Fused salt storage tank

Abstract

The application discloses a molten salt storage tank, which comprises a tank body, a salt inlet pipeline, a salt inlet ring pipeline and a salt outlet pipeline, the tank body has an inner cavity, a part section of the tank body adjacent to the bottom of the tank body is an expansion joint section, a part section of the salt inlet pipeline is arranged in the inner cavity, the salt inlet ring pipeline is arranged in the tank body and adjacent to the bottom of the tank body, the salt inlet ring pipeline is communicated with one end of the salt inlet pipeline in the inner cavity, a plurality of nozzles are arranged on the salt inlet ring pipeline, and the medium flowing into the salt inlet ring pipeline from the salt inlet pipeline flows into the inner cavity of the tank body through the nozzles, a part section of the salt outlet pipeline is arranged in the inner cavity, and the medium in the tank body enters the salt outlet pipeline through one end of the salt outlet pipeline in the inner cavity and is discharged. The molten salt storage tank of the embodiment improves the tank body structure, reduces the thermal stress concentration of the tank body, improves the reliability of the storage tank and prolongs the service life.

Description

Technical Field

[0001] This invention belongs to the field of thermal energy storage technology, and specifically relates to a molten salt storage tank. Background Technology

[0002] Photothermal molten salt energy storage system is a thermal and electrical energy storage technology developed based on photothermal and energy storage technologies. It can make up for the shortcomings and deficiencies of pumped hydro storage and compressed air energy storage technologies.

[0003] Salt energy storage tanks in related technologies suffer from severe stress concentration under high and low temperature mixed impacts and long-term cycling, which limits their service life. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a molten salt storage tank that can improve the tank structure, reduce the concentration of thermal stress in the tank, and improve the reliability of the storage tank.

[0006] The molten salt storage tank of this invention includes:

[0007] A tank body having an inner cavity, wherein a portion of the tank body adjacent to the bottom of the tank body is an expansion joint section;

[0008] A salt inlet pipe, a portion of which is located within the inner cavity;

[0009] A salt inlet ring pipe is provided inside the tank and adjacent to the bottom of the tank. The salt inlet ring pipe is connected to one end of the salt inlet pipe located in the inner cavity. The salt inlet ring pipe is provided with multiple nozzles. The medium flowing into the salt inlet ring pipe from the salt inlet pipe flows into the inner cavity of the tank through the nozzles.

[0010] A salt outlet pipe, a portion of which is located within the inner cavity, through which the medium in the tank enters and exits the salt outlet pipe from one end located within the inner cavity.

[0011] The molten salt storage tank of this invention improves the tank structure, thereby reducing thermal stress concentration, increasing the reliability and service life of the tank.

[0012] In some embodiments, the expansion joint section has a first end and a second end in the axial direction of the tank body;

[0013] The molten salt storage tank also includes an adjustment component, which is located between the first end and the second end and is used to adjust the amount of expansion joint section in the axial direction of the tank body.

[0014] In some embodiments, the adjustment assembly includes a first rod and a driver, one end of the first rod being connected to a first end of the expansion joint section, the driver being disposed on a second end of the expansion joint section, the driver being connected to the other end of the first rod, and the driver driving the first end and the second end of the expansion joint section to move closer to or further away from each other via the first rod.

[0015] In some embodiments, an Ω-ring is further included, which is disposed between the bottom and the wall of the tank.

[0016] In some embodiments, the Ω-ring has a first arcuate segment and a second arcuate segment, a first side of the first arcuate segment is connected to a first side of the second arcuate segment, a second side of the first arcuate segment is connected to the tank wall, a second side of the second arcuate segment is connected to the tank bottom, and a position of the first arcuate segment adjacent to its second side abuts against a position of the second arcuate segment adjacent to its second side.

[0017] In some embodiments, at least a portion of the Ω-ring is made of a shape memory alloy;

[0018] And / or, the portion of the first arcuate segment adjacent to its first side and the portion of the second arcuate segment adjacent to its first side are elastic;

[0019] And / or, the thickness of the first arc-shaped segment gradually decreases from the second side of the first arc-shaped segment to the first side of the first arc-shaped segment, and the thickness of the second arc-shaped segment gradually decreases from the second side of the second arc-shaped segment to the first side of the second arc-shaped segment.

[0020] In some embodiments, the angle between the spray direction of the nozzle and the axial direction of the tank is 45 degrees to 135 degrees.

[0021] In some embodiments, the salt inlet ring pipe is disposed adjacent to the inner wall surface of the tank, and the nozzle sprays towards the center of the tank.

[0022] In some embodiments, the number of nozzles is 6 to 18;

[0023] And / or, the axial direction of the tank has a first direction and a second direction with opposite directions, some of the nozzles have their spray direction inclined toward the first direction, and the other nozzles have their spray direction inclined toward the second direction.

[0024] In some embodiments, the flow rate of the medium mixing within the tank is 0.1 m / s to 1 m / s;

[0025] And / or, it also includes an aluminum silicate insulation layer, said aluminum silicate insulation layer being disposed on the outer wall surface of the tank;

[0026] And / or, it also includes a support assembly disposed at the lower part of the tank body, the support assembly comprising, from top to bottom, a gravel layer, shale ceramsite, a gravel layer and a concrete layer;

[0027] And / or, the tank body is made of stainless steel or high-nickel alloy, and the operating temperature range of the tank body is 300 degrees Celsius to 800 degrees Celsius;

[0028] And / or, the medium inside the tank is solar salt, carbonate, chloride, or sodium-potassium binary solar salt;

[0029] And / or, it also includes a plurality of detection components, wherein the plurality of detection components are disposed on the tank body to detect at least one of the temperature, pressure and stress of the tank body;

[0030] And / or, the tank body is cylindrical, and the thickness of the side wall of the tank body gradually decreases from bottom to top. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a molten salt storage tank according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of a molten salt storage tank (conveying a medium into its inner cavity) according to another embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the nozzle arrangement in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of a molten salt storage tank (with regulating components) according to another embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the expansion joint section in the molten salt storage tank according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the Ω-ring in the molten salt storage tank according to an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the stress distribution in a molten salt storage tank according to an embodiment of the present invention.

[0038] Figure label:

[0039] 100. Molten salt storage tank;

[0040] 1. Tank body; 11. Expansion joint section; 12. Tank bottom; 13. Tank wall; 14. Alumina silicate insulation layer; 15. Gravel layer; 16. Shale ceramsite; 17. Gravel layer; 18. Concrete layer; 19. Soil;

[0041] 2. Salt inlet pipe;

[0042] 3. Salt inlet ring pipe; 31. Nozzle;

[0043] 4. Salt outlet pipe;

[0044] 5. Ω-ring; 51. First arc-shaped section; 52. Second arc-shaped section;

[0045] 6. Adjustment components. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] The molten salt storage tank according to an embodiment of the present invention is described below.

[0048] like Figures 1 to 7 As shown, the molten salt storage tank 100 of this embodiment of the invention includes a tank body 1, a salt inlet pipe 2, a salt inlet ring pipe 3, and a salt outlet pipe 4.

[0049] The tank body 1 has an inner cavity defined by its bottom 12, wall 13, and top. This inner cavity is a sealed chamber. A section of the tank body 1 adjacent to its bottom is an expansion joint section 11. This expansion joint section 11 is expandable and contractible along its axial direction, thereby compensating for thermal expansion differences, reducing axial loads, decreasing thermal stress on the tank body 1, and preventing strength failure, instability, and pull-out failure of the tank body 1. Optionally, the expansion joint section 11 can be a corrugated structure.

[0050] A section of the salt inlet pipe 2 is located within the inner cavity. The salt inlet ring pipe 3 is located inside the tank body 1 and adjacent to the bottom of the tank body 1. The salt inlet ring pipe 3 is connected to the end of the salt inlet pipe 2 located within the inner cavity. The salt inlet ring pipe 3 is equipped with multiple nozzles 31. The medium flowing from the salt inlet pipe 2 into the salt inlet ring pipe 3 flows into the inner cavity of the tank body 1 through the nozzles 31. In this embodiment, the medium can be molten salt such as solar salt, high-temperature heat transfer oil, carbonate, or chloride. Preferably, solar salt is used in this embodiment. It is understood that the high-temperature molten salt medium transported into the salt inlet pipe 2 first enters the salt inlet ring pipe 3, and then is sprayed into the inner cavity of the tank body 1 through the multiple nozzles 31 to achieve uniform distribution.

[0051] In this embodiment, the tank 1 is generally cylindrical, and the salt inlet ring pipe 3 is generally annular. Multiple nozzles 31 can be arranged at equal intervals along the salt inlet ring pipe 3, so that the molten salt medium injected into the inner cavity of the tank 1 is more evenly dispersed in a certain area, avoiding the spray range from being too concentrated.

[0052] The expansion joint section 11 is positioned corresponding to the salt inlet ring pipe 3, at approximately the same location along the axial direction of the tank body 1. The high-temperature molten salt medium ejected from the nozzle 31 mixes with the low-temperature molten salt in this area. The expansion joint section 11 optimizes the thermal stress concentration in this region, thereby ensuring structural stability. In this embodiment, the molten salt storage tank 100 reduces thermal stress concentration in the tank body 1 by improving its structure, thereby increasing the tank's reliability and service life.

[0053] A section of the salt outlet pipe 4 is located inside the inner cavity. The medium in the tank 1 enters the salt outlet pipe 4 through the end of the salt outlet pipe 4 located inside the inner cavity and is then discharged. The salt outlet pipe 4 is used to discharge the molten salt medium from the tank 1.

[0054] The molten salt storage tank 100 of some other specific embodiments of the present invention is described below.

[0055] like Figures 1 to 7 As shown, the molten salt storage tank 100 of this embodiment of the invention includes a tank body 1, a salt inlet pipe 2, a salt inlet ring pipe 3, a salt outlet pipe 4, an Ω-ring 5, a detection component, and an adjustment component 6.

[0056] The outer wall of the tank 1 is covered with an aluminum silicate insulation layer 14. A support assembly is provided at the bottom of the tank 1, which is also the basic structure of the tank 1 bottom. The support assembly may include, from top to bottom, a gravel layer 15, shale ceramsite 16, a rounded gravel layer 17, and a concrete layer 18. Below the concrete layer 18 is soil 19. In this embodiment, the tank 1 is generally cylindrical, and the thickness of the side walls of the tank 1 gradually decreases from bottom to top.

[0057] The tank body 1 is made of stainless steel or a high-nickel alloy. When stainless steel is used, it can be stainless steel 321, stainless steel 347H, stainless steel 316L, or stainless steel 310S; in this embodiment, stainless steel 321 is used. The operating temperature range of tank body 1 is 300 degrees Celsius to 8600 degrees Celsius. The operating threshold for low-temperature molten salt tank body 1 is 400–500°C, and the operating threshold for high-temperature molten salt tank body is 500–800°C.

[0058] The tank body 1 has an inner cavity defined by its bottom 12, wall 13, and top. This inner cavity is a sealed chamber. A section of the tank body 1 adjacent to its bottom is an expansion joint section 11. This expansion joint section 11 is expandable and contractible along its axial direction, thereby compensating for thermal expansion differences, reducing axial loads, decreasing thermal stress on the tank body 1, and preventing strength failure, instability, and pull-out failure of the tank body 1. Optionally, the expansion joint section 11 can be a corrugated structure.

[0059] The stress distribution within the molten salt storage tank 100 is the thermal stress generated by the mixing of molten salt in the tank body 1 at different temperature ranges. Simultaneously, the molten salt storage tank 100 is also subjected to external loads, including but not limited to earthquakes, rain, snow, and wind loads.

[0060] The expansion joint section 11 has a first end and a second end along the axial direction of the tank body 1. An adjusting assembly 6 is disposed between the first and second ends for adjusting the amount of expansion and contraction of the expansion joint section 11 along the axial direction of the tank body 1. Optionally, the adjusting assembly 6 includes a first rod and a driver. One end of the first rod is connected to the first end of the expansion joint section 11, and the driver is disposed on the second end of the expansion joint section 11. The driver is connected to the other end of the first rod, and the driver drives the first and second ends of the expansion joint section 11 to move closer to or further away from each other via the first rod.

[0061] Multiple detection components are installed on the tank 1 to detect at least one of the following: temperature, pressure, and stress. Specifically, the detection components can be temperature sensors, pressure sensors, or stress sensors. The adjustment component 6 can be linked with the detection components to achieve automated compensation and adjustment. The detection components can be integrated into the expansion joint section 11 for more accurate feedback of detection data.

[0062] An expansion joint section 11 is arranged in the circumferential region at the bottom of the tank 1 where stress concentration occurs. The expansion joint section 11 adopts a multi-layered corrugated structure, with each layer connected by an elastic and flexible material. One or more temperature sensors, pressure sensors, and stress sensors can be integrated into the expansion joint section 11. This embodiment introduces a self-compensation mechanism through the adjustment component 6. When molten salt medium is supplied to the inner cavity of the tank 1, and thermal expansion causes the length of the tank 1 to increase, the expansion joint section 11 can absorb the extra length by compressing or stretching its internal structure, achieving compensation adjustment. This reduces the deformation of the tank 1 while ensuring effective stress control. When thermal contraction causes the length of the tank 1 to decrease, the expansion joint section 11 releases the excess length by restoring its internal structure. This embodiment, by forming an active linkage between the expansion joint section 11 and the adjustment component 6, can improve the overall performance stability of the tank 1 and enhance its ability to handle stress concentration problems.

[0063] An Ω-ring 5 is disposed between the bottom 12 and the wall 13 of the tank body 1. The Ω-ring 5 is also an omega ring, with a shape approximately Ω-shaped. The Ω-ring 5 has a first arc-shaped segment 51 and a second arc-shaped segment 52. The first side of the first arc-shaped segment 51 is connected to the first side of the second arc-shaped segment 52, the second side of the first arc-shaped segment 51 is connected to the tank wall 13, and the second side of the second arc-shaped segment 52 is connected to the bottom 12. Furthermore, the position of the first arc-shaped segment 51 adjacent to its second side abuts against the position of the second arc-shaped segment 52 adjacent to its second side. Further, the thickness of the first arc-shaped segment 51 gradually decreases from its second side to its first side, and the thickness of the second arc-shaped segment 52 gradually decreases from its second side to its first side.

[0064] At least a portion of the Ω-ring 5 is made of shape memory alloy; for example, the entire Ω-ring 5 is made of shape memory alloy. Alternatively, a portion of the first arc-shaped segment 51 near its second side and a portion of the second arc-shaped segment 52 near its second side of the Ω-ring 5 are made of shape memory alloy. The portion of the first arc-shaped segment 51 near its first side and the portion of the second arc-shaped segment 52 near its first side are elastic.

[0065] A section of the salt inlet pipe 2 is located within the inner cavity. The salt inlet ring pipe 3 is located inside the tank body 1 and adjacent to the bottom of the tank body 1. The salt inlet ring pipe 3 is connected to the end of the salt inlet pipe 2 located within the inner cavity. The salt inlet ring pipe 3 is equipped with multiple nozzles 31. The medium flowing from the salt inlet pipe 2 into the salt inlet ring pipe 3 flows into the inner cavity of the tank body 1 through the nozzles 31. In this embodiment, the medium can be molten salt such as solar salt, heat transfer oil, carbonate, or chloride. Preferably, solar salt is used in this embodiment. The high and low temperature molten salt mixing temperatures include: mixing of high-temperature molten salt at 800℃, 700℃, 600℃, or 500℃ with low-temperature molten salt at 400℃ or 300℃. It can be understood that the high-temperature molten salt medium transported into the salt inlet pipe 2 first enters the salt inlet ring pipe 3, and then is sprayed into the inner cavity of the tank body 1 through multiple nozzles 31 to achieve uniform distribution.

[0066] The flow rate of the medium mixing inside tank 1 is 0.1 m / s to 1 m / s. Preferably, the flow rate of the molten salt medium mixing is 0.5 m / s.

[0067] The angle between the spray direction of nozzle 31 and the axial direction of tank 1 is 45 degrees to 135 degrees. In this embodiment, the salt inlet ring pipe 3 is arranged coaxially with tank 1.

[0068] The salt inlet ring pipe 3 is disposed adjacent to the inner wall of the tank 1, and the nozzle 31 sprays towards the center of the tank 1. It is understood that multiple nozzles 31 spray towards the central region of the tank 1 to prevent the high-temperature molten salt medium from being sprayed onto the wall of the tank 1. Preferably, the axial direction of the tank 1 has a first direction and a second direction with opposite directions. The first direction is direction A shown in the figure, and the second direction is direction B shown in the figure. Some nozzles 31 are inclined towards the first direction, while the other nozzles 31 are inclined towards the second direction.

[0069] The number of nozzles 31 is 6 to 18. The salt inlet ring pipe 3 is roughly circular. Multiple nozzles 31 can be arranged at equal intervals along the salt inlet ring pipe 3, so that the molten salt medium injected into the inner cavity of the tank 1 is more evenly dispersed in a certain area, avoiding the spray range being too concentrated.

[0070] For example, the number of nozzles 31 can be 6, 7, 10, 12, 16, or 18. The spray angles of the multiple nozzles 31 can be partially the same, all the same, or different. For example, if there are 12 nozzles 31, 6 nozzles 31 spray in a direction inclined towards the first direction and at a 45-degree angle to the axis of the tank 1 (the angle with the second direction is 135 degrees), and the other 6 nozzles 31 spray in a direction inclined towards the second direction and at a 45-degree angle to the axis of the tank 1 (the angle with the first direction is 45 degrees). For example, there are 12 nozzles 31, of which 4 nozzles 31 spray in a direction that is inclined toward the first direction and forms a 45-degree angle with the axis of the tank body 1 (at which time the angle with the second direction is 135 degrees), 4 nozzles 31 spray in a direction that is inclined toward the second direction and forms a 45-degree angle with the axis of the tank body 1 (at which time the angle with the first direction is 45 degrees), and the last 4 nozzles 31 spray in a direction that is perpendicular to the axis of the tank body 1.

[0071] The expansion joint section 11 is positioned corresponding to the salt inlet ring pipe 3, at approximately the same location along the axial direction of the tank body 1. The high-temperature molten salt medium ejected from the nozzle 31 mixes with the low-temperature molten salt in this area. The expansion joint section 11 optimizes the thermal stress concentration in this region, thereby ensuring structural stability. In this embodiment, the molten salt storage tank 100 reduces thermal stress concentration in the tank body 1 by improving its structure, thereby increasing the tank's reliability and service life.

[0072] Molten salt at high temperature enters the tank 1 of the low-temperature molten salt storage tank 100 through nozzle 31 and mixes with the low-temperature molten salt. Due to the temperature gradient and the thermal stress distribution within the tank 1 during operation, stress concentration areas are identified, and the maximum stress value is compared with the allowable stress of the tank 1 structural material. Then, expansion joint sections 11 and Ω-rings 5 ​​are arranged on the tank 1 in the concentration areas, ensuring that the stress distribution within the tank 1 is far below the structural material's service limit, thus ensuring the long-term safe service of the energy storage tank 1. In this embodiment, the expansion joint section 11 is adjusted by adjusting component 6, thereby ensuring the stability of the tank 1 while ensuring that the stress distribution within the tank 1 is far below the structural material's service limit.

[0073] A section of the salt outlet pipe 4 is located inside the inner cavity. The medium in the tank 1 enters the salt outlet pipe 4 through the end located inside the inner cavity and is then discharged. The salt outlet pipe 4 is used to discharge the molten salt medium from the tank 1. The salt discharge process adopts a straight pipe design, with the straight pipe located at the bottom of the molten salt tank 1. The pump is used to pump the medium to the outside for heat absorption or release, depending on the pump pressure.

[0074] This invention comprehensively solves the defects of existing solar thermal power plant technology in the use of sensible heat storage, such as the impact of high and low temperature mixing of molten salt and the limited service life of storage tanks under long-term operating conditions. Compared with the storage tanks in related technologies, this embodiment adopts a structural optimization method, which can not only avoid stress concentration during the molten salt mixing process, but also provide the advantage of resistance to external loads.

[0075] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A molten salt storage tank, characterized in that, include: A tank body having an inner cavity, wherein a portion of the tank body adjacent to the bottom of the tank body is an expansion joint section; A salt inlet pipe, a portion of which is located within the inner cavity; A salt inlet ring pipe is provided inside the tank and adjacent to the bottom of the tank. The salt inlet ring pipe is connected to one end of the salt inlet pipe located in the inner cavity. The salt inlet ring pipe is provided with multiple nozzles. The medium flowing into the salt inlet ring pipe from the salt inlet pipe flows into the inner cavity of the tank through the nozzles. A salt outlet pipe, a portion of which is located within the inner cavity, through which the medium in the tank enters and exits the salt outlet pipe from one end located within the inner cavity.

2. The molten salt storage tank according to claim 1, characterized in that, The expansion joint section has a first end and a second end in the axial direction of the tank body; The molten salt storage tank also includes an adjustment component, which is located between the first end and the second end and is used to adjust the amount of expansion joint section in the axial direction of the tank body.

3. The molten salt storage tank according to claim 2, characterized in that, The adjustment assembly includes a first rod and a driver. One end of the first rod is connected to a first end of the expansion joint section. The driver is located at a second end of the expansion joint section and is connected to the other end of the first rod. The driver drives the first end and the second end of the expansion joint section to move closer to or further away from each other via the first rod.

4. The molten salt storage tank according to claim 1, characterized in that, It also includes an Ω-ring, which is disposed between the bottom and the wall of the tank.

5. The molten salt storage tank according to claim 4, characterized in that, The Ω-ring has a first arc-shaped section and a second arc-shaped section. The first side of the first arc-shaped section is connected to the first side of the second arc-shaped section. The second side of the first arc-shaped section is connected to the tank wall. The second side of the second arc-shaped section is connected to the bottom of the tank. The position of the first arc-shaped section adjacent to its second side and the position of the second arc-shaped section adjacent to its second side abut against each other.

6. The molten salt storage tank according to claim 5, characterized in that, At least a portion of the Ω-ring is made of shape memory alloy; And / or, the portion of the first arcuate segment adjacent to its first side and the portion of the second arcuate segment adjacent to its first side are elastic; And / or, the thickness of the first arc-shaped segment gradually decreases from the second side of the first arc-shaped segment to the first side of the first arc-shaped segment, and the thickness of the second arc-shaped segment gradually decreases from the second side of the second arc-shaped segment to the first side of the second arc-shaped segment.

7. The molten salt storage tank according to claim 1, characterized in that, The angle between the spray direction of the nozzle and the axial direction of the tank is 45 degrees to 135 degrees.

8. The molten salt storage tank according to claim 7, characterized in that, The salt inlet ring pipe is located adjacent to the inner wall of the tank, and the nozzle sprays towards the center of the tank.

9. The molten salt storage tank according to claim 8, characterized in that, The number of nozzles is 6 to 18; And / or, the axial direction of the tank has a first direction and a second direction with opposite directions, some of the nozzles have their spray direction inclined toward the first direction, and the other nozzles have their spray direction inclined toward the second direction.

10. The molten salt storage tank according to any one of claims 1 to 9, characterized in that, The flow rate of the medium mixing inside the tank is 0.1 m / s to 1 m / s; And / or, it also includes an aluminum silicate insulation layer, said aluminum silicate insulation layer being disposed on the outer wall surface of the tank; And / or, it also includes a support assembly disposed at the lower part of the tank body, the support assembly comprising, from top to bottom, a gravel layer, shale ceramsite, a gravel layer and a concrete layer; And / or, the tank body is made of stainless steel or high-nickel alloy, and the operating temperature range of the tank body is 300 degrees Celsius to 800 degrees Celsius; And / or, the medium inside the tank is solar salt, carbonate, chloride, or sodium-potassium binary solar salt; And / or, it also includes a plurality of detection components, wherein the plurality of detection components are disposed on the tank body to detect at least one of the temperature, pressure and stress of the tank body; And / or, the tank body is cylindrical, and the thickness of the side wall of the tank body gradually decreases from bottom to top.

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