CN117889094A - Compressor unit of small-flow compressed carbon dioxide energy storage system and operation method - Google Patents
Compressor unit of small-flow compressed carbon dioxide energy storage system and operation method Download PDFInfo
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- CN117889094A CN117889094A CN202410093259.9A CN202410093259A CN117889094A CN 117889094 A CN117889094 A CN 117889094A CN 202410093259 A CN202410093259 A CN 202410093259A CN 117889094 A CN117889094 A CN 117889094A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 23
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 53
- 230000006835 compression Effects 0.000 claims abstract description 52
- 238000003860 storage Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
Abstract
A compressor unit of a small-flow compressed carbon dioxide energy storage system and an operation method belong to the technical field of compressed gas energy storage. The invention solves the problems of low final stage compression efficiency, high processing difficulty and low compression efficiency. The technical key points are as follows: the inlet end of the first-stage compressor is filled with low-pressure gas, an intercooler and a buffer tank are arranged on a pipeline between two adjacent stages of compressors, a branch is connected between the intercooler and the inlet pipeline of the next-stage compressor, a valve is arranged on the branch, a valve is also arranged on the inlet and outlet pipeline of the buffer tank, and the last-stage compressor is sequentially connected with the intercooler and the high-pressure gas storage tank. In the invention, low-pressure gas enters a high-pressure gas storage tank after being subjected to multistage compression and interstage cooling. A buffer tank is arranged between two adjacent stages of compression, and the buffer tank is used for temporarily storing compressed gas; the invention brings more convenience to the design and manufacture of the compressor, and can ensure that the compressor operates in a high-efficiency state, thereby improving the efficiency of the energy storage system.
Description
Technical Field
The invention relates to a carbon dioxide energy storage system compressor unit and an operation method, in particular to a small-flow compressed carbon dioxide energy storage system compressor unit and an operation method, and belongs to the technical field of compressed gas energy storage.
Background
The compressed gas energy storage is used as a novel energy storage technology, has the advantages of long energy storage time, large capacity, long service life, safety, reliability and the like, and is a large-scale physical energy storage technology with great potential at present. The compressed air energy storage working medium commonly used at present is air and carbon dioxide, and the compressed air energy storage working medium has the advantages of mature technology, low cost, easy obtainment of working medium and the like, and enters the early stage of commercialization. In contrast, compressed carbon dioxide energy storage is still in the demonstration stage, but the compressed carbon dioxide energy storage has higher efficiency and more compact system arrangement, and the system cost is further reduced and the advantages are more remarkable with the development of technology in the future.
The principle of the compressed gas energy storage technology is that low-valley electricity/wind-abandoning/light-abandoning electricity is stored in the compressed gas, and the compressed gas expands to apply work to release energy outwards in the electricity utilization peak period.
The higher the compressed gas pressure, the more electrical energy the system stores. For compressed air energy storage, air is compressed from 0.1MPa to 10-14 MPa; for carbon dioxide working media, in order to realize more efficient supercritical circulation, the pressure is raised to more than 14MPa, and even higher. As system power levels and efficiency increase, future system pressures may further increase. This places high demands on the compressor system, which is not met by single stage compression, and often requires three or even four stages of compression. The higher the pressure of the compressor, the smaller the volume flow, the lower the blade height, the more difficult the processing and manufacturing is, and the compression efficiency is difficult to meet the system requirements.
For compressed carbon dioxide energy storage, under the condition of the same power, the flow rate of a working medium of carbon dioxide is smaller than that of air, the working condition of a compressor is more severe, the manufacturing and processing difficulty of the compressor is higher, the final stage compression efficiency is lower, and the energy storage efficiency of a system is seriously influenced.
In the conventional gas energy storage multi-stage compression process, the inlet mass flow of each stage of compressor is the same, the inlet volume flow of the compressor is reduced step by step in the step-by-step boosting process, the more the volume flow of the later stages is reduced, the smaller the volume flow of the final stage compressor, particularly the outlet of the final stage compressor, is, the final stage blade height is reduced sharply, the final stage compression efficiency is very low, the overall compression efficiency is influenced, and the blade design and processing difficulty is increased.
Disclosure of Invention
In order to overcome the problems of low final stage compression efficiency, high processing difficulty and low compression efficiency, the present invention provides a low flow compressed carbon dioxide energy storage system compressor unit and method of operation, a brief summary of which is provided below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
The technical scheme of the invention is as follows:
Scheme one: the utility model provides a low-flow compression carbon dioxide energy storage system compressor unit, includes the compressor that sets up through the multistage series connection of pipeline, and the entrance point of first stage compressor lets in low-pressure gas, has arranged intercooler and buffer tank on the pipeline between the adjacent two-stage compressor, is connected with the branch road between the import pipeline of intercooler and next stage compressor, install the valve on the branch road, also install the valve on the import and export pipeline of buffer tank, last stage compressor and intercooler, high-pressure gas storage tank connect gradually.
As a further improvement of the invention, the compressor unit of the low-flow compressed carbon dioxide energy storage system comprises three stages of compressors which are arranged in series and are defined as a first stage compressor, a middle stage compressor and a final stage compressor, and further comprises a first intercooler, a second intercooler, a third intercooler, a first buffer tank, a second buffer tank, a high-pressure gas storage tank, a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve;
The inlet end of the first-stage compressor is filled with low-pressure gas, the outlet of the first-stage compressor is connected with the intermediate-stage compressor through a first pipeline, a first intercooler and a first buffer tank are arranged on the first pipeline, the first intercooler is also connected with one end of a first branch, the other end of the first branch is connected with the first pipeline, the connecting point is positioned between the first buffer tank and the intermediate-stage compressor, a first valve and a third valve are arranged on the first pipeline, the first valve is arranged between the first intercooler and the first buffer tank, the third valve is arranged at the outlet end of the first buffer tank, and the second valve is arranged on the first branch;
The outlet of the intermediate-stage compressor is connected with the final-stage compressor through a second pipeline, a second intercooler and a second buffer tank are arranged on the second pipeline, the second intercooler is also connected with one end of a second branch, the other end of the second branch is connected with the second pipeline, the connecting point is positioned between the second buffer tank and the final-stage compressor, a fourth valve and a sixth valve are arranged on the second pipeline, the fourth valve is arranged between the second intercooler and the second buffer tank, the sixth valve is arranged at the outlet end of the second buffer tank, and the fifth valve is arranged on the second branch;
The outlet of the final stage compressor is connected with a high-pressure gas storage tank through a third pipeline, and a third intercooler is further arranged on the third pipeline.
Scheme II: an operation method of a compressor unit of a small-flow compressed carbon dioxide energy storage system,
At the initial moment, all valves are closed;
Within 0-T1 hours, the first valve is opened, the first-stage compressor works, the middle-stage compressor and the last-stage compressor do not work, low-pressure gas enters the first-stage compressor to be compressed, and enters the first buffer tank to be temporarily stored after being cooled by the first intercooler;
Within T1-T2 hours: the first valve is closed, the second valve, the third valve and the fourth valve are opened, the first-stage compressor and the middle-stage compressor work, the last-stage compressor does not work, low-pressure gas is compressed by the first-stage compressor and then directly enters the middle-stage compressor for compression after passing through the first intercooler, and meanwhile, the gas in the first buffer tank also enters the middle-stage compressor for compression; the gas compressed by the intermediate-stage compressor enters a second buffer tank through a second intercooler for temporary storage;
T3 hours: the first valve and the fourth valve are closed, the second valve, the third valve, the fifth valve and the sixth valve are opened, the first-stage compressor, the middle-stage compressor and the last-stage compressor work simultaneously, low-pressure gas is compressed by the first-stage compressor and then directly enters the middle-stage compressor for compression after passing through the first intercooler, and meanwhile, the gas in the first buffer tank also enters the middle-stage compressor for compression; and the gas compressed by the intermediate-stage compressor directly enters the final-stage compressor for compression after passing through the second intercooler, and meanwhile, the gas in the second buffer tank also enters the final-stage compressor for compression, and the compressed gas enters the high-pressure gas storage tank after passing through the third intercooler to finish high-pressure gas storage.
As a further improvement of the invention, the operation method of the compressor unit of the low-flow compressed carbon dioxide energy storage system sets the energy storage time of the unit to 8 hours, the inlet pressures of the first-stage compressor, the middle-stage compressor and the final-stage compressor are respectively 0.1MPa, 0.46MPa and 2.2MPa, and the outlet pressure of the final-stage compressor is 7-10 MPa;
at the initial moment, all valves are closed;
Within 0-2 hours, the first valve is opened, the first-stage compressor works, the middle-stage compressor and the last-stage compressor do not work, low-pressure gas enters the first-stage compressor to be compressed, and enters the first buffer tank to be temporarily stored after being cooled by the first intercooler;
Within the 3 rd to 7 th hours: the first valve is closed, the second valve, the third valve and the fourth valve are opened, the first-stage compressor and the middle-stage compressor work, the last-stage compressor does not work, low-pressure gas is compressed by the first-stage compressor and then directly enters the middle-stage compressor for compression after passing through the first intercooler, and meanwhile, the gas in the first buffer tank also enters the middle-stage compressor for compression; the gas compressed by the intermediate-stage compressor enters a second buffer tank through a second intercooler for temporary storage;
hour 8: the first valve and the fourth valve are closed, the second valve, the third valve, the fifth valve and the sixth valve are opened, the first-stage compressor, the middle-stage compressor and the last-stage compressor work simultaneously, low-pressure gas is compressed by the first-stage compressor and then directly enters the middle-stage compressor for compression after passing through the first intercooler, and meanwhile, the gas in the first buffer tank also enters the middle-stage compressor for compression; and the gas compressed by the intermediate-stage compressor directly enters the final-stage compressor for compression after passing through the second intercooler, and meanwhile, the gas in the second buffer tank also enters the final-stage compressor for compression, and the compressed gas enters the high-pressure gas storage tank after passing through the third intercooler to finish high-pressure gas storage.
The beneficial effects of the invention are as follows:
1. In the invention, low-pressure gas enters a high-pressure gas storage tank after being subjected to multistage compression and interstage cooling. A buffer tank is arranged between the adjacent two stages of compression, and the buffer tank is used for temporarily storing the compressed gas.
2. The invention brings more convenience to the design and manufacture of the compressor, and can ensure that the compressor operates in a high-efficiency state, thereby improving the efficiency of the energy storage system.
3. The inlet volume flow of each stage of compressor is in the same order of magnitude, so that the problems of low final stage compression efficiency and high processing difficulty are effectively avoided, and the compression efficiency is remarkably improved.
4. The system has strong adjustment capability, and realizes the compression time-sharing or simultaneous operation of each stage through valve control. Different operation strategies can be adopted under different load conditions, so that each stage of compression is operated under a high-efficiency working condition, and the energy-saving and consumption-reducing effects are better.
5. The invention has short starting and stopping time, and the interstage buffer tank can effectively improve the starting and stopping speed of the compressor.
Drawings
FIG. 1 is a block diagram of a compressor unit of a low flow compressed carbon dioxide energy storage system;
In the figure: 1-a first stage compressor; 2-a medium-stage compressor; 3-final stage compressor; 4-a first intercooler; 5-a second intercooler; 6-a third intercooler; 7-a first buffer tank; 8-a second buffer tank; 9-a high pressure gas storage tank; f1-a first valve; f2-a second valve; f3-a third valve; f4—fourth valve; f5—fifth valve; f6—sixth valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention. It should be further understood that the terms "first," "second," "third," and the like in this specification are used merely for distinguishing between various components, elements, steps, etc. in the specification and not for indicating a logical or sequential relationship between the various components, elements, steps, etc., unless otherwise indicated.
Embodiment 1, which is described with reference to fig. 1, provides a compressor unit of a low-flow compressed carbon dioxide energy storage system, including three compressors arranged in series, which are defined as a first compressor 1, a middle compressor 2 and a final compressor 3, and further including a first intercooler 4, a second intercooler 5, a third intercooler 6, a first buffer tank 7, a second buffer tank 8, a high-pressure gas storage tank 9, a first valve F1, a second valve F2, a third valve F3, a fourth valve F4, a fifth valve F5 and a sixth valve F6;
The inlet end of the first-stage compressor 1 is filled with low-pressure gas, the outlet of the first-stage compressor 1 is connected with the intermediate-stage compressor 2 through a first pipeline, a first intercooler 4 and a first buffer tank 7 are arranged on the first pipeline, the first intercooler 4 is also connected with one end of a first branch, the other end of the first branch is connected with the first pipeline, the connecting point is positioned between the first buffer tank 7 and the intermediate-stage compressor 2, a first valve F1 and a third valve F3 are arranged on the first pipeline, the first valve F1 is arranged between the first intercooler 4 and the first buffer tank 7, the third valve F3 is arranged at the outlet end of the first buffer tank 7, and a second valve F2 is arranged on the first branch;
The outlet of the middle-stage compressor 2 is connected with the final-stage compressor 3 through a second pipeline, a second intercooler 5 and a second buffer tank 8 are arranged on the second pipeline, the second intercooler 5 is also connected with one end of a second branch, the other end of the second branch is connected with the second pipeline, the connecting point is positioned between the second buffer tank 8 and the final-stage compressor 3, a fourth valve F4 and a sixth valve F6 are arranged on the second pipeline, the fourth valve F4 is arranged between the second intercooler 5 and the second buffer tank 8, the sixth valve F6 is arranged at the outlet end of the second buffer tank 8, and the fifth valve F5 is arranged on the second branch;
The outlet of the final stage compressor 3 is connected with a high-pressure gas storage tank 9 through a third pipeline, and a third intercooler 6 is further arranged on the third pipeline.
Embodiment 2, referring to fig. 1, illustrates the present embodiment, which provides an operation method of a compressor unit of a low-flow compressed carbon dioxide energy storage system, wherein the energy storage duration of the unit is set to 8 hours, the inlet pressures of a first-stage compressor 1, a middle-stage compressor 2 and a final-stage compressor 3 are respectively 0.1MPa, 0.46MPa and 2.2MPa, and the outlet pressure of the final-stage compressor 3 is 7-10 MPa;
if a conventional equal mass flow mode is adopted, the volume flow ratio of the inlets of the three-stage compressor is 1:0.152:0.023, and the volume flow of the inlet of the 3 rd stage compression is only 1/44 of that of the inlet of the 1 st stage.
If the operation mode of the embodiment is adopted, through arranging the buffer tanks between the stages, the volume flow ratio of the inlets of the three-stage compressor is 1:0.2:0.3, compared with the design of equal mass flow, the volume flow of the compression inlets of the 2 nd stage and the 3 rd stage is respectively improved by 1.3 times and 13.2 times, more convenience is brought to the design and the manufacture of the compressor, the operation of the compressor in a high-efficiency state can be ensured, and therefore the efficiency of an energy storage system is improved.
In this case, the operating times for the 1 st, 2 nd and 3 rd stage compression are 8, 6 and 1 hour, respectively.
The specific operation method is as follows:
at the initial moment, all valves are closed;
Within 0-2 hours, the first valve F1 is opened, the first-stage compressor 1 works, the middle-stage compressor 2 and the last-stage compressor 3 do not work, low-pressure gas enters the first-stage compressor to be compressed, and enters the first buffer tank 7 for temporary storage after being cooled by the first intercooler 4;
Within the 3 rd to 7 th hours: the first valve F1 is closed, the second valve F2, the third valve F3 and the fourth valve F4 are opened, the first-stage compressor 1 and the middle-stage compressor 2 work, the last-stage compressor 3 does not work, low-pressure gas is compressed by the first-stage compressor 1 and then directly enters the middle-stage compressor 2 for compression after passing through the first intercooler 4, and meanwhile, the gas in the first buffer tank 7 also enters the middle-stage compressor 2 for compression; the gas compressed by the intermediate-stage compressor 2 enters a second buffer tank 8 through a second intercooler 5 for temporary storage;
Hour 8: the first valve F1 and the fourth valve F4 are closed, the second valve F2, the third valve F3, the fifth valve F5 and the sixth valve F6 are opened, the first-stage compressor 1, the middle-stage compressor 2 and the last-stage compressor 3 work simultaneously, low-pressure gas is compressed by the first-stage compressor 1 and then directly enters the middle-stage compressor 2 for compression after passing through the first intercooler 4, and meanwhile, the gas in the first buffer tank 7 also enters the middle-stage compressor 2 for compression; the gas compressed by the intermediate-stage compressor 2 directly enters the final-stage compressor 3 for compression after passing through the second intercooler 5, and meanwhile, the gas in the second buffer tank 8 also enters the final-stage compressor 3 for compression, and the compressed gas enters the high-pressure gas storage tank 9 after passing through the third intercooler 6 to finish high-pressure gas storage.
The foregoing embodiments have further described the objects, technical solutions and advantageous effects of the present application in detail, and it should be understood that the foregoing embodiments are merely examples of the present application and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the scope of the present application.
Claims (4)
1. The compressor unit of the low-flow compressed carbon dioxide energy storage system is characterized by comprising compressors which are arranged in series through multiple stages of pipelines, low-pressure gas is introduced into the inlet end of a first-stage compressor, an intercooler and a buffer tank are arranged on the pipeline between two adjacent stages of compressors, a branch is connected between the intercooler and the inlet pipeline of the next-stage compressor, a valve is arranged on the branch, a valve is also arranged on the inlet and outlet pipeline of the buffer tank, and the last-stage compressor is sequentially connected with the intercooler and the high-pressure gas storage tank.
2. The low flow compressed carbon dioxide energy storage system compressor train of claim 1, wherein: the system comprises compressors arranged in series three stages, namely a first stage compressor (1), a middle stage compressor (2) and a final stage compressor (3), and further comprises a first intercooler (4), a second intercooler (5), a third intercooler (6), a first buffer tank (7), a second buffer tank (8), a high-pressure gas storage tank (9), a first valve (F1), a second valve (F2), a third valve (F3), a fourth valve (F4), a fifth valve (F5) and a sixth valve (F6);
The low-pressure gas is introduced into the inlet end of the first-stage compressor (1), the outlet of the first-stage compressor (1) is connected with the intermediate-stage compressor (2) through a first pipeline, a first intercooler (4) and a first buffer tank (7) are arranged on the first pipeline, the first intercooler (4) is also connected with one end of a first branch, the other end of the first branch is connected with the first pipeline, a connecting point is positioned between the first buffer tank (7) and the intermediate-stage compressor (2), a first valve (F1) and a third valve (F3) are arranged on the first pipeline, the first valve (F1) is arranged between the first intercooler (4) and the first buffer tank (7), the third valve (F3) is arranged at the outlet end of the first buffer tank (7), and the second valve (F2) is arranged on the first branch;
the outlet of the middle-stage compressor (2) is connected with the final-stage compressor (3) through a second pipeline, a second intercooler (5) and a second buffer tank (8) are arranged on the second pipeline, the second intercooler (5) is also connected with one end of a second branch, the other end of the second branch is connected with the second pipeline, the connecting point is positioned between the second buffer tank (8) and the final-stage compressor (3), a fourth valve (F4) and a sixth valve (F6) are arranged on the second pipeline, the fourth valve (F4) is arranged between the second intercooler (5) and the second buffer tank (8), the sixth valve (F6) is arranged at the outlet end of the second buffer tank (8), and the fifth valve (F5) is arranged on the second branch;
the outlet of the final stage compressor (3) is connected with a high-pressure gas storage tank (9) through a third pipeline, and a third intercooler (6) is further arranged on the third pipeline.
3. A method of operating the low flow compressed carbon dioxide energy storage system compressor train of claim 2, wherein: at the initial moment, all valves are closed;
Within 0-T1 hours, the first valve (F1) is opened, the first-stage compressor (1) works, the middle-stage compressor (2) and the last-stage compressor (3) do not work, low-pressure gas enters the first-stage compressor to be compressed, and enters the first buffer tank (7) for temporary storage after being cooled by the first intercooler (4);
Within T1-T2 hours: the first valve (F1) is closed, the second valve (F2), the third valve (F3) and the fourth valve (F4) are opened, the first-stage compressor (1) and the middle-stage compressor (2) work, the last-stage compressor (3) does not work, low-pressure gas is compressed by the first-stage compressor (1) and then directly enters the middle-stage compressor (2) for compression after passing through the first intercooler (4), and meanwhile, the gas in the first buffer tank (7) also enters the middle-stage compressor (2) for compression; the gas compressed by the intermediate-stage compressor (2) enters a second buffer tank (8) through a second intercooler (5) for temporary storage;
T3 hours: the first valve (F1), the fourth valve (F4) are closed, the second valve (F2), the third valve (F3), the fifth valve (F5) and the sixth valve (F6) are opened, the first-stage compressor (1), the middle-stage compressor (2) and the last-stage compressor (3) work simultaneously, low-pressure gas is compressed by the first-stage compressor (1) and then directly enters the middle-stage compressor (2) for compression after passing through the first intercooler (4), and meanwhile, the gas in the first buffer tank (7) also enters the middle-stage compressor (2) for compression; the gas compressed by the intermediate-stage compressor (2) directly enters the final-stage compressor (3) for compression after passing through the second intercooler (5), and meanwhile, the gas in the second buffer tank (8) also enters the final-stage compressor (3) for compression, and the compressed gas enters the high-pressure gas storage tank (9) after passing through the third intercooler (6) to finish high-pressure gas storage.
4. A method of operating a compressor train of a low flow compressed carbon dioxide energy storage system according to claim 3, wherein: setting the energy storage time length of the unit to be 8 hours, wherein the inlet pressures of the first-stage compressor (1), the middle-stage compressor (2) and the final-stage compressor (3) are respectively 0.1MPa, 0.46MPa and 2.2MPa, and the outlet pressure of the final-stage compressor (3) is 7-10 MPa;
at the initial moment, all valves are closed;
Within 0-2 hours, the first valve (F1) is opened, the first-stage compressor (1) works, the middle-stage compressor (2) and the last-stage compressor (3) do not work, low-pressure gas enters the first-stage compressor to be compressed, and enters the first buffer tank (7) for temporary storage after being cooled by the first intercooler (4);
Within the 3 rd to 7 th hours: the first valve (F1) is closed, the second valve (F2), the third valve (F3) and the fourth valve (F4) are opened, the first-stage compressor (1) and the middle-stage compressor (2) work, the last-stage compressor (3) does not work, low-pressure gas is compressed by the first-stage compressor (1) and then directly enters the middle-stage compressor (2) for compression after passing through the first intercooler (4), and meanwhile, the gas in the first buffer tank (7) also enters the middle-stage compressor (2) for compression; the gas compressed by the intermediate-stage compressor (2) enters a second buffer tank (8) through a second intercooler (5) for temporary storage;
Hour 8: the first valve (F1), the fourth valve (F4) are closed, the second valve (F2), the third valve (F3), the fifth valve (F5) and the sixth valve (F6) are opened, the first-stage compressor (1), the middle-stage compressor (2) and the last-stage compressor (3) work simultaneously, low-pressure gas is compressed by the first-stage compressor (1) and then directly enters the middle-stage compressor (2) for compression after passing through the first intercooler (4), and meanwhile, the gas in the first buffer tank (7) also enters the middle-stage compressor (2) for compression; the gas compressed by the intermediate-stage compressor (2) directly enters the final-stage compressor (3) for compression after passing through the second intercooler (5), and meanwhile, the gas in the second buffer tank (8) also enters the final-stage compressor (3) for compression, and the compressed gas enters the high-pressure gas storage tank (9) after passing through the third intercooler (6) to finish high-pressure gas storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410093259.9A CN117889094A (en) | 2024-01-23 | 2024-01-23 | Compressor unit of small-flow compressed carbon dioxide energy storage system and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410093259.9A CN117889094A (en) | 2024-01-23 | 2024-01-23 | Compressor unit of small-flow compressed carbon dioxide energy storage system and operation method |
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- 2024-01-23 CN CN202410093259.9A patent/CN117889094A/en active Pending
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