Molten salt storage tank testing device and molten salt storage tank testing method

Abstract

The invention 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 tested molten salt storage tank, the output end of the molten salt temperature adjusting device is communicated with the input end of the tested molten salt storage tank through a molten salt input pipeline; the input end of the fused salt temperature adjusting device is communicated with the output end of the tested fused salt storage tank through a fused salt output pipeline, the fused salt circulating device is connected with a fused salt input pipeline or the fused salt output pipeline, and the tested fused salt storage tank is provided with a temperature sensor and a stress sensor. According to the molten salt storage tank testing device provided by the invention, the tested molten salt at different temperatures continuously circulates in the tested molten salt storage tank, so that the effect that the internal temperature of the tested molten salt storage tank is alternately changed is realized, and the temperature of the inner wall and the stress of the outer wall of the tested molten salt storage tank are monitored; the stress change caused by the temperature change and the liquid level height change at the measuring point can be obtained, the thermal fatigue rule of the measured fused salt storage tank is obtained, and the thermodynamic property of the measured fused salt storage tank is mastered.

Description

Technical Field

[0001] The 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 Art

[0002] Solar thermal power generation, with its advantage of being able to store heat on a large scale for a long time, will play an important role in building a new power system based on green energy. Molten salt heat storage is the mainstream heat storage technology of existing commercial solar thermal power plants. Molten salt storage tanks are one of the key components of the heat storage system. Their operating temperature reaches 565°C. During operation, they may leak due to corrosion, thermal cycle fatigue, weld defects, etc., which will cause huge economic losses to the power station. Therefore, various performance tests on high-temperature molten salt storage tanks and mastering the thermodynamic characteristics of the storage tanks are crucial to ensure the operational reliability of high-temperature molten salt storage tanks.

[0003] In the prior art, the temperature distribution of the tank and the molten salt is tested by installing temperature sensors in the molten salt and the tank body, and the thermal characteristics of the tank during operation are mastered, but there is still a lack of research on the test system and test methods for the mechanical characteristics of the tank. Mechanical characteristics are one of the important factors in studying the failure of the system such as leakage caused by thermal fatigue of the molten salt tank, so it is very necessary to comprehensively study the test methods and test systems for the thermodynamic characteristics of the molten salt tank. Summary of the invention

[0004] The purpose of the present invention is to provide a molten salt storage tank testing device to solve the problems existing in the above-mentioned prior art, so that test molten salts of different temperatures are continuously circulated in the molten salt storage tank to be tested, so as to achieve the effect of alternating temperature changes inside the molten salt storage tank to be tested, and at the same time, the height of the test molten salt in the molten salt storage tank to be tested can also be adjusted. By monitoring the inner wall temperature and outer wall stress of 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, and then the thermal fatigue law of the molten salt storage tank to be tested can be obtained, and the thermodynamic characteristics of the molten salt storage tank to be tested can be mastered.

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

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a molten salt storage tank testing device, comprising a molten salt temperature adjusting device, a molten salt circulation device and a molten salt storage tank to be tested, wherein the output end of the molten salt temperature adjusting device is connected to the input end of the molten salt storage tank to be tested through a molten salt input pipeline, and the input end of the molten salt temperature adjusting device is connected to the output end of the molten salt storage tank to be tested through a molten salt output pipeline;

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

[0009] The molten salt storage tank to be measured is provided with a temperature sensor, and the temperature sensor includes a tank wall temperature sensor for measuring the inner wall temperature of the molten salt storage tank to be measured and a molten salt temperature sensor for measuring the temperature of the molten salt in the molten salt storage tank to be measured;

[0010] The molten salt storage tank to be measured is also provided with a stress sensor for measuring the stress of the outer wall of the tank body.

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

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

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

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

[0015] Preferably, the tested molten salt storage tanks include a No. 1 tested storage tank, a No. 2 tested storage tank and a No. 3 tested storage tank, and the molten salt inlet stop valves include a No. 1 inlet stop valve arranged at the input end of the No. 1 tested storage tank, a No. 2 inlet stop valve arranged at the input end of the No. 2 tested storage tank, and a No. 3 inlet stop valve arranged at the input end of the No. 3 tested storage tank;

[0016] The molten salt outlet stop valve includes a No. 1 outlet stop valve arranged at the output end of the No. 1 tested storage tank, a No. 2 outlet stop valve arranged at the output end of the No. 2 tested storage tank, and a No. 3 outlet stop valve arranged at the output end of the No. 3 tested storage tank.

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

[0018] A No. 2 tank wall temperature sensor and a No. 2 molten salt temperature sensor are arranged on the top of the No. 2 tested storage tank, a No. 2 wall stress sensor is arranged on the side wall of the No. 2 tested storage tank, and a No. 2 tank bottom stress sensor is arranged on the bottom of the No. 2 tested storage tank;

[0019] A No. 3 wall temperature sensor and a No. 3 molten salt temperature sensor are arranged on the top of the No. 3 tested storage tank, a No. 3 wall stress sensor is arranged on the side wall of the No. 3 tested storage tank, and a No. 3 tank bottom stress sensor is arranged on the bottom of the No. 3 tested storage tank;

[0020] The measured storage tank No. 1 is also provided with a No. 1 liquid level gauge, the measured storage tank No. 2 is also provided with a No. 2 liquid level gauge, and the measured storage tank No. 3 is also provided with a No. 3 liquid level gauge.

[0021] Preferably, the circulation device is a molten salt pump, which includes a No. 1 molten salt pump arranged at the output end of the No. 1 tested storage tank, a No. 2 molten salt pump arranged at the output end of the No. 2 tested storage tank, and a No. 3 molten salt pump arranged at the output end of the No. 3 tested storage tank.

[0022] Preferably, the temperature adjustment device comprises a heater for increasing the temperature of the molten salt, a cooler for reducing the temperature of the molten salt, and a straight pipe for directly transporting the molten salt, the molten salt output pipeline is connected with the feed end of the heater, the feed end of the cooler and the feed end of the straight pipe, and the molten salt input pipeline is connected with the discharge end of the heater, the discharge end of the cooler and the discharge end of the straight pipe;

[0023] The feed end of the heater is provided with a heater feed end stop valve, the discharge end of the heater is provided with a heater discharge end stop valve, the feed end of the cooler is provided with a cooler feed end stop valve, the discharge end of the cooler is provided with a cooler discharge end stop valve, and the straight-through pipe is provided with a straight-through pipe stop valve.

[0024] Preferably, it also includes a salt draining tank, the input end of the salt draining tank is connected to the output end of the molten salt storage tank to be measured, and the output end of the salt draining tank is connected to the input end of the molten salt temperature adjustment device;

[0025] A salt diversion pump is arranged at the output end of the salt diversion tank, a salt diversion tank level gauge and a salt diversion molten salt temperature sensor for measuring the temperature of the molten salt in the salt diversion tank are arranged on the top of the salt diversion tank, and the salt diversion tank is also provided with a salt diversion tank heater.

[0026] The present invention also provides a molten salt storage tank testing method, based on the above 2 molten salt storage tank testing devices, comprising the following steps:

[0027] S1, transporting the molten salt into the molten salt temperature adjustment device, heating and cooling the test molten salt used for the test according to the test requirements to form the test molten salt and outputting the test molten salt to the molten salt tank to be tested, or directly outputting the molten salt entering the molten salt temperature adjustment device as the test molten salt to the molten salt tank to be tested;

[0028] S2, start the molten salt circulation device, and adjust the opening and closing state of the stop 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 to be tested, and the molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt, and simultaneously records the temperature data and stress data of the molten salt storage tank to be tested;

[0030] S4, ending the test, and draining the test molten salt in the molten salt circulation device and the tested molten salt storage tank.

[0031] Compared with the prior art, the present invention has achieved the following technical effects:

[0032] The present invention provides a molten salt storage tank testing device, which enables test molten salts of different temperatures to continuously circulate in the tested molten salt storage tank, thereby achieving the effect of alternating temperature changes inside the tested molten salt storage tank. At the same time, the height of the test molten salt in the tested molten salt storage tank can also be adjusted. By monitoring the inner wall temperature and outer wall stress of the tested molten salt storage tank, the stress changes at the measuring point caused by the temperature changes and the liquid level changes can be obtained, and then the thermal fatigue law of the tested molten salt storage tank can be obtained, and the thermodynamic characteristics of the tested molten salt storage tank can be mastered.

[0033] The present invention also provides a molten salt storage tank testing method. Based on the above-mentioned molten salt storage tank testing device, the alternating temperature and alternating liquid level height of the molten salt storage tank under test can be tested, and the temperature and stress data of the molten salt storage tank under test can be collected 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. The present invention can test multiple independent molten salt storage tanks to be tested, and can test a specific molten salt storage tank to be tested by adjusting the opening and closing states of each stop valve and the flow rate of each molten salt pump;

[0036] 2. In the present invention, the positions and numbers of the temperature measuring points and stress measuring points on the tested molten salt storage tank can be adjusted according to the test requirements, so as to obtain comprehensive data of the tested molten salt storage tank;

[0037] 3. In the present invention, the heater, cooler and straight-through pipe are independently arranged, 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, allows the test molten salt to change temperature faster during transportation, and produces a reliable alternating temperature effect in the tested molten salt storage tank;

[0038] 4. The present invention is provided with a salt draining tank for storing molten salt. When no test is performed, the molten salt is stored in the salt draining tank. The salt draining tank heater can keep the molten salt in the salt draining tank in a flowing molten state, ensuring that the molten salt in the salt draining tank can be put into the test at any time. The molten salt temperature adjustment device and the test molten salt in the tested molten salt storage tank can also be quickly recovered to the salt draining tank after the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0041] Figure 2 It is a schematic diagram of the direction of the tested storage tank in an embodiment of the present invention.

[0042] Among them, 1. No. 1 tested storage tank; 2. No. 2 tested storage tank; 3. No. 3 tested storage tank; 4. Salt drain tank; 5. Heater; 6. Cooler; 7. Pipeline; 12. No. 1 molten salt pump; 22. No. 2 molten salt pump; 32. No. 3 molten salt pump; 42. Salt drain pump; 44. Salt drain tank heater; 51. Heater inlet stop valve; 52. Heater outlet stop valve; 61. Cooler inlet stop valve; 62. Cooler outlet stop valve; 71. Flow control valve ; 72, stop valve; 73, pipeline thermocouple; 74, flow meter; 75, No. 2 pipeline thermocouple; 76, pressure transmitter; 712, No. 1 tank molten salt outlet stop valve; 714, No. 1 tank salt drain valve; 716, No. 1 molten salt inlet temperature sensor; 718, No. 1 tank molten salt inlet stop valve; 722, No. 2 tank molten salt outlet stop valve; 724, No. 2 tank salt drain valve; 726, No. 2 molten salt inlet temperature sensor; 728, No. 2 tank molten salt inlet stop valve ; 734, No. 3 tank salt drain valve; 732, No. 3 tank molten salt outlet stop valve; 736, No. 3 molten salt inlet temperature sensor; 738, No. 3 tank molten salt inlet stop valve; 742, salt drain tank molten salt outlet stop valve; 746, salt drain molten salt inlet temperature sensor; 811, No. 1 tank wall temperature sensor; 813, No. 1 tank liquid level gauge; 815, No. 1 molten salt temperature sensor; 817, No. 1 tank bottom stress sensor; 819, No. 1 tank wall stress sensor; 8 21. No. 2 tank wall temperature sensor; 823. No. 2 tank level gauge; 825. No. 2 molten salt temperature sensor; 827. No. 2 tank bottom stress sensor; 829. No. 2 tank wall stress sensor; 831. No. 3 tank wall temperature sensor; 833. No. 3 tank level gauge; 835. No. 3 molten salt temperature sensor; 837. No. 3 tank bottom stress sensor; 839. No. 3 tank wall stress sensor; 843. Drainage tank level gauge; 845. Drainage molten salt temperature sensor. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0044] The present invention provides a molten salt storage tank testing device, which enables test molten salts of different temperatures to circulate continuously in the tested molten salt storage tank, thereby achieving the effect of alternating temperature changes inside the tested molten salt storage tank, and at the same time, the height of the test molten salt in the tested molten salt storage tank can also be adjusted. By monitoring the inner wall temperature and outer wall stress of the tested molten salt storage tank, the stress changes at the measuring point caused by the temperature changes and the liquid level changes can be obtained, and then the thermal fatigue law of the tested molten salt storage tank can be obtained, and the thermodynamic characteristics of the tested molten salt storage tank can be mastered.

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

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is 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, which is characterized in that it includes a molten salt temperature adjusting device, a molten salt circulation device and a molten salt storage tank to be tested, the output end of the molten salt temperature adjusting device is connected to 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 to the output end of the molten salt storage tank to be tested through a molten salt output pipeline, the molten salt circulation device is connected to the molten salt input pipeline or the molten salt output pipeline, and the molten salt input pipeline and the molten salt output pipeline together constitute a partial structure of pipeline 7.

[0048] like Figure 1 As shown, the molten salt storage tank to be measured is provided with a temperature sensor, and the temperature sensor includes a tank wall temperature sensor for measuring the inner wall temperature of the molten salt storage tank to be measured and a molten salt temperature sensor for measuring the temperature of the molten salt in the molten salt storage tank to be measured. The inner wall of the molten salt storage tank to be measured includes a top wall, a side wall and a bottom wall. The temperature measuring point is selected on the inner wall of the molten salt storage tank to be measured according to needs before measurement, and the temperature sensor is installed at the selected position. The molten salt storage tank to be measured is also provided with a stress sensor for measuring the outer wall stress of the tank body, and the stress sensor includes a tank wall stress sensor for measuring the side wall stress of the molten salt storage tank to be measured and a tank bottom stress sensor for measuring the bottom stress of the molten salt storage tank to be measured. The stress measuring point is selected on the outer wall of the molten salt storage tank to be measured according to needs before measurement, and the stress sensor is installed at the selected position, as shown in FIG. Figure 2 As shown, in one embodiment, the coordinates of the tank body are divided into three directions: axial Y, circumferential C and radial X, and the values ​​of the stress measurement points are selected as three-parameter coordinate points.

[0049] like Figure 1As shown, the molten salt input pipeline includes a feed main pipe and a feed branch pipe connected to the feed main pipe, different feed branches are connected to different input ends of the molten salt storage tanks to be measured, and the molten salt output pipeline includes a discharge main pipe and a feed branch pipe connected to the discharge main pipe, different discharge branches are connected to different output ends of the molten salt storage tanks to be measured. In order to well control the inlet and outlet flow rates of the molten salt storage tanks to be measured, each of the feed branch pipes is provided with a molten salt inlet stop valve for adjusting the flow rate of molten salt entering the tank, and each of the discharge branch pipes is provided with a molten salt outlet stop valve for adjusting the flow rate of molten salt out of the storage tank.

[0050] like Figure 1 As shown, in one embodiment, the tested molten salt storage tanks include a tested tank No. 1 1, a tested tank No. 2 2 and a tested tank No. 3 3, the molten salt inlet stop valve includes a No. 1 inlet stop valve 718 arranged at the input end of the tested tank No. 1, a No. 2 inlet stop valve 728 arranged at the input end of the tested tank No. 2 2 and a No. 3 inlet stop valve 738 arranged at the input end of the tested tank No. 3 3, the molten salt outlet stop valve includes a No. 1 outlet stop valve 712 arranged at the output end of the tested tank No. 1 1, a No. 2 outlet stop valve 722 arranged at the output end of the tested tank No. 2 2 and a No. 3 outlet stop valve 732 arranged at the output end of the tested tank No. 3 3.

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

[0052] like Figure 1 As shown, the first tested storage tank 1 is further provided with a first liquid level gauge 813 , the second tested storage tank 2 is further provided with a second liquid level gauge 823 , and the third tested storage tank is further provided with a third liquid level gauge 833 .

[0053] like Figure 1 As shown, the circulation device is a molten salt pump, which includes a No. 1 molten salt pump 12 arranged at the output end of the No. 1 tested storage tank 1, a No. 2 molten salt pump 22 arranged at the output end of the No. 2 tested storage tank 2, and a No. 3 molten salt pump 32 arranged at the output end of the No. 3 tested storage 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 reducing the temperature of the molten salt and a straight pipe for directly transporting the molten salt, the molten salt output pipeline is connected with the feed end of the heater 5, the feed end of the cooler 6 and the feed end of the straight pipe, the molten salt input pipeline is connected with 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 provided with a heater feed end stop valve 51, the discharge end of the heater 5 is provided with a heater discharge end stop valve 52, the feed end of the cooler 6 is provided with a cooler feed end stop valve 61, the discharge end of the cooler 6 is provided with a cooler discharge end stop valve 62, and the straight pipe is provided with a straight pipe stop valve 72. In one embodiment, the heater 5 is an electric heater, and the cooler 6 is a coil cooler.

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

[0056] like Figure 1 As shown, the present invention also includes a salt draining tank 4, the input end of the salt draining tank 4 is connected to the output end of the molten salt storage tank to be measured, the output end of the salt draining tank 4 is connected to the input end of the molten salt temperature adjustment device, the pipeline connecting the salt draining tank 4 belongs to the pipeline 7, the output end of the salt draining tank 4 is provided with a salt draining pump 42, the top of the salt draining tank 4 is provided with a salt draining tank level meter 843 and a salt draining molten salt temperature sensor 845 for measuring the temperature of the molten salt in the salt draining tank 4, and the salt draining tank 4 is also provided with a salt draining tank heater 44.

[0057] like Figure 1 As shown, the pipeline 7 is provided with a flow regulating valve 71, a No. 1 pipeline thermocouple 73, a flow meter 74, a No. 2 pipeline thermocouple 75 and a pressure transmitter 76, wherein the pressure transmitter 76 can increase the flow velocity of the test molten salt in the pipeline 7 and shorten the test time.

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

[0059] S1, transporting the molten salt into the molten salt temperature adjustment device, heating and cooling the test molten salt used for the test according to the test requirements to form the test molten salt and outputting the test molten salt to the molten salt tank to be tested, or directly outputting the molten salt entering the molten salt temperature adjustment device as the test molten salt to the molten salt tank to be tested;

[0060] S2, start the molten salt circulation device, and adjust the opening and closing state of the stop 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 to be tested, and the molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt, and simultaneously records the temperature data and stress data of the molten salt storage tank to be tested;

[0062] S4, ending the test, and draining the test molten salt in the molten salt circulation device and the tested molten salt storage tank.

[0063] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. 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 to be measured, wherein the output end of the molten salt temperature adjustment device is connected to the input end of the molten salt storage tank to be measured through a molten salt input pipeline, and the input end of the molten salt temperature adjustment device is connected to the output end of the molten salt storage tank to be measured through a molten salt output pipeline; The molten salt circulation device is connected to the molten salt input pipeline or the molten salt output pipeline; The molten salt storage tank to be measured is provided with a temperature sensor, and the temperature sensor includes a tank wall temperature sensor for measuring the inner wall temperature of the molten salt storage tank to be measured and a molten salt temperature sensor for measuring the temperature of the molten salt in the molten salt storage tank to be measured; The molten salt storage tank to be measured is also provided with a stress sensor for measuring the stress of the outer wall of the tank body.

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

3. The molten salt storage tank testing device according to claim 1, characterized in that: The molten salt input pipeline includes a feed main pipe and a feed branch pipe connected to the feed main pipe, and different feed branches are connected to input ends of different molten salt storage tanks to be tested; The molten salt output pipeline includes a discharge main pipe and a discharge branch pipe connected to the discharge main pipe, and different discharge branch pipes are connected to output ends of different molten salt storage tanks to be tested.

4. The molten salt storage tank testing device according to claim 3 is characterized in that: Each of the discharge branch pipes is provided with a molten salt inlet stop valve for adjusting the flow rate of molten salt entering the tank, and each of the discharge branch pipes is provided with a molten salt outlet stop valve for adjusting the flow rate of molten salt in the storage tank.

5. The molten salt storage tank testing device according to claim 4, characterized in that: The tested molten salt storage tanks include a first tested storage tank (1), a second tested storage tank (2) and a third tested storage tank (3); the molten salt inlet stop valves include a first inlet stop valve (718) arranged at the input end of the first tested storage tank (1), a second inlet stop valve (728) arranged at the input end of the second tested storage tank (2) and a third inlet stop valve (738) arranged at the input end of the third tested storage tank (3); The molten salt outlet stop valve comprises a No. 1 outlet stop valve (712) arranged at the output end of the No. 1 tested storage tank (1), a No. 2 outlet stop valve (722) arranged at the output end of the No. 2 tested storage tank (2), and a No. 3 outlet stop valve (732) arranged at the output end of the No. 3 tested storage tank (3).

6. The molten salt tank testing device according to claim 5, characterized in that: A No. 1 wall temperature sensor (811) and a No. 1 molten salt temperature sensor (815) are arranged on the top of the No. 1 tested storage tank (1), a No. 1 wall stress sensor (819) is arranged on the side wall of the No. 1 tested storage tank (1), and a No. 1 tank bottom stress sensor (817) is arranged on the bottom of the No. 1 tested storage tank (1); A No. 2 tank wall temperature sensor (821) and a No. 2 molten salt temperature sensor (825) are arranged on the top of the No. 2 tested storage tank (2), a No. 2 wall stress sensor (829) is arranged on the side wall of the No. 2 tested storage tank (2), and a No. 2 tank bottom stress sensor (827) is arranged on the bottom of the No. 2 tested storage tank (2); A No. 3 wall temperature sensor (831) and a No. 3 molten salt temperature sensor (835) are arranged on the top of the No. 3 tested storage tank (3), a No. 3 wall stress sensor (839) is arranged on the side wall of the No. 3 tested storage tank (3), and a No. 3 tank bottom stress sensor (837) is arranged on the bottom of the No. 3 tested storage tank (3); The first storage tank (1) under test is also provided with a first liquid level gauge (813), the second storage tank (2) under test is also provided with a second liquid level gauge (823), and the third storage tank (833) under test is also provided with a third liquid level gauge (833).

7. The molten salt storage tank testing device according to claim 5, characterized in that: The circulation device is a molten salt pump, which comprises a No. 1 molten salt pump (12) arranged at the output end of the No. 1 tested storage tank (1), a No. 2 molten salt pump (22) arranged at the output end of the No. 2 tested storage tank (2), and a No. 3 molten salt pump (32) arranged at the output end of the No. 3 tested storage tank (3).

8. The molten salt storage tank testing device according to claim 1, characterized in that: The temperature adjustment device comprises a heater (5) for increasing the temperature of the molten salt, a cooler (6) for reducing the temperature of the molten salt, and a straight pipe for directly transporting the molten salt, wherein the molten salt output pipe is connected to the feed end of the heater (5), the feed end of the cooler (6), and the feed end of the straight pipe, and 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 provided with a heater feed end stop valve (51), the discharge end of the heater (5) is provided with a heater discharge end stop valve (52), the feed end of the cooler (6) is provided with a cooler feed end stop valve (61), the discharge end of the cooler (6) is provided with a cooler discharge end stop valve (62), and the straight-through pipe is provided with a straight-through pipe stop valve (72).

9. The molten salt storage tank testing device according to claim 1, characterized in that: It also includes a salt draining tank (4), the input end of the salt draining tank (4) is connected to the output end of the molten salt storage tank to be measured, and the output end of the salt draining tank (4) is connected to the input end of the molten salt temperature adjustment device; A salt diversion pump (42) is provided at the output end of the salt diversion tank (4), a salt diversion tank level meter (843) and a salt diversion molten salt temperature sensor (845) for measuring the temperature of molten salt in the salt diversion tank (4) are provided at the top of the salt diversion tank (4), and the salt diversion tank (4) is also provided with a salt diversion tank heater (44).

10. A molten salt storage tank testing method, characterized in that: The molten salt storage tank testing device according to any one of claims 1 to 9 comprises the following steps: S1, transporting the molten salt into the molten salt temperature adjustment device, heating and cooling the test molten salt used for the test according to the test requirements to form the test molten salt and outputting the test molten salt to the molten salt tank to be tested, or directly outputting the molten salt entering the molten salt temperature adjustment device as the test molten salt to the molten salt tank to be tested; S2, start the molten salt circulation device, and adjust the opening and closing state of the stop 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 to be tested, and the molten salt temperature adjustment device continuously adjusts the temperature of the test molten salt, and simultaneously records the temperature data and stress data of the molten salt storage tank to be tested; S4, ending the test, and draining the test molten salt in the molten salt circulation device and the tested molten salt storage tank.

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