High-efficiency and compact heat exchanger performance experimental platform and method for water-carbon dioxide heat exchange

Abstract

The invention discloses an efficient and compact heat exchanger performance test platform and method for water-carbon dioxide heat exchange, which belongs to the technical field of research on new power conversion technology, including a cooler test body, and also including a first loop system and a second loop system which are respectively arranged on the high temperature side and the low temperature side of the cooler test body, wherein the working fluid in the first loop system is supercritical carbon dioxide, and the working fluid in the second loop system is a cooling medium, and the first loop system and the second loop system are respectively provided with a first regulator and a second regulator for stabilizing the pressure of the medium; and also includes a boiler, wherein a carbon dioxide heat exchange tube and a cooling medium heat exchange tube are arranged in the boiler, and the carbon dioxide heat exchange tube and the cooling medium heat exchange tube are respectively connected to the first loop system and the second loop system, so as to verify the cooler design method and the accessibility of the performance index, obtain the operating characteristics of the supercritical carbon dioxide cooler, and effectively accelerate the research and development process of the supercritical carbon dioxide cooler.

Description

Technical Field

[0001] The present invention belongs to the technical field of research on new power conversion technology, and relates to realizing a performance test of a supercritical carbon dioxide cooler, and specifically, to a high-efficiency and compact heat exchanger performance test platform and method for water-carbon dioxide heat exchange. Background Art

[0002] Supercritical carbon dioxide power conversion technology has the technical advantages of simplified system and high efficiency. It is a new power conversion technology with good application prospects. The cooler is the core equipment of the supercritical carbon dioxide power conversion system. The device is a new type of heat exchanger based on photochemical etching and diffusion welding technology. The high and low temperature sides of the cooler are supercritical carbon dioxide and cooling medium respectively. The reliability of the cooler design method and the accessibility of performance indicators, as well as the equipment operation characteristics, all need to be experimentally tested. However, the power scale of the existing cooler test equipment is very small, and it usually does not have the ability to carry out countercurrent and cocurrent cooler tests at the same time. The carbon dioxide circuit may be contaminated by lubricating oil impurities or regulator stabilizing gas impurities, and the test circuit cooling water temperature adjustment range is small.

[0003] In view of this, the present invention proposes a supercritical carbon dioxide-supercritical carbon dioxide regenerator performance test platform and method, which can cover different high and low power scale requirements, and at the same time has the ability to carry out countercurrent and cocurrent cooler tests, and has the ability to adjust the cooling medium inlet temperature over a wide parameter range, and the carbon dioxide circuit is free of lubricating oil impurities or stabilizer gas impurities contamination. Summary of the invention

[0004] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a high-efficiency and compact heat exchanger performance experimental platform and method for water-carbon dioxide heat exchange so as to verify the cooler design method and the accessibility of performance indicators, obtain the operating characteristics of the supercritical carbon dioxide cooler, and effectively accelerate the research and development process of the supercritical carbon dioxide cooler.

[0005] The technical solution adopted by the present invention is: a high-efficiency and compact heat exchanger performance experimental platform for water-carbon dioxide heat exchange, including a cooler experimental body, and also including a first loop system and a second loop system, which are respectively arranged on the high-temperature side and the low-temperature side of the cooler experimental body, the working fluid in the first loop system is supercritical carbon dioxide, the working fluid in the second loop system is a cooling medium, and the first loop system and the second loop system are respectively provided with a first stabilizer and a second stabilizer for stabilizing the pressure of the medium; and also including a boiler, the boiler is provided with a carbon dioxide heat exchange pipe and a cooling medium heat exchange pipe, and the carbon dioxide heat exchange pipe and the cooling medium heat exchange pipe are respectively connected to the first loop system and the second loop system.

[0006] Furthermore, the first circuit system includes a common series pipeline, which is connected in series with the high-temperature side of the cooler experimental body to form a downstream circuit or a reverse circuit, and both the downstream circuit and the reverse circuit are connected to the first regulator.

[0007] Furthermore, the common series pipeline includes a first pump, a second regulating valve and a carbon dioxide heat exchange tube connected in series in sequence, the outlet end of the carbon dioxide heat exchange tube is connected to the two ends of the high-temperature side of the cooler experimental body through a first stop valve and a third stop valve, and the inlet end of the first pump is connected to the two ends of the high-temperature side of the cooler experimental body through a second stop valve and a fourth stop valve.

[0008] Furthermore, a first regulating pipeline is provided between the inlet and outlet of the first pump, and a first regulating valve is provided on the first regulating pipeline.

[0009] Furthermore, the first pump is driven by a diaphragm pump, and the first pressure regulator is filled with carbon dioxide.

[0010] Furthermore, the first pressure stabilizer comprises a pressure-bearing shell and an electric heating element. The pressure-bearing shell contains a sealed cavity and the electric heating element extends into the sealed cavity. The sealed cavity is communicated with the inlet end of the first pump.

[0011] Furthermore, the second circuit system includes a mixer, a pump cooler and a second pump. The mixer, the low-temperature side of the cooler experimental body, the pump cooler, the second pump and the cooling medium heat exchange pipe are connected in series to form a circuit, and the hot side inlet and outlet of the mixer are respectively connected to the cooling medium heat exchange pipe and the low-temperature side of the cooler experimental body; the outlet end of the second pump is respectively connected to the cold side inlet of the mixer and the cooling medium heat exchange pipe through the fourth regulating valve and the fifth regulating valve.

[0012] Furthermore, a second regulating pipeline is provided between the inlet and outlet of the second pump, and a third regulating valve is provided on the second regulating pipeline.

[0013] Furthermore, the outlet end of the second pump is connected to a second pressure stabilizer, and the second pressure stabilizer is filled with a pressure stabilizing medium, and the pressure stabilizing medium is set to be nitrogen or helium.

[0014] The present invention also provides a method for testing the performance of a water-carbon dioxide heat exchanger with a high efficiency and compact heat exchanger. The method is applied to the above-mentioned water-carbon dioxide heat exchange with a high efficiency and compact heat exchanger performance testing platform. The method comprises:

[0015] (1) using high-purity carbon dioxide to purge the first loop system, detecting the purity of carbon dioxide in the first loop system, and when the purity of carbon dioxide reaches a predetermined value, continuously injecting carbon dioxide into the first loop system until the loop pressure reaches a predetermined value;

[0016] (2) Adjust the first regulator of the first loop system to keep the pressure stable;

[0017] (3) starting and adjusting the first loop system so that the flow rate of carbon dioxide entering the boiler reaches a predetermined value;

[0018] (4) adjusting the second regulator of the second loop system so that the pressure of the second loop system reaches the target value;

[0019] (5) Start and adjust the second loop system so that the flow rate of cooling medium entering the boiler reaches a predetermined value;

[0020] (6) Starting the boiler and adjusting the outlet temperature of the carbon dioxide in the first loop system and the cooling medium in the second loop system;

[0021] (7) arranging a mixer in the second loop system, and adjusting the cold side inlet flow and the hot side inlet flow of the mixer in the second loop system so that the inlet temperature of the cooling medium on the low temperature side of the cooler experimental body reaches a predetermined value;

[0022] (8) When the main thermal parameters reach the control targets, carry out relevant tests.

[0023] The beneficial effects of the present invention are:

[0024] 1. The efficient and compact heat exchanger performance experimental platform and method for water-carbon dioxide heat exchange provided by the present invention are used. A boiler is used for heating in the system, an isolation pump is used to drive the carbon dioxide fluid, a carbon dioxide flow direction control pipeline is set, a mixer is set to adjust the inlet temperature of the cooling medium of the cooler, and different regulators are used to regulate the voltage for different loop systems, so that it can cover different power scale requirements, and at the same time, it has the ability to carry out countercurrent and cocurrent cooler tests, and has the ability to adjust the cooling medium inlet temperature over a wide parameter range. The carbon dioxide loop is free of lubricating oil impurities or regulator stabilizing gas impurities pollution, and can carry out performance tests of water-supercritical carbon dioxide coolers with different power scales, different flow conditions, and a wide cooling medium temperature range, and verify the design method of the cooler and the accessibility of performance indicators, which is of great significance to promoting the engineering application of supercritical carbon dioxide Brayton cycle power conversion technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the high-efficiency and compact heat exchanger performance experimental platform for water-carbon dioxide heat exchange provided by the present invention;

[0026] Figure 2 It is a structural schematic diagram of the first stabilizer in the high-efficiency and compact heat exchanger performance experimental platform for water-carbon dioxide heat exchange provided by the present invention;

[0027] Figure 3 It is a schematic structural diagram of the second stabilizer in the high-efficiency and compact heat exchanger performance experimental platform for water-carbon dioxide heat exchange provided by the present invention;

[0028] The following are marked in the attached figure:

[0029] 1-first pump, 2-first regulating valve, 3-second regulating valve, 4-boiler, 5-first pressure regulator, 6-cooler experimental body, 7-second pump, 8-third regulating valve, 9-second pressure regulator, 10-fourth regulating valve, 11-fifth regulating valve, 12-mixer, 13-pump cooler, 14-first stop valve, 15-second stop valve, 16-third stop valve, 17-fourth stop valve, 18-pressure shell, 19-electric heating element, 20-inlet and outlet water pipes. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Example 1

[0037] like Figure 1As shown, in this embodiment, a high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange is provided to carry out performance tests of water-supercritical carbon dioxide coolers in different power scales, different flow conditions, and a wide range of cooling medium temperatures. It also includes a first loop system and a second loop system, which are respectively arranged on the high-temperature side and the low-temperature side of the cooler experimental body 6, that is, the high-temperature side of the cooler experimental body 6 is connected in series to the loop where the first loop system is located, and the low-temperature side of the cooler experimental body 6 is connected in series to the loop where the second loop system is located. The working fluid in the first loop system is supercritical carbon dioxide, and the working fluid in the second loop system is a cooling medium. In this embodiment, the cooling medium is cooling water, and the first loop system and the second loop system are respectively provided with a first pressurizer 5 and a second pressurizer 9 for stabilizing the pressure of the medium, so that the carbon dioxide in the loop where the first loop system is located is stabilized by the first pressurizer 5, and the cooling medium in the loop where the second loop system is located is stabilized by the second pressurizer 9. In the performance test of the cooler experimental body 6, it is necessary to heat the working medium, and a boiler 4 is also included. The boiler 4 is provided with a carbon dioxide heat exchange tube and a cooling medium heat exchange tube, and the carbon dioxide heat exchange tube and the cooling medium heat exchange tube are respectively connected to the first loop system and the second loop system. The carbon dioxide heat exchange tube and the cooling medium heat exchange tube are heated by the boiler 4 at the same time, thereby heating the carbon dioxide and the cooling water. In this embodiment, the boiler 4 includes a combustion chamber, and the carbon dioxide heat exchange tube and the cooling medium heat exchange tube are arranged in the combustion chamber, and liquefied gas is used for heating. Since liquefied gas is used for heating, the carbon dioxide heat exchange tube and the cooling medium heat exchange tube can be heated with a greater power.

[0038] In the above, the first circuit system includes a common series pipeline, which is connected in series with the high temperature side of the cooler test body to form a downstream circuit or a countercurrent circuit, that is, the first circuit system is switched to a downstream circuit or a countercurrent circuit by the opening and closing of each stop valve, so as to perform a downstream working condition test and a countercurrent working condition test on the cooler test body by switching between the downstream circuit and the countercurrent circuit. The first pressure regulator 5 is connected in both the downstream circuit and the countercurrent circuit to achieve that the first pressure regulator 5 can stabilize the carbon dioxide in the downstream circuit and the countercurrent circuit in both the downstream working condition test and the countercurrent working condition test to ensure the smooth progress of the test. The common series pipeline includes a first pump 1, a second regulating valve 3 and a carbon dioxide heat exchange pipe connected in series in sequence, and the outlet end of the carbon dioxide heat exchange pipe is respectively connected to the two ends of the high temperature side of the cooler test body through the first stop valve 14 and the third stop valve 16, and the inlet end of the first pump 1 is respectively connected to the two ends of the high temperature side of the cooler test body 6 through the second stop valve 15 and the fourth stop valve 17. A first regulating pipeline is provided between the inlet and outlet of the first pump 1, and a first regulating valve 2 is provided on the first regulating pipeline, and the flow rate in the first loop system is regulated by the first regulating valve 2. In the implementation and application process, the first pump is driven by a diaphragm pump, and only carbon dioxide is filled in the first regulator. The use of a diaphragm pump solves the problem of lubricating oil impurities after long-term operation of a conventional plunger pump, and only carbon dioxide is filled in the first regulator 5, avoiding the problem of nitrogen entering the first loop system and contaminating carbon dioxide gas.

[0039] In actual application, the first stop valve 14, the second stop valve 15, the third stop valve 16 and the fourth stop valve 17 are arranged in the first loop system, and the four stop valves can be used to cooperate with each other to realize the cooler experiment under the downstream and reverse flow conditions. When the first stop valve 14 and the second stop valve 15 are closed, and the third stop valve 16 and the fourth stop valve 17 are opened, the cooler experiment body can perform the reverse flow condition experiment, that is, the fluid flow direction of the high temperature side and the low temperature side of the cooler experiment body is opposite; when the first stop valve 14 and the second stop valve 15 are opened, and the third stop valve 16 and the fourth stop valve 17 are closed, the cooler experiment body performs the downstream condition experiment, that is, the fluid flow direction of the high temperature side and the low temperature side of the cooler experiment body is the same. By cooperating with four stop valves to transform the structure of the first loop system, the carbon dioxide in the first loop system can flow in from the left side of the high-temperature side of the cooler experimental body and out from the right side (i.e. countercurrent condition), and can also flow in from the right side of the high-temperature side of the cooler experimental body and out from the left side (i.e. cocurrent condition). That is, the experimental platform can carry out high-efficiency and compact heat exchanger performance experiments in cocurrent and countercurrent forms.

[0040] In order to stabilize the pressure of carbon dioxide in the loop of the first loop system, Figure 2As shown, the design is as follows: the first stabilizer 5 includes a pressure-bearing shell 11 and an electric heating element 13, the pressure-bearing shell 11 has a sealed cavity and the electric heating element 13 extends into the sealed cavity, and the electric heating element 13 is used to heat the supercritical carbon dioxide in the sealed cavity to stabilize the pressure through the effect of heating the supercritical carbon dioxide.

[0041] In the above, the second loop system includes a mixer 12, a pump cooler 13 and a second pump 7. The mixer 12 is provided with a hot side inlet, a cold side inlet and an outlet. The mixer 12, the low temperature side of the cooler experimental body 6, the pump cooler 13, the second pump 7 and the cooling medium heat exchange pipe are connected in series to form a loop, and the hot side inlet and outlet of the mixer 12 are respectively connected to the cooling medium heat exchange pipe and the low temperature side of the cooler experimental body 6; the outlet of the second pump 7 is respectively connected to the cold side inlet and the cooling medium heat exchange pipe of the mixer 12 through the fourth regulating valve 10 and the fifth regulating valve 11, and the flow of the cold side inlet and the hot side inlet in the mixer is adjusted by the fourth regulating valve 10 and the fifth regulating valve 11, and then the outlet temperature of the mixer 13 is adjusted to achieve the temperature regulation of the cooling water at the low temperature side inlet of the cooler experimental body 6. In the actual application process, cooling water is used as the cooling medium, and a second regulating pipeline is provided between the inlet and outlet of the second pump 7 and a third regulating valve 8 is provided on the second regulating pipeline, so that the flow in the second loop system is regulated by the third regulating valve 8.

[0042] like Figure 3 As shown, in order to realize the cooling water in the loop of the second circuit system, the second pressure stabilizer 9 also includes a pressure shell, and the bottom of the pressure shell is provided with a water inlet and outlet pipe 20, and the pressure shell is filled with a pressure-stabilizing medium. In actual application, the pressure-stabilizing medium is set to nitrogen or helium, and the pressure of the cooling water in the loop of the second circuit system is adjusted by the pressure of the nitrogen or helium.

[0043] Example 2

[0044] On the basis of Example 1, in order to realize the performance test of water-supercritical carbon dioxide coolers with different power scales, different flow conditions and wide cooling medium temperature range, the performance test of supercritical carbon dioxide cooler experimental body 6 is carried out by the following method, which specifically includes the following steps:

[0045] (1) using high-purity carbon dioxide to purge the loop where the first loop system is located, and using a trace gas concentration detector to detect the purity of carbon dioxide in the first loop system. When the purity of carbon dioxide reaches a predetermined value (such as 99.95%), carbon dioxide is continuously injected into the loop where the first loop system is located until the pressure of the loop reaches a predetermined value;

[0046] (2) adjusting the first regulator 5 where the first loop system is located to maintain a stable pressure; specifically, adjusting the heating power of the electric heating element 19 to ensure a stable pressure of carbon dioxide in the loop where the first loop system is located;

[0047] (3) A first pump 1 and a second regulating valve 3 are connected in series in the loop of the first loop system, and a first regulating valve 2 is connected between the inlet and outlet ends of the first pump 1. The first pump 1 is started to reach a predetermined working frequency, and the flow rate of carbon dioxide in the first loop system is adjusted by the first regulating valve 2 and the second regulating valve 3, so that the flow rate of carbon dioxide entering the boiler 4 reaches a predetermined value;

[0048] a) If a countercurrent working condition experiment is required for the cooler test body (i.e., the fluid flow directions in the high temperature side and the low temperature side of the cooler test body are opposite), the first stop valve 14 and the second stop valve 15 are closed, and the third stop valve 16 and the fourth stop valve 17 are opened;

[0049] b) If a downstream working condition experiment is required for the cooler test body (i.e., the fluid flow direction in the high temperature side and the low temperature side of the cooler test body is the same), the first stop valve 14 and the second stop valve 15 are opened, and the third stop valve 16 and the fourth stop valve 17 are closed;

[0050] (4) adjusting the second pressurizer 9 where the second loop system is located so that the pressure of the second loop system reaches the target value; specifically, injecting helium or nitrogen into the second pressurizer 9 so that the pressure of the loop where the second loop system is located reaches the target value under the pressure of the helium or nitrogen;

[0051] (5) A second pump 7 is connected in series in the loop of the second loop system, and a third regulating valve 8 is connected between the inlet and outlet ends of the second pump 7. The second pump 7 is started to reach a predetermined working frequency, and the flow rate of the cooling medium in the loop of the second loop system is adjusted by the third regulating valve 8 so that the flow rate of the cooling medium entering the boiler 4 reaches a predetermined value;

[0052] (6) Starting the boiler 4 and heating it with liquefied gas, and adjusting the boiler 4 to control the outlet temperature of the carbon dioxide in the first loop system and the cooling medium in the second loop system;

[0053] (7) Further adjusting the fourth regulating valve 10 and the fifth regulating valve 11 so that the cooling water inlet temperature of the cooler experimental body 6 on the low temperature side reaches the experimental predetermined value;

[0054] (8) When the main thermal parameters reach the control targets, carry out relevant tests.

[0055] This experimental method can be used to carry out performance tests of water-supercritical carbon dioxide regenerators with different power scales, different flow conditions, and a wide cooling medium temperature range, operating above the critical point of carbon dioxide.

[0056] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange, including a cooler test body, characterized in that: It also includes a first loop system and a second loop system, which are respectively arranged on the high temperature side and the low temperature side of the cooler experimental body, wherein the working medium in the first loop system is supercritical carbon dioxide, and the working medium in the second loop system is a cooling medium, and the first loop system and the second loop system are respectively provided with a first stabilizer and a second stabilizer for stabilizing the pressure of the medium; it also includes a boiler, wherein the boiler is provided with a carbon dioxide heat exchange pipe and a cooling medium heat exchange pipe, and the carbon dioxide heat exchange pipe and the cooling medium heat exchange pipe are respectively connected to the first loop system and the second loop system; The first circuit system includes a common series pipeline, the common series pipeline is connected in series with the high temperature side of the cooler experimental body to form a downstream loop or a reverse loop, and the downstream loop and the reverse loop are both connected to the first regulator; The common series pipeline includes a first pump, a second regulating valve and a carbon dioxide heat exchange pipe which are connected in series in sequence. The outlet end of the carbon dioxide heat exchange pipe is connected to the two ends of the high temperature side of the cooler experimental body through a first stop valve and a third stop valve, respectively. The inlet end of the first pump is connected to the two ends of the high temperature side of the cooler experimental body through a second stop valve and a fourth stop valve, respectively.

2. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 1 is characterized in that: A first regulating pipeline is provided between the inlet end and the outlet end of the first pump, and a first regulating valve is provided on the first regulating pipeline.

3. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 1 is characterized in that: The first pump is driven by a diaphragm pump, and the first pressure regulator is filled with carbon dioxide.

4. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 1 is characterized in that: The first pressure stabilizer comprises a pressure-bearing shell and an electric heating element. The pressure-bearing shell contains a sealed cavity into which the electric heating element extends. The sealed cavity is communicated with the inlet end of the first pump.

5. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 1 is characterized in that: The second loop system includes a mixer, a pump cooler and a second pump. The mixer, the low-temperature side of the cooler experimental body, the pump cooler, the second pump and the cooling medium heat exchange pipe are connected in series to form a loop, and the hot side inlet and outlet of the mixer are connected to the cooling medium heat exchange pipe and the low-temperature side of the cooler experimental body respectively; the outlet end of the second pump is connected to the cold side inlet of the mixer and the cooling medium heat exchange pipe respectively through the fourth regulating valve and the fifth regulating valve.

6. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 5 is characterized in that: A second regulating pipeline is provided between the inlet and outlet of the second pump, and a third regulating valve is provided on the second regulating pipeline.

7. The high-efficiency and compact heat exchanger performance test platform for water-carbon dioxide heat exchange according to claim 5 is characterized in that: The outlet end of the second pump is connected to a second pressure stabilizer, and the second pressure stabilizer is filled with a pressure stabilizing medium, which is nitrogen or helium.

8. A method for testing the performance of a highly efficient and compact heat exchanger for water-carbon dioxide heat exchange, characterized in that: The method is applied to the high-efficiency compact heat exchanger performance test platform for water-carbon dioxide heat exchange as claimed in any one of claims 1 to 7, and the method comprises: (1) using high-purity carbon dioxide to purge the first loop system, detecting the purity of carbon dioxide in the first loop system, and when the purity of carbon dioxide reaches a predetermined value, continuously injecting carbon dioxide into the first loop system until the loop pressure reaches a predetermined value; (2) Adjust the first regulator of the first loop system to keep the pressure stable; (3) starting and adjusting the first loop system so that the flow rate of carbon dioxide entering the boiler reaches a predetermined value; (4) adjusting the second regulator of the second loop system so that the pressure of the second loop system reaches the target value; (5) Start and adjust the second loop system so that the flow rate of cooling medium entering the boiler reaches a predetermined value; (6) Starting the boiler and adjusting the outlet temperature of the carbon dioxide in the first loop system and the cooling medium in the second loop system; (7) arranging a mixer in the second loop system, and adjusting the cold side inlet flow and the hot side inlet flow of the mixer in the second loop system so that the inlet temperature of the cooling medium on the low temperature side of the cooler experimental body reaches a predetermined value; (8) When the main thermal parameters reach the control targets, carry out relevant tests.

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