Heat collection testing device for high-temperature molten salt

Abstract

The invention relates to a testing technology of high-temperature fused salt heat absorption equipment, and discloses a high-temperature fused salt heat collection testing device, which comprises a first storage tank and a second storage tank, and fused salt flow between the first storage tank and the second storage tank is driven by air pressure difference; two ends of the pipeline are respectively connected with the first storage tank and the second storage tank; the heat absorption pipe is arranged on the pipeline, and the high-temperature characteristic of the heat absorption pipe is tested under the condition that the fused salt flows at high temperature; the heating and heat preservation device is arranged outside the first storage tank, the second storage tank and the pipeline; one end of the driving air pipe is connected with the first storage tank, and the other end is connected with the second storage tank. According to the invention, the performance test of the heat-absorbing tube at the high temperature of 800 DEG C is realized; the test stability is improved by a simplified flow driving mode; the thermal stress problem of the pipeline is eliminated; the construction and use cost of the testing device is reduced; performance data are provided for key components of the high-temperature photo-thermal power generation system.

Description

Technical Field

[0001] This application relates to the technical field of solar thermal power generation, and particularly to the testing technology of high-temperature molten salt heat absorption tubes. Background Art

[0002] Solar thermal power generation technology is a method of efficiently generating electricity using solar energy. It mainly collects solar energy through heat absorption tubes and converts it into heat energy, and then converts it into electrical energy through a heat exchanger. Molten salt, as a commonly used heat storage medium, plays an important role in solar thermal power generation systems. Molten salt has a high specific heat capacity and thermal conductivity, can store a large amount of heat energy at high temperatures, and provides a stable heat source for the power generation system.

[0003] However, with the development of solar thermal power generation technology, higher requirements are put forward for the high-temperature performance of heat absorption tubes and molten salt storage tanks. Currently, the operating temperature of molten salt in most solar thermal power generation systems is limited to about 565°C. This temperature limit is determined by existing materials and technologies, especially the stability and durability of heat absorption tubes and molten salt storage tanks in high-temperature environments. In order to improve the efficiency and output of solar thermal power generation systems, the operating temperature needs to be increased to a higher level, such as 800°C.

[0004] However, in the process of increasing the operating temperature, there are many technical challenges. First, traditional testing devices cannot operate stably at such high temperatures, which limits the performance testing of materials and equipment. Second, thermal stress management in high-temperature environments becomes a key issue because under high-temperature conditions, the thermal expansion of materials and structural components may cause serious thermal stress problems. In addition, the flow and storage of molten salt at high temperatures are also a technical problem, and efficient and stable flow control and storage solutions are required.

[0005] In summary, the main problems in the existing technology include: heat absorption tubes and molten salt storage tanks cannot operate stably in high-temperature environments exceeding 565°C, and there is a lack of testing devices suitable for high-temperature environments and effective thermal stress management solutions. Therefore, developing a testing device that can operate stably at 800°C high temperature to evaluate and verify the performance of heat absorption tubes and molten salt storage tanks is of great significance for promoting the development of solar thermal power generation technology. Summary of the Invention

[0006] The purpose of this application is to provide a heat collection testing device for high-temperature molten salt to solve the problems raised in the above background art.

[0007] This application discloses a heat collection testing device for high-temperature molten salt, including:

[0008] A first storage tank for storing high-temperature molten salt;

[0009] A second storage tank for storing high-temperature molten salt, with a volume larger than that of the first storage tank. The flow of molten salt between the first storage tank and the second storage tank is driven by a pressure difference.

[0010] A pipeline with two ends respectively connected to the first storage tank and B to enable the flow of molten salt between the first storage tank and B.

[0011] An endothermic tube is provided on the pipeline to test its high-temperature endothermic characteristics under the condition of high-temperature flow of molten salt. The high-temperature characteristics are selected from the following group: the elongation of the endothermic tube, the adhesion characteristics of the internal material.

[0012] A heating and heat preservation device is provided outside the first storage tank, B and the pipeline to heat the molten salt to a predetermined test temperature.

[0013] A driving air pipe has one end connected to the first storage tank and the other end connected to the second storage tank to drive the flow of molten salt in the pipeline. Among them, the first storage tank is connected to the driving air pipe to drive the flow of molten salt by adjusting the pressure difference.

[0014] In a preferred example, the second storage tank is located above the first storage tank, and gravity is utilized to promote the flow of molten salt from the second storage tank to the first storage tank.

[0015] In a preferred example, the storage tank, the pipeline, and the driving air pipe all include the heating and heat preservation device.

[0016] In a preferred example, the first storage tank is a small high-temperature alloy storage tank, and the second storage tank is a large stainless steel composite plate structure storage tank.

[0017] In a preferred example, the device further includes: a steel platform for supporting the device.

[0018] In a preferred example, the device further includes: a pipeline support device for providing flexible support to the pipeline.

[0019] In a preferred example, the pipeline support device adopts a flexible support method to release the thermal displacement generated due to high temperature.

[0020] In a preferred example, the device further includes: an instrument control system for controlling the temperature of the storage tank heater and real-time monitoring and displaying parameters. The parameters are selected from the following group: molten salt temperature, flow rate, pressure.

[0021] In a preferred example, the molten salt in the second storage tank can flow to the first storage tank by gravity, or its flow can be accelerated by air pressure; the first storage tank can only drive the flow of molten salt inside by a pressure difference.

[0022] In the embodiments of the present application, two storage tanks with different designs work together to provide a high-temperature molten salt flow, and the gravity and air pressure difference are utilized to drive the molten salt flow to achieve the high-temperature test of the heat absorption tube.

[0023] The present application has the following technical effects:

[0024] Improve power generation efficiency: The device can be tested at a high temperature of 800 °C. Compared with the traditional molten salt temperature of 565 °C, the efficiency of the solar thermal power generation system can be significantly improved. This increase in temperature helps to expand the high-temperature applicable range of the heat absorption tube, which may increase the operating temperature of the molten salt system, further improve the power generation efficiency and reduce the power generation cost.

[0025] Simplify the design and reduce costs: By simplifying the driving and stirring equipment, removing the built-in heater and vibration source, the design of the device is more simple and practical, and the operation is more stable. The design of the second storage tank adopts a large-capacity stainless steel composite plate structure, while the first storage tank is designed as a small high-temperature alloy storage tank, considering cost factors, so as to effectively reduce the overall construction cost.

[0026] Thermal stress solution: The pipeline adopts flexible supports, which can effectively eliminate the pipeline thermal stress problems that may occur under the high temperature condition of 800 °C, ensure the service life of the pipeline, and have the advantage of thermal displacement release.

[0027] High-temperature molten salt medium storage and flow: By using the high pressure of the first storage tank and the low pressure of the second storage tank in combination, the air pressure difference is used to drive the molten salt flow, which simplifies the driving mode of the flow and improves the operation stability of the test process. The molten salt then naturally flows from the second storage tank to the first storage tank by gravity, greatly reducing the design requirements and construction cost of the second storage tank. This flow control method not only ensures the fluidity of the molten salt, but also provides verification for the storage of the high-temperature molten salt medium in the second storage tank.

[0028] Performance test at high temperature: The device provides a test platform to test the performance of the heat absorption tube under the high temperature condition of 800 °C, including the elongation amount, the material adhesion characteristics on the heat absorption tube, etc. This helps to evaluate and verify the performance and tolerance of key components used in the solar thermal power generation system, such as the heat absorption tube and the storage tank, at extremely high temperatures.

[0029] In summary, through its innovative design and functions, this high-temperature test device provides an efficient and economical way for the solar thermal power generation system to test the performance of key components under extreme high temperature conditions, which helps to improve the overall efficiency of the system and reduce costs. At the same time, it also provides an effective solution for the storage and flow of the molten salt medium in a high-temperature environment.

[0030] The description of this application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features (i.e., technical solutions) of this application were to be listed, the description would become overly lengthy. To avoid this problem, each technical feature disclosed in the above-mentioned invention content of this application, each technical feature disclosed in the following embodiments and examples, and each technical feature disclosed in the drawings can be freely combined with each other to form various new technical solutions (all of these technical solutions are considered to have been recorded in this description), unless the combination of such technical features is technically infeasible. For example, in one example, features A + B + C are disclosed, and in another example, features A + B + D + E are disclosed. Features C and D are equivalent technical means that perform the same function, and only one of them can be used technically and it is impossible to use both simultaneously. Feature E can be combined with feature C technically. Then, the solution A + B + C + D should not be considered to have been recorded because it is technically infeasible, while the solution A + B + C + E should be considered to have been recorded. Description of the Drawings

[0031] Figure 1 is a schematic diagram of the principle of a heat absorption test device for high-temperature molten salt according to the first embodiment of this application;

[0032] Figure 2 is a schematic diagram of the first storage tank, the second storage tank, the pipeline, and the heat absorption pipe of the heat absorption test device for high-temperature molten salt according to the first embodiment of this application;

[0033] Figure 3 is a schematic diagram of the overall structure and the pipeline support device of the heat absorption test device for high-temperature molten salt according to the first embodiment of this application.

[0034] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0035] 10: First storage tank

[0036] 20: Second storage tank

[0037] 21: Air inlet

[0038] 22: Replacement gas inlet

[0039] 23: Safety valve port

[0040] 24: Exhaust port

[0041] 30: Pipeline

[0042] 40: Heat absorption pipe

[0043] 50: Driving gas pipe

[0044] 60: Gas storage tank

[0045] 70: Tail gas treatment device Specific implementation manners

[0046] In the following description, many technical details are provided to help readers better understand the present application. However, those of ordinary skill in the art can understand that the claimed technical solutions of the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0047] Explanation of some concepts:

[0048] Molten salt: Refers to molten inorganic salts such as sodium potassium nitrate, etc., which can be used as heat transfer and storage media, and have characteristics such as good thermal stability and high thermal conductivity.

[0049] Heat absorption tube: A tube device that absorbs light and transfers heat under the condition of molten salt flow. A specially designed absorption coating is used.

[0050] Storage tank: A large container used to store and contain molten salt, generally made of corrosion-resistant and high-temperature-resistant materials.

[0051] Pipeline: A pipe connecting two storage tanks, used for the flow of molten salt between the storage tanks. Flexible pipelines are used to adapt to thermal stress.

[0052] Drive gas pipeline: The inlet and outlet pipelines set to achieve the flow of molten salt, which pushes the molten salt to flow in the pipeline by controlling the pressure difference.

[0053] Instrument control system: A system device used to monitor and display parameters such as temperature and pressure during the test process.

[0054] The following briefly describes some innovative points of the present application:

[0055] After research and analysis, the inventors of this application creatively proposed a heat collection test device for high-temperature molten salt to test the high-temperature performance of the heat absorption tube under the condition of 800°C in response to the problems pointed out in the above text. The device provides a high-temperature molten salt flow through the coordinated operation of two storage tanks with different designs, and uses the air pressure difference to drive the molten salt flow to achieve the high-temperature test of the heat absorption tube. Specifically, a small alloy first storage tank and a large stainless steel second storage tank are used; the first storage tank provides high air pressure to press the molten salt into the second storage tank, and at the same time the molten salt flows back to the first storage tank through the second storage tank by gravity, so as to maintain the molten salt flow in the pipeline and greatly reduce the design and construction costs of the storage tank; the pipeline adopts flexible support to eliminate thermal stress; the heating system heats the entire test device. Through this technical solution, the performance test of the heat absorption tube under the condition of 800°C is realized; the simplified flow driving method improves the test stability; the thermal stress problem of the pipeline is eliminated; the construction and use costs of the test device are reduced; performance data is provided for the key components of the high-temperature solar thermal power generation system. This application provides a complete set of high-temperature molten salt test solutions through reasonable equipment design and flow control methods, and realizes the purpose of reliable performance test of the heat absorption tube under the condition of 800°C. This technology can support the research and development of high-temperature solar thermal power generation systems.

[0056] To make the purpose, technical solution and advantages of this application clearer, the following will further describe the implementation manners of this application in detail with reference to the accompanying drawings.

[0057] The first embodiment of this application relates to a test device for a high-temperature molten salt heat absorption tube 40, and its structure can be seen in Figure 1 、 Figure 2 and Figure 3 .

[0058] The test device for the high-temperature molten salt heat absorption tube 40 in this embodiment includes:

[0059] A first storage tank 10 for storing high-temperature molten salt.

[0060] Optionally, an air inlet and an air outlet are provided at the top of the first storage tank 10. More specifically, the first storage tank 10 is used to store high-temperature molten salt, and the first storage tank 10 is a pressure-bearing storage tank that can withstand high-temperature and high-pressure conditions. Further, the first storage tank 10 includes: a steel shell, which is cylindrical and used to accommodate high-temperature molten salt; a top cover, which is installed at the top of the steel shell; an air inlet, which is provided on the top cover and used to introduce gas into the first storage tank 10; an air outlet, which is provided on the top cover and opposite to the air inlet and used for gas discharge; air inlet and outlet valves, which are respectively provided on the air inlet and the air outlet and used to adjust their respective opening and closing; a filling port, which is provided on the top cover and used to fill molten salt into the first storage tank 10; a safety valve, which is provided on the top cover and discharges excess gas when the internal pressure is too high. The top cover of the first storage tank 10 is designed with a curved surface shape to enhance its pressure-bearing capacity. The air inlet, the air outlet, the filling port, and the safety valve are all provided on the top cover for convenient operation. The inside of the first storage tank 10 can withstand high pressure, ensuring the controllability of the air pressure during the test process.

[0061] The second storage tank 20 is used to store high-temperature molten salt, and its volume is larger than that of the first storage tank 10. The flow of molten salt between the first storage tank 10 and the second storage tank 20 is driven by the air pressure difference. Optionally, the second storage tank 20 is located above the first storage tank 10. Such an arrangement utilizes gravity to promote the flow of molten salt from the second storage tank 20 to the first storage tank 10, reducing the need for additional driving force.

[0062] Optionally, an air inlet 21, a replacement gas inlet 22, a safety valve 23, and an exhaust port 24 are provided at the top of the second storage tank 20. More specifically, the second storage tank 20 is used to store high-temperature molten salt, and its volume is larger than that of the first storage tank 10. The flow of molten salt between the first storage tank 10 and the second storage tank 20 is driven by a pressure difference, and the flow from the second storage tank 20 to the first storage tank 10 is driven by gravity. Further, the second storage tank 20 includes: a storage tank shell, which is a large-volume cylindrical stainless steel storage tank for storing a large amount of high-temperature molten salt; a top cover installed at the top of the storage tank shell; an air inlet 21 provided above the top cover for the entry of gas; an exhaust port 24 provided above the top cover, opposite to the air inlet 21, for the discharge of gas; a replacement gas inlet 22 provided above the top cover for replacing the gas in the tank before filling the molten salt; safety valves respectively provided at the air inlet and the exhaust port for regulating the gas flow rate. Further, the second storage tank 2 may further include: a filling port provided above the top cover for filling molten salt into the second storage tank 20; a liquid level gauge installed on the side wall of the second storage tank 20 for detecting the liquid level of the molten salt in the storage tank; a support for supporting the second storage tank 20. The second storage tank 20 does not need to withstand internal pressure, and the large-volume design can reduce costs. The interfaces on the top cover facilitate the connection operation of various pipelines. The second storage tank 20 provides the liquid level pressure difference required to drive the flow of molten salt.

[0063] A pipeline 30, the two ends of which are respectively connected to the first storage tank 10 and B to enable the flow of molten salt between the first storage tank 10 and B.

[0064] Optionally, the pipeline 30 includes: a pipe body, which is a pipeline 30 made of a high-temperature alloy material and is used for the flow of molten salt inside; a first pipe end connected to the top of the first storage tank 10; a second pipe end connected to the bottom of the second storage tank 20; an absorber tube 40 between the first pipe end and the second pipe end, and all pipelines 30 are connected by welding; a support device for supporting the pipeline 30, and the support device adopts a spring support or a sliding support to reduce the influence of thermal stress and vibration.

[0065] An absorber tube 40 is provided on the pipeline 30 to test its high-temperature heat absorption characteristics under the condition of high-temperature flow of molten salt, and the high-temperature characteristics are selected from the following group: the elongation of the absorber tube 40, the adhesion characteristics of the internal material.

[0066] Optionally, the heat absorption tube 40 is arranged on the pipeline, and its heat absorption and high-temperature performance effects are tested under the condition of high-temperature molten salt medium, such as the elongation of the heat absorption tube 40, the adhesion characteristics of the internal material, etc. The heat absorption tube 40 is a straight tube with a coating on the outside and is welded to the pipeline 30. The heat absorption tube 40 is of a two-section tube type, with the pipeline 30 in the middle and arranged with supports. It is used to test the performance effect of the heat absorption tube 40 under the condition of such high-temperature molten salt medium when the molten salt is in a high-temperature state in the pipeline. Through testing, the high-temperature performance parameters of the heat absorption tube 40 under the simulated actual working environment can be evaluated.

[0067] The heating and heat preservation device is arranged outside the first storage tank 10, B and the pipeline 30, and is used to heat the molten salt to a predetermined test temperature;

[0068] Optionally, the storage tank, the pipeline 30, and the driving gas pipe 50 all include the heating and heat preservation device.

[0069] Optionally, a specific implementation manner of the heating and heat preservation device includes: a heating tape, which is an externally applied electric heating wire and is tightly wound on the outer surfaces of the first storage tank 10, the second storage tank 20, and the pipeline 30; a temperature probe, which is externally attached to the storage tank and the pipeline 30 and is connected to a temperature controller; the temperature controller is connected to the heating tape and the temperature probe to monitor the heating temperature in real time and control the power of the heating tape; a heat preservation layer, which is made of high-temperature heat-insulating material and covers the outer surface of the heating tape; a fastening tape, which fastens the heat preservation layer on the outer surfaces of the storage tank and the pipeline 30. In this way, the molten salt is heated by externally applying an electric heating tape, and then covered with heat-insulating material to reduce heat loss, so as to accurately and efficiently realize the heating and temperature control of the test device.

[0070] The driving gas pipe 50 has one end connected to the first storage tank 10 and the other end connected to the second storage tank 20, and is used to drive the molten salt to flow in the pipeline 30. Among them, the first storage tank 10 is connected to the driving gas pipe 50 to drive the molten salt to flow by adjusting the air pressure difference.

[0071] Optionally, the driving gas pipe 50 includes: a gas pipe body, the pipe body of which is made of a high-temperature alloy material; a first interface, which is arranged at one end of the gas pipe body and is connected to the top air inlet of the first storage tank 10; a second interface, which is arranged at the other end of the gas pipe body and is connected to the top exhaust port of the second storage tank 20; a regulating valve, which is arranged on the gas pipe body and is used to adjust the air pressure difference; a pressure gauge, which is used to monitor the air pressure parameters. The driving gas pipe 50 inputs compressed gas into the first storage tank 10 through the first interface and is connected to the top of the second storage tank 20 through the second interface, and forms a driving force for the molten salt to flow by means of the air pressure difference between the two storage tanks. The regulating valve can control the air pressure difference, and the pressure gauge monitors the air pressure in real time to ensure the stability of the test parameters.

[0072] Optionally, the first storage tank 10 is a small high-temperature alloy storage tank, and the second storage tank 20 is a large stainless steel composite plate structure storage tank.

[0073] Optionally, the volume of the first storage tank 10 is designed to be small. For the convenience of pressurization and cost considerations, high-temperature alloy materials such as nickel-chromium alloy and titanium alloy are selected to make it, ensuring its mechanical seal performance. The structure of the first storage tank 10 consists of a cylinder body and two end heads. The heads are designed as ellipsoids without internal protrusions to enhance its pressure-bearing capacity. The first storage tank 10 has the characteristics of a thick-walled cylinder body and a small diameter. The second storage tank 20 is used to store a large amount of molten salt and adopts a large-volume design. Its material is assembled by multiple composite plates. The first layer is stainless steel, and the inside is a surfacing layer to prevent molten salt corrosion; the outside is wrapped with heat-resistant material as the heat insulation layer. The structure of the second storage tank 20 is a large-diameter cylinder body and a flat head cover. The connection method with the pipeline 30 is welding, and the molten salt injection port at the top is flange sealed. The second storage tank 20 has the characteristics of a thin-walled cylinder body and a large diameter and does not need to bear internal pressure. Such a design reduces costs and conforms to the functional positioning of the two storage tanks. Optionally, the ratio range of the volume of the first storage tank 10 to the volume of the second storage tank 20 is 1:5 - 1:40. Preferably, the ratio range is 1:5 - 1:20.

[0074] Optionally, the device further includes: a steel platform for supporting the device.

[0075] Optionally, the device further includes: a pipeline 30 support device for providing flexible support to the pipeline 30.

[0076] Optionally, the pipeline 30 support device adopts a flexible support method for releasing the thermal displacement caused by high temperature. Optionally, the pipeline 30 adopts flexible support technology. The flexible support technology refers to using a bendable pipe as a self-compensation material with the ability of bending deformation. At the same time, as Figure 3 shown, elastic supports and hangers (for example, fixing the pipeline 30 by hanging, etc.) are adopted to adapt to the thermal displacement caused by thermal expansion. Further, the flexible pipeline 30 is made of materials with high-temperature tolerance and elasticity, which can adapt to thermal expansion and contraction in a high-temperature environment and reduce the influence of thermal stress. The design of this flexible pipeline 30 enables the pipeline 30 to maintain structural integrity when bearing temperature changes, avoiding breakage or leakage caused by thermal stress, thereby ensuring the safety and continuity during the test process. In addition, the design of the flexible pipeline 30 can also simplify the installation and maintenance work and improve the reliability and durability of the entire test system.

[0077] Optionally, the device further includes: an instrument control system for controlling the temperature of the storage tank heater and real-time monitoring and displaying parameters selected from the following group: molten salt temperature, flow rate, and pressure.

[0078] Optionally, the molten salt in the second storage tank 20 can flow into the first storage tank 10 by gravity, or its flow can be accelerated by air pressure; the first storage tank 10 can only drive the flow of the molten salt inside by the air pressure difference.

[0079] It should be noted that Figure 1 The gas storage tank 60 in it is used to provide a gas source for the driving gas pipe and provide compressed gas to realize the flow of molten salt between the storage tanks. After the compressed gas is adjusted to an appropriate pressure by the pressure regulating valve, it enters the driving gas pipe to push the molten salt to flow. The tail gas treatment device 70 is used to treat the waste gas after the test, filter and purify the waste gas containing corrosive components, and ensure that the tail gas emission of the device meets the environmental protection requirements.

[0080] The working principle of the above embodiments is as follows:

[0081] Heating and flow of molten salt:

[0082] The second storage tank 20 in the device is initially filled with solid molten salt. The molten salt in the second storage tank 20 is heated to the liquid state by the heater.

[0083] At the same time, the gas in the first storage tank 10 remains at normal pressure. The first storage tank 10, the second storage tank 20 and the pipeline 30 connecting the two are heated to 800 °C to ensure the flow of molten salt in the whole system.

[0084] When the molten salt in the second storage tank 20 is heated to the flowing state, keep the first storage tank 10 at normal pressure and let the molten salt flow into the first storage tank 10 by gravity. When the first storage tank 10 is full, by increasing the air pressure in the first storage tank 10, use the air pressure difference to drive the liquid molten salt to flow from the first storage tank 10 to the second storage tank 20.

[0085] Test of the heat absorption tube 40:

[0086] When the flowing molten salt passes through the heat absorption tube 40, the performance of the heat absorption tube 40 is tested at high temperature. This includes testing its heat resistance, heat exchange efficiency, etc. under the high temperature condition of 800 °C.

[0087] By monitoring the flow characteristics and temperature changes of the molten salt in the heat absorption tube 40, the high temperature performance of the heat absorption tube 40 can be evaluated.

[0088] Thermal stress management:

[0089] Since the whole system needs to operate at high temperature, the pipeline 30 adopts flexible supports to avoid problems of thermal expansion and thermal stress caused by high temperature.

[0090] This design ensures that the pipeline 30 maintains its structural integrity and functionality under continuous high temperature operating conditions.

[0091] Control and monitoring system:

[0092] The instrument control system is used to control the operation of the heater to ensure that the molten salt is evenly heated throughout the system.

[0093] Meanwhile, the system also monitors the temperature and flow rate of the molten salt, as well as the air pressure in the first storage tank 10 and the second storage tank 20, to ensure stability and accuracy during the test process.

[0094] Recycling of molten salt:

[0095] After the test is completed, by controlling the air pressure in the first storage tank 10 and the second storage tank 20, the molten salt can circulate between the two storage tanks to facilitate continuous multiple tests.

[0096] In summary, this high-temperature molten salt endothermic test device realizes effective testing of the heat absorption tube 40 and other related components in an extremely high-temperature environment through its unique thermal management, flow control, and thermal stress mitigation designs. This not only improves the efficiency and accuracy of the test, but also provides a reliable method for evaluating and verifying the performance of key components of the solar thermal power generation system under actual working conditions.

[0097] The above embodiments have the following technical effects:

[0098] Improving power generation efficiency: The device can conduct tests at a high temperature of 800°C. Compared with the traditional molten salt temperature of 565°C, it can significantly improve the efficiency of the solar thermal power generation system. This increase in temperature helps to expand the high-temperature applicable range of the heat absorption tube 40, which may further increase the working temperature of the molten salt system, further improving power generation efficiency and reducing power generation costs.

[0099] Simplifying design and reducing costs: By simplifying the drive and stirring equipment, removing the built-in heater and vibration source, the design of the device is more simple and practical, and the operation is more stable. The second storage tank 20 is designed with a large-capacity stainless steel composite plate structure, while the first storage tank 10 is designed as a small high-temperature alloy storage tank, considering cost factors, thus effectively reducing the overall construction cost.

[0100] Thermal stress solution: The pipeline 30 adopts flexible supports, which can effectively eliminate the thermal stress problem of the pipeline 30 that may occur under the high temperature condition of 800°C, ensuring the service life of the pipeline 30 and having the advantage of thermal displacement release.

[0101] Storage and flow of high-temperature molten salt medium: By using the high pressure of the first storage tank 10 and the low pressure of the second storage tank 20 in combination, the molten salt is driven to flow by the air pressure difference, simplifying the flow driving method and improving the operation stability during the test process. The molten salt then naturally flows from the second storage tank 20 to the first storage tank 10 by gravity, greatly reducing the design requirements and construction costs of the second storage tank 20. This flow control method not only ensures the fluidity of the molten salt, but also provides verification for the storage of the high-temperature molten salt medium in the second storage tank 20.

[0102] Performance test at high temperature: The device provides a test platform to test the performance of the heat absorption tube 40 under the high temperature condition of 800 °C, including the elongation amount, the adhesion characteristics of the internal material, etc. This helps to evaluate and verify the performance and tolerance of key components used in the solar thermal power generation system, such as the heat absorption tube 40 and the storage tank, at extremely high temperatures.

[0103] Thus, through its innovative design and functions, the above embodiment provides an efficient and economical way for the solar thermal power generation system to test the performance of key components under extreme high temperature conditions, which helps to improve the overall efficiency of the system and reduce costs. At the same time, it also provides an effective solution for the storage and flow of molten salt medium in a high temperature environment.

[0104] It should be noted that in the application documents of this patent, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the existence of another identical element in the process, method, article or device comprising the said element. In the application documents of this patent, if it is mentioned that an act is performed according to a certain element, it means at least performing the act according to the said element, including two cases: only performing the act according to the said element, and performing the act according to the said element and other elements. Expressions such as multiple, many times, various, etc. include 2, 2 times, 2 kinds, and more than 2, more than 2 times, more than 2 kinds.

[0105] All the documents mentioned in this application are considered to be integrally included in the disclosure content of this application so as to be used as a basis for modification if necessary. In addition, it should be understood that after reading the above disclosure content of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope claimed by this application.

Claims

1. A heat collection test device for high-temperature molten salt, characterized in that, it includes: A first storage tank for storing high-temperature molten salt; A second storage tank for storing high-temperature molten salt, with a volume larger than that of the first storage tank, and the flow of molten salt between the first storage tank and the second storage tank is driven by a pressure difference; A pipeline, with both ends respectively connected to the first storage tank and B to enable the flow of molten salt between the first storage tank and B; A heat absorption pipe is arranged on the pipeline to test its high-temperature heat absorption characteristics under the condition of high-temperature flow of molten salt, and the high-temperature characteristics are selected from the following group: the elongation of the heat absorption pipe, the adhesion characteristics of the internal material; A heating and heat preservation device is arranged outside the first storage tank, B and the pipeline for heating the molten salt to a predetermined test temperature; A driving air pipe, with one end connected to the first storage tank and the other end connected to the second storage tank, for driving the molten salt to flow in the pipeline, wherein the first storage tank is connected to the driving air pipe to drive the flow of molten salt by adjusting the pressure difference.

2. The test device according to claim 1, characterized in that, The second storage tank is located above the first storage tank, and gravity is utilized to promote the flow of molten salt from the second storage tank to the first storage tank.

3. The test device according to claim 1, characterized in that, The storage tank, pipeline and driving air pipe all include the heating and heat preservation device.

4. The test device according to claim 1, characterized in that, The first storage tank is a small high-temperature alloy storage tank, and the second storage tank is a large stainless steel composite plate structure storage tank.

5. The test device according to claim 1, characterized in that, The device further includes: a steel platform for supporting the device.

6. The test device according to claim 1, characterized in that, The device further includes: a pipeline support device for providing flexible support to the pipeline.

7. The test device according to claim 1, characterized in that, The pipeline support device adopts a flexible support method for releasing the thermal displacement generated due to high temperature.

8. The test device according to claim 1, characterized in that, The device further includes: an instrument control system for controlling the temperature of the storage tank heater and real-time monitoring and displaying parameters, and the parameters are selected from the following group: molten salt temperature, flow rate, pressure.

9. The test device according to claim 1, characterized in that, The molten salt in the second storage tank can flow to the first storage tank by gravity, or its flow can be accelerated by air pressure; the molten salt inside the first storage tank can only be driven to flow by a pressure difference.

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