Regenerative heat exchanger test system and method based on energy storage principle

Abstract

The invention discloses a regenerative heat exchanger test system based on an energy storage principle, which comprises a first circulating water path, a second circulating water path, a heat accumulator pipeline (10) and a regenerator pipeline (12), and is characterized in that the first circulating water path comprises a heater (6), the heat accumulator pipeline (10) comprises a heat accumulator (1), and the regenerator pipeline (12) comprises a regenerator (12b); the regenerative heat exchanger test sections (5) are connected in series with the first circulating water path and the second circulating water path, the heat accumulator pipeline (10) is connected in parallel with the first circulating water path, and the regenerator pipeline (12) is connected in parallel with the second circulating water path. The requirement of the regenerative heat exchanger test for the laboratory power utilization rated power and the requirement for the cooling capacity of the air cooling tower are greatly reduced, the test flexibility is improved, and meanwhile the test cost is saved.

Description

Technical Field

[0001] The invention relates to the field of nuclear power plant or nuclear engineering design, and in particular to a regenerative heat exchanger test system and method based on energy storage principle. Background Art

[0002] In a pressurized water reactor nuclear power system, one of the main functions of the chemical and volume control system (RCV) is to maintain the pressurizer water level at a programmed level by charging and discharging. The regenerative heat exchanger is designed to recover the heat discharged to preheat the charging flow. When the laboratory conducts a performance study on the chemical and volume control system, in order to ensure that the test conditions are close to the actual conditions of the nuclear power plant and further improve the credibility of the test data, equipment similar to that of the power plant is often used and the temperature, flow, pressure and other conditions are reasonably controlled.

[0003] Since the heat exchange power of the regenerative heat exchanger is relatively large when it is charged and discharged, it can reach more than 3MW under certain test conditions; however, it is rare for conventional large laboratories to support electric heating power of more than 1MW, and correspondingly, air-cooling towers that support cooling power of more than 3MW are relatively rare. If the electric heating power is increased, it will not only greatly increase the cost of laboratory expansion, but also increase the volume of the main heating and the number of heating rods, and it will also be difficult for daily maintenance; accordingly, the cooling capacity of the air-cooling tower needs to be improved, and air-cooling towers with cooling power of more than 3MW have greatly increased the cost budget; since the heating power of more than 1MW in the laboratory is used less frequently, most electric heaters will be idle, and the air-cooling tower will be far from reaching the rated cooling power, which will cause idle resources.

[0004] The existing patent GB2613283B discloses a multi-source regenerative compressed air energy storage comprehensive utilization system and method, which belongs to the field of energy storage technology. In the compressed air energy storage system in the prior art, the system stability and working efficiency will be reduced during the energy release process because the temperature does not meet the requirements. In addition, the existing system cannot simultaneously meet multiple functions such as output, cooling, heating and gas supply. A multi-source regenerative compressed air energy storage comprehensive utilization system is proposed, including a packed bed heat storage device, a heat storage circuit, a heat release circuit, a gas storage circuit, a photothermal circuit, a heating circuit and a cooling circuit. The system heats the heat storage circuit and the heat release circuit through the photothermal circuit, realizes the versatility of the system, improves the stable working performance and efficiency of the system, and realizes continuous heating and cooling. It does not solve the current problem of supporting high-power heat exchange tests under certain conditions for the regenerative heat exchanger.

[0005] The existing patent CN213933528U discloses a high-temperature and high-flow rate droplet erosion experimental device, including a high-temperature and high-pressure experimental circuit, an upper filling and lower discharge auxiliary circuit, an upper heating rod, a lower heating rod, and a rotating disk; the high-temperature and high-pressure experimental circuit includes a flow meter, an experimental chamber, a high-temperature rotary pump, a high-temperature circulation pump, and a steam generator; the upper filling and lower discharge auxiliary circuit includes a steam generator, a regenerative heat exchanger, a cooler, a high-pressure pump, a water chemistry control system, an upper filling pipeline, and a lower discharge pipeline. The impact angle, impact velocity, gas content, and water chemistry parameters can be adjusted, and experimental results in a large range can be obtained, but the current problem of supporting high-power heat exchange tests under certain conditions for regenerative heat exchangers has not been solved. Summary of the invention

[0006] Based on the above technical problems, the present invention proposes a regenerative heat exchanger test system and method based on the energy storage principle to solve the problem in the prior art that the regenerative heat exchanger supports high-power heat exchange tests under certain conditions.

[0007] To achieve the above objectives, the present invention proposes a regenerative heat exchanger test system based on the energy storage principle.

[0008] A regenerative heat exchanger test system based on energy storage principle, comprising:

[0009] The invention comprises a first circulating water circuit, a second circulating water circuit, a heat accumulator pipeline and a cold accumulator pipeline, wherein the first circulating water circuit comprises a heater, the heat accumulator pipeline comprises a heat accumulator, and the cold accumulator pipeline comprises a cold accumulator;

[0010] The regenerative heat exchanger test sections are connected in series to the first circulating water circuit and the second circulating water circuit, the heat accumulator pipeline is connected in parallel to the first circulating water circuit, and the cold accumulator pipeline is connected in parallel to the second circulating water circuit.

[0011] Furthermore, the first circulating water circuit includes a regenerative heat exchanger test pipeline, which is connected in parallel with the heat accumulator pipeline; the second circulating water circuit includes a heat exchange pipeline, which is connected in parallel with the cold accumulator pipeline, and the regenerative heat exchanger test pipeline, the heat accumulator pipeline, the heat exchange pipeline and the cold accumulator pipeline are all provided with regulating valves.

[0012] Furthermore, the first circulating water circuit also includes a mixer, which is arranged upstream of the water inlet of the heater and is used to mix the cooling water of the regenerative heat exchanger test pipeline and the heat accumulator.

[0013] Furthermore, the heat accumulator pipeline includes an energy storage tank, and the energy storage tank is connected to the heat accumulator in a heat exchangeable manner.

[0014] Furthermore, the energy storage tank includes energy storage material, and the energy storage material is placed inside the energy storage tank.

[0015] Furthermore, the energy storage tank also includes a heat pipe heat exchanger, which is connected to the energy storage tank and the heat accumulator and is used for transferring heat between the heat accumulator and the energy storage tank.

[0016] Furthermore, the heat pipe heat exchanger also includes a cooling medium, which is placed inside the heat pipe heat exchanger, and the volume proportion of the cooling medium in the heat pipe heat exchanger is 0.2-0.33.

[0017] Furthermore, the water vapor pressure inside the energy storage tank is controlled at 20Pa-1100Pa.

[0018] Furthermore, the internal temperature of the energy storage tank is controlled at 500°C-600°C.

[0019] Furthermore, the heat accumulator comprises a heat insulation board, a water outlet, an electric heater, cooling water, a heat accumulator water outlet and a heat accumulator water inlet, wherein the heat insulation board and the electric heater are arranged inside the heat accumulator and are arranged in sequence at intervals, and one of the water outlets is alternately arranged at both ends of each heat insulation board, so that the flow trajectory of the cooling water in the heat accumulator is S-shaped;

[0020] The water inlet of the heat accumulator serves as the inlet for the cooling water, and the water outlet of the heat accumulator is connected to the mixer.

[0021] Furthermore, the first circulating water circuit also includes an ultrasonic flow meter and a circulating water pump, and the ultrasonic flow meter is arranged between the circulating water pump and the regenerative heat exchanger test pipeline.

[0022] Furthermore, the heat exchange pipeline includes a plate heat exchanger.

[0023] Furthermore, the second circulating water circuit includes a cooling tower, the cooling tower is connected to the water inlet and the water outlet of the plate heat exchanger, and the cooling tower is arranged in parallel with the heat exchange pipeline.

[0024] Furthermore, the second circulating water circuit also includes an electromagnetic flowmeter, which is arranged in the second circulating water circuit and located at the water outlet of the regenerative heat exchanger test section.

[0025] To achieve the above objectives, the present invention also proposes a regenerative heat exchanger test method based on the energy storage principle.

[0026] A regenerative heat exchanger test method based on energy storage principle, comprising:

[0027] S2: Determine the heat exchange power of the regenerative heat exchanger test section. If the heat exchange power of the regenerative heat exchanger test section is within 1MW, control the regulating valve to allow cooling water to flow into the regenerative heat exchanger test pipeline and the heat exchange pipeline for testing;

[0028] If the power of the heat exchange of the regenerative heat exchanger test section is higher than 1MW, the test is carried out by controlling the regulating valve to allow cooling water to pass through the heat accumulator pipeline and the cold accumulator pipeline.

[0029] Furthermore, the step S2 further includes:

[0030] If the rated operating conditions or extended operating conditions occur during the test, the energy storage tank in the first circulating water circuit is started to increase the heat exchange power for testing.

[0031] Furthermore, before step S2, the following steps are included:

[0032] S1: Open the cold storage pipeline and the heat exchange pipeline, and keep other pipelines in the closed state. Open the air cooling tower, pass the cooling water in the plate heat exchanger and the cold storage to the target temperature, close the regenerative heat exchanger test pipeline, the cold storage pipeline and the heat exchange pipeline, open the heat storage pipeline, heat the cooling water in the heat storage to the target temperature, heat the regenerative heat exchanger test pipeline through the heater, start the circulating water pump, control the water flow, and make the water temperature rise evenly and steadily.

[0033] Furthermore, the step S1 further includes:

[0034] The cooling water inside the heat accumulator flows in an S shape between the insulation plates. When the cooling water in the heat accumulator reaches the target temperature, the electric heater is turned on to maintain the temperature of the cooling water, and the heat accumulator pipeline is closed.

[0035] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0036] 1. The regenerative heat exchanger test system based on the energy storage principle proposed in the present invention can achieve a heat exchange power exceeding the rated electrical heating power of the laboratory within a certain period of time, making the test conditions closer to the operating conditions of the actual power plant and improving the credibility of the test data. The storage design of the heat accumulator and the cold accumulator provides the test system with the flexibility to operate under different working conditions, allowing the system to quickly respond to different test requirements, including outside the rated working conditions or expanded working conditions, thereby enhancing the adaptability and reliability of the test system.

[0037] 2. The present invention proposes a regenerative heat exchanger test system and method based on the energy storage principle. Through the design of the heat storage system, the system is capable of achieving the working condition of "heat exchange power exceeding the rated electric heating power of the laboratory and cooling power exceeding the rated cooling capacity of the air-cooling tower". This not only makes the test conditions closer to the actual application conditions of the power plant and improves the credibility of the test data, but also reduces the design and equipment costs of the test.

[0038] 3. The present invention proposes a regenerative heat exchanger test system and method based on the energy storage principle. The single-body gravity heat pipe heat exchanger and nanofluid working medium used in this system not only improve the heat exchange efficiency between the energy storage tank and the heat accumulator, but also enhance the safety of the system. This efficient heat exchange design reduces heat loss, improves energy utilization efficiency, and also reduces operational risks, ensuring the safety of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 A structural diagram of a regenerative heat exchanger test system according to an embodiment is shown;

[0041] Figure 2 A bottom view of a heat storage structure of one embodiment is shown;

[0042] Figure 3 A schematic diagram showing the flow of cooling water in a heat accumulator according to an embodiment is shown;

[0043] Figure 4 The internal structure diagram of the heat storage device of one embodiment is shown;

[0044] Figure 5 A schematic diagram of the structure of an energy storage tank according to an embodiment is shown.

[0045] The above-mentioned drawings include the following reference numerals:

[0046] 1. Heat accumulator; 2. Energy storage tank; 3. Ultrasonic flowmeter; 4. Circulating water pump; 5. Regenerative heat exchanger test section; 6. Heater; 7. Mixer; 8. Regulating valve; 9. Regenerative heat exchanger test system pipeline; 10. Heat accumulator pipeline; 11. Electromagnetic flowmeter; 12. Cold accumulator pipeline; 13. Heat exchange pipeline; 14. Cooling tower; 15. Regulating valve; 16. Regulating valve; 17. Regulating valve;

[0047] 1a, heat insulation board; 1b, water outlet; 1c, electric heater; 1d, water outlet of heat accumulator; 1e, water inlet of heat accumulator; 1f, cooling water; 1g, condensation end;

[0048] 2a, energy storage material; 2b, heat pipe heat exchanger; 2c, safety valve; 2d, heating end; 2e, cooling medium;

[0049] 12a, circulating water pump; 12b, cold storage device;

[0050] 13a. Circulating water pump; 13b. Plate heat exchanger. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of 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 for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0053] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] Example

[0055] The present invention proposes a regenerative heat exchanger test system based on energy storage principle, such as Figure 1 As shown, it includes a first circulating water circuit, a second circulating water circuit, a heat accumulator pipeline 10 and a cold accumulator pipeline 12, wherein the first circulating water circuit includes a heater 6, the heat accumulator pipeline 10 includes a heat accumulator 1, and the cold accumulator pipeline 12 includes a cold accumulator 12b;

[0056] The regenerative heat exchanger test sections 5 are connected in series to the first circulating water circuit and the second circulating water circuit, the heat accumulator pipeline 10 is connected in parallel to the first circulating water circuit, and the cold accumulator pipeline 12 is connected in parallel to the second circulating water circuit.

[0057] Furthermore, the heat accumulator 1 can store cooling water of a certain temperature and volume, and is started when the heat exchange power of the regenerative heat exchanger test system is greater than the rated power of electricity, which can ensure the normal operation of the test system within a certain time range. Figure 2 and Figure 4 As shown, the heat accumulator 1 is equipped with 8 groups of electric heaters 1c, and the heating power of each group of electric heaters 1c is 7kW; the cold accumulator 12b can store cooling water of a certain temperature and volume, and is started when the heat exchange capacity of the heat exchange pipe 13 is less than the heat exchange power of the regenerative heat exchanger test section 5, which can ensure the normal operation of the test system within a certain time range.

[0058] Furthermore, the volume V2 of the cold storage device 12 b and the volume V1 of the heat storage device 12 b satisfy the relationship: 0.3V1≤V2≤0.7V1.

[0059] Furthermore, the rated electric heating power of the regenerative heat exchanger test section 5 is 1 MW, and the maximum cooling power of the air cooling tower 14 of the heat exchange pipe 13 is 1 MW.

[0060] Furthermore, if Figure 5 The energy storage material 2a of the energy storage tank 2 shown in the figure may be CaO, and the volume of the energy storage material 2a is greater than or equal to 4m 3 The energy storage material 2a can react with water vapor and release a large amount of heat energy, and the efficiency of heat release can be controlled by controlling the water vapor flow rate.

[0061] Furthermore, if Figure 5 The cooling medium 2e inside the heat pipe heat exchanger 2b shown can be a water-based aluminum oxide nanofluid with a mass fraction of 0.1%.

[0062] Furthermore, the water outlet of the heater 6 is connected to the water inlet on the shell side of the regenerative heat exchanger test section 5; a temperature controller is arranged inside the heater 6, which continuously adjusts the heating power by receiving temperature feedback from the water inlet and the water outlet of the heater 6; a plurality of electric heating rods are arranged inside the heater 6, and the maximum heating power is greater than or equal to 1MW.

[0063] To achieve the above object, the present invention further proposes a regenerative heat exchanger test method based on the energy storage principle, using the regenerative heat exchanger test system based on the energy storage principle described above, comprising the following steps:

[0064] S2: Determine the heat exchange power of the regenerative heat exchanger test section 5. If the heat exchange power of the regenerative heat exchanger test section 5 is within 1MW, control the regulating valves 8, 15, 16, and 17 to allow cooling water to flow into the regenerative heat exchanger test pipeline 9 and the heat exchange pipeline 13 for testing;

[0065] If the power of the heat exchange of the regenerative heat exchanger test section 5 is higher than 1MW, the test is carried out by controlling the regulating valves 8, 15, 16, 17 to allow cooling water to pass through the heat accumulator pipeline 10 and the cold accumulator pipeline 12.

[0066] In this embodiment, when the power of the hot and cold exchange of the regenerative heat exchanger test section 5 does not exceed 1MW, the cooling water is controlled to flow into the regenerative heat exchanger test pipeline 9 and the heat exchange pipeline 13 by opening the regulating valves 8 and 17 and closing the regulating valves 25 and 26. The cooling water flows out through the heater 6 with a temperature reference value of 293°C, enters the shell side of the regenerative heat exchanger test section 5, and flows into the tube side of the regenerative heat exchanger test section 5 through the plate heat exchanger 13 with a temperature reference value of 54°C.

[0067] When the power of heat exchange is greater than 1MW, open the regulating valves 15 and 17, and close the regulating valve 8, so that the high-temperature cooling water with a temperature reference value of 280°C in the heat storage device flows into the heater 6, and the cooling water with an outflow temperature reference value of 293°C is heated by the heater and flows into the shell side of the regenerative heat exchanger test section 5, and is cooled by the cold storage device 12b and the air cooling tower 14, so that the temperature of the cooling water flowing into the tube side is the reference value of 54°C.

[0068] Furthermore, the step S2 further includes:

[0069] If an extra-rated operating condition or an extended operating condition occurs during the test, the energy storage tank 2 in the first circulating water circuit is started to increase the heat exchange power for testing.

[0070] In a specific implementation, if the cooling water flowing into the shell side of the regenerative heat exchanger test section 5 needs to be slightly higher than the reference value of 293°C under the extended operating condition, the energy storage material 2a is used to react with water vapor. At this time, the internal temperature of the energy storage tank 2 can reach above 500°C, and the heat is transferred to the heat accumulator 1 through the heat pipe heat exchanger 2b.

[0071] Furthermore, before step S2, the following steps are included:

[0072] S1: Open the cold storage pipeline 12 and the heat exchange pipeline 13, and keep other pipelines in the closed state. Open the air cooling tower 14, and cool the water in the plate heat exchanger 13b and the cold storage 12b to the target temperature. Close the regenerative heat exchanger test pipeline 9, the cold storage pipeline 12 and the heat exchange pipeline 13, open the heat storage pipeline 10, heat the cooling water 1f in the heat storage 1 to the target temperature, heat the regenerative heat exchanger test pipeline 9 through the heater 6, start the circulating water pump 4, control the water flow, and make the water temperature rise evenly and steadily.

[0073] Furthermore, the step S1 further includes:

[0074] The cooling water 1f inside the heat accumulator 1 flows in an S shape between the insulation plates 1a. When the cooling water 1f in the heat accumulator 1 reaches the target temperature, the electric heater 1c is turned on to maintain the temperature of the cooling water 1f, and the heat accumulator pipeline 10 is closed.

[0075] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0076] 1. The regenerative heat exchanger test system based on the energy storage principle proposed in the present invention can achieve a heat exchange power exceeding the rated electrical heating power of the laboratory within a certain period of time, making the test conditions closer to the operating conditions of the actual power plant and improving the credibility of the test data. The storage design of the heat accumulator and the cold accumulator provides the test system with the flexibility to operate under different working conditions, allowing the system to quickly respond to different test requirements, including outside the rated working conditions or expanded working conditions, thereby enhancing the adaptability and reliability of the test system.

[0077] 2. The present invention proposes a regenerative heat exchanger test system and method based on the energy storage principle. Through the design of the heat storage system, the system is capable of achieving the working condition of "heat exchange power exceeding the rated electric heating power of the laboratory and cooling power exceeding the rated cooling capacity of the air-cooling tower". This not only makes the test conditions closer to the actual application conditions of the power plant and improves the credibility of the test data, but also reduces the design and equipment costs of the test.

[0078] 3. The present invention proposes a regenerative heat exchanger test system and method based on the energy storage principle. The single-body gravity heat pipe heat exchanger and nanofluid working medium used in this system not only improve the heat exchange efficiency between the energy storage tank and the heat accumulator, but also enhance the safety of the system. This efficient heat exchange design reduces heat loss, improves energy utilization efficiency, and also reduces operational risks, ensuring the safety of the test process.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0081] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A regenerative heat exchanger test system based on energy storage principle, characterized in that: The invention comprises a first circulating water circuit, a second circulating water circuit, a heat accumulator pipeline (10) and a cold accumulator pipeline (12), wherein the first circulating water circuit comprises a heater (6), the heat accumulator pipeline (10) comprises a heat accumulator (1), and the cold accumulator pipeline (12) comprises a cold accumulator (12b); The regenerative heat exchanger test section (5) is connected in series to the first circulating water circuit and the second circulating water circuit, the heat accumulator pipeline (10) is connected in parallel to the first circulating water circuit, and the cold accumulator pipeline (12) is connected in parallel to the second circulating water circuit.

2. The system according to claim 1, characterized in that: The first circulating water circuit comprises a regenerative heat exchanger test pipeline (9), and the regenerative heat exchanger test pipeline (9) is connected in parallel with the heat accumulator pipeline (10); the second circulating water circuit comprises a heat exchange pipeline (13), and the heat exchange pipeline (13) is connected in parallel with the cold accumulator pipeline (12); and regulating valves (8, 15, 16, 17) are provided on the regenerative heat exchanger test pipeline (9), the heat accumulator pipeline (10), the heat exchange pipeline (13) and the cold accumulator pipeline (12).

3. The system according to claim 2, characterized in that: The first circulating water circuit further comprises a mixer (7), The mixer (7) is arranged at an upstream position of the water inlet of the heater (6) and is used to mix the cooling water of the regenerative heat exchanger test pipeline (9) and the heat accumulator (1).

4. The system according to claim 1, characterized in that: The heat accumulator pipeline (10) comprises an energy storage tank (2), The energy storage tank (2) is connected to the heat accumulator (1) in a heat exchangeable manner.

5. The system according to claim 4, characterized in that: The energy storage tank (2) comprises an energy storage material (2a), The energy storage material (2a) is placed inside the energy storage tank (2).

6. The system according to claim 4, characterized in that: The energy storage tank (2) further comprises a heat pipe heat exchanger (2b), The heat pipe heat exchanger (2b) is connected to the energy storage tank (2) and the heat accumulator (1) and is used for transferring heat between the heat accumulator (1) and the energy storage tank (2).

7. The system according to claim 6, characterized in that: The heat pipe heat exchanger (2b) further comprises a cooling medium (2e), The cooling medium (2e) is placed inside the heat pipe heat exchanger (2b), and the volume ratio of the cooling medium (2e) in the heat pipe heat exchanger (2b) is 0.2-0.

33.

8. The system according to claim 4, characterized in that: The water vapor pressure inside the energy storage tank (2) is controlled within a range of 20Pa-1100Pa.

9. The system according to claim 4, characterized in that: The internal temperature of the energy storage tank (2) is controlled at 500°C-600°C.

10. The system according to claim 3, characterized in that: The heat accumulator (1) comprises a heat insulation board (1a), a water outlet (1b), an electric heater (1c), cooling water (1f), a heat accumulator water outlet (1d) and a heat accumulator water inlet (1e), The heat insulation board (1a) and the electric heater (1c) are arranged inside the heat accumulator (1) and are arranged in sequence and at intervals. A water flow outlet (1b) is alternately arranged at both ends of each heat insulation board (1a), so that the flow trajectory of the cooling water (1f) in the heat accumulator (1) is S-shaped; The heat accumulator water inlet (1e) serves as an inlet for the cooling water (1f), and the heat accumulator water outlet (1d) is connected to the mixer (7).

11. The system according to claim 2, characterized in that: The first circulating water circuit also includes an ultrasonic flow meter (3) and a circulating water pump (4). The ultrasonic flow meter (3) is arranged between the circulating water pump (4) and the regenerative heat exchanger test pipeline (9).

12. The system according to claim 2, characterized in that: The heat exchange pipeline (13) includes a plate heat exchanger (13b).

13. The system according to claim 12, characterized in that: The second circulating water circuit includes a cooling tower (14), The cooling tower (14) is connected to the water inlet and the water outlet of the plate heat exchanger (13b), and the cooling tower (14) is arranged in parallel with the heat exchange pipeline (13).

14. The system according to claim 1, characterized in that: The second circulating water circuit further includes an electromagnetic flowmeter (11). The electromagnetic flowmeter (11) is arranged in the second circulating water circuit, located at the water outlet of the regenerative heat exchanger test section (5).

15. A regenerative heat exchanger test method based on energy storage principle using the system as claimed in claim 2, characterized in that: include: S2: judging the heat exchange power of the regenerative heat exchanger test section (5); if the heat exchange power of the regenerative heat exchanger test section (5) is within 1MW, controlling the regulating valves (8, 15, 16, 17) to allow cooling water to flow into the regenerative heat exchanger test pipeline (9) and the heat exchange pipeline (13) for testing; If the power of the heat exchange of the regenerative heat exchanger test section (5) is higher than 1MW, the test is carried out by controlling the regulating valves (8, 15, 16, 17) to allow cooling water to pass through the heat accumulator pipeline (10) and the cold accumulator pipeline (12).

16. The method according to claim 15, characterized in that: The step S2 further includes: If an extra-rated operating condition or an extended operating condition occurs during the test, the energy storage tank (2) in the first circulating water circuit is started to increase the heat exchange power for testing.

17. The method according to claim 15, characterized in that: Before step S2, the method includes: S1: Open the cold storage pipeline (12) and the heat exchange pipeline (13), and keep other pipelines in a closed state. Open the air cooling tower (14), and heat the cooling water in the plate heat exchanger (13b) and the cold storage (12b) to the target temperature. Close the regenerative heat exchanger test pipeline (9), the cold storage pipeline (12) and the heat exchange pipeline (13). Open the heat storage pipeline (10), and heat the cooling water (1f) in the heat storage (1) to the target temperature. Heat the regenerative heat exchanger test pipeline (9) through the heater (6). Open the circulating water pump (4), and control the water flow to increase the water temperature evenly and stably.

18. The method according to claim 17, characterized in that: The step S1 further includes: The cooling water (1f) inside the heat accumulator (1) flows in an S-shape between the heat insulation plates (1a); when the cooling water (1f) in the heat accumulator (1) reaches a target temperature, the electric heater (1c) is turned on to maintain the temperature of the cooling water (1f), and the heat accumulator pipeline (10) is closed.

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