Low-energy-consumption fused salt micro-channel heat exchanger performance test platform supporting long-time operation

Abstract

The utility model provides a low-energy-consumption fused salt micro-channel heat exchanger performance testing platform supporting long-time operation. The platform comprises a fused salt loop, a steam loop and a heat conduction oil heat storage loop. Wherein the steam loop can perform primary steam energy recovery, is led out from a steam side outlet of a tested fused salt micro-channel heat exchanger, is sequentially connected with a steam pipeline of the fused salt preheater, a steam pipeline of the steam-water-oil heat exchanger and the steam-water electric heater, and then is connected into a steam side inlet of the tested fused salt micro-channel heat exchanger; wherein the fused salt preheater is connected to a pipeline between a low-temperature fused salt tank and a high-temperature fused salt tank in the fused salt loop, and recycled steam energy is used for heating low-temperature fused salt; the heat conduction oil heat storage loop can conduct secondary energy recovery, and residual steam energy in the steam-water-oil heat exchanger is further recovered into heat conduction oil. According to the test platform, high-temperature steam energy discharged by the test platform can be fully recycled and utilized, and long-time operation of the test platform is realized while energy waste is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of molten salt heat storage, and specifically relates to a low-energy consumption molten salt microchannel heat exchanger performance test platform that supports long-term operation. Background Art

[0002] The molten salt steam generator in solar thermal power generation and molten salt heat storage is a key link in heat conversion. Among them, the microchannel heat exchanger has the characteristics of large heat exchange area per unit volume, compact structure, and excellent heat transfer performance. It can replace the shell and tube heat exchanger for heat exchange between molten salt and fluids such as steam and water, sCO2, etc. Building a heat exchanger performance test platform is very important in the design, production and experimental research of heat exchangers. The test platform for the heat transfer performance of molten salt microchannel heat exchangers is still imperfect and has the following problems:

[0003] 1) During the testing of microchannel heat exchangers and other forms of heat exchangers, the energy transferred from molten salt to steam is relatively large. The high-temperature steam discharged from the heat exchanger is directly cooled or emptied. There is a lack of energy recovery units, which causes the test platform to consume a lot of electricity and high operating costs during long-term operation.

[0004] 2) In the actual operation of the molten salt heat storage system, the operating conditions change frequently, and the heat exchanger works intermittently, such as running for 18 hours and shutting down for 6 hours in a day. The existing test system cannot perform performance tests on heat exchangers in long-term and periodic changes. Utility Model Content

[0005] In view of this, the utility model provides a low-energy molten salt microchannel heat exchanger performance test platform that supports long-term operation. It can fully recover and utilize the high-temperature steam energy discharged from the test platform, reduce the power consumption during the test process and periodic startup, and avoid the risk of overheating of the heat transfer oil when the test system is running for a long time, thereby realizing long-term operation of the test platform.

[0006] In order to solve the above technical problems, the utility model is implemented in this way.

[0007] The present disclosure provides a molten salt microchannel heat exchanger performance test platform, including a molten salt circuit, a steam circuit, a thermal oil heat storage circuit and a control module;

[0008] The molten salt loop is led out from the molten salt side outlet of the molten salt microchannel heat exchanger to be tested, connected to the low-temperature molten salt tank and the high-temperature molten salt tank in sequence, and then connected to the molten salt side inlet of the molten salt microchannel heat exchanger to be tested;

[0009] The steam loop is led out from the steam side outlet of the molten salt microchannel heat exchanger to be tested, and is connected to the steam side inlet of the molten salt microchannel heat exchanger to be tested after being connected in sequence to the steam pipeline of the molten salt preheater, the steam pipeline of the steam-water-oil heat exchanger, and the steam-water electric heater; the steam-water electric heater is connected to a softened water supply device; wherein the molten salt preheater is connected to the pipeline between the low-temperature molten salt tank and the high-temperature molten salt tank in the molten salt loop, and the recovered steam energy is used to heat the low-temperature molten salt;

[0010] The heat transfer oil heat storage loop is led out from the heat transfer oil side outlet of the steam-water-oil heat exchanger, connected to the heat transfer oil supply device and returned to the heat transfer oil side inlet of the steam-water-oil heat exchanger, and the remaining steam energy in the steam-water-oil heat exchanger is further recovered into the heat transfer oil;

[0011] The control module is connected to sensors in each circuit and uses the above-mentioned flow channel blockage condition determination method to determine the blockage condition.

[0012] Preferably, the volume of the high-temperature molten salt tank is smaller than the volume of the low-temperature molten salt tank.

[0013] Preferably, a molten salt inlet pressure gauge, a molten salt filter, a molten salt flowmeter and a molten salt inlet thermometer are sequentially arranged on the molten salt side inlet pipeline of the molten salt microchannel heat exchanger being tested, wherein the molten salt inlet pressure gauge is arranged upstream of the molten salt filter; a molten salt outlet thermometer and a molten salt outlet pressure gauge are sequentially arranged on the molten salt side outlet pipeline of the molten salt microchannel heat exchanger being tested; and the measuring points of the molten salt differential pressure gauge are respectively arranged on the molten salt side inlet pipeline and outlet pipeline of the molten salt microchannel heat exchanger being tested.

[0014] Preferably, a steam inlet pressure gauge, a steam filter, a steam flow meter and a steam inlet thermometer are sequentially arranged on the steam side inlet pipeline of the molten salt microchannel heat exchanger being tested, wherein the steam inlet pressure gauge is arranged upstream of the steam filter; a steam outlet thermometer and a steam outlet pressure gauge are sequentially arranged on the steam side outlet pipeline of the molten salt microchannel heat exchanger being tested; and the measuring points of the steam differential pressure gauge are respectively arranged on the steam side inlet pipeline and outlet pipeline of the molten salt microchannel heat exchanger being tested.

[0015] Preferably, a molten salt preheater steam flowmeter, a molten salt preheater steam inlet stop valve, and a test module steam outlet stop valve are provided on the steam circuit between the molten salt preheater and the steam side outlet of the molten salt microchannel heat exchanger under test; a test module steam inlet stop valve is provided on the steam circuit between the molten salt preheater and the steam side inlet of the molten salt microchannel heat exchanger under test.

[0016] Preferably, a molten salt preheater steam regulating valve is provided between the steam inlet pipeline and the steam outlet pipeline of the molten salt preheater to adjust the molten salt temperature at the outlet of the molten salt preheater.

[0017] Preferably, the outlet pipeline of the steam-water-oil heat exchanger is connected to a steam exhaust bypass and is provided with a steam exhaust valve.

[0018] Preferably, the steam-water electric heater is arranged on the steam side inlet pipeline of the molten salt microchannel heat exchanger under test, and is used to replenish the steam in the loop when the test platform is running, and control the softened water regulating valve to maintain the stability of the steam flow at the steam side inlet of the molten salt microchannel heat exchanger under test.

[0019] Preferably, when the steam-water-oil heat exchanger is restarted after the test platform is periodically shut down for rest, the heat stored in the heat transfer oil is used to heat the softened water to a steam state, preheating the steam pipeline and the molten salt microchannel heat exchanger under test.

[0020] Beneficial effects:

[0021] (1) The utility model sets a molten salt preheater between the low-temperature molten salt tank and the high-temperature molten salt tank. The molten salt preheater is part of the steam circuit. As the first recovery circuit, the high-temperature steam discharged from the molten salt microchannel heat exchanger under test is used to heat the low-temperature molten salt. By partially recovering the heat in the high-temperature steam, the power consumption of the heat exchanger during the long-term performance test is reduced, thereby reducing the operating cost of the test platform.

[0022] (2) The utility model sets up a heat transfer oil heat storage circuit based on a steam-water-oil heat exchanger as a second recovery circuit, which is used to transfer and store part of the heat in the molten salt preheater outlet steam and bypass steam into the heat transfer oil to achieve further energy recovery. At the same time, the design of this part can also heat the feed water during the periodic startup of the test system to further reduce the energy consumption of the system.

[0023] (3) The utility model is designed with two-stage energy recovery and utilization, which can realize long-term intermittent operation of the test platform. In this process, sensors can be used to collect changes in the inlet and outlet parameters of the molten salt microchannel heat exchanger during long-term operation, which provides a data basis for the structural optimization design of the molten salt microchannel heat exchanger and the design of key life indicators during actual operation, thereby improving the reliability and safety of the actual operation of the molten salt microchannel heat exchanger.

[0024] (4) In a preferred embodiment, a large-volume low-temperature molten salt tank is used to store molten salt, and a small-volume high-temperature molten salt tank is used to adjust the molten salt flow entering the heat exchanger to be tested, thereby adjusting the liquid level height in the high-temperature molten salt tank to be constant, thereby reducing the storage cost of the high-temperature molten salt and the heat loss during the storage process.

[0025] (5) The present invention can avoid the risk of overheating of the thermal oil during long-term operation of the test system by providing a molten salt preheater steam regulating valve, a thermal oil regulating valve, a steam drain valve, a softened water regulating valve, and a steam-water electric heater.

[0026] Among them, adjusting the steam regulating valve of the molten salt preheater can increase the steam flow entering the molten salt preheater, increase the heat transfer of steam to the low-temperature molten salt, and reduce the steam side inlet temperature of the steam-water-oil heat exchanger; adjusting the thermal oil regulating valve can increase the inlet flow of the thermal oil side of the steam-water-oil heat exchanger to reduce the thermal oil outlet temperature of the steam-water-oil heat exchanger; when the thermal oil outlet temperature reaches the threshold, the thermal oil regulating valve is closed and the steam drain valve is opened to discharge the high-temperature steam that has not been fully cooled in the pipeline; in the above process, the power of the electric heater in the high-temperature molten salt tank is synchronously adjusted to ensure that the inlet temperature of the molten salt side of the heat exchanger to be tested is constant; and the opening of the softened water regulating valve and the power of the steam-water electric heater are adjusted to maintain the inlet flow and temperature of the steam side of the heat exchanger to be tested stable, so as to avoid the risk of thermal oil overheating when the test system is running for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the performance test platform of the molten salt microchannel heat exchanger of the utility model;

[0028] Figure 2 This is a schematic diagram of the sensor arrangement on the microchannel heat exchanger connecting pipeline in the molten salt microchannel heat exchanger performance test platform of the utility model. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] The utility model provides a low-energy consumption molten salt microchannel heat exchanger performance test platform that supports long-term operation. A two-stage energy recovery is designed to reduce the power consumption during the test process and periodic startup, and avoid the risk of overheating of the heat transfer oil when the test system is running for a long time, thereby achieving long-term operation of the test platform.

[0031] like Figure 1 As shown, the molten salt microchannel heat exchanger performance test platform includes a molten salt circuit, a steam circuit, a thermal oil heat storage circuit and a control module. In the utility model, the steam circuit includes a primary energy recovery device, and the thermal oil heat storage circuit is a secondary energy recovery device.

[0032] Molten salt circuit: Starting from the molten salt side outlet of the molten salt microchannel heat exchanger 1 under test, the pipeline is connected to the low-temperature molten salt tank 2, the molten salt preheater 4 (also belongs to the steam circuit), and the high-temperature molten salt tank 6 in sequence, and then connected to the molten salt side inlet of the molten salt microchannel heat exchanger 1 under test. The molten salt main line flowmeter 5 is set on the outlet pipeline of the molten salt preheater 4. The test module molten salt inlet stop valve 8 and the test module molten salt outlet stop valve 9 are respectively set on the molten salt side inlet and outlet pipelines of the molten salt microchannel heat exchanger 1 under test, and their function is to connect / isolate the molten salt microchannel heat exchanger 1 under test with the test platform during the operation / stop of the test platform.

[0033] The low-temperature molten salt tank 2 is connected to the molten salt side outlet of the molten salt microchannel heat exchanger 1 under test. The low-temperature molten salt after heat exchange flows into and is stored in the tank body. The variable power resistance wire heater and thermometer built into the low-temperature molten salt tank 2 maintain the constant temperature of the molten salt in the tank. The variable frequency submerged molten salt pump built into the low-temperature molten salt tank 2 is used to pump the low-temperature molten salt into the main line. The main line connected to the low-temperature molten salt tank 2 is provided with a bypass line, and the bypass line is provided with a low-temperature molten salt tank bypass regulating valve 3, which is used to control the molten salt flow rate entering the molten salt preheater 4 in the main line, and automatically adjust according to the liquid level height of the high-temperature molten salt tank 6 and the indication of the molten salt main line flowmeter 5.

[0034] The molten salt preheater 4 is arranged on the outlet main line of the low-temperature molten salt tank 2. The molten salt preheater 4 is the main component of the steam circuit. The energy of the molten salt preheater 4 comes from the high-temperature steam discharged from the tested molten salt microchannel heat exchanger 1. The function of the molten salt preheater 4 is to use the high-temperature steam discharged from the tested molten salt microchannel heat exchanger 1 to heat the low-temperature molten salt, and to reduce the energy consumption of the electric heater during the operation of the test platform by partially recovering the heat in the high-temperature steam.

[0035] The high-temperature molten salt tank 6 uses a small tank to store a small amount of high-temperature molten salt, the purpose of which is to reduce the electric energy consumed to maintain the high temperature of the molten salt. The variable power resistance wire heater and thermometer built into the high-temperature molten salt tank 6 are used to maintain the constant temperature of the molten salt in the tank. The variable frequency submerged molten salt pump built into the high-temperature molten salt tank 6 is used to pump the high-temperature molten salt into the main pipeline. The main pipeline connected to the high-temperature molten salt tank 6 is provided with a bypass pipeline, and the bypass pipeline is provided with a molten salt regulating valve 7, which is used to adjust the molten salt flow rate returning to the high-temperature molten salt tank 6 according to the molten salt flowmeter 104, so as to accurately control the molten salt flow rate entering the molten salt microchannel heat exchanger 1 under test.

[0036] Various sensors are arranged on the outlet pipe and inlet pipe of the molten salt side of the tested molten salt microchannel heat exchanger 1. Figure 2 As shown, the inlet pipeline of the molten salt side of the tested molten salt microchannel heat exchanger 1 is sequentially provided with a molten salt inlet pressure gauge 102, a molten salt filter 103, a molten salt flowmeter 104 and a molten salt inlet thermometer 105, wherein the molten salt inlet pressure gauge 102 is provided upstream of the molten salt filter 103; the outlet pipeline of the molten salt side is sequentially provided with a molten salt outlet thermometer 107 and a molten salt outlet pressure gauge 108. The measuring points of the molten salt differential pressure gauge 106 are respectively provided on the inlet pipeline and the outlet pipeline of the molten salt side of the tested molten salt microchannel heat exchanger 1, so as to obtain the inlet and outlet pressure difference of the molten salt side of the tested molten salt microchannel heat exchanger.

[0037] The steam circuit of the utility model is as follows: starting from the steam side outlet of the tested molten salt microchannel heat exchanger 1, the pipeline is connected in sequence to the test module steam outlet stop valve 10, the molten salt preheater steam inlet stop valve 11, the molten salt preheater steam flowmeter 12, the molten salt preheater 4 steam side, the steam pipeline of the steam-water-oil heat exchanger 14, the steam-water electric heater 15, the test module steam inlet stop valve 16, and then connected to the steam side inlet of the tested molten salt microchannel heat exchanger 1. It can be seen that the steam inlet of the molten salt preheater 4 is connected to the steam side outlet of the tested molten salt microchannel heat exchanger 1, and the steam-water-oil heat exchanger 14 is connected to the steam outlet of the molten salt preheater 4 and the steam side inlet of the tested molten salt microchannel heat exchanger 1, thereby forming a steam circulation loop. The high-temperature steam is used in the molten salt preheater 4, and the remaining steam energy will be transferred to the heat transfer oil heat storage circuit in the steam-water-oil heat exchanger 14.

[0038] The molten salt preheater steam inlet stop valve 11 and the molten salt preheater steam flow meter 12 are sequentially arranged on the steam side inlet pipeline of the molten salt preheater 4. The inlet pipeline of the molten salt preheater steam inlet stop valve 11 is connected to the steam outlet pipeline of the molten salt preheater 4. A molten salt preheater steam regulating valve 13 is arranged between the steam inlet pipeline and the steam outlet pipeline of the molten salt preheater 4, which is used to control the steam flow entering the molten salt preheater to adjust the molten salt temperature at the preheater outlet.

[0039] The function of the steam-water-oil heat exchanger 14 is to transfer and store part of the heat in the outlet steam and bypass steam of the molten salt preheater 4 into the heat transfer oil to realize energy recovery, and to heat the feed water during the periodic startup of the test system to reduce the energy consumption of the system. The outlet pipeline of the steam-water-oil heat exchanger 14 is connected to a steam exhaust bypass, and is provided with a steam exhaust valve 17, which is used to discharge excess steam in the circuit when the system stops or the heat transfer oil overheats. The steam-water-oil heat exchanger 14 is provided with a softened water bypass, which is connected to a softened water supply device 18. When the system is started, the water supply stop valve 20 is opened to inject softened water into the steam-water-oil heat exchanger 14 to heat the softened water.

[0040] The steam-water electric heater 15 is arranged on the steam side inlet pipeline of the tested molten salt microchannel heat exchanger 1, and is used to maintain a constant temperature of the steam entering the tested molten salt microchannel heat exchanger 1. The steam-water electric heater 15 is also connected to the softened water supply device 18, and its function is to supplement the steam in the loop when the test platform is running, and control the softened water regulating valve 19 to maintain the stability of the steam flow at the inlet of the tested molten salt microchannel heat exchanger 1.

[0041] The test module steam inlet stop valve 16 and the test module steam outlet stop valve 10 are respectively arranged on the inlet and outlet pipelines of the steam side of the molten salt microchannel heat exchanger 1 under test, and their function is to connect / isolate the molten salt microchannel heat exchanger 1 under test to the main system during the operation / stop of the test platform.

[0042] Various sensors are arranged on the steam side outlet pipe and inlet pipe of the tested molten salt microchannel heat exchanger 1. Figure 2 As shown, the steam inlet pipeline of the tested molten salt microchannel heat exchanger 1 is sequentially provided with a steam inlet pressure gauge 110, a steam filter 111, a steam flow meter 112 and a steam inlet thermometer 113, wherein the steam inlet pressure gauge 110 is provided upstream of the steam filter 111; the steam outlet pipeline is sequentially provided with a steam outlet thermometer 115 and a steam outlet pressure gauge 116. The measuring points of the steam differential pressure gauge 114 are respectively provided on the steam inlet pipeline and the steam outlet pipeline of the tested molten salt microchannel heat exchanger 1.

[0043] The heat transfer oil heat storage circuit is the second energy recovery device of the utility model: starting from the outlet of the heat transfer oil channel of the steam-water-oil heat exchanger 14, it is connected in sequence to the heat transfer oil supply device 21, the heat transfer oil regulating valve 22, the heat transfer oil flow meter 23, and then connected to the heat transfer oil channel inlet of the steam-water-oil heat exchanger 14. The function of the heat transfer oil heat storage circuit is to store the steam heat in the heat transfer oil, heat the softened water to the steam state when the test platform is turned on, and provide hot steam to preheat the heat exchanger and the steam pipeline.

[0044] Temperature measuring points are provided at the inlet and outlet of the molten salt side and the steam side of the molten salt preheater 4, and at the inlet and outlet of the steam side and the heat transfer oil of the steam-water-oil heat exchanger 14.

[0045] The outside of the molten salt pipeline and steam pipeline are both equipped with quartz wool insulation to reduce heat loss. To prevent molten salt freezing and blocking, electric heating is installed on the molten salt side pipeline, valves, pumps, flow meters, and the outside of the tested molten salt microchannel heat exchanger 1. At least 6 temperature measuring points (e.g., 2 on the top, bottom, and side) are set on the outer wall of the tested molten salt microchannel heat exchanger 1 to monitor the temperature of the outer wall of the heat exchanger in real time. When the temperature of the measuring point is lower than the melting point of the molten salt, the electric heating is automatically started. When the average temperature is higher than the melting point of the molten salt by 10°C, the electric heating is automatically turned off.

[0046] The control module in the test platform connects the sensors and controlled components in each circuit to realize parameter collection and state control. The collected parameters can be used to perform operations such as heat exchanger performance monitoring.

[0047] The working process of the molten salt microchannel heat exchanger performance test platform of this utility model is as follows:

[0048] Step 1: Before starting the test task, check the system status to ensure that all monitoring instruments, valves, etc. can operate normally.

[0049] Step 2: Preheat the test system: Run the electric heating system to heat the molten salt microchannel heat exchanger 1 under test and the valves, pumps, flow meters, molten salt side pipelines and other pipelines and equipment on the test platform; run the variable power resistance wire heater in the low-temperature molten salt tank 2 to heat the molten salt in the low-temperature molten salt tank 2 to a melting point above 10°C; the softened water supply device 18 passes the softened water into the steam-water electric heater 15 to heat it to high-temperature steam, and preheat the steam side pipeline.

[0050] Step 3: The molten salt stored in the low-temperature molten salt tank 2 is pumped into the main pipeline, enters the high-temperature molten salt tank 6 after passing through the molten salt preheater 4, and is stored in the high-temperature molten salt tank 6 in small quantities. The molten salt flow rate is automatically adjusted according to the liquid level height of the high-temperature molten salt tank 6.

[0051] Step 4: The variable power resistance wire heater built into the high temperature molten salt tank 6 heats the molten salt to the set temperature, and then pumps it into the molten salt side of the tested molten salt microchannel heat exchanger 1. The steam-water electric heater 15 heats the softened water into steam and passes it into the steam side of the tested molten salt microchannel heat exchanger 1.

[0052] Step 5: Open the steam inlet stop valve 11 of the molten salt preheater, operate the molten salt preheater 4, and realize heat transfer from high-temperature steam to low-temperature molten salt; operate the steam-water-oil heat exchanger 14, transfer part of the steam heat and store it in the thermal oil, control the thermal oil regulating valve 22 to adjust the flow rate, and control the steam outlet temperature of the steam-water-oil heat exchanger 14.

[0053] Step 6: Control the opening of the molten salt regulating valve 7 and the softened water regulating valve 19 according to the readings of the molten salt flow meter 104 and the steam flow meter 112 to maintain the inlet flow rates of the molten salt side and the steam side of the molten salt microchannel heat exchanger 1 under test unchanged.

[0054] Step 7: When the test platform runs stably, record the flow rate, temperature, pressure difference and other readings at the inlet and outlet of the molten salt side and the steam side of the tested molten salt microchannel heat exchanger 1, and conduct performance test.

[0055] Step 8: After the system has been running stably for a period of time, the built-in molten salt pumps, thermal oil supply device 21, and softened water supply device 18 of the high-temperature molten salt tank 6 and the low-temperature molten salt tank 2 are turned off in turn, and the steam drain valve 17 set on the thermal oil heat storage loop is opened to discharge the high-temperature steam in the pipeline; then, high-temperature nitrogen is introduced into the molten salt side of the molten salt microchannel heat exchanger 1 to blow out the residual molten salt in the channel to prevent the molten salt from condensing and blocking the channel. The drain operation is turned on after the thermal oil supply system is turned off, so that the high-temperature steam in the water vapor loop is discharged and no longer circulates into the heat exchanger to be tested.

[0056] Step 9: After the system stops for a period of time, operate the softened water supply device 18 and the heat transfer oil supply device 21, and pass the softened water and heat transfer oil into the steam-water-oil heat exchanger 14. The purpose is to use the heat stored in the heat transfer oil to heat the softened water to a steam state, and preheat the steam pipeline and the heat exchanger to be tested. When the steam temperature is low, operate the steam-water electric heater 15 to heat the steam.

[0057] The operation and shutdown of the above test platform can be carried out periodically until the test cycle requirements are met.

[0058] The above specific embodiments only describe the design principle of the utility model. The shapes and names of the components in the description can be different and are not limited. Therefore, technicians in the field of the utility model can modify or replace the technical solutions recorded in the above embodiments; and these modifications and replacements do not deviate from the creative purpose and technical solutions of the utility model and should all fall within the protection scope of the utility model.

Claims

1. A low-energy consumption molten salt microchannel heat exchanger performance test platform that supports long-term operation, characterized in that: The test platform includes a molten salt loop, a steam loop, a thermal oil heat storage loop, and a control module; The molten salt loop is led out from the molten salt side outlet of the molten salt microchannel heat exchanger (1) to be tested, connected in sequence to the low-temperature molten salt tank (2) and the high-temperature molten salt tank (7), and then connected to the molten salt side inlet of the molten salt microchannel heat exchanger (1) to be tested; The steam loop is led out from the steam side outlet of the molten salt microchannel heat exchanger (1) to be tested, and is connected in sequence to the steam pipeline of the molten salt preheater (4), the steam pipeline of the steam-water-oil heat exchanger (14), and the steam-water electric heater (15), and then connected to the steam side inlet of the molten salt microchannel heat exchanger (1) to be tested; the steam-water electric heater (15) is connected to a softened water supply device (18); wherein the molten salt preheater (4) is connected to the pipeline between the low-temperature molten salt tank (2) and the high-temperature molten salt tank (7) in the molten salt loop, and the recovered steam energy is used to heat the low-temperature molten salt; The heat transfer oil heat storage circuit is led out from the heat transfer oil side outlet of the steam-water-oil heat exchanger (14), connected to the heat transfer oil supply device (21) and returned to the heat transfer oil side inlet of the steam-water-oil heat exchanger (14), and the remaining steam energy in the steam-water-oil heat exchanger (14) is further recovered into the heat transfer oil; The control module is connected to sensors in each circuit.

2. The platform according to claim 1, characterized in that The volume of the high-temperature molten salt tank (7) is smaller than the volume of the low-temperature molten salt tank (2).

3. The platform according to claim 1, characterized in that A molten salt inlet pressure gauge (102), a molten salt filter (103), a molten salt flowmeter (104) and a molten salt inlet thermometer (105) are sequentially arranged on the molten salt side inlet pipeline of the molten salt microchannel heat exchanger (1) being tested, wherein the molten salt inlet pressure gauge (102) is arranged upstream of the molten salt filter (103); a molten salt outlet thermometer (107) and a molten salt outlet pressure gauge (108) are sequentially arranged on the molten salt side outlet pipeline of the molten salt microchannel heat exchanger (1) being tested; and measurement points of the molten salt differential pressure gauge (106) are respectively arranged on the molten salt side inlet pipeline and outlet pipeline of the molten salt microchannel heat exchanger (1) being tested.

4. The platform according to claim 1, characterized in that The steam inlet pipeline of the molten salt microchannel heat exchanger (1) under test is provided with a steam inlet pressure gauge (110), a steam filter (111), a steam flow meter (112) and a steam inlet thermometer (113) in sequence, wherein the steam inlet pressure gauge (110) is provided upstream of the steam filter (111); the steam outlet pipeline of the molten salt microchannel heat exchanger (1) under test is provided with a steam outlet thermometer (115) and a steam outlet pressure gauge (116) in sequence; and the measuring points of the steam differential pressure gauge (114) are respectively provided on the steam inlet pipeline and the outlet pipeline of the molten salt microchannel heat exchanger (1) under test.

5. The platform according to claim 1, characterized in that A molten salt preheater steam flow meter (12), a molten salt preheater steam inlet stop valve (11), and a test module steam outlet stop valve (10) are provided on the steam circuit between the molten salt preheater (4) and the steam side outlet of the molten salt microchannel heat exchanger (1) to be tested; and a test module steam inlet stop valve (16) is provided on the steam circuit between the molten salt preheater (4) and the steam side inlet of the molten salt microchannel heat exchanger (1) to be tested.

6. The platform according to claim 1, characterized in that A molten salt preheater steam regulating valve (13) is provided between the steam inlet pipeline and the steam outlet pipeline of the molten salt preheater (4) to regulate the molten salt temperature at the outlet of the molten salt preheater (4).

7. The platform according to claim 1, characterized in that The outlet pipeline of the steam-water-oil heat exchanger (14) is connected to a steam exhaust bypass and is provided with a steam exhaust valve (17).

8. The platform according to claim 1, characterized in that The steam-water electric heater (15) is arranged on the steam-side inlet pipeline of the molten salt microchannel heat exchanger (1) to be tested, and is used to replenish the steam in the loop when the test platform is running, and to control the softened water regulating valve (19) to maintain the stability of the steam flow rate at the steam-side inlet of the molten salt microchannel heat exchanger (1) to be tested.

9. The platform according to claim 1, characterized in that When the steam-water-oil heat exchanger (14) is restarted after the test platform is periodically shut down for rest, the heat stored in the heat transfer oil is used to heat the softened water to a steam state, thereby preheating the steam pipeline and the molten salt microchannel heat exchanger being tested.

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