CN116317176B - Novel composite energy storage system - Google Patents
Novel composite energy storage system Download PDFInfo
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- CN116317176B CN116317176B CN202310153297.4A CN202310153297A CN116317176B CN 116317176 B CN116317176 B CN 116317176B CN 202310153297 A CN202310153297 A CN 202310153297A CN 116317176 B CN116317176 B CN 116317176B
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- energy storage
- carbon dioxide
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- 238000004146 energy storage Methods 0.000 title claims abstract description 101
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 148
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 74
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 74
- 238000010248 power generation Methods 0.000 claims abstract description 36
- 238000007906 compression Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a novel composite energy storage system, which relates to the field of energy storage, and comprises: the device comprises a gas storage bin, a compression unit, an energy storage unit and an expansion power generation unit; the energy storage unit includes: the heavy object is arranged in the air storage tank, is in sealing fit with the inner wall of the air storage tank and slides relative to the inner wall of the air storage tank; the side wall of the air storage tank is provided with an air inlet and an air outlet, and the air inlet and the air outlet of the air storage tank are positioned below the weight blocks; the gas storage bin is connected with the compression unit; the compression unit is connected with an air inlet of the air storage tank; the air outlet of the air storage tank is connected with the expansion power generation unit; the expansion power generation unit is connected with the gas storage bin. The invention can realize constant power energy storage and energy release, increase the energy storage capacity of compressed carbon dioxide, avoid energy loss caused by the throttling effect of the expansion valve and improve the system efficiency.
Description
Technical Field
The invention relates to the field of energy storage, in particular to a novel composite energy storage system.
Background
The vast application of renewable energy power generation is considered to be one of the effective ways to solve the problems of carbon dioxide emissions and energy. However, the intermittent performance and uncertainty of the renewable energy power generation can cause impact on the stability of the power grid when the renewable energy power generation is connected, so that the safety of the power grid is affected, and therefore the energy storage system is required to be used for stable output of the renewable energy power generation.
The compressed carbon dioxide energy storage system consists of an air storage tank, a compressor, an expander, a heat exchanger and an expansion valve. When the renewable energy power generation output is high, the compressor consumes the surplus electric quantity, and carbon dioxide is compressed from a low pressure to a high pressure state and stored in the high pressure tank. When the output of the renewable energy generating capacity is low, carbon dioxide stored in the high-pressure tank is sent into the expander to do work, so that the lacking electric quantity output is compensated. The stable output of renewable energy power generation can be realized through the alternate work of the energy storage and energy release processes of the compressed carbon dioxide energy storage system.
The prior compressed carbon dioxide energy storage system adopts a fixed-volume gas storage tank to store gas, and the technology has the following problems:
1. the adoption of the fixed-volume air storage tank can cause continuous change of the pressure of the compressor and the pressure of the expander in the energy storage and energy release process, so that the energy storage system cannot realize constant-power energy storage and energy release when no control system is involved.
2. The adoption of the fixed-volume gas storage tank can cause more gas to remain in the gas storage tank after the end of energy storage or energy release, so that the capacity of the compressed carbon dioxide energy storage system is limited.
3. When a fixed-volume gas storage tank is adopted, a compressed carbon dioxide energy storage system is generally developed based on an expansion valve, and when the expansion valve converts carbon dioxide gas released by the gas storage tank into low-pressure carbon dioxide, the self throttling effect of the expansion valve can cause certain energy loss, so that the system efficiency is low.
Disclosure of Invention
The invention aims to provide a novel composite energy storage system which can realize constant-power energy storage and energy release, increases the energy storage capacity of compressed carbon dioxide, avoids energy loss caused by the throttling effect of an expansion valve, and improves the system efficiency.
In order to achieve the above object, the present invention provides the following solutions:
A novel composite energy storage system, the system comprising:
the device comprises a gas storage bin, a compression unit, an energy storage unit and an expansion power generation unit;
The energy storage unit includes: the weight block is arranged in the air storage tank, is in sealing fit with the inner wall of the air storage tank and slides relative to the inner wall of the air storage tank; the side wall of the air storage tank is provided with an air inlet and an air outlet, and the air inlet of the air storage tank and the air outlet of the air storage tank are both positioned below the weight;
The gas storage bin is connected with the compression unit, and is used for storing carbon dioxide gas, and the volume of the gas storage bin changes along with the change of the internal carbon dioxide gas, so that the pressure of the carbon dioxide gas in the gas storage bin is maintained at a first pressure;
The compression unit is connected with the air inlet of the air storage tank and is used for compressing the carbon dioxide gas released by the air storage bin into the air storage tank to obtain compressed carbon dioxide gas;
The gas outlet of the gas storage tank is connected with the expansion power generation unit, the gas storage tank is used for storing carbon dioxide gas, the weight is used for keeping the pressure of the carbon dioxide in the gas storage tank at a second pressure, and the second pressure is larger than the first pressure;
the expansion power generation unit is connected with the gas storage bin, and is used for carrying out expansion power generation on carbon dioxide gas released by the gas storage bin to obtain expanded carbon dioxide gas, and inputting the expanded carbon dioxide gas into the gas storage bin.
Optionally, the gas storage bin is of a pressure-bearing film structure.
Optionally, the compression unit includes: a compressor;
The air inlet of the compressor is connected with the air outlet of the air storage bin, the air outlet of the compressor is connected with the air inlet of the air storage bin, and the compressor is used for compressing carbon dioxide gas into the air storage bin.
Optionally, the compression unit further includes: an intercooler;
the intercooler is arranged between the air storage tank and the compressor, and is used for cooling carbon dioxide gas released by the air storage tank.
Optionally, the compression unit further includes: a first valve and a second valve;
The first valve is arranged between the gas storage bin and the compressor;
the second valve is arranged between the intercooler and the air storage tank.
Optionally, the energy storage system further includes a gravity energy storage unit, and the gravity energy storage unit specifically includes: the device comprises an energy storage tower, a mechanical arm, a traction rope, a pulley and a first motor;
The mechanical arm is arranged on the energy storage tower, and the energy storage tower is used for supporting the mechanical arm;
the pulley is arranged at one end of the mechanical arm;
the traction rope is wound on the pulley, one end of the traction rope is connected with the weight, and the other end of the traction rope is wound on the rotating shaft of the first motor;
the first motor is used for driving the weight to move upwards at a constant speed through the traction rope when the carbon dioxide gas is introduced into the gas storage tank, and generating electricity under the traction of the weight through the traction rope when the carbon dioxide gas is output from the gas storage tank.
Optionally, the expansion power generation unit includes: an expander and a second motor;
The air inlet of the expansion machine is connected with the air outlet of the air storage tank, the air outlet of the expansion machine is connected with the air inlet of the air storage bin, the rotating shaft of the second motor is connected with the rotating shaft of the expansion machine, the expansion machine is used for expanding carbon dioxide gas released by the air storage tank to do work, driving the second motor to rotate to generate electricity, and inputting the expanded carbon dioxide gas into the air storage bin.
Optionally, the expansion power generation unit further includes: a heater;
the heater is arranged between the gas storage tank and the expansion machine, and is used for heating carbon dioxide gas released by the gas storage tank.
Optionally, the expansion power generation unit further includes: a third valve and a fourth valve;
The third valve is arranged between the air storage tank and the heater;
the fourth valve is arranged between the expansion machine and the gas storage bin.
Optionally, the air storage tank further includes: a blocking device;
the blocking device is arranged at the top end of the air storage tank and used for limiting the maximum height of the weight block lifted upwards.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The invention provides a novel composite energy storage system, wherein the pressure of a compressor and an expander in the energy storage and energy release process can be constant through the variable-volume gas storage bin and the variable-volume gas storage bin, so that the energy storage system can realize constant-power energy storage and energy release, the capacity of the energy storage system is increased, the energy loss caused by the throttling effect of an expansion valve is avoided, and the system efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, 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 block diagram of a composite energy storage system provided by an embodiment of the present invention;
Fig. 2 is a schematic diagram of a gravity energy storage unit according to an embodiment of the present invention.
Symbol description:
the device comprises a gas storage bin-1, a compression unit-2, a compressor-21, an intercooler-22, a first valve-23, a second valve-24, an energy storage unit-3, a weight block-31, a gas storage tank-32, a blocking device-33, a gravity energy storage unit-4, an energy storage tower-41, a mechanical arm-42, a traction rope-43, a pulley-44, a first motor-45, an electric slider-46, an expansion power generation unit-5, an expander-51, a second motor-52, a heater-53, a third valve-54 and a fourth valve-55.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a novel composite energy storage system, which can constantly store and release energy by adopting the pressure of a compressor and an expander in the energy storage and release process of a pressure-bearing film structure, so that the energy storage system can realize constant-power energy storage and energy release; the variable volume gas storage tank with weight adjustment greatly reduces the residual gas in the gas storage tank after the end of energy storage or energy release, increases the capacity of the compressed carbon dioxide energy storage system, and simultaneously omits an expansion valve because the variable volume gas storage tank is adopted, thereby avoiding energy loss caused by the throttling action of the expansion valve and improving the system efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, a novel composite energy storage system of the present invention includes:
The device comprises a gas storage bin 1, a compression unit 2, an energy storage unit 3 and an expansion power generation unit 5.
The gas storage bin 1 is connected with the compression unit 2, the gas storage bin 1 is used for storing carbon dioxide gas, the volume of the gas storage bin 1 changes along with the change of the internal carbon dioxide gas, and the pressure of the carbon dioxide gas in the gas storage bin 1 is maintained at the first pressure. The gas storage bin 1 is of a pressure-bearing film structure.
The compression unit 2 is connected with an air inlet of the air storage tank 32, and the compression unit 2 is used for compressing the carbon dioxide gas released by the air storage tank 1 into the air storage tank 32 to obtain compressed carbon dioxide gas.
Further, the compression unit 2 includes: a compressor 21, an intercooler 22, a first valve 23 and a second valve 24.
The air inlet of the compressor 21 is connected with the air outlet of the air storage bin 1, the air outlet of the compressor 21 is connected with the air inlet of the air storage tank 32, and the compressor 21 is used for compressing carbon dioxide gas into the air storage tank 32.
The intercooler 22 is disposed between the air tank 32 and the compressor 21, and the intercooler 22 is used for cooling the carbon dioxide gas released from the air tank 32.
The first valve 23 is disposed between the gas storage bin 1 and the compressor 21.
The second valve 24 is disposed between the intercooler 22 and the air tank 32.
During the energy storage process, the first valve 23 and the second valve 24 are opened first, and the third valve 54 and the fourth valve 55 are in a closed state, so that communication among various components during the energy storage process is maintained. The renewable energy source then generates electric energy to supply power to the compressor 21, and the compressor 21 compresses the carbon dioxide gas stored in the gas storage bin 1 into a high pressure state and inputs the compressed carbon dioxide gas into the gas storage tank 32.
Further, the intercooler 22 is used for reducing the temperature of the compressed carbon dioxide, and the heat exchanged in the process can be used for heating the carbon dioxide in the expansion power generation unit 5, and also can be used for other heat exchange processes, and the heat exchange medium can be used for heating in the energy release process after being stored, and can also be used as a heat source of other thermal cycles.
The energy storage unit 3 includes: the weight 31 and the air storage tank 32, the weight 31 is arranged in the air storage tank 32, the weight 31 is in sealing fit with the inner wall of the air storage tank 32, and the weight slides relative to the inner wall of the air storage tank 32; the side wall of the air storage tank 32 is provided with an air inlet and an air outlet, and the air inlet of the air storage tank 32 and the air outlet of the air storage tank 32 are both positioned below the weight 31.
The gas outlet of the gas storage tank 32 is connected with the expansion power generation unit 5, the gas storage tank 32 is used for storing carbon dioxide gas, the weight 31 is used for keeping the pressure of the carbon dioxide in the gas storage tank 32 at a second pressure, and the second pressure is larger than the first pressure, and the gas storage tank 32 further comprises: a blocking device 33; a blocking device 33 is provided at the top end of the air tank 32, and the blocking device 33 is used for limiting the maximum height of the upward lifting of the weight 31.
Further, the energy storage system further includes a gravity energy storage unit 4, and the gravity energy storage unit 4 specifically includes: the energy storage tower 41, the mechanical arm 42, the traction rope 43, the pulley 44 and the first motor 45.
The mechanical arm 42 is disposed on the energy storage tower 41, and the energy storage tower 41 is used for supporting the mechanical arm 42.
A pulley 44 is provided at one end of the robot arm 42.
As shown in fig. 2, when the gravity energy storage unit 4 uses the existing gravity energy storage device, an electric slider 46 may be further disposed between one end of the mechanical arm 42 and the pulley 44. For example, the motorized slider 46 may be stationary.
The traction rope 43 is wound around the pulley 44, one end of the traction rope 43 is connected to the weight 31, and the other end of the traction rope 43 is wound around the rotation shaft of the first motor 45.
The first motor 45 is used for driving the weight 31 to move upwards at a constant speed through the traction rope 43 when the carbon dioxide gas is introduced into the gas storage tank 32, and generating electricity under the traction of the weight 31 through the traction rope 43 when the carbon dioxide gas is output from the gas storage tank 32. Illustratively, the first electric machine 45 is disposed within the energy storage tower 41.
During the energy storage process, the gas pressure in the gas storage tank 32 increases gradually as the carbon dioxide gas is charged. In order to maintain constant gas pressure in the gas storage tank 32, the gravity energy storage unit 4 lifts the weight 31 upwards through the traction rope 43 at a constant speed, increases the occupied volume of gas in the gas storage tank 32, and ensures constant gas pressure in the gas storage tank 32, so that constant compressor 21 power is realized, and the first motor 45 drives the traction rope 43 to lift the weight 31 upwards, so that the energy storage capacity of the energy storage system is further increased.
Meanwhile, if the power of the compressor 21 is to be changed in the compression process, the volume occupied by the gas in the gas storage tank 32 can be changed by changing the lifting speed of the weight 31, so that the pressure of the gas in the gas storage tank 32 is changed, the flow rate in the compression process is further changed, and finally the control of the power of the compressor 21 is realized. When the weight 31 reaches the blocking device 33, the weight 31 cannot be lifted upwards, and the process of compressing the carbon dioxide energy storage system is ended, at which time the first valve 23 and the second valve 24 are closed.
The expansion power generation unit 5 is connected with the gas storage bin 1, and the expansion power generation unit 5 is used for performing expansion power generation on the carbon dioxide gas released by the gas storage tank 32 to obtain expanded carbon dioxide gas, and inputting the expanded carbon dioxide gas into the gas storage bin 1.
Further, the expansion power generation unit 5 includes: an expander 51, a second motor 52, a heater 53, a third valve 54 and a fourth valve 55.
The air inlet of the expander 51 is connected with the air outlet of the air storage tank 32, the air outlet of the expander 51 is connected with the air inlet of the air storage tank 1, the rotating shaft of the second motor 52 is connected with the rotating shaft of the expander 51, the expander 51 is used for expanding and acting on carbon dioxide gas released by the air storage tank 32, driving the second motor 52 to rotate for generating electricity, and the expanded carbon dioxide gas is input into the air storage tank 1.
A heater 53 is provided between the gas tank 32 and the expander 51, and the heater 53 is used to heat the carbon dioxide gas released from the gas tank 32.
The third valve 54 is disposed between the air tank 32 and the heater 53.
A fourth valve 55 is provided between the expander 51 and the gas storage bin 1.
In the expansion power generation process, the electric energy used by the compression unit 2 is supplemented through the power generation output of the expansion power generation unit 5, in the expansion power generation process, the third valve 54 and the fourth valve 55 are firstly opened, the first valve 23 and the second valve 24 are in a closed state, the carbon dioxide gas released by the gas storage tank 32 enters the expansion machine 51 to expand and do work, and the expansion machine 51 drives the second motor 52 to rotate and generate power.
Further, in order to ensure that the carbon dioxide gas does not undergo a phase change in the expander 51 and to improve the work efficiency of the expander 51, a heater 53 installed between the storage tank and the expander 51 is used to raise the temperature of the carbon dioxide gas discharged into the gas storage tank 32, and the expanded carbon dioxide gas is stored in the gas storage bin 1. Since the continuous deflation will cause the pressure of the gas in the gas storage tank 32 to decrease, the mechanical arm 42 in the gravity energy storage unit 4 releases the weight 31 at a certain speed through the traction rope 43 to reduce the volume occupied by the gas in the gas storage tank 32, thereby ensuring the constant pressure of the gas in the gas storage tank 32. At the same time, the weight 31 descends at a constant speed to drive the first motor 45 in the gravity energy storage unit 4 to generate electricity.
The gas storage bin 1 is continuously inflated, so that the volume of the gas storage bin 1 is continuously increased, the pressure of the gas storage bin is kept constant, and meanwhile, the gas in the gas storage tank 32 can be emptied as much as possible due to the continuous descending of the weight 31, so that the energy release capacity of the whole energy storage system is further improved. The constant power of the expander 51 can be achieved by the constant pressure of the gas in the gas storage tank 32 and the gas storage tank 1. In the operation process, if the output power of the expander 51 is to be changed, the volume occupied by the gas in the gas storage tank 32 can be changed by changing the descending speed of the weight 31, so that the gas pressure in the gas storage tank 32 is changed, the expansion power generation power is further changed, and finally the control of the power of the expander 51 is realized.
Example 2
When the energy storage unit 3 and the gravity energy storage unit 4 stop working and the electricity generated by the renewable energy source still needs to continue to store energy, the gravity energy storage unit 4 can be additionally provided with a plurality of mechanical arms 42, traction ropes 43, pulleys 44, a first motor 45, an electric sliding block 46 and a weight 31, when the energy storage needs to continue, the first motor 45 rotates to lift the height of the weight 31, converts the electric energy into gravitational potential energy, and moves the weight 31 to the periphery of the energy storage tower 41 through the electric sliding block 46 and places the weight at a certain height; when releasing energy, the mechanical arm 42 puts down the weight 31 again, and in the process, the first motor generates electricity to convert gravitational potential energy into electric energy. The added gravity energy storage unit 4 and the weight 31 are redundant designs of the system, and the energy release capacity of the energy storage system can be increased through mutual cooperation.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.
Claims (8)
1. A novel composite energy storage system, the system comprising:
the device comprises a gas storage bin, a compression unit, an energy storage unit and an expansion power generation unit;
The energy storage unit includes: the weight block is arranged in the air storage tank, is in sealing fit with the inner wall of the air storage tank and slides relative to the inner wall of the air storage tank; the side wall of the air storage tank is provided with an air inlet and an air outlet, and the air inlet of the air storage tank and the air outlet of the air storage tank are both positioned below the weight;
The gas storage bin is connected with the compression unit, and is used for storing carbon dioxide gas, and the volume of the gas storage bin changes along with the change of the internal carbon dioxide gas, so that the pressure of the carbon dioxide gas in the gas storage bin is maintained at a first pressure;
The compression unit is connected with the air inlet of the air storage tank and is used for compressing the carbon dioxide gas released by the air storage bin into the air storage tank to obtain compressed carbon dioxide gas; the compression unit includes: a compressor; the air inlet of the compressor is connected with the air outlet of the air storage bin, the air outlet of the compressor is connected with the air inlet of the air storage bin, and the compressor is used for compressing carbon dioxide gas into the air storage bin;
The gas outlet of the gas storage tank is connected with the expansion power generation unit, the gas storage tank is used for storing carbon dioxide gas, the weight is used for keeping the pressure of the carbon dioxide in the gas storage tank at a second pressure, and the second pressure is larger than the first pressure;
the expansion power generation unit is connected with the gas storage bin, and is used for carrying out expansion power generation on the carbon dioxide gas released by the gas storage bin to obtain expanded carbon dioxide gas, and inputting the expanded carbon dioxide gas into the gas storage bin;
The energy storage system also comprises a gravity energy storage unit, and the gravity energy storage unit specifically comprises: the device comprises an energy storage tower, a mechanical arm, a traction rope, a pulley and a first motor; the mechanical arm is arranged on the energy storage tower, and the energy storage tower is used for supporting the mechanical arm; the pulley is arranged at one end of the mechanical arm; the traction rope is wound on the pulley, one end of the traction rope is connected with the weight, and the other end of the traction rope is wound on the rotating shaft of the first motor; the first motor is used for driving the weight to move upwards at a constant speed through the traction rope when the carbon dioxide gas is introduced into the gas storage tank, and generating electricity under the traction of the weight through the traction rope when the carbon dioxide gas is output from the gas storage tank; in order to keep constant gas pressure in the gas storage tank, the gravity energy storage unit lifts the weight upwards through the traction rope at a constant speed, increases the occupied volume of gas in the gas storage tank, ensures constant gas pressure in the gas storage tank, and accordingly realizes constant compressor power to control the first motor to drive the traction rope to lift the weight upwards, and further increases the energy storage capacity of the energy storage system;
A plurality of mechanical arms, traction ropes, pulleys, motors, electric sliding blocks and weight blocks are added on the gravity energy storage unit; the electric sliding block is arranged between one end of the added mechanical arm and the added pulley; when the energy storage unit and the gravity energy storage unit stop working and the electricity generated by renewable energy sources still needs to continue to store energy, the electric sliding block moves the weight blocks around the energy storage tower and is placed at a certain height; when releasing energy, the mechanical arm puts down the weight, and the motor generates electricity to convert gravitational potential energy into electric energy.
2. The novel composite energy storage system of claim 1, wherein the gas storage bin is of a pressure-bearing film structure.
3. The novel composite energy storage system of claim 1, wherein the compression unit further comprises: an intercooler;
the intercooler is arranged between the air storage tank and the compressor and is used for cooling carbon dioxide gas compressed by the compressor.
4. A novel composite energy storage system according to claim 3, wherein said compression unit further comprises: a first valve and a second valve;
The first valve is arranged between the gas storage bin and the compressor;
the second valve is arranged between the intercooler and the air storage tank.
5. The novel composite energy storage system of claim 1, wherein the expansion power generation unit comprises: an expander and a second motor;
The air inlet of the expansion machine is connected with the air outlet of the air storage tank, the air outlet of the expansion machine is connected with the air inlet of the air storage bin, the rotating shaft of the second motor is connected with the rotating shaft of the expansion machine, the expansion machine is used for expanding carbon dioxide gas released by the air storage tank to do work, driving the second motor to rotate to generate electricity, and inputting the expanded carbon dioxide gas into the air storage bin.
6. The novel composite energy storage system of claim 5, wherein said expansion power generation unit further comprises: a heater;
the heater is arranged between the gas storage tank and the expansion machine, and is used for heating carbon dioxide gas released by the gas storage tank.
7. The novel composite energy storage system of claim 6, wherein said expansion power generation unit further comprises: a third valve and a fourth valve;
The third valve is arranged between the air storage tank and the heater;
the fourth valve is arranged between the expansion machine and the gas storage bin.
8. The novel composite energy storage system of claim 1, wherein the air storage tank further comprises: a blocking device;
the blocking device is arranged at the top end of the air storage tank and used for limiting the maximum height of the weight block lifted upwards.
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| CN117318127B (en) * | 2023-11-30 | 2024-02-23 | 国网江苏省电力有限公司经济技术研究院 | Coordination control system, method and equipment for composite energy storage |
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| CN115182858B (en) * | 2022-08-11 | 2023-02-17 | 北京科技大学 | Air compression and gravitational potential energy mixed storage/generation power generation system and quantitative design method |
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