A composite foundation for a large-diameter high-temperature molten salt storage tank and a method of using the same

Abstract

The present invention provides a composite foundation for a large-diameter high-temperature molten salt storage tank and a method for using the same, including a variable-rigidity top plate, a rigid bottom plate and an outer ring wall, the variable-rigidity top plate is connected to the outer ring wall, the rigid bottom plate and the outer ring wall are cast in one piece, the variable-rigidity top plate is close to the bottom of the storage tank, an outer insulation layer is provided between the variable-rigidity top plate and the outer ring wall, a middle heat-insulating filling layer is provided between the variable-rigidity top plate and the rigid bottom plate, and compartment steel beams are provided at equal intervals in the vertical direction in the middle heat-insulating filling layer. The present invention directly bears the load of the tank top, tank wall and tank insulation layer and the vertical pressure of the molten salt in the storage tank through the variable-rigidity conical top plate and the special-shaped ring beam, bears all vertical loads and foundation reaction forces through the rigid bottom plate, bears the lateral pressure of the upper molten salt and the insulation material through the outer ring wall, and the middle heat-insulating filling layer realizes heat insulation and heat preservation. Each part has a clear division of labor and works in coordination. It is a new composite foundation that can meet the requirements of bearing and heat preservation of large-diameter high-temperature molten salt storage tanks.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation structures of large-diameter heat storage tanks, and in particular relates to a composite foundation of a large-diameter high-temperature molten salt storage tank and a method of using the composite foundation. Background Art

[0002] Steel tank foundations currently belong to the field of conventional energy structures in the petrochemical industry. However, in the field of new energy, especially in tower solar thermal power stations, a tank foundation that can store and store heat in a long-lasting and efficient manner is required. The existing relevant tank foundation specifications are somewhat thin, the design elements are not considered comprehensively, and the scope of application is too narrow. At present, there are two major difficulties and problems in the design of large high-temperature tank foundations in my country's solar thermal power stations:

[0003] First, the liquid molten salt has high heat storage efficiency in the storage tank. In order to ensure the power generation efficiency of the power plant, the temperature of the liquid molten salt should not drop by more than 1°C after standing for 24 hours. This puts forward strict thermal insulation requirements for the foundation that is in direct contact with the bottom plate of the storage tank. It must not only meet the temperature field heat exchange calculation, but also the selected insulation material must participate in stress and deformation.

[0004] Second, the economy of the tank foundation and the operability of the construction. The insulation materials selected in the design are economical, the structural measures can achieve convenient and quick construction, and ensure the overall coordination of the foundation bottom plate, top plate and insulation materials. Summary of the invention

[0005] The purpose of the present invention is to provide a composite foundation for a large-diameter high-temperature molten salt storage tank to overcome the above-mentioned technical problems existing in the prior art.

[0006] Another object of the present invention is to provide a large-diameter high-temperature molten salt storage tank composite foundation and a method of using the same, which effectively prevents the strength of the bottom plate concrete from decreasing and ensures the safety of the foundation bearing capacity.

[0007] To this end, the technical solution provided by the present invention is as follows:

[0008] A composite foundation for a large-diameter high-temperature molten salt storage tank comprises a variable-rigidity top plate, a rigid bottom plate and an outer ring wall, wherein the variable-rigidity top plate is connected to the upper portion of the outer ring wall, the rigid bottom plate and the outer ring wall are cast as one piece, the variable-rigidity top plate is close to the bottom of the storage tank, an outer insulation layer is provided between the variable-rigidity top plate and the outer ring wall, an intermediate heat-insulating filling layer is provided between the variable-rigidity top plate and the rigid bottom plate, and compartment steel beams are provided at equal intervals in the vertical direction on the intermediate heat-insulating filling layer.

[0009] The variable stiffness top plate includes a special-shaped ring beam and a conical top plate. The conical top plate is a variable thickness plate. The conical top plate is fixed to the inner circle of the special-shaped ring beam. The special-shaped ring beam is arranged under the tank wall of the storage tank. The conical top plate is close to the bottom plate of the storage tank.

[0010] A temperature measuring layer is provided in the rigid bottom plate, a plurality of thermocouples are uniformly pre-buried in the temperature measuring layer, a plurality of ventilation pipes are provided under the temperature measuring layer, the thermocouple electrical signals are connected to a control cabinet, the control cabinet is electrically connected to a fan and an alarm, and one end of the ventilation pipe is connected to an air outlet of the fan.

[0011] The rigid bottom plate is a reinforced concrete circular bottom plate, and annular and radial steel bars are arranged inside the rigid bottom plate.

[0012] The middle heat insulation filling layer includes shale ceramsite and ceramic sand. The particle size of the shale ceramsite is 5-20 mm, the particle size of the ceramic sand is not more than 3 mm, and the mass ratio of the shale ceramsite to the ceramic sand is 7:3.

[0013] The compartment steel beams are vertically arranged in three layers, and each layer is arranged in a hexagonal shape.

[0014] The special-shaped ring beam is in a stepped shape, and the outer insulation layer between the special-shaped ring beam and the outer ring wall is in a stepped shape that is wide at the top and narrow at the bottom.

[0015] The conical top plate slopes upward at 1.5% to the center of the tank, and the thickness of the connection between the conical top plate and the special-shaped ring beam is R1 / 100, where R1 is the radius of the tank.

[0016] The thickness of the conical top plate is 100-150 mm, the thickness of the middle heat insulation filling layer is 1.5-2 m, the thickness of the rigid bottom plate is 400-800 mm, and the thickness of the outer ring wall is 500-600 mm.

[0017] A method for using a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the bottom of the storage tank is closely attached to a variable-rigidity top plate, the storage tank is supported by the cooperation of the variable-rigidity top plate, an outer ring wall and a rigid bottom plate, and thermal insulation is achieved through an intermediate thermal insulation filling layer. When the temperature measured by a thermocouple reaches 60% to 70% of the limit temperature of the rigid bottom plate concrete, an alarm sounds, and at the same time a control cabinet turns on a fan to transport air through a ventilation pipe to take away the heat.

[0018] The beneficial effects of the present invention are:

[0019] The composite foundation for a large-diameter high-temperature molten salt storage tank provided by the present invention directly bears the loads of the tank top, tank wall and tank insulation layer and the vertical pressure of the molten salt in the tank through a variable-rigidity conical top plate and a special-shaped ring beam, bears all vertical loads and foundation reaction forces through a rigid bottom plate, bears the lateral pressure of the upper molten salt and insulation materials through an outer ring wall, and realizes thermal insulation and heat preservation through a middle thermal insulation filling layer. Each part has a clear division of labor and works in coordination. The composite foundation can meet the requirements of both load bearing and heat preservation for a large-diameter high-temperature molten salt storage tank.

[0020] The present invention vertically arranges compartment steel beams in the middle insulation filling layer to divide the circle into several equal parts of equal volume. At the same time, the construction process achieves the "double uniformity" control standard, realizing the compaction degree required by the insulation bulk material design and the uniform settlement of the tank body.

[0021] The present invention provides a special-shaped ring beam and a top plate with edge stiffness. In the connection area between the vertical wall and the bottom plate of the storage tank, due to the discontinuity of the vertical wall, under the joint action of the lateral molten salt pressure and high-temperature expansion deformation, the stress in this area changes suddenly and is complex. The ring beam with a certain rigidity can well bear the internal force and limit the expansion deformation of the tank wall. At the same time, in terms of thermal insulation performance, the stepped outer insulation layer filled with the special-shaped ring beam and the outer ring wall, which is wide at the top and narrow at the bottom, effectively reduces the high heat flux loss caused by the extension of the rigid bottom plate relative to the vertical wall. The variable thickness conical top plate is laid on the middle thermal insulation filling layer, and slopes upward at a slope of 1.5%, which can well adapt to the vertical deformation of the upper molten salt. This combination of a strong ring beam and a weak top plate works as a whole, with a clear division of labor, and both force transmission and heat conduction are scientific and reasonable.

[0022] The middle insulation filling layer uses shale ceramsite and ceramic sand, which meets the requirements of the thermal-solid coupling calculation model and fully meets the overall temperature field heat exchange calculation. In order to meet the bonding between ceramsite and ceramic sand, combined with the on-site large-diameter operation construction process, ceramic sand and ceramsite are mixed in a ratio of 3:7.

[0023] The rigid bottom plate and the outer ring wall of the present invention are rigidly connected by integral casting, and annular and radial steel bars are arranged in the rigid bottom plate to bear the self-weight load of the molten salt, live load, wind load, temperature effect and bending moment, shear force and punching internal force generated by the inclination of the tank body; the outer ring wall is used to bear the total horizontal deformation of the foundation, while constraining the middle insulation layer, strengthening the integrity of the foundation, and ensuring uniform foundation settlement.

[0024] If an accident occurs and the temperature measured by the thermocouple reaches 60% to 70% of the ultimate temperature of the bottom slab concrete, the alarm system will operate and the fan will be turned on in time, using the ventilation duct to transport air with low heat flux density to the bottom slab to bring out the heat, effectively preventing the strength of the bottom slab concrete from decreasing and ensuring the safety of the foundation bearing capacity.

[0025] The composite foundation of the present invention was first applied to the Qinghai Gonghe 50MW solar thermal power generation project (the first batch of national solar thermal demonstration projects). The variable stiffness top plate, the middle insulation layer and the rigid bottom plate and the outer ring wall work together to bear force in a coordinated manner, breaking through the limitations of conventional tank foundations and solving a series of difficult problems with large-diameter high-temperature tank foundations. The foundation materials of the present invention mainly include heat-resistant concrete, ordinary concrete and insulating granular bulk, which is convenient for project procurement and construction, while shortening the construction period, meeting the requirements of green engineering, and realizing a single large-diameter tank foundation to replace multiple-diameter tanks, thereby achieving the purpose of optimizing site layout and saving land. The composite thermal insulation and heat-insulating foundation of the present invention has certain economy and reliable practicality in the field of solar thermal power station engineering at home and abroad, and has broad application prospects in the field of new energy heat storage and heat storage.

[0026] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a plan view of a composite basic structure;

[0028] Figure 2 The present invention is a cross-sectional schematic diagram of a composite foundation structure;

[0029] Figure 3 yes Figure 2 Schematic diagram of the medium variable stiffness top plate structure;

[0030] Figure 4 This is a schematic diagram of an implementation method of a compartment steel beam with a middle heat insulation filling layer;

[0031] Figure 5 It is a schematic diagram of the connection structure between the outer ring wall and the rigid bottom plate;

[0032] Figure 6 It is a plan view of the ventilation duct.

[0033] In the figure:

[0034] Description of reference numerals:

[0035] 1. Conical top plate; 2. Special-shaped ring beam; 3. Middle thermal insulation filling layer; 4. Compartment steel beam; 5. External insulation layer; 6. Rigid bottom plate; 7. Ventilation pipe; 8. External ring wall; 9. Temperature expansion joint; 10. Conical surface slope line; 11. Storage tank. DETAILED DESCRIPTION

[0036] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0037] It should be noted that, in the present invention, the top, bottom, left and right in the figure are deemed to be the top, bottom, left and right of the composite foundation of the large-diameter high-temperature molten salt storage tank described in this specification.

[0038] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0039] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0040] Embodiment 1:

[0041] The present embodiment provides a composite foundation for a large-diameter high-temperature molten salt storage tank, including a variable-rigidity top plate, a rigid bottom plate 6 and an outer ring wall 8, wherein the variable-rigidity top plate is connected to the upper portion of the outer ring wall 8, the rigid bottom plate 6 and the outer ring wall 8 are cast as one piece, the variable-rigidity top plate is close to the bottom of the storage tank 11, an outer insulation layer 5 is provided between the variable-rigidity top plate and the outer ring wall 8, an intermediate heat-insulating filling layer 3 is provided between the variable-rigidity top plate and the rigid bottom plate 6, and the intermediate heat-insulating filling layer 3 is provided with compartment steel beams 4 at equal intervals in the vertical direction.

[0042] The composite foundation for a large-diameter high-temperature molten salt storage tank provided by the present invention directly bears the loads of the tank top, tank wall and tank insulation layer and the vertical pressure of the molten salt in the storage tank 11 through the variable-rigidity conical top plate 1 and the special-shaped ring beam 2, bears all vertical loads and foundation reaction forces through the rigid bottom plate 6, bears the lateral pressure of the upper molten salt and insulation materials through the outer ring wall 8, and realizes thermal insulation and heat preservation through the middle thermal insulation filling layer 3. The various parts have clear division of labor and work in coordination. The composite foundation can meet the requirements of bearing and heat preservation for a large-diameter high-temperature molten salt storage tank 11.

[0043] Embodiment 2:

[0044] On the basis of Example 1, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the variable stiffness top plate comprises a special-shaped ring beam 2 and a conical top plate 1, wherein the conical top plate 1 is a variable thickness plate, wherein the conical top plate 1 is fixed to the inner ring of the special-shaped ring beam 2, wherein the special-shaped ring beam 2 is arranged under the tank wall of the storage tank 11, and the conical top plate 1 is close to the bottom plate of the storage tank 11. Figure 1 , Figure 2 shown.

[0045] In the figure, R0 is the radius of the cone, R1 is the radius of the storage tank 11, R2 is the radius of the ring beam, and R3 is the radius of the outer ring wall 8. When constructing the variable stiffness top plate, it is cast in five parts, namely the cone in the center part and the four 90° sectors around the cone. A temperature expansion joint 9 is left between the cone and the four sectors, and a temperature expansion joint 9 is also left between two adjacent sectors.

[0046] The present invention directly bears the loads of the tank top, tank wall and tank insulation layer through the special-shaped ring beam 2, and directly bears the vertical pressure of the molten salt in the storage tank 11 through the variable rigidity conical top plate 1 close to the bottom plate of the storage tank 11.

[0047] Embodiment 3:

[0048] On the basis of Example 1, this embodiment provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein a temperature measuring layer is provided in the rigid bottom plate 6, a plurality of thermocouples are uniformly pre-buried in the temperature measuring layer, a plurality of ventilation pipes 7 are provided under the temperature measuring layer, and the electrical signals of the thermocouples are connected to a control cabinet, the control cabinet is electrically connected to a fan and an alarm, and one end of the ventilation pipe 7 is connected to the air outlet of the fan.

[0049] like Figure 2 and Figure 6 As shown, one end of the ventilation pipe 7 is 90° and is connected to the air outlet of the fan. Thermocouples for measuring temperature are evenly embedded in the circular bottom plate, and the thermocouples are gathered at one place at the edge of the foundation. Ventilation pipes 7 are arranged below the thermocouple layer with a spacing of 900 mm.

[0050] When the temperature measured by the thermocouple reaches 60% to 70% of the ultimate temperature of the bottom slab concrete, the alarm system will work and turn on the fan in time, using the ventilation pipe 7 to transport air with low heat flux density to the bottom slab to take out the heat, effectively preventing the strength of the bottom slab concrete from decreasing and ensuring the safety of the foundation bearing capacity.

[0051] Embodiment 4:

[0052] On the basis of Example 1, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the rigid bottom plate 6 is a reinforced concrete circular bottom plate, and the rigid bottom plate 6 is provided with annular and radial steel bars.

[0053] like Figure 5 As shown, the rigid bottom plate 6 is integrally cast and rigidly connected to the outer ring wall 8. Annular and radial steel bars are arranged inside the rigid bottom plate 6 to bear the deadweight load of the molten salt, live load, wind load, temperature effect, bending moment, shear force and punching internal force caused by the tilt of the tank body.

[0054] Embodiment 5:

[0055] Based on Example 1, this embodiment provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the middle thermal insulation filling layer 3 includes shale ceramsite and ceramic sand, the particle size of the shale ceramsite is 5-20 mm, the particle size of the ceramic sand is not more than 3 mm, and the mass ratio of the shale ceramsite to the ceramic sand is 7:3.

[0056] The present invention provides a thermal insulation bulk material assembly with low cost and convenient construction. The bulk material body adopts shale ceramsite and ceramic sand, meets the requirements of the thermo-solid coupling calculation model, and fully meets the overall temperature field heat exchange calculation. The cylinder pressure strength of the thermal insulation bulk material is not less than 5MPa, and the thermal conductivity is not greater than 0.45. In order to meet the bonding between ceramsite and ceramic sand, combined with the on-site large-diameter operation construction process, the ceramic sand and ceramsite are mixed in a ratio of 3:7.

[0057] Embodiment 6:

[0058] On the basis of Example 1, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the compartment steel beams 4 are vertically arranged in three layers, and each layer is arranged in a hexagonal shape.

[0059] like Figure 4 As shown, regular hexagonal channel steels are vertically arranged in the middle insulation filling layer 3 to divide the circle into several equal parts of equal volume. At the same time, the construction process meets the "double uniformity" control standard, achieving the compaction degree required by the insulation bulk material design and the uniform settlement of the tank body.

[0060] Embodiment 7:

[0061] Based on Example 2, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank, wherein the special-shaped ring beam 2 is a stepped type, and the outer insulation layer 5 between the special-shaped ring beam 2 and the outer ring wall 8 is a stepped type with a wide top and a narrow bottom. Figure 2 and Figure 3 shown.

[0062] In terms of thermal insulation performance, the stepped thermal insulation layer filled by the special-shaped ring beam 2 and the outer ring wall 8, which is wide at the top and narrow at the bottom, effectively reduces the high heat flux density loss caused by the outward extension of the bottom plate relative to the vertical wall.

[0063] Embodiment 8:

[0064] Based on Example 2, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank.

[0065] The conical top plate 1 slopes upward at 1.5% to the center of the storage tank 11 . The thickness of the connection between the conical top plate 1 and the special-shaped ring beam 2 is R1 / 100, where R1 is the radius of the storage tank 11 .

[0066] like Figure 2 As shown, the variable stiffness top plate is laid on the middle heat insulation filling layer 3. Figure 1As shown, the conical slope is formed from the conical surface starting line 10 at a slope of 1.5% toward the center of the storage tank 11, which can well adapt to the vertical deformation of the upper molten salt. The special-shaped ring beam 2 and the conical top plate 1 are connected by a variable thickness and variable stiffness transition.

[0067] Embodiment 9:

[0068] Based on Example 2, this example provides a composite foundation for a large-diameter high-temperature molten salt storage tank.

[0069] The thickness of the conical top plate 1 is 100-150 mm, the thickness of the middle heat insulation filling layer 3 is 1.5-2 m, the thickness of the rigid bottom plate 6 is 400-800 mm, and the thickness of the outer ring wall 8 is 500-600 mm.

[0070] like Figure 2 As shown, t1 is the thickness of the conical top plate 1 , t2 is the thickness of the middle heat insulation filling layer 3 , t3 is the thickness of the rigid bottom plate 6 , and t0 is the thickness of the outer ring wall 8 .

[0071] Embodiment 10:

[0072] The present embodiment provides a method for using a composite foundation for a large-diameter high-temperature molten salt storage tank, in which the bottom of the storage tank 11 is closely attached to the variable-rigidity top plate, the storage tank 11 is supported by the cooperation of the variable-rigidity top plate, the outer ring wall 8 and the rigid bottom plate 6, and thermal insulation is achieved by the intermediate thermal insulation filling layer 3. When the temperature measured by the thermocouple reaches 60% to 70% of the concrete limit temperature of the rigid bottom plate 6, the alarm sounds, and at the same time, the control cabinet turns on the fan to transport air through the ventilation pipe 7 to take away the heat.

[0073] The composite foundation of the present invention was first applied to the Qinghai Gonghe 50MW solar thermal power generation project (the first batch of national solar thermal demonstration projects). The variable stiffness top plate, the middle insulation layer and the rigid bottom plate 6 and the ring wall work together to bear the force in coordination, breaking through the limitations of the conventional tank 11 type foundation, and solving a series of difficult problems of the large diameter high temperature tank 11 foundation. The foundation materials of the present invention mainly include heat-resistant concrete, ordinary concrete and insulating granular bulk, which is convenient for the procurement and construction of the project, and can shorten the construction period, meet the requirements of green engineering, and realize the replacement of multiple diameter tanks 11 with a single large diameter tank 11 foundation, so as to achieve the purpose of optimizing site layout and saving land. The composite thermal insulation and heat-insulating foundation of the present invention has certain economy and reliable practicality in the field of solar thermal power station engineering at home and abroad, and has broad application prospects in the field of new energy heat storage and heat storage.

[0074] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A composite foundation for a large-diameter high-temperature molten salt storage tank, characterized in that: The invention comprises a variable stiffness top plate, a rigid bottom plate (6) and an outer ring wall (8), wherein the variable stiffness top plate is connected to the upper part of the outer ring wall (8), the rigid bottom plate (6) and the outer ring wall (8) are cast in one piece, the variable stiffness top plate is closely attached to the bottom of the storage tank (11), an outer thermal insulation layer (5) is provided between the variable stiffness top plate and the outer ring wall (8), an intermediate thermal insulation filling layer (3) is provided between the variable stiffness top plate and the rigid bottom plate (6), and the intermediate thermal insulation filling layer (3) is provided with compartment steel beams (4) at equal intervals along the vertical direction; The variable stiffness top plate comprises a special-shaped ring beam (2) and a conical top plate (1), the conical top plate (1) being a variable thickness plate, the conical top plate (1) being fixedly arranged on the inner ring of the special-shaped ring beam (2), the special-shaped ring beam (2) being arranged under the tank wall of the storage tank (11), and the conical top plate (1) being closely attached to the bottom plate of the storage tank (11); The special-shaped ring beam (2) is in a stepped shape, and the outer insulation layer (5) between the special-shaped ring beam (2) and the outer ring wall (8) is in a stepped shape that is wide at the top and narrow at the bottom; The conical top plate (1) slopes upward at 1.5% to the center of the storage tank (11), and the thickness of the connection between the conical top plate (1) and the special-shaped ring beam (2) is R1 / 100, where R1 is the radius of the storage tank (11).

2. A composite foundation for a large-diameter high-temperature molten salt storage tank according to claim 1, characterized in that: The rigid bottom plate (6) has a temperature measuring layer in it, a plurality of thermocouples are uniformly pre-buried in the temperature measuring layer, a plurality of ventilation pipes (7) are arranged under the temperature measuring layer, the thermocouple electrical signals are connected to a control cabinet, the control cabinet is electrically connected to a fan and an alarm, and one end of the ventilation pipe (7) is connected to an air outlet of the fan.

3. The composite foundation of a large-diameter high-temperature molten salt storage tank according to claim 1 is characterized in that: The rigid bottom plate (6) is a reinforced concrete circular bottom plate, and annular and radial steel bars are arranged inside the rigid bottom plate (6).

4. The composite foundation of a large-diameter high-temperature molten salt storage tank according to claim 1 is characterized in that: The middle heat-insulating filling layer (3) comprises shale ceramsite and ceramic sand, the particle size of the shale ceramsite is 5-20 mm, the particle size of the ceramic sand is not greater than 3 mm, and the mass ratio of the shale ceramsite to the ceramic sand is 7:

3.

5. The composite foundation of a large-diameter high-temperature molten salt storage tank according to claim 1 is characterized in that: The compartment steel beams (4) are vertically arranged in three layers, and each layer is arranged in a hexagonal shape.

6. The composite foundation of a large-diameter high-temperature molten salt storage tank according to claim 1 is characterized in that: The thickness of the conical top plate (1) is 100-150 mm, the thickness of the middle heat insulation filling layer (3) is 1.5-2 m, the thickness of the rigid bottom plate (6) is 400-800 mm, and the thickness of the outer ring wall (8) is 500-600 mm.

7. The method for using a composite foundation of a large-diameter high-temperature molten salt storage tank according to claim 2, characterized in that: The bottom of the storage tank (11) is tightly attached to the variable stiffness top plate, and the storage tank (11) is supported by the cooperation of the variable stiffness top plate, the outer ring wall (8) and the rigid bottom plate (6). The heat insulation is achieved by the intermediate heat insulation filling layer (3). When the temperature measured by the thermocouple reaches 60% to 70% of the limit temperature of the concrete of the rigid bottom plate (6), the alarm sounds, and the control cabinet turns on the fan at the same time, and the air is transported through the ventilation pipe (7) to remove the heat.

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