Heat collection testing device for high-temperature molten salt

Abstract

The utility model 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] The present application relates to the field of solar thermal power generation technology, and in particular to the testing technology of high-temperature molten salt heat absorption tubes. Background Art

[0002] Solar thermal power generation technology is a method of using solar energy to generate electricity efficiently. It mainly collects solar energy through heat absorption tubes and converts it into heat energy, and then converts it into electrical energy through heat exchangers. 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, and can store a large amount of heat energy at high temperatures, providing a stable heat source for the power generation system.

[0003] However, with the development of CSP technology, higher requirements are placed on the high-temperature performance of the absorber tube and molten salt storage tank. At present, the operating temperature of molten salt in most CSP systems is limited to around 565°C. This temperature limit is determined by existing materials and technologies, especially the stability and durability of the absorber tube and molten salt storage tank in high temperature environments. In order to improve the efficiency and output of CSP systems, the operating temperature needs to be raised to a higher level, such as 800°C.

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

[0005] In summary, the main problems existing in the prior art include: the heat absorption tube and molten salt storage tank cannot work stably in a high temperature environment exceeding 565°C, and there is a lack of test equipment suitable for high temperature environments and effective thermal stress management solutions. Therefore, developing a test device that can operate stably under high temperature conditions of 800°C to evaluate and verify the performance of the heat absorption tube and molten salt storage tank is of great significance to promote the development of solar thermal power generation technology. Utility Model Content

[0006] The purpose of the present application is to provide a high-temperature molten salt heat collection test device to solve the problems raised in the above-mentioned background technology.

[0007] The present application discloses a high-temperature molten salt heat collection test device, comprising:

[0008] The first storage tank is used to store high-temperature molten salt;

[0009] A second storage tank is used to store high-temperature molten salt, and its volume is 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;

[0010] A pipeline, both ends of which are connected to the first storage tank and B respectively, so as to realize the flow of molten salt between the first storage tank and B;

[0011] A heat absorbing tube is arranged on the pipeline, and its high temperature characteristics of heat absorption are tested under the condition of high temperature flow of molten salt, wherein the high temperature characteristics are selected from the following group: elongation of the heat absorbing tube, adhesion characteristics of internal materials;

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

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

[0014] In a preferred example, the second storage tank is located above the first storage tank, and gravity is used 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, pipeline, and 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 comprises: a steel platform for supporting the device.

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

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

[0020] In a preferred example, the device further comprises: an instrument control system for controlling the temperature of the tank heater and monitoring and displaying parameters in real time, wherein the parameters are selected from the following group: molten salt temperature, flow rate, and 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 the internal molten salt by air pressure difference.

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

[0023] This application has the following technical effects:

[0024] Improved power generation efficiency: The device can be tested at a high temperature of 800°C, which can significantly improve the efficiency of the solar thermal power generation system compared to the traditional molten salt temperature of 565°C. This temperature increase helps to expand the high temperature application range of the heat absorber, which may increase the operating temperature of the molten salt system, further improve power generation efficiency and reduce power generation costs.

[0025] Simplified design and cost reduction: By simplifying the driving and stirring equipment and removing the built-in heater and vibration source, the design of the device is simpler and more practical, and the operation is more stable. The second tank is designed with a large-capacity stainless steel composite plate structure, while the first tank is designed as a small high-temperature alloy tank, taking cost factors into consideration, thereby effectively reducing the overall construction cost.

[0026] Thermal stress solution: The pipeline adopts flexible support, which can effectively eliminate the thermal stress problem of the pipeline that may be caused under high temperature conditions of 800℃, 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, the pressure difference is used to drive the molten salt flow, which simplifies the flow driving method and improves the operation stability of the test process. The molten salt flows naturally from the second storage tank to the first storage tank by gravity, which greatly reduces the design requirements and construction costs of the large second storage tank. This flow control method not only ensures the fluidity of the molten salt, but also provides verification for the high-temperature molten salt medium storage in the second storage tank.

[0028] Performance testing at high temperatures: The device provides a test platform to test the performance of the absorber tube at 800°C, including elongation, material adhesion characteristics on the absorber tube, etc. This helps to evaluate and verify the performance and tolerance of key components used in CSP systems, such as absorber tubes and storage tanks, at extremely high temperatures.

[0029] In summary, this high-temperature test device, through its innovative design and functions, provides an efficient and economical way to test the performance of key components under extreme high temperature conditions for CSP systems, helping 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 media in high-temperature environments.

[0030] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned utility model content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the principle of a high-temperature molten salt endothermic testing device according to the first embodiment of the present application;

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

[0033] Figure 3 It is a schematic diagram of the overall structure and pipeline support device of the high-temperature molten salt endothermic testing device according to the first embodiment of the present application.

[0034] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[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 tube

[0043] 50: Driving air pipe

[0044] 60: Gas tank

[0045] 70: Exhaust treatment device DETAILED DESCRIPTION

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

[0047] Description of some concepts:

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

[0049] Heat absorber tube: refers to a tube device that absorbs and transfers heat from sunlight under molten salt flow conditions. It uses a specially designed absorption coating.

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

[0051] Pipeline: The pipe connecting two tanks is used for the circulation of molten salt between the tanks. Flexible pipes are used to adapt to thermal stress.

[0052] Driving air pipe: The air inlet and outlet pipes set up to realize the flow of molten salt, which drives the molten salt to flow in the pipeline by controlling the air pressure difference.

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

[0054] The following is a brief description of some of the innovative features of this application:

[0055] After research and analysis, the inventor of this application creatively proposed a high-temperature molten salt heat collection test device for testing the high-temperature performance of the heat absorption tube under 800°C conditions in response to the problems pointed out above. The device provides a high-temperature molten salt flow through two storage tanks of different designs working together, and uses the pressure difference to drive the molten salt flow to achieve high-temperature testing 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 pressure to press the molten salt into the second storage tank, and the molten salt flows back to the first storage tank through the second storage tank by gravity, thereby maintaining the flow of molten salt in the pipeline, greatly reducing 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 high temperature conditions of 800°C is realized; the simplified flow drive method improves the test stability; eliminates the thermal stress problem of the pipeline; reduces the construction and use costs of the test device; and provides performance data for key components of the high-temperature solar thermal power generation system. This application provides a complete set of high-temperature molten salt testing solutions through reasonable equipment design and flow control methods, achieving the purpose of reliable performance testing of heat absorption tubes at 800°C. This technology can support the research and development of high-temperature solar thermal power generation systems.

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0057] The first embodiment of the present application relates to a high-temperature molten salt heat absorbing tube 40 testing device, the structure of which can be seen in Figure 1 , Figure 2 and Figure 3 .

[0058] The high-temperature molten salt heat absorbing tube 40 testing device in this embodiment includes:

[0059] The first storage tank 10 is used to store high-temperature molten salt.

[0060] Optionally, the top of the first storage tank 10 is provided with an air inlet and an exhaust port. 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, the steel shell is cylindrical, and is used to accommodate high-temperature molten salt; a top cover, which is installed on the top of the steel shell; an air inlet, which is arranged on the top cover, is used to introduce gas into the first storage tank 10; an exhaust port, which is arranged on the top cover, opposite to the air inlet, is used for gas discharge; an inlet and outlet valve, which are respectively arranged on the air inlet and the exhaust port, are used to adjust their respective opening and closing; a filling port, which is arranged on the top cover, is used to fill molten salt into the first storage tank 10; a safety valve, which is arranged on the top cover, 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, exhaust port, filling port, and safety valve are all arranged on the top cover for easy operation. The interior of the first storage tank 10 can withstand high pressure, ensuring the controllability of the air pressure in the first storage tank 10 during the test.

[0061] The second storage tank 20 is used to store high-temperature molten salt, and its volume is larger than 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 pressure difference. Optionally, the second storage tank 20 is located above the first storage tank 10. Such an arrangement uses 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, the top of the second storage tank 20 is provided with an air inlet 21, a replacement gas inlet 22, a safety valve 23, and an exhaust port 24. More specifically, the second storage tank 20 is used to store high-temperature molten salt, and its volume is larger than the first storage tank 10. The molten salt flow between the first storage tank 10 and the second storage tank 20 is driven by air pressure difference, and the flow between the second storage tank 20 and the first storage tank 10 is driven by gravity. Further, the second storage tank 20 includes: a storage tank shell, which adopts a large-volume cylindrical stainless steel storage tank for storing a large amount of high-temperature molten salt; a top cover, which is installed on the top of the storage tank shell; an air inlet 21, which is arranged above the top cover for gas entry; an exhaust port 24, which is arranged above the top cover, opposite to the air inlet 21, for gas discharge; a replacement gas inlet 22, which is arranged above the top cover, plays a role in gas replacement in the tank before the molten salt is loaded; and a safety valve is respectively arranged on the air inlet and the exhaust port to adjust the gas flow. Furthermore, the second storage tank 2 may also include: a filling port, arranged 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 molten salt in the storage tank; a bracket, 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 interface on the top cover facilitates the connection operation of various pipelines. The second storage tank 20 provides the liquid level pressure difference required to drive the molten salt flow.

[0063] The two ends of the pipeline 30 are connected to the first storage tanks 10 and B respectively to realize the flow of molten salt between the first storage tanks 10 and B.

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

[0065] The heat absorbing tube 40 is arranged on the pipeline 30, and its high-temperature heat absorption characteristics are tested under the condition of high-temperature flow of molten salt. The high-temperature characteristics are selected from the following group: the elongation of the heat absorbing tube 40 and 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 effect is tested under the molten salt high temperature medium condition, 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, which is welded to the pipeline 30. The heat absorption tube 40 is a two-section tube type, with the pipeline 30 in the middle and a support arranged. It is used to test the performance effect of the heat absorption tube 40 under such high temperature molten salt medium conditions when the molten salt is in the pipeline at a high temperature. Through the test, the high temperature performance parameters of the heat absorption tube 40 under the simulated actual working environment can be evaluated.

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

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

[0069] Optionally, a specific implementation of the heating and heat preservation device includes: a heating belt, which is an external electric heating wire, tightly wound on the outer surface 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 connected to a thermostat; a thermostat, which connects the heating belt and the temperature probe, monitors the heating temperature in real time and controls the power of the heating belt; a heat preservation layer, which is made of high-temperature heat-insulating material, wrapped and covered on the outer surface of the heating belt; a clamping belt, which fastens the heat preservation layer to the outer surface of the storage tank and the pipeline 30. In this way, the molten salt is heated by an external electric heating belt, and then covered with a heat preservation material to reduce heat loss, thereby accurately and efficiently realizing the heating and temperature control of the test device.

[0070] The driving air 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, wherein the first storage tank 10 is connected to the driving air pipe 50 to drive the molten salt to flow by adjusting the air pressure difference.

[0071] Optionally, the driving air pipe 50 includes: an air pipe body, the tube body is made of high-temperature alloy material; a first interface is arranged at one end of the air pipe body and connected to the top air inlet of the first storage tank 10; a second interface is arranged at the other end of the air pipe body and connected to the top exhaust port of the second storage tank 20; a regulating valve is arranged on the air pipe body for adjusting the air pressure difference; a pressure gauge is used to monitor the air pressure parameters. The driving air 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 molten salt flow driving force 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 design of the first storage tank 10 is relatively small. In order to facilitate pressurization and cost considerations, high-temperature alloy materials such as nickel-chromium alloy, titanium alloy, etc. are selected to ensure its mechanical sealing performance. The structure of the first storage tank 10 is composed of a cylinder and two end heads. The head adopts an ellipsoidal design without internal protrusions to enhance its pressure bearing capacity. The first storage tank 10 has the characteristics of a thick-walled cylinder and a small diameter. The second storage tank 20 is used to store a large amount of molten salt. It adopts a large volume design. Its material is assembled from multi-layer composite plates. The first layer is stainless steel, and the inside is a surfacing layer to prevent molten salt corrosion; the outer heat-resistant material is used as an insulating layer. The structure of the second storage tank 20 is a large-diameter cylinder and a flat head cover. The connection method with the pipeline 30 is welding, and the top molten salt injection port is flange sealed. The second storage tank 20 has the characteristics of a thin-walled cylinder and a large diameter, and does not need to withstand internal pressure. Such a design reduces costs and meets the functional positioning of the two storage tanks. Optionally, the ratio of the volume of the first storage tank 10 to the volume of the second storage tank 20 is in the range of 1:5-1:40, preferably, the ratio is in the range of 1:5-1:20.

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

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

[0076] Optionally, the pipe 30 support device adopts a flexible support method to release the thermal displacement caused by high temperature. Optionally, the pipe 30 adopts a flexible support technology, which refers to using a bendable pipe as a self-compensating material with bending deformation ability. Figure 3 As shown, elastic supports and hangers are used (for example, by hanging to fix the pipe 30) to adapt to the thermal displacement caused by thermal expansion. Furthermore, the flexible pipe 30 is made of a material with high temperature tolerance and elasticity, which can adapt to thermal expansion and contraction in a high temperature environment and reduce the impact of thermal stress. The design of the flexible pipe 30 enables the pipe 30 to maintain structural integrity when subjected to temperature changes, avoid damage or leakage caused by thermal stress, and thus ensure safety and continuity during the test. In addition, the design of the flexible pipe 30 can also simplify installation and maintenance work, and improve the reliability and durability of the entire test system.

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

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

[0079] It should be pointed out that Figure 1 The gas storage tank 60 is used to provide a gas source for the driving gas pipe and provide compressed gas for the flow of molten salt between the storage tanks. After the compressed gas is adjusted to a suitable pressure by the pressure regulating valve, it enters the driving gas pipe to promote the flow of molten salt. The tail gas treatment device 70 is used to treat the exhaust gas after the test, and the exhaust gas containing corrosive components is filtered and purified to ensure that the exhaust gas emissions of the device meet environmental protection requirements.

[0080] The working principle of the above embodiment 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 a liquid state by a heater.

[0083] Meanwhile, the gas in the first storage tank 10 is kept at normal pressure. The first storage tank 10, the second storage tank 20 and the pipe connecting the two are heated by 30 to 800° C. to ensure that the molten salt flows throughout the system.

[0084] When the molten salt in the second storage tank 20 is heated to a fluid state, the first storage tank 10 is kept at normal pressure, so that the molten salt flows into the first storage tank 10 by gravity. When the first storage tank 10 is full, the gas pressure in the first storage tank 10 is increased, and the gas pressure difference is used to drive the liquid molten salt to flow from the first storage tank 10 to the second storage tank 20.

[0085] Test of heat absorber tube 40:

[0086] When the flowing molten salt passes through the heat absorbing tube 40, the performance of the heat absorbing tube 40 is tested at high temperature, including testing its heat resistance and heat exchange efficiency under high temperature conditions of 800°C.

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

[0088] Heat stress management:

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

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

[0091] Control and monitoring system:

[0092] The I&C system is used to control the operation of the heaters, ensuring that the molten salt is heated evenly throughout the system.

[0093] At the same time, the system also monitors the temperature and flow rate of the molten salt and the gas pressure in the first storage tank 10 and the second storage tank 20 to ensure stability and accuracy during the test.

[0094] Recycling of molten salt:

[0095] After the test is completed, by controlling the gas 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 heat absorption test device realizes effective testing of the heat absorption tube 40 and other related components in an extreme high temperature environment through its unique thermal management, flow control and thermal stress relief design. 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] Improved power generation efficiency: The device can be tested at a high temperature of 800°C, which can significantly improve the efficiency of the solar thermal power generation system compared to the traditional molten salt temperature of 565°C. This temperature increase helps to expand the high temperature application range of the heat absorption tube 40, thereby possibly increasing the operating temperature of the molten salt system, further improving power generation efficiency and reducing power generation costs.

[0099] Simplified design and cost reduction: By simplifying the driving and stirring equipment and removing the built-in heater and vibration source, the design of the device is simpler and more 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, taking cost factors into consideration, thereby effectively reducing the overall construction cost.

[0100] Thermal stress solution: Pipe 30 adopts flexible support, which can effectively eliminate the thermal stress problem of pipeline 30 that may occur under high temperature conditions of 800℃, ensure the service life of pipeline 30, and have the advantage of thermal displacement release.

[0101] High-temperature molten salt medium storage and flow: 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 flow is driven by the pressure difference, which simplifies the flow driving method and improves the operation stability of the test process. The molten salt flows naturally from the second storage tank 20 to the first storage tank 10 by gravity, which greatly reduces 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 high-temperature molten salt medium storage in the second storage tank 20.

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

[0103] It can be seen that the above embodiment provides an efficient and economical way to test the performance of key components under extreme high temperature conditions for the solar thermal power generation system through its innovative design and functions, 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 media in high temperature environments.

[0104] It should be noted that in the application documents of this patent, relational 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 such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0105] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure 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 of protection claimed in this application.

Claims

1. A high-temperature molten salt heat collection test device, characterized in that: include: The first storage tank is used to store high-temperature molten salt; A second storage tank is used to store high-temperature molten salt, and its volume is 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, both ends of which are connected to the first storage tank and the second storage tank respectively, so as to realize the flow of molten salt between the first storage tank and the second storage tank; A heat absorbing tube is arranged on the pipeline, and its high temperature characteristics of heat absorption are tested under the condition of high temperature flow of molten salt, wherein the high temperature characteristics are selected from the following group: elongation of the heat absorbing tube, adhesion characteristics of internal materials; A heating and heat preservation device, arranged outside the first storage tank, the second storage tank and the pipeline, for heating the molten salt to a predetermined test temperature; A driving air pipe, one end of which is connected to the first storage tank and the other end of which is connected to the second storage tank, is used to drive the molten salt to flow in the pipeline, wherein the first storage tank is connected to the driving air pipe to drive the molten salt to flow by adjusting the air pressure difference.

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

3. The testing 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 testing 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 testing device according to claim 1, characterized in that: The device further comprises: a steel platform for supporting the device.

6. The testing device according to claim 1, characterized in that: The device further comprises: a pipeline supporting device, which is used to provide flexible support for the pipeline.

7. The testing device according to claim 1, characterized in that: The pipeline support device adopts a flexible support method to release the thermal displacement caused by high temperature.

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

9. The testing 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 gas pressure; the first storage tank can only drive the flow of the internal molten salt by gas pressure difference.

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