A multifunctional molten salt corrosion testing system
By designing a multifunctional molten salt corrosion testing system, a micro industrial circulating pump and a high-temperature resistant cleaning cloth are used to simulate a flowing molten salt environment. This solves the problem that existing systems cannot simulate actual working conditions, enabling testing of various corrosion types and efficient cleaning, while reducing material costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA SHIPBUILDING NEW POWER CO LTD
- Filing Date
- 2024-12-02
- Publication Date
- 2026-06-02
AI Technical Summary
Existing molten salt corrosion testing systems mainly rely on static immersion and slow strain rate methods, which cannot simulate the flow state of molten salt and various stress interactions in actual working conditions, resulting in a large gap between test results and practical applications.
A multifunctional molten salt corrosion testing system was designed, comprising a corrosion reaction vessel and a molten salt buffer tank. The molten salt medium is circulated through a micro industrial circulating pump. Combined with the design of a viewing window and a high-temperature resistant cleaning cloth, it can simulate corrosion tests under different medium flow rates, temperatures, and stress conditions.
It enables testing of various corrosion types of materials in a flowing molten salt environment, reduces material selection costs, and supports real-time observation and efficient cleaning. It can be applied to solar thermal power plants, molten salt thermal energy storage, and other industrial fields.
Smart Images
Figure CN224317479U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of corrosion testing technology, specifically a multifunctional molten salt corrosion testing system. Background Technology
[0002] Existing molten salt corrosion testing systems mainly use static immersion corrosion testing methods, which involve immersing the test specimen in molten salt. Some systems also use slow strain rate methods, which involve applying a constant tensile stress to the test specimen and immersing it in molten salt medium. In both of these methods, the molten salt medium is static.
[0003] In practical applications, molten salt is mostly in a flowing state within systems and equipment. Besides being affected by static corrosion from molten salt, equipment or materials are also subject to the interaction of medium erosion and other stresses, resulting in completely different characteristics. Existing molten salt corrosion tests operate under limited conditions and can only test molten salt corrosion under static conditions, which differs significantly from actual engineering applications and cannot accommodate tests under multiple conditions.
[0004] Therefore, this utility model provides a multifunctional molten salt corrosion testing system that can superimpose various conditions such as different medium flow rates, different temperatures, and different stress magnitudes to achieve testing of various corrosion types. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.
[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The multifunctional molten salt corrosion testing system of this utility model includes a corrosion reaction vessel and a molten salt buffer tank. The corrosion reaction vessel is provided with a number of fixing slots, and the number of fixing slots are installed on the lower guide plate. An operation hole is opened at the top of the corrosion reaction vessel. The two ends of the corrosion reaction vessel are connected to a circulation pipe through flanges. The circulation pipe is connected to the molten salt buffer tank. An outlet control valve and an inlet control valve are provided on the circulation pipe. A micro industrial circulation pump is provided on the circulation pipe. A salt discharge valve connected to the inside is opened at the bottom of the corrosion reaction vessel.
[0007] Furthermore, an electric heater is installed inside the molten salt buffer tank, and a temperature controller for controlling the electric heater is installed inside the molten salt buffer tank. A temperature transmitter is installed on the circulation pipeline.
[0008] Furthermore, both the upper and lower guide plates are provided with several through holes to increase the disturbance of the flowing molten salt.
[0009] Furthermore, the lower guide plate has a fixing slot for fixing the test piece.
[0010] Furthermore, a viewing window is fixedly installed on the top of the corrosion reactor, and the viewing window is made of high-temperature resistant quartz material.
[0011] Furthermore, the top of the corrosion reactor is provided with a through groove that communicates with the interior. A U-shaped fixing frame is fixedly installed inside the corrosion reactor. A high-temperature resistant cleaning cloth is placed inside the fixing frame. A sliding rod is slidably connected inside the through groove. One end of the sliding rod is inside the fixing frame, and the high-temperature resistant cleaning cloth is covered on the surface of the sliding rod.
[0012] Furthermore, two telescopic components are provided in the through groove, which are symmetrically distributed with sliding rods. The telescopic components are composed of several hollow rectangular plates that are slidably connected. The end of the telescopic component away from the through groove is fixedly connected to the sliding rod.
[0013] Furthermore, the open end of the fixed frame is rotatably connected to two symmetrically arranged baffles via a torsion spring.
[0014] Furthermore, several hemispherical protrusions are fixedly installed inside the fixed frame, and several hollow rectangular plates of the telescopic component are sealed and slidably connected. The protrusions and the telescopic component are connected by a connecting pipe, and the end of the connecting pipe away from the telescopic component is close to the high-temperature resistant cleaning cloth.
[0015] Furthermore, a filter screen is fixedly installed inside the connecting pipe, and two symmetrically arranged arc-shaped guide plates are fixedly installed at the bottom of the filter screen.
[0016] The beneficial effects of this utility model are as follows:
[0017] 1. The multifunctional molten salt corrosion testing system of this utility model uses a micro industrial circulating pump to transport high-temperature molten salt medium from a molten salt buffer tank to a corrosion reactor, thereby scouring the test specimen fixed in a mounting slot within the corrosion reactor. The corrosion reactor is the main reaction device of this testing system. The corrosion reactor is connected to the external circulation pipeline via a flange for easy disassembly. The corrosion reactor has an upper and lower guide plate inside, and an operating hole at the top for placing or removing the test specimen. The operating hole also has a viewing window for observing the condition of the test specimen inside the corrosion reactor. A salt drain valve is installed at the bottom of the corrosion reactor for draining salt after the experiment. The system designed by this utility model can realize molten salt corrosion testing under different medium flow rates, temperatures, and stress levels; realize experimental testing of different corrosion types such as uniform corrosion, stress corrosion, and crevice corrosion; realize corrosion experimental testing in flowing molten salt; and simulate actual application conditions to test materials. This application integrates multiple functions, greatly reducing the material selection cost for use in molten salt media, and has important promotion and application value in the fields of solar thermal power plants, molten salt thermal energy storage technology, and other industrial fields.
[0018] 2. The multifunctional molten salt corrosion testing system of this utility model utilizes a sliding rod within a sliding channel. This rod, along with a telescopic component and a high-temperature resistant cleaning cloth within a fixed frame, slides together, causing the top of the high-temperature resistant cleaning cloth to contact the viewing window. As the cloth moves, it efficiently wipes and cleans the viewing window. Repeating this operation allows for rapid cleaning of the viewing window without opening the corrosion reactor, ensuring uninterrupted experimentation and allowing personnel to observe the conditions inside the reactor in real time. As the high-temperature resistant cleaning cloth enters the fixed frame, it is continuously squeezed and impacted by several protrusions, dislodging any residual molten salt from the top cleaning process. This salt then flows back into the corrosion reactor through the gap between the baffle and the fixed frame. Furthermore, as the sliding rod moves along with the telescopic component, the telescopic component not only shields impurities and seals the corrosive reactor, but also continuously compresses the internal gas as it retracts and returns to its original position. This causes the internal gas to be blown through the connecting pipe into the high-temperature resistant cleaning cloth and the fixed frame, thereby assisting in the cleaning of the high-temperature resistant cleaning cloth and the fixed frame and reducing the molten salt on the surface of the high-temperature resistant cleaning cloth and inside the fixed frame. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings.
[0020] Figure 1 This is a schematic diagram of the workflow of this utility model;
[0021] Figure 2 This is a schematic diagram of the corrosion reaction vessel in this utility model;
[0022] Figure 3 This is a partial cross-sectional view of the corrosion reaction vessel in this utility model;
[0023] Figure 4 This is a structural schematic diagram of the fixed frame in this utility model;
[0024] Figure 5 This utility model Figure 3 A schematic diagram of the structure at point A;
[0025] Figure 6 This utility model Figure 4 A schematic diagram of the structure at point B.
[0026] In the diagram: 1. Corrosion reactor; 2. Operating port; 3. Upper guide plate; 4. Lower guide plate; 5. Viewing window; 6. Fixing slot; 7. Flange; 8. Outlet control valve; 9. Molten salt buffer tank; 10. Electric heater; 11. Miniature industrial circulating pump; 12. Inlet control valve; 13. Circulation pipeline; 14. Temperature transmitter; 15. Salt discharge valve; 16. Temperature controller; 17. Through groove; 18. Fixing frame; 19. Sliding rod; 20. High-temperature resistant cleaning cloth; 21. Telescopic assembly; 22. Baffle; 23. Boss; 24. Connecting pipe; 25. Filter screen; 26. Guide plate. Detailed Implementation
[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0028] like Figures 1 to 6 As shown in the figure, a multifunctional molten salt corrosion testing system according to an embodiment of the present invention includes a corrosion reaction vessel 1 and a molten salt buffer tank 9. The corrosion reaction vessel 1 is provided with a plurality of fixing slots 6, which are installed on the lower guide plate 4. An operation hole 2 is opened on the top of the corrosion reaction vessel 1. The two ends of the corrosion reaction vessel 1 are connected to a circulation pipe 13 through flanges 7. The circulation pipe 13 is connected to the molten salt buffer tank 9. An outlet control valve 8 and an inlet control valve 12 are provided on the circulation pipe 13. A micro industrial circulation pump 11 is provided on the circulation pipe 13. A salt discharge valve 15 connected to the interior is opened at the bottom of the corrosion reaction vessel 1.
[0029] Specifically, an electric heater 10 is installed inside the molten salt buffer tank 9, and a temperature controller 16 for controlling the electric heater 10 is installed inside the molten salt buffer tank 9. A temperature transmitter 14 is installed on the circulation pipe 13. Several through holes are provided on both the upper guide plate 3 and the lower guide plate 4. The fixing slot 6 is fixed to the lower guide plate 4 with bolts. The fixing slot 6 can fix the test piece using bolts and clamps. The test piece is a thin sheet with a regular shape, and its function is to fix the test piece. The test piece can be a thin sheet used to test uniform corrosion, or a C-ring or U-ring used to test stress corrosion. A viewing window 5 is fixedly installed on the top of the corrosion reactor 1. The viewing window 5 is made of high-temperature resistant quartz material.
[0030] During the experiment, a micro industrial circulating pump 11 transports the high-temperature molten salt medium from the molten salt buffer tank 9 to the corrosion reactor 1, scouring the test piece fixed in the fixing slot 6 within the corrosion reactor 1. The corrosion reactor 1 is the main reaction device of this testing system. It is connected to the external circulation pipeline 13 via a flange 7 for easy disassembly (welding can also be used, depending on the specific circumstances). The corrosion reactor 1 contains an upper guide plate 3 and a lower guide plate 4. An operating hole 2 is located at the top of the corrosion reactor 1, allowing for the placement or removal of the test piece and the upper and lower guide plates 3 and 4. The operating hole 2 also has a viewing window 5, allowing observation of the test piece inside the corrosion reactor 1. A salt discharge valve 15 is installed at the bottom of the corrosion reactor 1 for draining salt after the experiment.
[0031] It should be noted that the upper guide plate 3 and the lower guide plate 4 are covered with through holes to increase the turbulence of the flowing molten salt. The molten salt above and below the upper guide plate 3 and the lower guide plate 4 can pass freely, while the flowing molten salt from the circulation pipe 13 is also restricted to a certain extent between the upper guide plate 3 and the lower guide plate 4, thereby increasing the turbulence of the molten salt.
[0032] The miniature industrial circulating pump 11 has a speed-adjustable function, enabling the circulation of molten salt within the system. This places the test specimen inside the corrosion reactor 1 in a flowing molten salt environment. The speed-adjustable function of the miniature industrial circulating pump 11 also allows for molten salt corrosion testing under different flow rate conditions. The temperature controller 16 precisely regulates the molten salt temperature of the system based on the temperature measured by the temperature transmitter 14 on the circulation pipeline 13 and the set temperature value, enabling molten salt corrosion testing under different temperature conditions. The inlet control valve 12 and the outlet control valve 8 primarily control the on / off state of the circulation system and serve as a means of isolating and maintaining the corrosion reactor 1.
[0033] The system designed in this application can perform molten salt corrosion tests under different medium flow rates, temperatures, and stress levels; conduct experimental tests on different corrosion types such as uniform corrosion, stress corrosion, and crevice corrosion; perform corrosion tests in flowing molten salt; and simulate actual application conditions to test materials. This application integrates multiple functions, greatly reducing the material selection cost for applications in molten salt media, and has significant application value in the fields of solar thermal power plants, molten salt thermal energy storage technology, and other industrial fields.
[0034] The top of the corrosion reactor 1 has a through groove 17 that communicates with the interior. A U-shaped fixing frame 18 is fixedly installed inside the corrosion reactor 1. A high-temperature resistant cleaning cloth 20 is placed inside the fixing frame 18. A sliding rod 19 is slidably connected within the through groove 17, with one end of the sliding rod 19 inside the fixing frame 18. The high-temperature resistant cleaning cloth 20 is fitted over the surface of the sliding rod 19. Two telescopic components 21 are symmetrically distributed around the sliding rod 19 within the through groove 17. Each telescopic component 21 is composed of several hollow rectangular plates slidably connected. The end of the telescopic component 21 furthest from the through groove 17 is fixedly connected to the sliding rod 19.
[0035] Specifically, the open end of the fixed frame 18 is rotatably connected to two symmetrically arranged baffles 22 via a torsion spring. Several hemispherical bosses 23 are fixedly installed inside the fixed frame 18. Several hollow rectangular plates of the telescopic assembly 21 are sealed and slidably connected. The bosses 23 and the telescopic assembly 21 are connected by a connecting pipe 24. The end of the connecting pipe 24 furthest from the telescopic assembly 21 is close to the high-temperature resistant cleaning cloth 20. A filter screen 25 is fixedly installed inside the connecting pipe 24, and two symmetrically arranged arc-shaped guide plates 26 are fixedly installed at the bottom of the filter screen 25.
[0036] During operation, when molten salt flows within the corrosion reactor 1 and splashes onto the viewing window 5, after repeated splashing over a long period, molten salt accumulates on the viewing window 5, making it difficult for operators to observe the interior of the corrosion reactor 1 through it. By using the sliding rod 19 within the sliding channel 17, the rod, along with the telescopic component 21 and the high-temperature resistant cleaning cloth 20 within the fixed frame 18, slides together. The high-temperature resistant cleaning cloth 20 then leaves the fixed frame 18 and rotates to open the baffle 22. Freed from the fixed frame 18, the high-temperature resistant cleaning cloth 20 returns to its original size, allowing its top to contact the viewing window 5. As the cloth moves, it efficiently wipes and cleans the viewing window 5. Repeating this process allows for rapid cleaning of the viewing window 5 without opening the corrosion reactor 1, ensuring uninterrupted experimentation while allowing operators to observe the interior of the corrosion reactor 1 in real time. After cleaning, the high-temperature resistant cleaning cloth 20 is brought into the fixed frame 18 by the sliding rod 19. Before entering the fixed frame 18, the high-temperature resistant cleaning cloth 20 rotates again to open the baffle 22, and then enters the fixed frame 18. Inside the fixed frame 18, the high-temperature resistant cleaning cloth 20 is continuously squeezed and impacted by several protrusions 23, thereby shaking off the molten salt remaining from the top cleaning and allowing it to flow back into the corrosion reactor 1 through the gap between the baffle 22 and the fixed frame 18. As the sliding rod 19 moves with the telescopic component 21, the telescopic component 21 not only blocks impurities and seals the corrosion reactor 1, but also continuously compresses the internal gas when it retracts and returns to its original position with the sliding rod 19. This internal gas is then blown through the connecting pipe 24 into the high-temperature resistant cleaning cloth 20 and the fixed frame 18, thus providing auxiliary cleaning for the high-temperature resistant cleaning cloth 20 and the fixed frame 18, reducing the molten salt on the surface of the high-temperature resistant cleaning cloth 20 and inside the fixed frame 18. Meanwhile, the arc-shaped guide plate 26 directs the gas to the surroundings, thereby increasing the cleaning area. At the same time, when the connecting pipe 24 draws air into the telescopic assembly 21, the filter screen 25 can prevent molten salt from entering.
[0037] Working Principle: During the test, the high-temperature molten salt medium in the molten salt buffer tank 9 is transported to the corrosion reactor 1 by the micro industrial circulating pump 11, which scours the test piece fixed in the fixing slot 6 on the lower guide plate 4 in the corrosion reactor 1. The corrosion reactor 1 is the main reaction device of this test system, and it is connected to the external circulation pipeline 13 through the flange 7. The corrosion reactor 1 has an upper guide plate 3 and a lower guide plate 4 inside. There is an operation hole 2 at the top of the corrosion reactor 1, through which the test piece and the upper and lower guide plates 3 and 4 can be placed or removed. There is also a viewing window 5 on the operation hole 2, which allows observation of the test piece inside the corrosion reactor 1. The bottom of the corrosion reactor 1 is equipped with a salt discharge valve 15 for salt discharge after the experiment. The micro industrial circulating pump 11 has a speed adjustment function, which can realize the circulation of molten salt in the system, so that the test piece in the corrosion reactor 1 is in a flowing molten salt environment. The speed adjustment function of the micro industrial circulating pump 11 can also realize molten salt corrosion testing under different flow rate conditions. The temperature controller 16 precisely regulates the molten salt temperature of the system based on the temperature measured by the temperature transmitter 14 on the circulation pipeline 13 and the set temperature value, enabling molten salt corrosion testing under different temperature conditions. The inlet control valve 12 and the outlet control valve 8 mainly control the on / off state of the circulation system and serve as isolation and maintenance points for the corrosion reactor 1.
[0038] When molten salt flows within the corrosion reactor 1 and splashes onto the viewing window 5, after repeated splashing over a long period, molten salt accumulates on the viewing window 5, making it difficult for personnel to observe the situation inside the corrosion reactor 1 through the viewing window 5. The sliding rod 19 within the sliding channel 17 slides along with the telescopic component 21 and the high-temperature resistant cleaning cloth 20 within the fixed frame 18. At this point, the high-temperature resistant cleaning cloth 20 leaves the fixed frame 18 and rotates the top-opening baffle 22. Once detached from the fixed frame 18, the high-temperature resistant cleaning cloth 20 is no longer constrained and returns to its original size, allowing its top to contact the viewing window 5. As the high-temperature resistant cleaning cloth 20 moves, it efficiently wipes and cleans the viewing window 5. After cleaning, the sliding rod 19 carries the high-temperature resistant cleaning cloth 20 into the fixed frame 18. Before entering the fixed frame 18, the high-temperature resistant cleaning cloth 20 rotates the top-opening baffle 22 again. As the high-temperature resistant cleaning cloth 20 enters the fixed frame 18, it is continuously squeezed and impacted by several protrusions 23, thereby shaking off the molten salt remaining during the top cleaning and allowing it to flow back into the corrosion reactor 1 through the gap between the baffle 22 and the fixed frame 18. Furthermore, as the sliding rod 19 moves along with the telescopic component 21, the telescopic component 21, while shielding impurities and sealing the corrosion reactor 1, continuously compresses the internal gas as it retracts and returns with the sliding rod 19. This gas is then blown through the connecting pipe 24 into the high-temperature resistant cleaning cloth 20 and the fixed frame 18, thus providing auxiliary cleaning for both and reducing the amount of molten salt on the surface of the high-temperature resistant cleaning cloth 20 and inside the fixed frame 18. Simultaneously, the arc-shaped guide plate 26 directs the gas to the surrounding area, increasing the cleaning area. When air is drawn into the telescopic component 21 through the connecting pipe 24, the filter screen 25 prevents molten salt from entering.
[0039] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.
[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.
[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A multi-functional molten salt corrosion testing system, characterized by: The system includes a corrosion reactor (1) and a molten salt buffer tank (9). The corrosion reactor (1) is equipped with an upper guide plate (3) and a lower guide plate (4). The corrosion reactor (1) is provided with several fixed slots (6). Several fixed slots (6) are installed on the lower guide plate (4). The corrosion reactor (1) has an operating hole (2) at the top. The two ends of the corrosion reactor (1) are connected to a circulation pipe (13) through flanges (7). The circulation pipe (13) is connected to the molten salt buffer tank (9). The circulation pipe (13) is equipped with an outlet control valve (8) and an inlet control valve (12). The circulation pipe (13) is equipped with a micro industrial circulation pump (11). The bottom of the corrosion reactor (1) is provided with a salt discharge valve (15) that is connected to the interior.
2. The multi-functional molten salt corrosion testing system of claim 1, wherein: An electric heater (10) is installed inside the molten salt buffer tank (9), and a temperature controller (16) for controlling the electric heater (10) is installed inside the molten salt buffer tank (9). A temperature transmitter (14) is installed on the circulation pipeline (13).
3. The multi-functional molten salt corrosion testing system of claim 1, wherein: Both the upper guide plate (3) and the lower guide plate (4) have several through holes.
4. The multi-functional molten salt corrosion testing system of claim 3, wherein: The fixing slot (6) is fixed to the lower guide plate (4) by bolts. The fixing slot (6) can fix the test piece by bolts and clamps. The test piece is a thin sheet with a regular shape, or a C-shaped ring or a U-shaped piece.
5. The multi-functional molten salt corrosion testing system of claim 1, wherein: The top of the corrosion reactor (1) is fixedly equipped with a viewing window (5), which is made of high-temperature resistant quartz material.
6. The multi-functional molten salt corrosion testing system of claim 1, wherein: The top of the corrosion reactor (1) is provided with a through groove (17) that is connected to the interior. A U-shaped fixing frame (18) is fixedly installed inside the corrosion reactor (1). A high-temperature resistant cleaning cloth (20) is provided inside the fixing frame (18). A sliding rod (19) is slidably connected inside the through groove (17). One end of the sliding rod (19) is inside the fixing frame (18). The high-temperature resistant cleaning cloth (20) is sleeved on the surface of the sliding rod (19).
7. The multi-functional molten salt corrosion testing system of claim 6, wherein: The through groove (17) is provided with two telescopic components (21) symmetrically distributed with sliding rods (19). The telescopic components (21) are composed of several hollow rectangular plates that are slidably connected. The end of the telescopic component (21) away from the through groove (17) is fixedly connected to the sliding rods (19).
8. The multi-functional molten salt corrosion testing system of claim 7, wherein: The open end of the fixed frame (18) is rotatably connected to two symmetrically arranged baffles (22) by a torsion spring.
9. The multi-functional molten salt corrosion testing system of claim 8, wherein: Several hemispherical bosses (23) are fixedly installed inside the fixed frame (18). Several hollow rectangular plates of the telescopic component (21) are sealed and slidably connected. The bosses (23) and the telescopic component (21) are connected by a connecting pipe (24). The end of the connecting pipe (24) away from the telescopic component (21) is close to the high-temperature resistant cleaning cloth (20).
10. The multi-functional molten salt corrosion testing system of claim 9, wherein: A filter screen (25) is fixedly installed inside the connecting pipe (24), and two symmetrically arranged arc-shaped guide plates (26) are fixedly installed at the bottom of the filter screen (25).