High-temperature molten salt heat absorption tube testing device

Abstract

The invention relates to a testing technology of a high-temperature molten salt heat-absorbing tube, and discloses a high-temperature molten salt heat-absorbing tube testing device, which comprises a storage tank, the interior of the storage tank is divided into two storage chambers through a separation plate, and each storage chamber is provided with an air inlet and an air outlet; the pipeline is arranged to be connected between the two storage chambers of the storage tank; the heat absorption pipe is arranged on the pipeline; the driving air pipes are respectively connected through the air inlets of the two storage chambers of the storage tank and are used for controlling the flowing of the fused salt and realizing the circulation of the fused salt by adjusting the air pressure difference of the storage chambers; the heaters are respectively arranged at the bottoms of the two storage chambers of the storage tank and are used for heating the fused salt in the storage tank to a preset test temperature; and the stirrers are respectively arranged in the two storage chambers of the storage tank and are used for ensuring that the temperature of the molten salt is uniform through stirring. According to the invention, the test requirements of the 800 DEG C ultra-high temperature heat absorption tube can be met, and accurate, stable and safe performance evaluation can be realized.

Description

Technical Field

[0001] The present 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] With the development of solar thermal power generation technology, higher requirements are put forward for the operating temperature of the heat absorption system. In traditional low-temperature solar thermal power generation systems, the working temperature of molten salt used as the heat transfer medium is about 565°C. This temperature level limits the thermal efficiency and power generation efficiency of the system. In order to further improve the efficiency of solar thermal power generation systems and reduce the power generation cost, it is necessary to significantly increase the working temperature of the heat transfer system. It is expected that in the next-generation medium-temperature solar thermal power generation systems, the working temperature of the molten salt heat transfer system can be increased to about 800°C, which can significantly improve the power generation efficiency, generally predicted to increase by more than 10%. However, the existing heat absorption tube materials and heat exchange elements are difficult to adapt to such high working temperatures, and the existing heat absorption tube testing devices are only applicable to a temperature level of about 600°C and cannot meet the evaluation requirements under ultra-high temperature conditions. Therefore, the research and development of a high-temperature heat absorption tube testing device that can achieve accurate evaluation at 800°C is of great significance for promoting the development of high-efficiency solar thermal power generation systems.

[0003] Furthermore, the existing heat absorption tube testing devices generally use pumps to drive the flow of molten salt, and the pumps will generate vibrations, affecting the test stability under high-temperature conditions. In addition, the existing storage tank design capacity is too small, and there is a safety hazard of molten salt overflow during the test. Moreover, the temperature control accuracy of the existing testing devices is low, unable to ensure the same temperature at different parts and unable to effectively reduce heat loss.

[0004] In summary, the existing technology is difficult to meet the testing requirements of 800°C ultra-high temperature heat absorption tubes, and there is an urgent need to develop a new type of high-temperature testing device to achieve accurate, stable, and safe performance evaluation of 800°C heat absorption tubes, providing key equipment support for the next-generation high-efficiency solar thermal power generation systems. Summary of the Invention

[0005] The purpose of the present application is to provide a high-temperature molten salt heat absorption tube testing device to solve the problems raised in the above background art.

[0006] The present application discloses a high-temperature molten salt heat absorption tube testing device, including:

[0007] A storage tank, the interior of which is divided into two storage chambers by a partition board, and each storage chamber is provided with an air inlet and an air outlet;

[0008] A pipeline, arranged to connect the two storage chambers of the storage tank to realize the flow of molten salt between the chambers;

[0009] The heat absorption tube is arranged on the pipeline and its high-temperature characteristics of heat absorption are tested under the condition of high-temperature molten salt flow. The high-temperature characteristics are selected from the following group: the elongation of the heat absorption tube and the adhesion characteristics of the internal material;

[0010] The driving gas pipes are respectively connected through the air inlet and the replacement gas inlet of the two storage chambers of the storage tank, used to control the flow of molten salt, and the flow of molten salt is realized by adjusting the pressure difference;

[0011] The heaters are respectively arranged at the bottoms of the two storage chambers of the storage tank, used to heat the molten salt in the storage tank to a predetermined test temperature.

[0012] In a preferred example, a stirrer is further included, which is respectively arranged in the two storage chambers of the storage tank, used to ensure the uniform temperature of the molten salt by stirring.

[0013] In a preferred example, the pipeline adopts a flexible support technology, which means using a bendable pipe as a self-compensation material with the ability of bending deformation, and at the same time adopting elastic supports and hangers to adapt to the thermal displacement caused by thermal expansion.

[0014] In a preferred example, the volume of a single storage chamber of the storage tank is larger than the total volume of the molten salt in the test device.

[0015] In a preferred example, the test temperature ≥ 800 °C.

[0016] In a preferred example, a support device is further included, used to support the storage tank and the pipeline.

[0017] In a preferred example, a heat insulation cushion layer is further arranged below the support device.

[0018] In a preferred example, an instrument control system is further included, used to control the test parameters and display the test data.

[0019] In a preferred example, a steel platform is further included, and the storage tank, the pipeline and the heater are fixedly arranged on the steel platform.

[0020] In the embodiments of the present application, the circulation flow of molten salt is realized by using the air pressure difference driving technology to conduct the high-temperature test of the heat absorption tube, avoiding the negative impact on the test caused by the vibration that may be brought by the traditional pump drive, and at the same time reducing the construction cost of the test device. The inside of the storage tank is separated into two storage chambers by a partition board, and the circulation flow of molten salt can be conveniently driven by controlling the air pressure difference between the two chambers. The design of setting the unilateral capacity of the storage tank to be larger than the total amount of molten salt can ensure that no safety accident of molten salt overflowing from the storage tank will occur during the test process. Equipment such as heaters and stirrers are set to precisely control the temperature distribution of the molten salt in the storage tank to ensure the consistency of the test conditions. Flexible pipeline supports are set to adapt to the thermal stress and thermal displacement generated by the pipeline under high-temperature conditions.

[0021] Therefore, the embodiments of the present application have the following technical effects:

[0022] Ultra-high temperature testing ability: The performance testing of ultra-high temperature molten salt heat absorption tubes at 800 °C has been realized, meeting the requirements for the increased use temperature of heat absorption tubes in the next-generation solar thermal power generation system.

[0023] Stable testing system: A single-tank double-drive structure is adopted, and the molten salt is driven to flow by the air pressure difference, avoiding the vibration caused by traditional pump drive and enhancing the testing stability under high-temperature conditions.

[0024] High-temperature stress management: Flexible supports are used for the pipelines to adapt to the thermal stress and thermal displacement under high temperature, ensuring the safety and reliability of the pipeline. This design also helps to release the thermal displacement, further ensuring the stability of the pipeline under high-temperature operating conditions.

[0025] Improved safety: The single-side capacity of the storage tank is sufficient to accommodate the molten salt volume of the entire system, avoiding the safety hazard of molten salt overflow. The air-pressure-driven design of the molten salt flow further improves the safety of the entire device.

[0026] Precise temperature control: Independent heating and heat preservation devices are set for the heat absorption tubes, storage tanks, and pipelines, which can precisely control the temperature of each part and ensure the consistency of the test conditions.

[0027] Energy efficiency optimization: Heat insulation pads and partition boards are set to reduce the heat loss caused by high temperature downward, saving the test energy consumption.

[0028] Compact structure design: The entire testing system has a compact structure, saving the testing space, facilitating installation and maintenance, with low cost and convenient for commercial promotion and application.

[0029] Providing verification means for the solar thermal power generation system: Providing necessary high-temperature reliability verification means for the key equipment of the next-generation solar thermal power generation system, enhancing the practical value and technical application prospects of the device.

[0030] Based on the above points, the high-temperature testing device has significant advantages in technology, especially in terms of stability, safety, and precision under ultra-high temperature conditions, and is very suitable for the evaluation and testing of the performance of high-temperature molten salt heat absorption tubes.

[0031] A large number of technical features are described in the specification of this application, distributed in various technical solutions. If all possible combinations of technical features (i.e., technical solutions) of this application were to be listed, it would make the specification overly lengthy. To avoid this problem, each of the technical features disclosed in the above-mentioned invention content of this application, each of the technical features disclosed in the following various embodiments and examples, and each of the technical features disclosed in the drawings can be freely combined with each other to form various new technical solutions (all of these technical solutions are regarded as having been described in this specification), unless such a combination of 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 of A + B + C + D should not be regarded as having been described because it is technically infeasible, while the solution of A + B + C + E should be regarded as having been described. Brief Description of the Drawings

[0032] Figure 1 is a schematic diagram of the principle of a high-temperature molten salt heat absorption tube test device according to the first embodiment of this application;

[0033] Figure 2 is a schematic diagram of the equipment layout of a high-temperature molten salt heat absorption tube test device according to the first embodiment of this application.

[0034] Figure 3 is another schematic diagram of the equipment layout of a high-temperature molten salt heat absorption tube test device according to the first embodiment of this application.

[0035] In all the drawings, the same reference numerals are used to denote the same elements or structures, where:

[0036] 10: storage tank

[0037] 11: partition board

[0038] 12a, 13a: air inlet

[0039] 12b, 13b: purge gas inlet

[0040] 12c, 13c: air outlet

[0041] 20: heat absorption tube

[0042] 30: pipeline

[0043] 40: drive gas pipe

[0044] 50: heater

[0045] 60: stirrer

[0046] 70: Support device

[0047] 80: Gas storage tank

[0048] 90: Tail gas treatment device

[0049] 100: Elastic support and hanger Detailed implementation manners

[0050] In the following description, many technical details are presented for the better understanding of the present application by the reader. However, those of ordinary skill in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0051] Explanation of some concepts:

[0052] Molten salt: Refers to molten inorganic salts, such as sodium potassium nitrate, etc., which can be used as heat transfer and storage media, and has characteristics such as good thermal stability and high thermal conductivity.

[0053] Heat absorption tube: Refers to a tube device that absorbs light and transfers heat under the condition of molten salt flow. A specially designed absorption coating is adopted.

[0054] Storage tank: A large container used to store and contain molten salt, generally made of corrosion-resistant and high-temperature-resistant materials. The storage tank inside this device is divided into two storage chambers by a partition board.

[0055] Pipeline: A pipe connecting the two storage chambers of the storage tank, used for the circulation of molten salt between the storage tanks. Flexible pipelines are adopted to adapt to thermal stress.

[0056] Drive gas pipeline: The inlet and outlet pipelines set for realizing the flow of molten salt, which drives the molten salt to flow in the pipeline by controlling the pressure difference.

[0057] Heater: A heating device used to heat the molten salt in the storage tank to a set temperature.

[0058] Agitator: Set inside the storage tank chamber, which ensures the uniform temperature of the molten salt in the storage tank through mechanical agitation.

[0059] Instrument control system: System equipment used to monitor and display parameters such as temperature and pressure during the test process.

[0060] The following briefly describes some innovative points of the present application:

[0061] After research and analysis, the inventors of this application creatively proposed a high-temperature molten salt heat absorption tube test device to address the problems pointed out in the above text. The basic concept includes: a storage tank with a partition plate that divides the storage tank into two independent storage chambers to control the storage and flow of molten salt; pipelines are arranged between these chambers to enable the flow of molten salt; the heat absorption tube is installed in the pipeline to test its high-temperature performance under high-temperature flow conditions; the driving gas pipe is connected to each chamber of the storage tank to control the flow of molten salt by adjusting the pressure difference; an external heater is installed on the storage tank to heat the molten salt to a predetermined test temperature; a stirrer is installed in each chamber to ensure the uniformity of the molten salt temperature. Thus, it solves the technical problems such as difficult control of molten salt flow, insufficient thermal stress management, inaccurate temperature control, and insufficient operation safety that may be encountered by traditional high-temperature test devices under ultra-high temperature conditions. This design not only improves the stability and reliability of high-temperature tests, but also enhances the efficiency and safety of the test process through innovative temperature and flow control methods. In addition, the design of this device takes into account the requirements of easy operation and maintenance, which contributes to the technological progress and commercial application in the field of solar thermal power generation.

[0062] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0063] The first embodiment of this application relates to a high-temperature molten salt heat absorption tube test device, and its principle and equipment layout can be referred to Figure 1 and Figure 2 . The high-temperature molten salt heat absorption tube test device includes:

[0064] A storage tank 10, the interior of the storage tank 10 is divided into two storage chambers by a partition plate 11, and each storage chamber is provided with an air inlet (12a, 13a), a replacement gas inlet (12b, 13b), and an air outlet (12c, 13c).

[0065] Furthermore, the storage tank 10 is a large container, and its interior is divided into two independent left and right storage chambers by a partition plate 11 vertically placed in the middle of the storage tank 10 for storing molten salt respectively. Each of the two storage chambers is provided with an air inlet (12a, 13a) at their respective tops for inputting compressed gas, and an air outlet (12c, 13c) at their tops for discharging gas. The settings of the air inlet (12a, 13a) and the air outlet (12c, 13C) are to drive the flow of molten salt in the storage tank by using the pressure difference between the two storage chambers; the settings of the replacement gas inlets (12b, 13b) are for replacing the atmosphere environment of the storage chambers.

[0066] The pipeline 30 is arranged to connect between the two storage chambers of the storage tank 10 to enable the flow of molten salt between the chambers.

[0067] Further, the pipeline 30 is a pipe connecting between the two storage chambers of the storage tank 10 (such as the pipeline 30 shown in Figure 1 ). The two ends of the pipeline 30 are respectively connected to the bottoms of the left and right storage chambers of the storage tank 10, so as to enable the molten salt in the storage tank 10 to flow from the left chamber into the right chamber through the pipeline 30, or from the right chamber into the left chamber, thereby realizing the flow cycle of the molten salt between the two storage chambers.

[0068] The heat absorption pipe 20 is arranged on the pipeline 30 to test its heat absorption and high-temperature performance effects under the condition of high-temperature molten salt medium, such as the elongation of the heat absorption pipe, the adhesion characteristics of the internal material, etc. The heat absorption pipe 20 is a straight pipe with a coating on the outside and is welded to the pipeline 30. The heat absorption pipe is of a two-section tubular type, with the pipeline 30 in the middle and is arranged with supports. It is used to test the performance effect of the heat absorption pipe 20 under the condition of such high-temperature molten salt medium when the molten salt is in a high-temperature state in the pipeline 30. Through testing, the high-temperature performance parameters of the heat absorption pipe 20 under the simulated actual working environment can be evaluated.

[0069] The driving gas pipe 40 is respectively connected through the air inlets (12a, 13a) and the replacement gas inlets (12b, 13b) of the two storage chambers of the storage tank 10, and is used to control the flow of molten salt, and realize the circulation of molten salt by adjusting the pressure difference. The driving gas pipe 40 is two pipes (such as the driving gas pipe 40 shown in Figure 1 ). One pipe is connected to the air inlet 12a and the replacement gas inlet 12b of the left storage chamber of the storage tank 10, and the other pipe is connected to the air inlet 13a and the replacement gas inlet 13b of the right storage chamber. By inputting compressed gas into the air inlet 12a of the left storage chamber through the driving gas pipe 40, a positive pressure can be formed; at the same time, the air outlet 13c of the right storage chamber can be opened for exhaust to form a pressure difference between the left and right storage chambers. The pressure difference between the two storage chambers can push the molten salt in the storage tank 10 to flow from the left high-pressure chamber into the right low-pressure chamber through the pipeline 30 and circulate. By adjusting the magnitude of the air pressure difference between the left and right storage chambers, the flow rate of the molten salt in the storage tank 10 can be controlled. Before starting the heating of the molten salt, inert gas is injected into the storage tank 10 through the driving gas pipe along the replacement gas inlets 12b, 13b, which plays a role in replacing the gas environment in the storage tank 10.

[0070] More specifically, the intake ports (12a, 13a) and the outlet ports (12c, 13c) are arranged to utilize the pressure difference between the two storage chambers to drive the flow of molten salt in the storage tank 10. The specific method is as follows: Compressed gas is input into the intake port (12a or 13a) of one storage chamber to form a high pressure; at the same time, the outlet port (13c or 12c) of the other storage chamber is opened for exhaust to form a low pressure. The pressure difference between the two chambers will push the molten salt to flow from the high-pressure chamber to the low-pressure chamber. The purge gas intake ports (12b, 13b) are for purging the atmosphere environment of the storage chambers. Before starting the heating of the molten salt, inert gas will be injected into the storage tank 10 through the purge gas intake ports (12b, 13b) to replace the original gas in the storage tank 10. The two ends of the pipeline 30 connecting the two storage chambers are arranged at the bottoms of the two storage chambers of the storage tank 10. The flow of molten salt between the chambers is achieved through this pipeline 30. The molten salt flowing out of the high-pressure chamber will flow into the low-pressure chamber through the pipeline 30. The driving gas pipes 40 are respectively connected to the intake ports (12a, 13a) and the purge gas intake ports (12b, 13b) of each storage chamber to provide compressed inert gas, which is the power source for forming the pressure difference and replacing the gas. Through this coordinated operation, the molten salt in the storage tank can be accurately and controllably driven to circulate by using the pressure difference, so as to test the heat absorption pipes arranged on the pipeline 30 under high-temperature conditions.

[0071] The heaters 50 are respectively arranged outside the two storage chambers of the storage tank 10 and are used to heat the molten salt in the storage tank 10 to a predetermined test temperature.

[0072] Furthermore, the heaters 50 are two groups of electric heating devices (such as Figure 1 and Figure 2 the shown heaters 50), which are respectively arranged on the outer walls of the left and right storage chambers of the storage tank 10 and are used to heat the molten salt in the storage tank 10 to raise the temperature of the molten salt to a preset test temperature, such as 800 °C. The two groups of heaters 50 can independently control the heating of the molten salt in the left and right storage chambers respectively, so as to accurately adjust and control the temperature distribution of each part of the molten salt in the storage tank 10 and ensure that a uniform test temperature is reached. This heating method is pollution-free, has high efficiency and rapid reaction.

[0073] The stirrers 60 are respectively arranged in the two storage chambers of the storage tank 10 and are used to ensure uniform temperature of the molten salt by stirring.

[0074] Furthermore, the stirrers 60 are two groups of mechanical stirring devices (such as Figure 1 and Figure 2The shown agitators 60) are respectively arranged at the inner bottoms of the left and right storage chambers of the storage tank 10, and are used to agitate the molten salt in the storage tank 10, so that the molten salt remains in a flowing state in the storage chamber, thereby improving the heat conduction effect of the molten salt in the storage tank 10 and ensuring uniform distribution of the temperature of the molten salt in the left and right storage chambers. The two groups of agitators 60 can independently control the agitation of the molten salt in the left and right storage chambers respectively, and cooperate with the operation of the heater 50 to precisely adjust and control the temperature distribution of each part of the molten salt in the storage tank 10, ensuring that a uniform test temperature is achieved.

[0075] Optionally, the pipeline adopts a flexible support technology, which means using a bendable pipe as a self-compensating material with the ability of bending deformation. At the same time, as Figure 3 shown, an elastic support hanger 100 is adopted to adapt to the thermal displacement caused by thermal expansion. Further, the flexible pipeline 30 refers to a pipeline 30 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 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, improving the reliability and durability of the entire test system.

[0076] Optionally, the volume of a single storage chamber of the storage tank 10 is larger than the total volume of the molten salt in the test device.

[0077] Optionally, the test temperature ≥ 800 °C.

[0078] Optionally, the device further includes a support device 70 for supporting the storage tank 10 and the pipeline 30.

[0079] Optionally, a heat insulation cushion layer is further arranged below the support device 70.

[0080] Optionally, the device further includes an instrument control system for controlling test parameters and displaying test data.

[0081] Optionally, the device further includes a steel platform, and the storage tank 10, the pipeline 30, and the heater 50 are fixedly arranged on this steel platform.

[0082] Optionally, corresponding heat preservation devices are further arranged on parts such as the pipeline 30, the storage tank 10, and the heater 50 of the device.

[0083] Optionally, a molten salt addition port is arranged at the top of the storage tank 10.

[0084] Optionally, a shock absorption device is further arranged at the bottom of the steel platform of the device.

[0085] Optionally, the storage tank 10 and the pipeline 30 are supported on the steel platform by a dedicated bracket support device 70.

[0086] It should be noted that Figure 1 the gas storage tank 80 in provides a gas source for the driving gas pipeline and supplies compressed air to enable the molten salt to flow between the storage tanks. After the compressed air is regulated to an appropriate pressure by a pressure regulating valve, it enters the driving gas pipeline to push the molten salt to flow. The tail gas treatment device 90 is used to treat the exhaust gas after the test, and filter and purify the exhaust gas containing corrosive components to ensure that the tail gas emission of the device meets the environmental protection requirements.

[0087] Working principle:

[0088] The working principle of this test device is: using the air pressure difference to drive the molten salt to circulate between the two storage chambers of the storage tank 10 to test the heat absorption effect of the heat absorption tube 20 under the condition of high-temperature flowing molten salt.

[0089] First, add the molten salt solid raw material into the storage tank 10, and generally add half of the molten salt to each storage chamber. Then start the heater 50 to heat the molten salt in the storage tank 10, and at the same time start the stirrer 60 to stir the molten salt to ensure that the temperature of the molten salt in the storage tank 10 is uniform.

[0090] When the temperature of the molten salt rises to the predetermined test temperature, such as 800 °C, then input compressed gas into the gas port of one storage chamber to form a high pressure; the gas port of the other storage chamber is opened for exhaust to form a low pressure. Under the action of the pressure difference between the two storage chambers, the high-temperature molten salt is pushed to flow from the high-pressure chamber through the pipeline 30 to the low-pressure chamber, completing the fluid circulation.

[0091] The flowing high-temperature molten salt will test the heat absorption effect of the heat absorption tube 20 arranged in the pipeline 30. In other words, during the process of the molten salt flowing in the pipeline, the performance of the heat absorption tube 20 under the high-temperature condition of 800 °C is tested to evaluate its heat absorption effect and stability in the ultra-high-temperature molten salt environment. The test data is monitored and recorded by the instrument control system. After the test is completed, when the temperature of the molten salt drops to a safe temperature, one test process is completed.

[0092] By controlling the pressure difference between the storage tanks 10 and the flow rate of the molten salt, the heat absorption tube 20 can be tested under different working conditions. This test device can repeat the test experiment of the high-temperature heat absorption tube 20 multiple times.

[0093] The above embodiments have the following technical effects:

[0094] Ultra-high temperature test ability: It realizes the performance test of the ultra-high temperature molten salt heat absorption tube 20 at 800 °C, meeting the demand for the increase of the use temperature of the heat absorption tube 20 in the next-generation solar thermal power generation system.

[0095] Stable testing system: Adopting a single-tank dual-drive structure, it uses the air pressure difference to drive the molten salt flow, avoiding the vibration of traditional pump drives and enhancing the testing stability under high-temperature conditions.

[0096] High-temperature stress management: The pipeline adopts flexible supports to adapt to the thermal stress and thermal displacement under high temperature, ensuring the safety and reliability of pipeline 30. This design also helps to release the thermal displacement, further ensuring the stability of the pipeline under high-temperature operating conditions.

[0097] Improve safety: The single-side capacity of the storage tank 10 is sufficient to accommodate the molten salt volume of the entire system, avoiding the safety hazard of molten salt overflow. The air-pressure-driven design of the molten salt flow further enhances the safety of the entire device.

[0098] Precise temperature control: The heat-absorbing pipe 20, the storage tank 10, and the pipeline 30 are all equipped with independent heating and heat preservation devices, which can precisely control the temperature of each part to ensure the consistency of the test conditions.

[0099] Energy efficiency optimization: Insulation pads and isolation plates 11 are set to reduce the heat loss caused by high temperature downward, saving the test energy consumption.

[0100] Compact structure design: The entire testing system has a compact structure, saving the test space, facilitating installation and maintenance, and being convenient for commercial promotion and application.

[0101] Provide verification means for the solar thermal power generation system: Provide necessary high-temperature reliability verification means for the key equipment of the next-generation solar thermal power generation system, enhancing the practical value and technical application prospects of the device.

[0102] Based on the above points, this high-temperature testing device has significant advantages in technology, especially in terms of stability, safety, and precision under ultra-high temperature conditions, and is very suitable for the evaluation and testing of the performance of the high-temperature molten salt heat-absorbing pipe 20.

[0103] 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 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 further 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 additional identical elements in the process, method, article or device comprising said element. In the application documents of this patent, if it is mentioned that a certain act is performed according to a certain element, it means that the act is performed at least according to that element, including two cases: the act is performed only according to that element, and the act is performed according to that element and other elements. Expressions such as multiple, many times, various, etc. include 2, 2 times, 2 kinds, as well as more than 2, more than 2 times, more than 2 kinds.

[0104] All documents mentioned in this application are considered to be integrally included in the disclosure 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 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 required by this application.

Claims

1. A high-temperature molten salt heat absorption tube testing device, characterized in that, it includes: A storage tank, the interior of which is divided into two storage chambers by a partition board, and each storage chamber is provided with an air inlet and an air outlet; A pipeline, arranged to connect the two storage chambers of the storage tank to enable the flow of molten salt between the chambers; A heat absorption tube, arranged on the pipeline to test its high-temperature characteristics of heat absorption 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 tube, the adhesion characteristics of the internal material; A driving gas pipe, respectively connected through the air inlets and replacement gas inlets of the two storage chambers of the storage tank, used to control the flow of molten salt, and realize the circulation of molten salt by adjusting the air pressure difference of the storage chamber; Heaters, respectively arranged at the bottoms of the two storage chambers of the storage tank, used to heat the molten salt in the storage tank to a predetermined test temperature.

2. The testing device according to claim 1, characterized in that, it further includes stirrers, respectively arranged in the two storage chambers of the storage tank, used to ensure the uniform temperature of the molten salt by stirring.

3. The testing device according to claim 1, characterized in that, The pipeline adopts a flexible support technology, and the flexible support technology refers to using a bendable pipe as a self-compensation material, which has the ability of bending deformation, and at the same time adopts elastic supports and hangers to adapt to the thermal displacement caused by thermal expansion.

4. The testing device according to claim 1, characterized in that, The volume of a single storage chamber of the storage tank is greater than the total volume of the molten salt in the testing device.

5. The testing device according to claim 1, characterized in that, The test temperature ≥ 800 °C.

6. The testing device according to claim 1, characterized in that, it further includes a support device, used to support the storage tank and the pipeline.

7. The testing device according to claim 6, characterized in that, An insulating cushion layer is further arranged below the support device.

8. The testing device according to claim 1, characterized in that, it further includes an instrument control system, used to control test parameters and display test data.

9. The testing device according to claim 1, characterized in that, it further includes a steel platform, and the storage tank, the pipeline, and the heaters are fixedly arranged on the steel platform.

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