A molten salt storage tank testing device and a molten salt storage tank testing method

Abstract

The application discloses a molten salt storage tank testing device, and relates to the field of solar thermal power generation.The molten salt storage tank testing device comprises a molten salt temperature adjusting device, a molten salt circulating device and a molten salt storage tank to be tested.The output end of the molten salt temperature adjusting device is connected with the input end of the molten salt storage tank to be tested through a molten salt input pipeline.The input end of the molten salt temperature adjusting device is connected with the output end of the molten salt storage tank to be tested through a molten salt output pipeline.The molten salt circulating device is connected with the molten salt input pipeline or the molten salt output pipeline.The molten salt storage tank to be tested is provided with a temperature sensor and a stress sensor.The molten salt storage tank testing device provided by the application enables molten salt at different temperatures to continuously circulate in the molten salt storage tank to be tested, thereby realizing the effect of alternating temperature changes in the molten salt storage tank to be tested.The stress changes caused by temperature changes and liquid level changes at the measuring point can be obtained by monitoring the inner wall temperature and the outer wall stress of the molten salt storage tank to be tested, the thermal fatigue law of the molten salt storage tank to be tested is obtained, and the thermodynamic characteristics of the molten salt storage tank to be tested are mastered.

Description

Technical Field

[0001] This invention relates to the field of solar thermal power generation, and in particular to a molten salt storage tank testing device and a molten salt storage tank testing method. Background Technology

[0002] China aims to peak its carbon emissions by 2030 and achieve carbon neutrality by 2060. Driven by this dual-carbon strategy, solar thermal power generation, with its advantage of large-scale, long-term heat storage, will play a crucial role in building a new power system based on green energy. Molten salt thermal storage is the mainstream thermal storage technology in existing commercial solar thermal power plants. The molten salt storage tank is a key component of the thermal storage system, operating at temperatures up to 565℃. During operation, it may experience leaks due to corrosion, thermal cycling fatigue, weld defects, etc., causing significant economic losses to the power plant. Therefore, conducting various performance tests on the high-temperature molten salt storage tank and understanding its thermodynamic characteristics are crucial to ensuring the operational reliability of the high-temperature molten salt storage tank.

[0003] In existing technologies, temperature sensors are installed inside the molten salt tank and on the tank body to test the temperature distribution of the storage tank and the molten salt, thereby understanding the thermal characteristics of the storage tank during operation. However, research on testing systems and methods for the mechanical properties of the storage tank is still lacking. Mechanical properties are one of the important factors in studying system failures such as leaks caused by thermal fatigue in molten salt storage tanks. Therefore, it is essential to comprehensively study testing methods and systems for the thermodynamic properties of molten salt storage tanks. Summary of the Invention

[0004] The purpose of this invention is to provide a molten salt tank testing device to solve the problems existing in the prior art. It allows test molten salt at different temperatures to continuously circulate in the molten salt tank under test, achieving the effect of alternating temperature changes inside the molten salt tank. At the same time, the height of the test molten salt in the molten salt tank under test can also be adjusted. By monitoring the inner wall temperature and outer wall stress of the molten salt tank under test, the stress changes at the measuring point caused by temperature changes and liquid level changes can be obtained, thereby obtaining the thermal fatigue law of the molten salt tank under test and understanding its thermodynamic characteristics.

[0005] The present invention also provides a method for testing molten salt storage tanks. Based on the above-mentioned molten salt storage tank testing device, the method can test the alternating temperature and alternating liquid level of the molten salt storage tank under test, and collect the temperature and stress data of the molten salt storage tank under test to understand the thermodynamic characteristics of the molten salt storage tank under test.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a molten salt storage tank testing device, including a molten salt temperature adjustment device, a molten salt circulation device, and a molten salt storage tank under test. The output end of the molten salt temperature adjustment device is connected to the input end of the molten salt storage tank under test through a molten salt input pipe, and the input end of the molten salt temperature adjustment device is connected to the output end of the molten salt storage tank under test through a molten salt output pipe.

[0008] The molten salt circulation device is connected to the molten salt input pipe or the molten salt output pipe;

[0009] The molten salt storage tank under test is equipped with a temperature sensor, which includes a tank wall temperature sensor for measuring the inner wall temperature of the molten salt storage tank under test and a molten salt temperature sensor for measuring the molten salt temperature inside the molten salt storage tank under test.

[0010] The molten salt storage tank under test is also equipped with a stress sensor for measuring the stress on the outer wall of the tank.

[0011] Preferably, the stress sensor includes a tank wall stress sensor for measuring the side wall stress of the molten salt storage tank under test and a tank bottom stress sensor for measuring the bottom stress of the molten salt storage tank under test.

[0012] Preferably, the molten salt input pipeline includes a main feed pipe and a feed branch pipe connected to the main feed pipe, and different feed branch pipes are connected to the input ends of different molten salt storage tanks being tested;

[0013] The molten salt output pipeline includes a main discharge pipe and a branch discharge pipe connected to the main discharge pipe. Different branch discharge pipes are connected to the output ends of different molten salt storage tanks being tested.

[0014] Preferably, each of the discharge branch pipes is equipped with a molten salt inlet shut-off valve for adjusting the flow rate of molten salt entering the tank, and each of the discharge branch pipes is equipped with a molten salt outlet shut-off valve for adjusting the flow rate of molten salt in the storage tank.

[0015] Preferably, the molten salt storage tank under test includes a No. 1 test tank, a No. 2 test tank, and a No. 3 test tank, and the molten salt inlet shut-off valve includes a No. 1 inlet shut-off valve disposed at the input end of the No. 1 test tank, a No. 2 inlet shut-off valve disposed at the input end of the No. 2 test tank, and a No. 3 inlet shut-off valve disposed at the input end of the No. 3 test tank.

[0016] The molten salt outlet shut-off valve includes a first outlet shut-off valve installed at the output end of the first tested storage tank, a second outlet shut-off valve installed at the output end of the second tested storage tank, and a third outlet shut-off valve installed at the output end of the third tested storage tank.

[0017] Preferably, a No. 1 wall temperature sensor and a No. 1 molten salt temperature sensor are installed on the top of the No. 1 test tank, a No. 1 wall stress sensor is installed on the side wall of the No. 1 test tank, and a No. 1 tank bottom stress sensor is installed on the bottom of the No. 1 test tank.

[0018] The top of the No. 2 test tank is equipped with a No. 2 tank wall temperature sensor and a No. 2 molten salt temperature sensor. The side wall of the No. 2 test tank is equipped with a No. 2 wall stress sensor. The bottom of the No. 2 test tank is equipped with a No. 2 tank bottom stress sensor.

[0019] The top of the No. 3 test tank is equipped with a No. 3 wall temperature sensor and a No. 3 molten salt temperature sensor. The side wall of the No. 3 test tank is equipped with a No. 3 wall stress sensor. The bottom of the No. 3 test tank is equipped with a No. 3 tank bottom stress sensor.

[0020] The first tested storage tank is also equipped with a No. 1 level gauge, the second tested storage tank is also equipped with a No. 2 level gauge, and the third tested storage tank is also equipped with a No. 3 level gauge.

[0021] Preferably, the circulation device is a molten salt pump, which includes a first molten salt pump installed at the output end of the first tested storage tank, a second molten salt pump installed at the output end of the second tested storage tank, and a third molten salt pump installed at the output end of the third tested storage tank.

[0022] Preferably, the temperature adjustment device includes a heater for increasing the temperature of the molten salt, a cooler for decreasing the temperature of the molten salt, and a straight pipe for directly transporting the molten salt. The molten salt output pipe connects the inlet end of the heater, the inlet end of the cooler, and the inlet end of the straight pipe. The molten salt input pipe connects the outlet end of the heater, the outlet end of the cooler, and the outlet end of the straight pipe.

[0023] The heater is equipped with a heater inlet shut-off valve at the inlet end and a heater outlet shut-off valve at the outlet end. The cooler is equipped with a cooler inlet shut-off valve at the inlet end and a cooler outlet shut-off valve at the outlet end. A straight pipe shut-off valve is installed on the straight pipe.

[0024] Preferably, it also includes a salt-absorbing vessel, the input end of which is connected to the output end of the molten salt storage tank under test, and the output end of which is connected to the input end of the molten salt temperature adjustment device;

[0025] The output end of the salt-free tank is equipped with a salt-free pump, the top of the salt-free tank is equipped with a salt-free tank level gauge and a salt-free molten salt temperature sensor for measuring the temperature of the molten salt inside the salt-free tank, and the salt-free tank is also equipped with a salt-free tank heater.

[0026] The present invention also provides a method for testing molten salt storage tanks, based on the above-mentioned two molten salt storage tank testing devices, comprising the following steps:

[0027] S1. The molten salt is fed into the molten salt temperature adjustment device, and the test molten salt is heated and cooled according to the test requirements to form test molten salt. The test molten salt is then output to the test molten salt storage tank, or the molten salt that enters the molten salt temperature adjustment device is directly output as test molten salt to the test molten salt storage tank.

[0028] S2. Start the molten salt circulation device and adjust the opening and closing state of the shut-off valve so that the test molten salt obtained in S1 enters the target molten salt storage tank.

[0029] S3. The test molten salt circulates between the molten salt temperature adjustment device and the target molten salt storage tank. The molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt and records the temperature data and stress data of the target molten salt storage tank.

[0030] S4. End the test and empty the test molten salt in the molten salt circulation device and the molten salt storage tank.

[0031] The present invention achieves the following technical effects compared to the prior art:

[0032] This invention provides a molten salt tank testing device that continuously circulates test molten salt at different temperatures within the tested molten salt tank, achieving the effect of alternating temperature changes inside the tank. Simultaneously, the height of the test molten salt within the tank can be adjusted. By monitoring the inner wall temperature and outer wall stress of the tested molten salt tank, the stress changes at the measuring points caused by temperature and liquid level variations can be obtained, thereby revealing the thermal fatigue characteristics of the tested molten salt tank and understanding its thermodynamic properties.

[0033] The present invention also provides a method for testing molten salt storage tanks. Based on the above-mentioned molten salt storage tank testing device, the method can test the alternating temperature and alternating liquid level of the molten salt storage tank under test, and collect the temperature and stress data of the molten salt storage tank under test to understand the thermodynamic characteristics of the molten salt storage tank under test.

[0034] Compared with the prior art, the present invention also achieves the following technical effects:

[0035] 1. This invention can test multiple independent molten salt storage tanks. By adjusting the opening and closing status of each shut-off valve and the flow rate of each molten salt pump, a specific molten salt storage tank can be tested.

[0036] 2. In this invention, the position and number of temperature measuring points and stress measuring points on the tested molten salt storage tank can be adjusted according to the testing needs, thereby obtaining comprehensive data of the tested molten salt storage tank;

[0037] 3. In this invention, the heater, cooler and straight pipe are set independently, so that the heating, cooling and direct circulation of the test molten salt can be carried out independently, which improves the response speed of the molten salt temperature adjustment device and allows the test molten salt to change temperature more quickly during transportation, producing a reliable alternating temperature effect in the test molten salt storage tank.

[0038] 4. The present invention includes a salt-free tank for storing molten salt. When not being tested, the molten salt is stored in the salt-free tank. The salt-free tank heater can keep the molten salt in the salt-free tank in a flowing molten state, ensuring that the molten salt in the salt-free tank can be put into the test at any time. The molten salt temperature adjustment device and the test molten salt in the test molten salt storage tank can also be quickly recovered into the salt-free tank after the test is completed. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the molten salt storage tank testing device in an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram showing the orientation of the storage tank under test in an embodiment of the present invention.

[0042] Among them, 1. Test tank No. 1; 2. Test tank No. 2; 3. Test tank No. 3; 4. Salt-removing tank; 5. Heater; 6. Cooler; 7. Pipeline; 12. Molten salt pump No. 1; 22. Molten salt pump No. 2; 32. Molten salt pump No. 3; 42. Salt-removing pump; 44. Salt-removing tank heater; 51. Heater inlet shut-off valve; 52. Heater outlet shut-off valve; 61. Cooler inlet shut-off valve; 62. Cooler outlet shut-off valve; 71. Flow regulating valve 72. Shut-off valve; 73. Pipeline thermocouple; 74. Flow meter; 75. Pipeline thermocouple No. 2; 76. Pressure transmitter; 712. Outlet shut-off valve No. 1; 714. Salt drain valve for tank No. 1; 716. Molten salt inlet temperature sensor for tank No. 1; 718. Inlet shut-off valve No. 1; 722. Outlet shut-off valve No. 2; 724. Salt drain valve for tank No. 2; 726. Molten salt inlet temperature sensor for tank No. 2; 728. Inlet shut-off valve No. 2; 734. Salt drain valve for tank No. 3; 732. Outlet shut-off valve No. 3; 736. Molten salt inlet temperature sensor No. 3; 738. Inlet shut-off valve No. 3; 742. Molten salt outlet shut-off valve of the brine tank; 746. Molten salt inlet temperature sensor of the brine tank; 811. Wall temperature sensor No. 1; 813. Level gauge No. 1; 815. Molten salt temperature sensor No. 1; 817. Bottom stress sensor of tank No. 1; 819. Wall stress sensor No. 1; 821. Wall temperature sensor of tank No. 2; 823. Level gauge No. 2; 825. Molten salt temperature sensor No. 2; 827. Bottom stress sensor of tank No. 2; 829. Wall stress sensor No. 2; 831. Wall temperature sensor No. 3; 833. Level gauge No. 3; 835. Molten salt temperature sensor No. 3; 837. Bottom stress sensor of tank No. 3; 839. Wall stress sensor No. 3; 843. Level gauge of the brine tank; 845. Molten salt temperature sensor of the brine tank. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This invention provides a molten salt tank testing device that continuously circulates test molten salt at different temperatures within the tested molten salt tank, achieving the effect of alternating temperature changes inside the tank. Simultaneously, the height of the test molten salt within the tank can be adjusted. By monitoring the inner wall temperature and outer wall stress of the tested molten salt tank, the stress changes at the measuring points caused by temperature and liquid level variations can be obtained, thereby revealing the thermal fatigue characteristics of the tested molten salt tank and understanding its thermodynamic properties.

[0045] The present invention also provides a method for testing molten salt storage tanks. Based on the above-mentioned molten salt storage tank testing device, the method can test the alternating temperature and alternating liquid level of the molten salt storage tank under test, and collect the temperature and stress data of the molten salt storage tank under test to understand the thermodynamic characteristics of the molten salt storage tank under test.

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] like Figure 1 As shown, the present invention provides a molten salt storage tank testing device, characterized in that: it includes a molten salt temperature adjustment device, a molten salt circulation device, and a molten salt storage tank under test. The output end of the molten salt temperature adjustment device is connected to the input end of the molten salt storage tank under test through a molten salt input pipe. The input end of the molten salt temperature adjustment device is connected to the output end of the molten salt storage tank under test through a molten salt output pipe. The molten salt circulation device is connected to the molten salt input pipe or the molten salt output pipe. The molten salt input pipe and the molten salt output pipe together constitute part of the structure of pipe 7.

[0048] like Figure 1 As shown, the molten salt storage tank under test is equipped with temperature sensors. These sensors include a tank wall temperature sensor for measuring the temperature of the inner wall of the tank and a molten salt temperature sensor for measuring the temperature of the molten salt inside the tank. The inner wall of the molten salt storage tank, from which temperature measurements are required, includes the top wall, side walls, and bottom wall. Temperature measurement points are selected on the inner wall of the tank as needed before measurement, and the temperature sensors are installed at the selected locations. The molten salt storage tank is also equipped with stress sensors for measuring the stress on the outer wall of the tank. These stress sensors include a tank wall stress sensor for measuring the stress on the side walls of the tank and a tank bottom stress sensor for measuring the stress on the bottom of the tank. Stress measurement points are selected on the outer wall of the tank as needed before measurement, and the stress sensors are installed at the selected locations. Figure 2 As shown, in one embodiment, the coordinates of the tank are divided into three directions: axial (Y), circumferential (C), and radial (X), and the stress measuring point is selected as a three-parameter coordinate point.

[0049] like Figure 1As shown, the molten salt input pipeline includes a main feed pipe and a feed branch pipe connected to the main feed pipe. Different feed branch pipes are connected to the input ends of different molten salt storage tanks under test. The molten salt output pipeline includes a main discharge pipe and a feed branch pipe connected to the main discharge pipe. Different discharge branch pipes are connected to the output ends of different molten salt storage tanks under test. In order to effectively control the inflow and outflow of the molten salt storage tanks under test, each feed branch pipe is equipped with a molten salt inlet shut-off valve for adjusting the inflow of molten salt into the tank, and each discharge branch pipe is equipped with a molten salt outlet shut-off valve for adjusting the outflow of molten salt from the storage tank.

[0050] like Figure 1 As shown, in one embodiment, the tested molten salt storage tank includes a first tested storage tank 1, a second tested storage tank 2, and a third tested storage tank 3. The molten salt inlet shut-off valve includes a first inlet shut-off valve 718 disposed at the input end of the first tested storage tank 1, a second inlet shut-off valve 728 disposed at the input end of the second tested storage tank 2, and a third inlet shut-off valve 738 disposed at the input end of the third tested storage tank 3. The molten salt outlet shut-off valve includes a first outlet shut-off valve 712 disposed at the output end of the first tested storage tank 1, a second outlet shut-off valve 722 disposed at the output end of the second tested storage tank 2, and a third outlet shut-off valve 732 disposed at the output end of the third tested storage tank 3.

[0051] like Figure 1 As shown, the top of the first tested storage tank 1 is equipped with a first wall temperature sensor 811 and a first molten salt temperature sensor 815; the side wall of the first tested storage tank 1 is equipped with a first wall stress sensor 819; the bottom of the first tested storage tank 1 is equipped with a first tank bottom stress sensor 817; and a first molten salt inlet temperature sensor 716 is also installed at the input end of the first tested storage tank 1. The top of the second tested storage tank 2 is equipped with a second tank wall temperature sensor 821 and a second molten salt temperature sensor 825; and the side wall of the second tested storage tank 2 is equipped with a second wall stress sensor. The device 829 includes a No. 2 tank bottom stress sensor 827 installed at the bottom of the No. 2 tested storage tank 2, a No. 2 molten salt inlet temperature sensor 726 installed at the input end of the No. 2 tested storage tank 2, a No. 3 wall temperature sensor 831 and a No. 3 molten salt temperature sensor 835 installed at the top of the No. 3 tested storage tank 3, a No. 3 wall stress sensor 839 installed on the side wall of the No. 3 tested storage tank 3, a No. 3 tank bottom stress sensor 837 installed at the bottom of the No. 3 tested storage tank 3, and a No. 3 molten salt inlet temperature sensor 736 installed at the input end of the No. 3 tested storage tank 3.

[0052] like Figure 1 As shown, the first test tank 1 is also equipped with a first level gauge 813, the second test tank 2 is also equipped with a second level gauge 823, and the third test tank is also equipped with a third level gauge 833.

[0053] like Figure 1 As shown, the circulation device is a molten salt pump, which includes a first molten salt pump 12 installed at the output end of the first test tank 1, a second molten salt pump 22 installed at the output end of the second test tank 2, and a third molten salt pump 32 installed at the output end of the third test tank 3.

[0054] like Figure 1 As shown, the temperature adjustment device includes a heater 5 for increasing the temperature of the molten salt, a cooler 6 for decreasing the temperature of the molten salt, and a straight pipe for directly transporting the molten salt. The molten salt output pipe connects the inlet end of the heater 5, the inlet end of the cooler 6, and the inlet end of the straight pipe. The molten salt input pipe connects the outlet end of the heater 5, the outlet end of the cooler 6, and the outlet end of the straight pipe. The inlet end of the heater 5 is equipped with a heater inlet shut-off valve 51, and the outlet end of the heater 5 is equipped with a heater outlet shut-off valve 52. The inlet end of the cooler 6 is equipped with a cooler inlet shut-off valve 61, and the outlet end of the cooler 6 is equipped with a cooler outlet shut-off valve 62. A straight pipe shut-off valve 72 is provided on the straight pipe. In one embodiment, the heater 5 is an electric heater, and the cooler 6 is a coil-type cooler.

[0055] The temperature adjustment device can also be a container with adjustable internal temperature.

[0056] like Figure 1 As shown, the present invention also includes a salt-free tank 4, the input end of which is connected to the output end of the molten salt storage tank under test, the output end of which is connected to the input end of the molten salt temperature adjustment device, the pipe connecting the salt-free tank 4 belongs to the pipe 7, a salt-free pump 42 is provided at the output end of the salt-free tank 4, a salt-free tank level gauge 843 and a salt-free molten salt temperature sensor 845 for measuring the temperature of the molten salt inside the salt-free tank 4 are provided on the top of the salt-free tank 4, and the salt-free tank 4 is also provided with a salt-free tank heater 44.

[0057] like Figure 1 As shown, the pipeline 7 is equipped with a flow regulating valve 71, a first pipeline thermocouple 73, a flow meter 74, a second pipeline thermocouple 75, and a pressure transmitter 76. The pressure transmitter 76 can increase the flow rate of the test molten salt in the pipeline 7 and shorten the test time.

[0058] The present invention also provides a method for testing molten salt storage tanks, based on the above-mentioned molten salt storage tank testing device, comprising the following steps:

[0059] S1. The molten salt is fed into the molten salt temperature adjustment device, and the test molten salt is heated and cooled according to the test requirements to form test molten salt. The test molten salt is then output to the test molten salt storage tank, or the molten salt that enters the molten salt temperature adjustment device is directly output as test molten salt to the test molten salt storage tank.

[0060] S2. Start the molten salt circulation device and adjust the opening and closing state of the shut-off valve so that the test molten salt obtained in S1 enters the target molten salt storage tank.

[0061] S3. The test molten salt circulates between the molten salt temperature adjustment device and the target molten salt storage tank. The molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt and records the temperature data and stress data of the target molten salt storage tank.

[0062] S4. End the test and empty the test molten salt in the molten salt circulation device and the molten salt storage tank.

[0063] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A testing device for a molten salt storage tank, characterized in that: It includes a molten salt temperature adjustment device, a molten salt circulation device, and a molten salt storage tank under test. The output end of the molten salt temperature adjustment device is connected to the input end of the molten salt storage tank under test through a molten salt input pipe, and the input end of the molten salt temperature adjustment device is connected to the output end of the molten salt storage tank under test through a molten salt output pipe. The molten salt circulation device is connected to the molten salt input pipe or the molten salt output pipe; The molten salt storage tank under test is equipped with a temperature sensor, which includes a tank wall temperature sensor for measuring the inner wall temperature of the molten salt storage tank under test and a molten salt temperature sensor for measuring the molten salt temperature inside the molten salt storage tank under test. The molten salt storage tank under test is also equipped with a stress sensor for measuring the stress on the outer wall of the tank. The molten salt input pipeline includes a main inlet pipe and inlet branch pipes connected to the main inlet pipe. Different inlet branch pipes connect to the input ends of different molten salt storage tanks under test. The molten salt output pipeline includes a main outlet pipe and outlet branch pipes connected to the main outlet pipe. Different outlet branch pipes connect to the output ends of different molten salt storage tanks under test. Each outlet branch pipe is equipped with a molten salt inlet shut-off valve for adjusting the molten salt flow rate into the tank, and each outlet branch pipe is equipped with a molten salt outlet shut-off valve for adjusting the molten salt flow rate into the storage tank. The molten salt storage tanks under test include Tank No. 1 (1), Tank No. 2 (2), and Tank No.

3. The tested storage tank (3) includes a first inlet shut-off valve (718) installed at the input end of the first tested storage tank (1), a second inlet shut-off valve (728) installed at the input end of the second tested storage tank (2), and a third inlet shut-off valve (738) installed at the input end of the third tested storage tank (3). The molten salt outlet shut-off valve includes a first outlet shut-off valve (712) installed at the output end of the first tested storage tank (1), a second outlet shut-off valve (722) installed at the output end of the second tested storage tank (2), and a third outlet shut-off valve (738) installed at the output end of the third tested storage tank (3). The third outlet shut-off valve (732) at the end, the circulation device is a molten salt pump, the molten salt pump includes a first molten salt pump (12) installed at the output end of the first tested storage tank (1), a second molten salt pump (22) installed at the output end of the second tested storage tank (2), and a third molten salt pump (32) installed at the output end of the third tested storage tank (3), the temperature adjustment device includes a heater (5) for increasing the temperature of the molten salt passing through, a cooler (6) for decreasing the temperature of the molten salt passing through, and a straight pipe for directly transporting the molten salt, the molten salt output pipe is connected to the feed end of the heater (5), the... The feed end of the cooler (6) and the feed end of the straight pipe are connected. The molten salt input pipe is connected to the discharge end of the heater (5), the discharge end of the cooler (6) and the discharge end of the straight pipe. The feed end of the heater (5) is equipped with a heater feed end shut-off valve (51). The discharge end of the heater (5) is equipped with a heater discharge end shut-off valve (52). The feed end of the cooler (6) is equipped with a cooler feed end shut-off valve (61). The discharge end of the cooler (6) is equipped with a cooler discharge end shut-off valve (62). The straight pipe is equipped with a straight pipe shut-off valve (72).

2. The molten salt storage tank testing device according to claim 1, characterized in that: The stress sensor includes a tank wall stress sensor for measuring the side wall stress of the molten salt storage tank under test and a tank bottom stress sensor for measuring the bottom stress of the molten salt storage tank under test.

3. The molten salt storage tank testing device according to claim 1, characterized in that: The top of the No. 1 test tank (1) is equipped with a No. 1 wall temperature sensor (811) and a No. 1 molten salt temperature sensor (815), the side wall of the No. 1 test tank (1) is equipped with a No. 1 wall stress sensor (819), and the bottom of the No. 1 test tank (1) is equipped with a No. 1 tank bottom stress sensor (817). The top of the No. 2 test tank (2) is equipped with a No. 2 tank wall temperature sensor (821) and a No. 2 molten salt temperature sensor (825), the side wall of the No. 2 test tank (2) is equipped with a No. 2 wall stress sensor (829), and the bottom of the No. 2 test tank (2) is equipped with a No. 2 tank bottom stress sensor (827). The top of the No. 3 test tank (3) is equipped with a No. 3 wall temperature sensor (831) and a No. 3 molten salt temperature sensor (835), the side wall of the No. 3 test tank (3) is equipped with a No. 3 wall stress sensor (839), and the bottom of the No. 3 test tank (3) is equipped with a No. 3 tank bottom stress sensor (837). The first test tank (1) is also equipped with a first level gauge (813), the second test tank (2) is also equipped with a second level gauge (823), and the third test tank (3) is also equipped with a third level gauge (833).

4. The molten salt storage tank testing device according to claim 1, characterized in that: It also includes a salt-repellent tank (4), the input end of which is connected to the output end of the molten salt storage tank under test, and the output end of which is connected to the input end of the molten salt temperature adjustment device; A salt-free pump (42) is provided at the output end of the salt-free tank (4), a salt-free tank level gauge (843) and a salt-free molten salt temperature sensor (845) for measuring the temperature of the molten salt in the salt-free tank (4) are provided at the top of the salt-free tank (4), and a salt-free tank heater (44) is also provided in the salt-free tank (4).

5. A testing method for molten salt storage tanks, characterized in that: The molten salt storage tank testing apparatus according to any one of claims 1-4 includes the following steps: S1. The molten salt is fed into the molten salt temperature adjustment device, and the test molten salt is heated and cooled according to the test requirements to form test molten salt. The test molten salt is then output to the test molten salt storage tank, or the molten salt that enters the molten salt temperature adjustment device is directly output as test molten salt to the test molten salt storage tank. S2. Start the molten salt circulation device and adjust the opening and closing state of the shut-off valve so that the test molten salt obtained in S1 enters the target molten salt storage tank. S3. The test molten salt circulates between the molten salt temperature adjustment device and the target molten salt storage tank. The molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt and records the temperature data and stress data of the target molten salt storage tank. S4. End the test and empty the test molten salt in the molten salt circulation device and the molten salt storage tank.

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