A multifunctional carbon dioxide circulation test system

Abstract

The application discloses a multifunctional carbon dioxide cycle test system, which is composed of a buffer tank, a main compressor, a condenser, a pump, a re-compressor, a low-temperature regenerator, a high-temperature regenerator, an electric heater, a turbine, a pre-cooler and valves. Valves are arranged in front of and behind the main compressor, and valves are arranged in front of the condenser and behind the pump, so that supercritical cycle test and transcritical cycle test can be carried out. The main compressor and the re-compressor are arranged at the same time, the main compressor and the re-compressor can be operated at the same time to carry out combined test, the re-compressor is isolated, and simple regenerative cycle test can be carried out independently. The main compressor loop and the re-compressor loop are arranged, and the main compressor test and the re-compressor test can be carried out independently. The turbine is provided with a bypass pipeline and a valve, and the regenerator test can be carried out independently.

Description

Technical Field

[0001] This invention belongs to the field of energy power generation technology, and relates to a carbon dioxide cycle system, particularly a multifunctional carbon dioxide cycle test system. Background Technology

[0002] With the development of society and the economy, increasingly higher demands are being placed on the size and efficiency of power equipment. Various power equipment are developing towards higher temperatures, higher pressures, and higher speeds. Supercritical carbon dioxide power generation systems, a type of power system, use supercritical carbon dioxide as the working fluid to convert heat from a heat source into mechanical energy. The heat source can come from nuclear reactors, solar energy, geothermal energy, industrial waste heat, chemical fuel combustion, etc. The excellent properties of supercritical carbon dioxide as the working fluid give this system promising application prospects and research value. However, supercritical carbon dioxide cycles involve many key components, and constructing a supercritical carbon dioxide cycle test system requires high investment and a long construction time. Therefore, it is necessary to study a supercritical carbon dioxide cycle test system that can meet multiple experimental needs in a single construction phase. Summary of the Invention

[0003] (I) Technical Issues

[0004] In view of the above-mentioned defects and deficiencies of the existing technology, the present invention aims to provide a multifunctional carbon dioxide cycle test system, which has multiple functions and good applicability. It can carry out multiple tests such as supercritical cycle test, transcritical cycle test, supercritical and transcritical combined test, recompression cycle test alone, main compressor test, recompressor test, and regenerator test, and can meet a variety of test requirements.

[0005] (II) Technical Solution

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A multifunctional carbon dioxide cycle test system includes a buffer tank, a main compressor, a condenser, a pump, a re-compressor, a low-temperature regenerator, a high-temperature regenerator, an electric heater, a turbine, and a precooler, characterized in that...

[0008] The buffer tank stores supercritical carbon dioxide.

[0009] The buffer tank is provided with an inlet pipeline, an outlet pipeline I, an outlet pipeline II, and an outlet pipeline III. Each of the outlet pipelines I, II, and III is equipped with a valve I, a valve II, and a valve III, respectively. The inlet pipeline is connected to the outlet of the precooler, the outlet pipeline I is connected to the inlet of the main compressor, the outlet pipeline II is connected to the inlet of the pump via the condenser, and the outlet pipeline III is connected to the inlet of the recompressor.

[0010] The main compressor has an outlet pipeline IV and an outlet pipeline V. The outlet pipeline IV and outlet pipeline V are respectively equipped with valve IV and valve V. The outlet pipeline IV is connected to the inlet of the precooler, and the outlet pipeline V is connected to the cold side inlet of the low temperature regenerator.

[0011] The pump outlet is provided with an outlet pipeline VI, the outlet pipeline VI is provided with a valve VI, and the outlet pipeline VI is connected to the cold side inlet of the low temperature regenerator;

[0012] The outlet of the recompressor is provided with an outlet pipeline VII and an outlet pipeline VIII. The outlet pipeline VII and the outlet pipeline VIII are respectively provided with valve VII and valve VIII. The outlet pipeline VII is connected to the inlet of the precooler, and the outlet pipeline VIII is connected to the cold side inlet of the high temperature regenerator.

[0013] The hot-side outlet of the low-temperature regenerator is provided with an outlet pipeline IX and an outlet pipeline X. The outlet pipeline IX and the outlet pipeline X are respectively provided with valve IX and valve X. The outlet pipeline IX is connected to the inlet of the re-compressor, and the outlet pipeline X is connected to the inlet of the precooler.

[0014] The cold-side outlet of the low-temperature regenerator is connected to the inlet of the turbine via a pipeline that passes sequentially through the cold side of the high-temperature regenerator and the electric heater.

[0015] The turbine is equipped with valve XI at its inlet and valve XII at its outlet. The turbine outlet is connected to the hot side inlet of the low-temperature regenerator via a pipeline through the hot side of the high-temperature regenerator. A bypass pipeline is provided between the turbine inlet pipeline and the outlet pipeline, and valve XIII is provided on the bypass pipeline.

[0016] Preferably, the test system includes at least the following test modes: supercritical simple regenerative cycle test mode, supercritical recompression cycle test mode, transcritical simple regenerative cycle test mode, turbine performance test mode, transcritical recompression cycle test mode, supercritical and transcritical simple regenerative combined cycle test mode, supercritical and transcritical recompression combined cycle test mode, main compressor standalone test mode, pump standalone test mode, recompressor standalone test mode, and regenerator test mode.

[0017] Preferably, when the test system enters the supercritical simple regenerative cycle test mode, valves I, V, X, XI, and XII are opened, the remaining valves are closed, the pump and recompressor are isolated, and the main compressor and turbine are started. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the main compressor, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, thereby realizing the supercritical simple regenerative carbon dioxide cycle.

[0018] Preferably, when the test system enters the supercritical recompression cycle test mode, valves I, V, VIII, IX, X, XI, and XII are opened, the remaining valves are closed, the pump is isolated, and the main compressor, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank is introduced into the hot side of the low-temperature regenerator via pipelines through the main compressor, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thus realizing the supercritical recompression carbon dioxide cycle.

[0019] Preferably, when the test system enters the transcritical simple regenerative cycle test mode and the turbine performance test mode, valves II, VI, X, XI, and XII are opened, the remaining valves are closed, the main compressor and the re-compressor are isolated, and the pump and turbine are started. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, thereby realizing the transcritical simple regenerative carbon dioxide cycle and simultaneously conducting turbine performance tests.

[0020] Furthermore, when the test system enters the regenerator test mode, based on the transcritical simple regenerator cycle test mode, valves XI and XII are further closed, valve XIII is opened, and the other valves are kept open or closed. In addition to isolating the main compressor and the re-compressor, the turbine is further isolated, and only the pump is kept in the start-up state. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, thereby realizing the performance test of the low-temperature regenerator and the high-temperature regenerator.

[0021] Preferably, when the test system enters the transcritical recompression cycle test mode, valves II, VI, VIII, IX, X, XI, and XII are opened, the remaining valves are closed, the main compressor is isolated, and the pump, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank is introduced into the hot side of the low-temperature regenerator via pipelines through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thereby realizing the transcritical recompression carbon dioxide cycle.

[0022] Preferably, when the test system enters the supercritical and transcritical simple regenerative combined cycle test mode, valves I, II, V, VI, X, XI, and XII are opened, the remaining valves are closed, the recompressor is isolated, and the main compressor, pump, and turbine are started. The supercritical carbon dioxide stored in the buffer tank enters the cold side of the low-temperature regenerator through the main compressor and the condenser and pump, and then flows back to the buffer tank through pipelines sequentially through the cold side of the high-temperature regenerator, heater, turbine, hot side of the high-temperature regenerator, hot side of the low-temperature regenerator, and precooler, thus realizing a supercritical and transcritical carbon dioxide combined cycle without recompression.

[0023] Preferably, when the test system enters the supercritical and transcritical recompression combined cycle test mode, valves I, II, V, VI, VIII, IX, X, XI, and XII are opened, and the remaining valves are closed. The main compressor, pump, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank enters the cold side of the low-temperature regenerator through the main compressor and the condenser and pump, and then flows through pipelines sequentially through the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator before entering the hot side of the low-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thus realizing the supercritical and transcritical recompression carbon dioxide combined cycle.

[0024] Preferably, when the test system enters the main compressor standalone test mode, valves I and IV are opened, other valves are closed, and the main compressor is started independently. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the main compressor and precooler, thereby realizing the performance test of the main compressor.

[0025] Preferably, when the test system enters the pump stand-alone test mode, valves II, IV, V, and VI are opened, other valves are closed, and the pump is started independently. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the pump and the precooler, thereby realizing the performance test of the pump.

[0026] Preferably, when the test system enters the recompressor standalone test mode, valves III and VII are opened, other valves are closed, the recompressor is started independently, and the supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the recompressor and precooler, and the performance test of the recompressor is carried out independently.

[0027] (III) Technical Effects

[0028] Compared with the prior art, the supercritical carbon dioxide cycle test system of the present invention overcomes the shortcomings and deficiencies of the prior art. It can perform supercritical cycle tests and transcritical cycle tests, and can perform simple regenerative cycle and recompression cycle tests as well as combined tests. Furthermore, the test system of the present invention can also conduct performance tests on the main compressor, recompressor, pump, regenerator, turbine, etc., and has the advantages of multiple functions, good applicability, and the ability to meet various test requirements. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the multifunctional carbon dioxide cycle test system of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Buffer tank; 2-Main compressor; 3-Condenser; 4-Pump; 5-Recompressor; 6-Low-temperature regenerator; 7-High-temperature regenerator; 8-Electric heater; 9-Turbine; 10-Precooler; 11-23-Valve I-XIII. Detailed Implementation

[0032] To better understand the present invention, the following embodiments further illustrate the content of the invention, so that the advantages and features of the invention can be more easily understood by those skilled in the art. It should be noted that the following descriptions are merely preferred embodiments of the present invention, but the content of the invention is not limited to the following embodiments. In fact, various modifications and variations can be made to the present invention without departing from the scope or spirit of the invention, which will be apparent to those skilled in the art. For example, features shown or described as part of one embodiment can be used with another embodiment to produce yet another embodiment. Therefore, it is intended that such modifications and variations be included within the scope of the appended claims and their equivalents.

[0033] like Figure 1As shown, the multifunctional carbon dioxide cycle test system of the present invention includes a buffer tank 1, a main compressor 2, a condenser 3, a pump 4, a re-compressor 5, a low-temperature regenerator 6, a high-temperature regenerator 7, an electric heater 8, a turbine 9, and a precooler 10. The main compressor 2 is a centrifugal compressor, an axial compressor, or other type of compressor, and the pump 4 is a plunger pump or other type of liquid pump.

[0034] Buffer tank 1 stores supercritical carbon dioxide; buffer tank 1 is equipped with an inlet pipeline, an outlet pipeline I, an outlet pipeline II and an outlet pipeline III, and outlet pipeline I, outlet pipeline II and outlet pipeline III are respectively equipped with valve I11, valve II12 and valve III13. The inlet pipeline is connected to the outlet of the precooler 10, outlet pipeline I is connected to the inlet of the main compressor 2, outlet pipeline II is connected to the inlet of the pump 4 through a condenser 3, and outlet pipeline III is connected to the inlet of the recompressor 5. The main compressor 2 has an outlet pipeline IV and an outlet pipeline V. Valves IV14 and V15 are installed on outlet pipelines IV and V, respectively. Outlet pipeline IV is connected to the inlet of precooler 10, and outlet pipeline V is connected to the cold-side inlet of low-temperature regenerator 6. The pump 4 has an outlet pipeline VI, with valve VI16 installed on it. Outlet pipeline VI is connected to the cold-side inlet of low-temperature regenerator 6. The recompressor 5 has an outlet pipeline VII and an outlet pipeline VIII, with valves VII17 and VIII18 installed on them, respectively. Outlet pipeline VII is connected to the inlet of precooler 10, and outlet pipeline VIII is connected to the cold-side inlet of high-temperature regenerator 7. The hot side outlet of the heat exchanger 6 is provided with an outlet pipeline IX and an outlet pipeline X. Valves IX19 and X20 are respectively installed on outlet pipeline IX and outlet pipeline X. Outlet pipeline IX is connected to the inlet of the recompressor 5, and outlet pipeline X is connected to the inlet of the precooler 10. The cold side outlet of the low-temperature regenerator 6 is connected to the inlet of the turbine 9 via pipelines through the cold side of the high-temperature regenerator 7 and the electric heater 8. The turbine 9 is provided with valve XI21 at the inlet and valve XII22 at the outlet. The outlet of the turbine 9 is connected to the hot side inlet of the low-temperature regenerator 6 via pipelines through the hot side of the high-temperature regenerator 7. A bypass pipeline is provided between the inlet pipeline and the outlet pipeline of the turbine 9, and valve XIII23 is installed on the bypass pipeline.

[0035] The above-mentioned test system of the present invention includes at least the following test modes: supercritical simple regenerative cycle test mode, supercritical recompression cycle test mode, transcritical simple regenerative cycle test mode, turbine performance test mode, transcritical recompression cycle test mode, supercritical and transcritical simple regenerative combined cycle test mode, supercritical and transcritical recompression combined cycle test mode, main compressor standalone test mode, pump standalone test mode, recompressor standalone test mode, and regenerator test mode.

[0036] When the test system enters the supercritical simple regenerative cycle test mode, valves I11, V15, X20, XI21, and XII2 are opened, and the remaining valves are closed. Pump 4 and compressor 5 are isolated, and main compressor 2 and turbine 9 are started. The supercritical carbon dioxide stored in buffer tank 1 flows back to buffer tank 1 through pipelines via main compressor 2, the cold side of low-temperature regenerator 6, the cold side of high-temperature regenerator 7, heater 8, turbine 9, the hot side of high-temperature regenerator 7, the hot side of low-temperature regenerator 6, and precooler 10, thus realizing the supercritical simple regenerative carbon dioxide cycle.

[0037] When the test system enters the supercritical recompression cycle test mode, open valves I11, V15, VIII18, IX19, X20, XI21, and XII2, close the remaining valves, isolate pump 4, and start the main compressor 2, recompressor 5, and turbine 9. The supercritical carbon dioxide stored in buffer tank 1 is introduced into the hot side of low-temperature recompressor 6 through pipelines via the main compressor 2, the cold side of low-temperature regenerator 6, the cold side of high-temperature regenerator 7, heater 8, turbine 9, and the hot side of high-temperature regenerator 7. The hot side outlet of low-temperature regenerator 6 is divided into two paths: one path flows back to buffer tank 1 after passing through precooler 10, and the other path flows into the cold side of high-temperature regenerator 7 after passing through recompressor 5, thus realizing the supercritical recompression cycle.

[0038] When the test system enters the transcritical simple regenerative cycle test mode and the turbine performance test mode, valves II12, VI16, X20, XI21, and XII2 are opened, and the remaining valves are closed. The main compressor 2 and the recompressor 5 are isolated, and pump 4 and turbine 9 are started. The supercritical carbon dioxide stored in buffer tank 1 flows back to buffer tank 1 through pipelines via pump 4, the cold side of low-temperature regenerator 6, the cold side of high-temperature regenerator 7, heater 8, turbine 9, the hot side of high-temperature regenerator 7, the hot side of low-temperature regenerator 6, and precooler 10, realizing the transcritical simple regenerative carbon dioxide cycle, and turbine performance test can be carried out at the same time.

[0039] When the test system enters the regenerator test mode, based on the transcritical simple regenerator cycle test mode, valves XI21 and XII2 are further closed, valve XIII23 is opened, and the other valves are kept open or closed. Based on isolating the main compressor 2 and the re-compressor 5, turbine 9 is further isolated, and only pump 4 is kept in the start-up state. The supercritical carbon dioxide stored in buffer tank 1 flows back to buffer tank 1 through pipelines via pump 4, the cold side of low-temperature regenerator 6, the cold side of high-temperature regenerator 7, heater 8, the hot side of high-temperature regenerator 7, the hot side of low-temperature regenerator 6, and precooler 10, thereby realizing the performance test of low-temperature regenerator 6 and high-temperature regenerator 7.

[0040] When the test system enters the transcritical recompression cycle test mode, valves II12, VI16, VIII18, IX19, X20, XI21, and XII2 are opened, and the remaining valves are closed. The main compressor 2 is isolated, and pump 4, recompressor 5, and turbine 9 are started. The supercritical carbon dioxide stored in buffer tank 1 is introduced into the hot side of low-temperature recompressor 6 through pipelines via pump 4, the cold side of low-temperature regenerator 6, the cold side of high-temperature regenerator 7, heater 8, turbine 9, and the hot side of high-temperature regenerator 7. The hot side outlet of low-temperature regenerator 6 is divided into two paths: one path flows back to buffer tank 1 after passing through precooler 10, and the other path flows into the cold side of high-temperature regenerator 7 after passing through recompressor 5, thus realizing the transcritical recompression cycle.

[0041] When the test system enters the supercritical and transcritical simple regenerative combined cycle test mode, valves I11, II12, V15, VI16, X20, XI21, and XII2 are opened, and the remaining valves are closed. The recompressor 5 is isolated, and the main compressor 2, pump 4, and turbine 9 are started. The supercritical carbon dioxide stored in the buffer tank 1 enters the cold side of the low-temperature regenerator 6 through the main compressor 2 and the condenser 3 and pump 4. Then, it flows back to the buffer tank 1 through pipelines through the cold side of the high-temperature regenerator 7, heater 8, turbine 9, hot side of the high-temperature regenerator 7, hot side of the low-temperature regenerator 6, and precooler 10, thus realizing a supercritical and transcritical carbon dioxide combined cycle without recompression.

[0042] When the test system enters the supercritical and transcritical recompression combined cycle test mode, valves I11, II12, V15, VI16, VIII18, IX19, X20, XI21, and XII2 are opened, and the remaining valves are closed. The main compressor 2, pump 4, recompressor 5, and turbine 9 are started. The supercritical carbon dioxide stored in buffer tank 1 enters the cold side of the low-temperature regenerator 6 through the main compressor 2 and the condenser 3 and pump 4. Then, it passes through the pipeline sequentially through the cold side of the high-temperature regenerator 7, heater 8, turbine 9, and the hot side of the high-temperature regenerator 7 before entering the hot side of the low-temperature regenerator 6. The hot side outlet of the low-temperature regenerator 6 is divided into two paths: one path flows back to buffer tank 1 after passing through precooler 10, and the other path flows into the cold side of high-temperature regenerator 7 after passing through recompressor 5, thus realizing the supercritical and transcritical combined cycle.

[0043] When the test system enters the main compressor stand-alone test mode, valve I11 and valve IV14 are opened, other valves are closed, and the main compressor 2 is started independently. The supercritical carbon dioxide stored in buffer tank 1 flows back to buffer tank 1 through the main compressor 2 and precooler 10 to realize the performance test of the main compressor 2.

[0044] When the test system enters the pump stand-alone test mode, open valves II12, IV14, V15, and VI16, close other valves, and start pump 4 alone. The supercritical carbon dioxide stored in buffer tank 1 flows back to buffer tank 1 through pump 4 and precooler 10, thus realizing the performance test of pump 4.

[0045] When the test system enters the recompressor standalone test mode, open valves III13 and VII17, close other valves, start the recompressor 5 separately, and the supercritical carbon dioxide in the buffer tank 1 flows back to the buffer tank 1 through the recompressor 5 and the precooler 10 to carry out the performance test of the recompressor 5 separately.

[0046] The objectives of this invention have been fully and effectively achieved through the above embodiments. All equivalent or simple variations made to the structures, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this invention or exceed the scope defined in these claims, all of which should fall within the protection scope of this invention.

Claims

1. A multifunctional carbon dioxide cycle test system, comprising a buffer tank, a main compressor, a condenser, a pump, a re-compressor, a low-temperature regenerator, a high-temperature regenerator, an electric heater, a turbine, and a precooler, characterized in that, The buffer tank stores supercritical carbon dioxide. The buffer tank is provided with an inlet pipeline, an outlet pipeline I, an outlet pipeline II, and an outlet pipeline III. Each of the outlet pipelines I, II, and III is equipped with a valve I, a valve II, and a valve III, respectively. The inlet pipeline is connected to the outlet of the precooler, the outlet pipeline I is connected to the inlet of the main compressor, the outlet pipeline II is connected to the inlet of the pump through the condenser, and the outlet pipeline III is connected to the inlet of the recompressor. The main compressor has an outlet pipeline IV and an outlet pipeline V. The outlet pipeline IV and outlet pipeline V are respectively equipped with valve IV and valve V. The outlet pipeline IV is connected to the inlet of the precooler, and the outlet pipeline V is connected to the cold side inlet of the low temperature regenerator. The pump outlet is provided with an outlet pipeline VI, the outlet pipeline VI is provided with a valve VI, and the outlet pipeline VI is connected to the cold side inlet of the low temperature regenerator; The outlet of the recompressor is provided with an outlet pipeline VII and an outlet pipeline VIII. The outlet pipeline VII and the outlet pipeline VIII are respectively provided with valve VII and valve VIII. The outlet pipeline VII is connected to the inlet of the precooler, and the outlet pipeline VIII is connected to the cold side inlet of the high temperature regenerator. The hot-side outlet of the low-temperature regenerator is provided with an outlet pipeline IX and an outlet pipeline X. The outlet pipeline IX and the outlet pipeline X are respectively provided with valve IX and valve X. The outlet pipeline IX is connected to the inlet of the re-compressor, and the outlet pipeline X is connected to the inlet of the precooler. The cold-side outlet of the low-temperature regenerator is connected to the inlet of the turbine via a pipeline that passes sequentially through the cold side of the high-temperature regenerator and the electric heater. The turbine is equipped with valve XI at its inlet and valve XII at its outlet. The turbine outlet is connected to the hot side inlet of the low-temperature regenerator via a pipeline through the hot side of the high-temperature regenerator. A bypass pipeline is provided between the turbine inlet pipeline and the outlet pipeline, and valve XIII is provided on the bypass pipeline.

2. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, The test system includes at least the following test modes: supercritical simple regenerative cycle test mode, supercritical recompression cycle test mode, transcritical simple regenerative cycle test mode, turbine performance test mode, transcritical recompression cycle test mode, supercritical and transcritical simple regenerative combined cycle test mode, supercritical and transcritical recompression combined cycle test mode, main compressor standalone test mode, pump standalone test mode, recompressor standalone test mode, and regenerator test mode.

3. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the supercritical simple regenerative cycle test mode, valves I, V, X, XI, and XII are opened, the remaining valves are closed, the pump and recompressor are isolated, and the main compressor and turbine are started. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the main compressor, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, thus realizing the supercritical simple regenerative carbon dioxide cycle.

4. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the supercritical recompression cycle test mode, valves I, V, VIII, IX, X, XI, and XII are opened, the remaining valves are closed, the pump is isolated, and the main compressor, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank is introduced into the hot side of the low-temperature regenerator via pipelines through the main compressor, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thus realizing the supercritical recompression carbon dioxide cycle.

5. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the transcritical simple regenerative cycle test mode and the turbine performance test mode, valves II, VI, X, XI, and XII are opened, the remaining valves are closed, the main compressor and the re-compressor are isolated, and the pump and turbine are started. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, realizing the transcritical simple regenerative carbon dioxide cycle, and the turbine performance test can be carried out simultaneously.

6. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the regenerator test mode, based on the transcritical simple regenerator cycle test mode, valves XI and XII are further closed, valve XIII is opened, and the other valves are kept open or closed. In addition to isolating the main compressor and the re-compressor, the turbine is further isolated, and only the pump is kept in the start state. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank through pipelines sequentially through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the hot side of the high-temperature regenerator, the hot side of the low-temperature regenerator, and the precooler, thereby realizing the performance test of the low-temperature regenerator and the high-temperature regenerator.

7. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the transcritical recompression cycle test mode, valves II, VI, VIII, IX, X, XI, and XII are opened, and the remaining valves are closed to isolate the main compressor. The pump, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank is introduced into the hot side of the low-temperature regenerator via pipelines through the pump, the cold side of the low-temperature regenerator, the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thus realizing the transcritical recompression carbon dioxide cycle.

8. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the supercritical and transcritical simple regenerative combined cycle test mode, valves I, II, V, VI, X, XI, and XII are opened, the remaining valves are closed, the recompressor is isolated, and the main compressor, pump, and turbine are started. The supercritical carbon dioxide stored in the buffer tank enters the cold side of the low-temperature regenerator through the main compressor and the condenser and pump, and then flows back to the buffer tank through pipelines in sequence through the cold side of the high-temperature regenerator, heater, turbine, hot side of the high-temperature regenerator, hot side of the low-temperature regenerator, and precooler, thus realizing a supercritical and transcritical carbon dioxide combined cycle without recompression.

9. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the supercritical and transcritical recompression combined cycle test mode, valves I, II, V, VI, VIII, IX, X, XI, and XII are opened, and the remaining valves are closed. The main compressor, pump, recompressor, and turbine are started. The supercritical carbon dioxide stored in the buffer tank enters the cold side of the low-temperature regenerator through the main compressor and the condenser and pump. Then, it passes through the cold side of the high-temperature regenerator, the heater, the turbine, and the hot side of the high-temperature regenerator in sequence, and finally enters the hot side of the low-temperature regenerator. The hot side outlet of the low-temperature regenerator is divided into two paths: one path flows back to the buffer tank after passing through the precooler, and the other path flows into the cold side of the high-temperature regenerator after passing through the recompressor, thus realizing the supercritical and transcritical recompression carbon dioxide combined cycle.

10. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the main compressor stand-alone test mode, valves I and IV are opened, other valves are closed, and the main compressor is started independently. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the main compressor and precooler, thereby realizing the performance test of the main compressor.

11. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the pump stand-alone test mode, valves II, IV, V, and VI are opened, and other valves are closed. The pump is started independently, and the supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the pump and the precooler, thus realizing the pump performance test.

12. The multifunctional carbon dioxide cycle test system according to claim 1, characterized in that, When the test system enters the recompressor standalone test mode, valves III and VII are opened, other valves are closed, and the recompressor is started independently. The supercritical carbon dioxide stored in the buffer tank flows back to the buffer tank after passing through the recompressor and precooler, and the performance test of the recompressor is carried out independently.

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