-pressure gas storage tanks 8 are respectively connected with a main gas pipeline at the inlet side and the outlet side, each low-pressure gas storage tank is connected with a gas distribution pipeline, the gas inlet and the gas storage of each low-pressure gas storage tank are respectively controlled by corresponding valves, simultaneously, all the high-pressure gas storage tanks 11 are respectively connected with a main gas pipeline at the inlet side and the outlet side, each high-pressure gas storage tank is connected with a gas distribution pipeline, and the gas inlet and the gas storage of each high-pressure gas storage tank are respectively controlled by corresponding valves; therefore, the operation of the compressor or the turbine is realized, and the corresponding pressure ratio requirement can be realized only by changing the inlet valves or the outlet valves of the different low-pressure air storage tanks 8 and the high-pressure air storage tanks 11.
The top of low pressure gas holder 8 and high pressure gas holder 11 sets up photovoltaic board 9, photovoltaic board 9 passes through photovoltaic board support 10 to be fixed on low pressure gas holder and high pressure gas holder.
Example 2
When the electricity consumption is in the valley or the power generation amount of the renewable energy is larger than the power amount of the on-grid electricity, the redundant power generation amount drives the compressor, and the compressor compresses the carbon dioxide stored in the low-pressure gas storage tank to a high-pressure state and stores the carbon dioxide in the high-pressure gas storage tank. Because the power supplied to the compressor is net load power which is a fixed value, proper high-low pressure gas storage tanks are selected from the low-pressure gas storage module and the high-pressure gas storage module according to the relation between power and pressure ratio for gas release and heavy gas.
In the whole energy storage process, the valve II 3 and the valve IV 5 are in a completely closed state, a low-pressure gas storage tank and a high-pressure gas storage tank with proper pressures are respectively selected from the low-pressure gas storage module and the high-pressure gas storage module according to energy storage time and energy storage power, the corresponding valve I2 and the corresponding valve III 4 are opened, and at the moment, the compressor 1 starts to work, and carbon dioxide stored in the low-pressure gas storage tank is compressed into the high-pressure gas storage tank. Along with the compression process, the gas pressure in the low-pressure gas storage tank will be reduced, the gas pressure in the high-pressure gas storage tank will be increased, and the power supplied by the power grid is insufficient at the moment, so that the compressor 1 compresses the carbon dioxide in the low-pressure gas storage tank 8 into the high-pressure gas storage tank 11 for storage; at this time, according to the real-time power of the compressor 1, the low-pressure gas storage tank 8 and the high-pressure gas storage tank 11 with appropriate pressures are reselected from the low-pressure gas storage module and the high-pressure gas storage module, and while the valves i 2 and iii 4 corresponding to the low-pressure gas storage tank 8 and the high-pressure gas storage tank 11 at the previous stage are closed, the valves i 2 and iii 4 corresponding to the low-pressure gas storage tank 8 and the high-pressure gas storage tank 11 at this stage are opened, so that the energy storage work is continuously completed. This action continues during the energy storage phase until the energy storage process is complete. And after the energy storage process is finished, closing the valves I2 and III 4 corresponding to the low-pressure air storage tank 8 and the high-pressure air storage tank 11, and thus finishing the energy storage process.
At the peak time of electricity utilization or when the power generated by the renewable energy source is smaller than the electricity quantity on the grid, the lacking electricity quantity is supplied by the turbine 6, the high-pressure carbon dioxide stored in the high-pressure gas storage tank 8 expands in the turbine 6 to work, and the finished carbon dioxide is stored in the low-pressure gas storage tank. In order to realize the stability of the power grid, the power supplied to the power grid by the turbine is real-time net power of the power grid, and is a fixed value, and proper low-pressure gas storage tanks and high-pressure gas storage tanks are required to be selected from the low-pressure gas storage modules and the high-pressure gas storage modules according to the relation between power and pressure ratio for energy release.
In the energy releasing process, the valve I2 and the valve III 4 are in a normally closed state, according to the power required by the power grid at the moment, a proper low-pressure gas storage tank 8 and a proper high-pressure gas storage tank 11 are selected in the low-pressure gas storage module and the high-pressure gas storage module, the corresponding valve II 3 and the corresponding valve IV 5 are opened, carbon dioxide stored in the high-pressure gas storage tank 11 expands in the turbine to work, and the finished carbon dioxide is stored in the corresponding low-pressure gas storage tank along the opened valve II 3. As the energy release process progresses, the gas pressure in the high pressure gas tank 11 will drop and the gas pressure in the low pressure gas tank 8 will rise, so that the expansion ratio of the turbine 6 will drop, so that the power of the turbine 6 will also drop, and if the power required by the power grid is greater than the power of the turbine at this time, non-smooth operation of the large power grid will result. At this time, the low pressure air storage tank 8 and the high pressure air storage tank 11 are selected from the low pressure air storage module and the high pressure air storage module again, so that the ratio of the pressure ratio of the two air storage tanks reaches the pressure ratio required by the turbine 6 at this time. After selecting a new low-pressure air storage tank 8 and a new high-pressure air storage tank 11, closing a valve II 3 and a valve IV 5 corresponding to the low-pressure air storage tank 8 and the high-pressure air storage tank 11 in the previous stage, and simultaneously opening a valve II 3 and a valve IV 5 corresponding to the low-pressure air storage tank 8 and the high-pressure air storage tank 11 in the previous stage. In the energy release stage, according to the power of the turbine and the equal power required by the power grid, a proper low-pressure air storage tank 8 and a proper high-pressure air storage tank 11 are selected in real time, and the operations are carried out until the energy release stage stops. And when the energy release process is stopped, closing the valve II 3 and the valve IV 5 corresponding to the low-pressure air storage tank 8 and the high-pressure air storage tank 11, and ending the energy release process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A compressed carbon dioxide energy storage system is characterized by comprising a high-pressure gas storage module, a low-pressure gas storage module, a compressor and a turbine;
the high-pressure gas storage module comprises a plurality of high-pressure gas storage tanks; the low-pressure gas storage module comprises a plurality of low-pressure gas storage tanks;
the gas pressure in each high-pressure gas storage tank is all different and is uniformly divided into the pressure range; the gas pressure in each low-pressure gas storage tank is all different and is uniformly distributed in the pressure range;
the high-pressure gas storage module and the low-pressure gas storage module respectively select a high-pressure gas storage tank and a low-pressure gas storage tank with proper pressure according to the real-time pressure ratio requirement so as to meet the power requirement of a compressor or a turbine;
the outlet of the compressor is connected with the inlet of the high-pressure gas storage module, the outlet of the high-pressure gas storage module is connected with the inlet of the turbine, the outlet of the turbine is connected with the inlet of the low-pressure gas storage module, and the outlet of the low-pressure gas storage module is connected with the inlet of the compressor to form a complete working loop;
the maximum pressure of the low-pressure gas storage module is smaller than the minimum pressure of the high-pressure gas storage module;
the number of the high-pressure gas storage tanks is at least three; the number of the low-pressure gas storage tanks is at least three;
the compressor is provided with at least three stages of compressors, each stage of compressor is connected through a carbon dioxide pipeline, and the outlet of each stage of compressor is the inlet of the next stage of compressor;
the turbine has at least three stages, each stage of turbine is connected through a carbon dioxide pipeline, and the outlet of each stage of turbine is the inlet of the next stage of turbine;
all the low-pressure gas storage tanks are respectively connected with a main gas pipeline at the inlet side and the outlet side, each low-pressure gas storage tank is connected with a gas distribution pipeline, and the gas inlet and the gas storage of each low-pressure gas storage tank are respectively controlled by corresponding valves.
2. The compressed carbon dioxide energy storage system of claim 1, wherein the inlet side and the outlet side of all the high pressure gas storage tanks are respectively connected with a main gas pipeline, each high pressure gas storage tank is connected with a gas distribution pipeline, and the gas inlet and the gas storage of each high pressure gas storage tank are respectively controlled by corresponding valves.
3. The compressed carbon dioxide energy storage system of claim 1, wherein photovoltaic panels are arranged on the top of the low pressure gas storage tank and the high pressure gas storage tank, and the photovoltaic panels are fixed on the low pressure gas storage tank and the high pressure gas storage tank through photovoltaic panel supports.
4. The compressed carbon dioxide energy storage system of claim 3, wherein the photovoltaic panels are secured to the low pressure and high pressure gas storage tanks by photovoltaic panel brackets.
5. A compressed carbon dioxide energy storage method, which is implemented by the compressed carbon dioxide energy storage system of any one of claims 1 to 4, and comprises the following steps:
during the energy storage process, valves at two sides of the turbine are in a closed state, a low-pressure gas storage tank and a high-pressure gas storage tank with proper pressure are respectively selected from the low-pressure gas storage module and the high-pressure gas storage module according to the energy storage time and the energy storage power, corresponding valves are opened according to the real-time power of the compressor along with the compression process, the low-pressure gas storage tank and the high-pressure gas storage tank with proper pressure are selected in real time, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are closed, simultaneously, the valves corresponding to the low-pressure gas storage tank and the high-pressure gas storage tank at the previous stage are opened, the energy storage work is continuously completed, and the action is continuously performed until the energy storage process is finished;
in the energy release process, valves on two sides of the compressor are in a closed state, according to the power required by the power grid at the moment, a proper low-pressure gas storage tank and a proper high-pressure gas storage tank are selected in the low-pressure gas storage module and the high-pressure gas storage module, corresponding valves are opened, carbon dioxide stored in the high-pressure gas storage tank expands in the turbine to work, and the finished carbon dioxide is stored in the corresponding low-pressure gas storage tank; with the progress of the energy release process, according to the power of the turbine and the power required by the power grid, selecting a proper low-pressure gas storage tank and a proper high-pressure gas storage tank in real time, closing the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, opening the corresponding valves of the low-pressure gas storage tank and the high-pressure gas storage tank in the previous stage, continuing to finish the energy release work, and performing the operation until the energy release stage is stopped.
Priority Applications (1)
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