CN214464462U - Constant-pressure type compressed carbon dioxide energy storage system - Google Patents
Constant-pressure type compressed carbon dioxide energy storage system Download PDFInfo
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- CN214464462U CN214464462U CN202120654654.1U CN202120654654U CN214464462U CN 214464462 U CN214464462 U CN 214464462U CN 202120654654 U CN202120654654 U CN 202120654654U CN 214464462 U CN214464462 U CN 214464462U
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Abstract
A constant-pressure compressed carbon dioxide energy storage system comprises a compressor, a turbine, a high-pressure storage tank, a low-pressure storage tank, a high-pressure stabilizing tank, a low-pressure stabilizing tank and a cooler; the utility model converts surplus electric power into high-pressure carbon dioxide by the compressor and stores the carbon dioxide in the high-pressure storage tank; when the electric power is insufficient, the carbon dioxide in the high-pressure storage tank pushes the turbine to do work, and the turbine further drives the generator to generate electricity; the low-pressure carbon dioxide discharged by the turbine is cooled to a certain temperature and then stored in a low-pressure storage tank. When the quality of the carbon dioxide in the high-pressure storage tank and the low-pressure storage tank is changed, the pressure in the tanks can be kept unchanged by moving the pistons; in order to further maintain the inlet pressure of the compressor and the turbine to be stable, a low-pressure stabilizing tank and a high-pressure stabilizing tank are respectively arranged at the inlets of the compressor and the turbine. The utility model can effectively improve the energy density and the energy storage efficiency of the energy storage system; meanwhile, the system has the advantages of compact and simple structure and low control difficulty.
Description
Technical Field
The utility model relates to an energy storage technical field, in particular to constant voltage formula compression carbon dioxide energy storage system.
Background
At present, the mature energy storage technology includes electrochemical energy storage, compressed air energy storage and the like. However, the electrochemical energy storage has short service life, low power and high cost; the compressed air energy storage technology has low energy density and large storage tank volume due to low air density. The carbon dioxide is non-toxic and pollution-free, the physical property is stable, the temperature of a critical point is 31.1 ℃, the critical pressure is 7.38MPa, the critical parameter is low, the supercritical state is easy to realize, and the density is high, so that the energy storage system taking the compressed carbon dioxide as the working medium can effectively solve the problem of low energy storage density; meanwhile, the volume of the equipment can be obviously reduced, so that the system is more compact. However, the existing compressed carbon dioxide energy storage system has more equipment and complex configuration, and the pressure in the carbon dioxide storage tank changes along with the charging or discharging process, so that the turbine or the compressor deviates from the design working condition, and the system efficiency is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a constant pressure type compressed carbon dioxide energy storage system, through the higher carbon dioxide energy storage of compression density, can effectively improve system energy density and energy storage efficiency, simultaneously, the equipment volume is less, can increase the compact degree of system, and system structure is simple, can reduce the system control degree of difficulty.
In order to realize the purpose, the utility model discloses a technical scheme is:
a constant-pressure type compressed carbon dioxide energy storage system comprises a compressor 1, a high-pressure storage tank 2, a high-pressure surge tank 3, a turbine 4, a cooler 5, a low-pressure storage tank 6 and a low-pressure surge tank 7, wherein an outlet of the compressor 1 is communicated with an inlet of the high-pressure storage tank 2, an outlet of the high-pressure storage tank 2 is communicated with an inlet of the high-pressure surge tank 3, an outlet of the high-pressure surge tank 3 is communicated with an inlet of the turbine 4, an outlet of the turbine 4 is communicated with an inlet of the cooler 5, an outlet of the cooler 5 is communicated with an inlet of the low-pressure storage tank 6, an outlet of the low-pressure storage tank 6 is communicated with an inlet of the low-pressure surge tank 7, and an outlet of the low-pressure surge tank 7 is communicated with an inlet of the compressor 1;
wherein low pressure surge tank 7, compressor 1 and high pressure storage tank 2 constitute charging system, and high pressure surge tank 3, turbine 4, cooler 5 and low pressure storage tank 6 constitute discharge system, and high pressure storage tank 2 and high pressure surge tank (3) constitute high pressure surge system, and low pressure storage tank 6 and low pressure surge tank 7 constitute low pressure surge system.
The high-pressure storage tank 2 adopts a piston type, the pressure in the high-pressure storage tank 2 is maintained by moving the position of the piston, and the high-pressure stabilizing tank 3 prevents the inlet pressure fluctuation of the turbine 4 through the buffer action.
The low-pressure storage tank 6 adopts a piston type, the pressure in the low-pressure storage tank 6 is maintained by moving the position of the piston, and the low-pressure stabilizing tank 7 prevents the inlet pressure fluctuation of the compressor 1 through the buffer action.
The inlet temperature of the compressor 1 is 32-34 ℃, and the inlet pressure of the compressor 1 is 8.0-8.5 MPa. The carbon dioxide sucked by the compressor 1 comes from the low-pressure storage tank 6, on one hand, the wall thickness of the low-pressure storage tank 6 can be reduced by lower pressure; on the other hand, when the temperature is 32-34 ℃, the carbon dioxide still has higher density under lower pressure, and the volume of the low-pressure storage tank 6 can be effectively reduced under the same mass, so that the cost and the floor area of the low-pressure storage tank 6 are reduced.
The outlet pressure of the compressor 1 is 20-40 MPa. Selecting this range for the compressor 1 outlet pressure allows the system to have a higher energy storage efficiency.
A constant pressure type compressed carbon dioxide energy storage system operation method, during charging, low pressure carbon dioxide in a low pressure storage tank 6 firstly enters a low pressure stabilizing tank 7, then enters a compressor 1 from the low pressure stabilizing tank 7, the compressor 1 consumes redundant electric power, the low pressure carbon dioxide is compressed into high pressure carbon dioxide, and the high pressure carbon dioxide is stored in a high pressure storage tank 2; in the process of releasing carbon dioxide by the low-pressure storage tank 6, the volume of the storage tank is adjusted by moving the position of the piston, so that the pressure in the tank is maintained to be stable, the pressure fluctuation at the inlet of the compressor 1 can be further reduced by the low-pressure stabilizing tank 7, and in the process of storing carbon dioxide by the high-pressure storage tank 2, the pressure in the tank is also maintained to be stable by moving the position of the piston;
during discharging, high-pressure carbon dioxide in the high-pressure storage tank 2 firstly enters the high-pressure stabilizing tank 3, then enters the turbine 4 from the high-pressure stabilizing tank 3 to do work, and pushes the generator to generate electricity, in the process of releasing carbon dioxide by the high-pressure storage tank 2, the pressure in the tank is maintained to be stable by moving the position of the piston, the high-pressure stabilizing tank 3 is used for further reducing the pressure fluctuation at the inlet of the turbine 4, after the high-pressure carbon dioxide expands in the turbine 4, the pressure is reduced, after the low-pressure carbon dioxide is cooled to a certain temperature by the cooler 5, the low-pressure carbon dioxide is stored in the low-pressure storage tank 6, in the process of storing carbon dioxide by the low-pressure storage tank 6, the pressure in the tank is maintained to be stable by moving the position of the piston.
The high pressure means that the pressure of the carbon dioxide is increased to 20-40 MPa after the carbon dioxide is compressed by the compressor 1; the low pressure means that the pressure is reduced to 8.0-8.5 MPa after the carbon dioxide expands and works in the turbine 4; the certain temperature means that the carbon dioxide is cooled to 32-34 ℃ in the cooler 5.
The utility model has the advantages that:
the utility model adopts the compressed carbon dioxide as the energy storage medium, which can effectively improve the energy density and the energy storage efficiency of the system; meanwhile, the equipment volume is smaller, compared with a compressed air energy storage system, the compressed carbon dioxide has high density, and the volumes of a heat exchanger, a storage tank and a turbine of the compressed carbon dioxide energy storage system can be smaller under the same power, so that the system compactness can be increased; the system has simple structure and can reduce the control difficulty of the system.
Drawings
Fig. 1 is a schematic view of the constant-pressure compressed carbon dioxide energy storage system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a constant-pressure compressed carbon dioxide energy storage system comprises a compressor 1, a high-pressure storage tank 2, a high-pressure surge tank 3, a turbine 4, a cooler 5, a low-pressure storage tank 6 and a low-pressure surge tank 7;
the outlet of the compressor 1 is communicated with the inlet of the high-pressure storage tank 2, the outlet of the high-pressure storage tank 2 is communicated with the inlet of the high-pressure surge tank 3, the outlet of the high-pressure surge tank 3 is communicated with the inlet of the turbine 4, the outlet of the turbine 4 is communicated with the inlet of the cooler 5, the outlet of the cooler 5 is communicated with the inlet of the low-pressure storage tank 6, the outlet of the low-pressure storage tank 6 is communicated with the inlet of the low-pressure surge tank 7, and the outlet of the low-pressure surge tank 7 is communicated with the inlet of the compressor 1.
As the preferred embodiment of the present invention, the low-pressure surge tank 7, the compressor 1 and the high-pressure storage tank 2 are sequentially connected to form a charging system.
As a preferred embodiment of the present invention, the high-pressure surge tank 3, the turbine 4, the cooler 5, and the low-pressure storage tank 6 are sequentially connected to form a discharge system.
As the utility model discloses a preferred embodiment, high-pressure storage tank 2 and high-pressure surge tank 3 constitute high-pressure steady voltage system, and high-pressure storage tank 2 adopts the piston, maintains the pressure in high-pressure storage tank 2 through removing the piston position, simultaneously, utilizes the cushioning effect of high-pressure surge tank 3 to prevent turbine 4 entry pressure fluctuation.
As the preferred embodiment of the present invention, the low pressure storage tank 6 and the low pressure surge tank 7 constitute a low pressure surge system, and the low pressure storage tank 6 adopts a piston type, and maintains the pressure in the low pressure storage tank 6 by moving the piston position, and at the same time, prevents the inlet pressure fluctuation of the compressor 1 by the buffering action of the low pressure surge tank 7.
As the preferred embodiment of the utility model, the inlet temperature of the compressor 1 is 32-34 ℃, and the inlet pressure of the compressor 1 is 8.0-8.5 MPa.
As the preferred embodiment of the present invention, the outlet pressure of the compressor 1 is 20 to 40 MPa.
As shown in fig. 1, in a method for operating a constant-pressure compressed carbon dioxide energy storage system, during charging, low-pressure carbon dioxide in a low-pressure storage tank 6 firstly enters a low-pressure surge tank 7 and then enters a compressor 1 from the low-pressure surge tank 7, the compressor 1 consumes redundant electric power to compress the low-pressure carbon dioxide into high-pressure carbon dioxide, and the high-pressure carbon dioxide is stored in a high-pressure storage tank 2. During the process of releasing carbon dioxide from the low-pressure storage tank 6, the volume of the storage tank is adjusted by moving the position of the piston, so that the pressure in the tank is kept stable. The low pressure surge tank 7 may further reduce compressor 1 inlet pressure fluctuations. The high pressure storage tank 2 maintains the pressure in the tank steady during storage of carbon dioxide, also by moving the piston position.
During discharging, high-pressure carbon dioxide in the high-pressure storage tank 2 firstly enters the high-pressure stabilizing tank 3, then enters the turbine 4 from the high-pressure stabilizing tank 3 to do work, and pushes the generator to generate electricity. The high pressure storage tank 2 also maintains the pressure in the tank steady during the release of carbon dioxide by moving the piston position. The high pressure surge tank 3 may further reduce turbine 4 inlet pressure fluctuations. After the high-pressure carbon dioxide is expanded in the turbine 4, the pressure is reduced, and the low-pressure carbon dioxide is cooled to a certain temperature by the cooler 5 and then stored in the low-pressure storage tank 6. The low pressure storage tank 6 maintains the pressure in the tank steady during storage of carbon dioxide, also by moving the piston position.
The method introduces the operation process of charging and discharging of the constant-voltage compressed carbon dioxide energy storage system, and the method can ensure the stable and safe operation of the system.
Claims (5)
1. A constant-pressure type compressed carbon dioxide energy storage system is characterized by comprising a compressor (1), a high-pressure storage tank (2), a high-pressure stabilizing tank (3), a turbine (4), a cooler (5), a low-pressure storage tank (6) and a low-pressure stabilizing tank (7), wherein an outlet of the compressor (1) is communicated with an inlet of the high-pressure storage tank (2), an outlet of the high-pressure storage tank (2) is communicated with an inlet of the high-pressure stabilizing tank (3), an outlet of the high-pressure stabilizing tank (3) is communicated with an inlet of the turbine (4), an outlet of the turbine (4) is communicated with an inlet of the cooler (5), an outlet of the cooler (5) is communicated with an inlet of the low-pressure storage tank (6), an outlet of the low-pressure storage tank (6) is communicated with an inlet of the low-pressure stabilizing tank (7), and an outlet of the low-pressure stabilizing tank (7) is communicated with an inlet of the compressor (1);
the low-pressure stabilizing tank (7), the compressor (1) and the high-pressure storage tank (2) form a charging system, the high-pressure stabilizing tank (3), the turbine (4), the cooler (5) and the low-pressure storage tank (6) form a discharging system, the high-pressure storage tank (2) and the high-pressure stabilizing tank (3) form a high-pressure stabilizing system, and the low-pressure storage tank (6) and the low-pressure stabilizing tank (7) form a low-pressure stabilizing system.
2. The constant-pressure compressed carbon dioxide energy storage system according to claim 1, wherein the high-pressure storage tank (2) adopts a piston type, the pressure in the high-pressure storage tank (2) is maintained by moving the position of the piston, and the high-pressure surge tank (3) prevents the inlet pressure fluctuation of the turbine (4) through a buffer action.
3. The constant-pressure compressed carbon dioxide energy storage system according to claim 1, wherein the low-pressure storage tank (6) adopts a piston type, the pressure in the low-pressure storage tank (6) is maintained by moving the position of the piston, and the low-pressure surge tank (7) prevents the inlet pressure fluctuation of the compressor (1) through a buffer action.
4. The constant-pressure compressed carbon dioxide energy storage system according to claim 1, wherein the inlet temperature of the compressor (1) is 32-34 ℃, and the inlet pressure of the compressor (1) is 8.0-8.5 MPa.
5. The constant-pressure compressed carbon dioxide energy storage system according to claim 1, wherein the outlet pressure of the compressor (1) is 20-40 MPa.
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| CN202120654654.1U CN214464462U (en) | 2021-03-31 | 2021-03-31 | Constant-pressure type compressed carbon dioxide energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116412105A (en) * | 2023-04-17 | 2023-07-11 | 青岛科技大学 | Operation regulation and control device and method for compressed gas energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116412105A (en) * | 2023-04-17 | 2023-07-11 | 青岛科技大学 | Operation regulation and control device and method for compressed gas energy storage system |
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