High-temperature heat storage structure based on solid waste variable stiffness support and dynamic stress compensation

Abstract

The embodiment of the invention provides a high-temperature heat storage structure based on solid waste-based variable stiffness support and dynamic stress compensation and a preparation method of the high-temperature heat storage structure. The heat storage structure comprises a core assembly filled with a solid-waste-based composite phase change material, an intelligent regulation and control assembly arranged on the periphery of the core assembly in a sleeving mode, a variable-rigidity flexible constraint assembly arranged on the periphery of the intelligent regulation and control assembly in a sleeving mode, and a heat blocking assembly arranged at the upper end of the core assembly in a sealed mode. Wherein the intelligent regulation and control assembly performs self-regulation according to the detected strain information of the core assembly and generates deformation for compensating thermal stress. The solid-waste-based high-energy-storage phase-change material is used as a core material of the core assembly to store heat, so that the urban solid waste emission can be effectively reduced, the environmental pollution is reduced, and the environmental protection is facilitated.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of high-temperature thermal storage technology, specifically relating to a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, and its preparation method. Background Technology

[0002] In the field of solid waste-based phase change materials (PCMs) preparation and application, combining PCMs with building materials can enhance the heat storage capacity of building envelopes, effectively regulate indoor temperature, and reduce energy consumption. However, this technology has not effectively solved the problems of thermal stability and thermal stress management of PCMs under high-temperature environments.

[0003] Similarly, the application of existing composite phase change materials in high-temperature thermal storage scenarios is limited, especially in the process of high-temperature thermal storage, where phase change materials are insufficient in terms of thermal stress control and thermal diffusion efficiency improvement.

[0004] Therefore, providing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, and its preparation method, to effectively manage thermal stress during high-temperature thermal storage, while improving thermal diffusion efficiency, and achieving efficient and stable operation of the high-temperature thermal storage structure has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, and a method for its preparation.

[0006] The first aspect of the embodiments of this disclosure provides a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, comprising: a core component internally filled with solid waste-based composite phase change material, an intelligent control component sleeved on the periphery of the core component, a variable stiffness flexible constraint component sleeved on the periphery of the intelligent control component, and a thermal barrier component sealed on the upper end of the core component. The intelligent control component adjusts itself and generates deformation to compensate for thermal stress based on the detected strain information of the core component.

[0007] Optionally, the solid waste-based composite phase change material includes fly ash and copper slag and is also at least doped with nitrates and metal compounds; The outer wall of the core assembly has a plurality of circular holes perpendicular to the axis of the core assembly, and the circular holes are filled with a highly thermally conductive material.

[0008] Optionally, the variable stiffness flexible constraint component includes an inner support mesh fitted around the periphery of the intelligent control component, a biomimetic porous structure fitted around the periphery of the inner support mesh, and an outer constraint ring fitted around the periphery of the biomimetic porous structure.

[0009] Optionally, the inner support mesh is made of elastic metal, the biomimetic porous structure is designed to mimic skeletal muscle tissue, and the outer constraint ring is made of shape memory alloy.

[0010] Optionally, the intelligent control component includes a shape memory alloy constraint ring and a stress feedback control system connected to the shape memory alloy constraint ring, the stress feedback control system being configured to adjust the shrinkage of the shape memory alloy constraint ring based on the measured strain information of the core component.

[0011] Optionally, the stress feedback control system includes a fiber Bragg grating sensor for detecting the deformation of the core assembly, a controller connected to the fiber Bragg grating sensor, and an induction heater connected to the controller and the shape memory alloy constraint ring, respectively. The controller controls the induction heater to heat the shape memory alloy constraint ring based on the strain information measured by the fiber optic grating sensor, so that the shape memory alloy constraint ring undergoes deformation to compensate for thermal stress.

[0012] Optionally, it also includes a self-sealing cap, which is placed at the lower end of the core assembly.

[0013] A second aspect of the embodiments of this disclosure provides a method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation. The method is used to prepare the aforementioned high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, characterized in that it includes: S1. Fly ash and copper slag are mixed in proportion, nitrates and metal compound additives are added, the mixture is stirred, granulated and dried to obtain solid waste-based composite phase change material. S2. Fill the solid waste-based composite phase change material into a mold, perform high-temperature vacuum sintering, and demold after cooling in the furnace to obtain the core assembly. S3. After placing the core component inside the variable stiffness flexible constraint component and installing the thermal barrier component, perform high-temperature sintering treatment again to prepare a high-temperature thermal storage structure.

[0014] Optionally, in step S1, the mass ratio of fly ash to copper slag is 1:1, the nitrate is NaNO, and its addition amount is 10% of the total weight, and the metal compound includes a mixture of MnO and MgO in a mass ratio of 1:1, and its addition amount is 5% of the total weight.

[0015] Optionally, in steps S2 and S3, the high-temperature vacuum sintering process is as follows: heating to 1150°C at a rate of 2°C / min, holding at that temperature for 2 hours, and then cooling with the furnace.

[0016] The beneficial effects of the embodiments of this disclosure include: Using solid waste-based high-energy-storage phase change materials as the core material for core components to store heat can effectively reduce urban solid waste emissions and environmental pollution, which is beneficial to environmental protection.

[0017] The variable stiffness flexible constraint component combines smart material shape memory alloy with a biomimetic porous structure to form a self-learning deformation behavior, thereby improving the mechanical performance of the structure.

[0018] The intelligent control component uses a combination of induction heater and fiber optic grating sensor to construct a dynamic thermal stress compensation system. By changing the temperature field distribution characteristics, it improves the thermal stress distribution state, significantly reduces the thermal stress level, and prevents the structure from overheating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, according to an embodiment of this disclosure. Figure 2 This is a schematic diagram of the structure of a variable stiffness flexible constraint component according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of a stress feedback control system according to an embodiment of the present disclosure; Figure 4 This is a schematic flowchart illustrating a method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, according to another embodiment of this disclosure.

[0020] In the diagram, 1. Core component; 2. Intelligent control component; 3. Variable stiffness flexible constraint component; 4. Thermal barrier component; 5. Circular hole; 6. Self-sealing cover; 21. Fiber optic grating sensor; 22. Controller; 23. Induction heater; 31. Inner support mesh; 32. Bionic porous structure; 33. Outer constraint ring. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0024] like Figure 1-3 As shown, a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation includes: a core component 1 internally filled with solid waste-based composite phase change material; an intelligent control component 2 sleeved around the core component 1; a variable stiffness flexible constraint component 3 sleeved around the intelligent control component 2; and a thermal barrier component 4 sealed on the upper end of the core component 1. The intelligent control component 2 self-adjusts and generates deformation to compensate for thermal stress based on the detected strain information of the core component 1.

[0025] In this application, solid waste-based high-energy-storage phase change materials are used as the core material to store heat, which can effectively reduce urban solid waste emissions, reduce environmental pollution, and is beneficial to environmental protection.

[0026] In some embodiments, the solid waste-based composite phase change material comprises fly ash and copper slag, and is further doped with at least nitrates and metal compounds. Specifically, the solid waste-based composite phase change material is made of fly ash, copper slag, NaNO3, and metal compounds.

[0027] The outer wall of the core assembly 1 is provided with a plurality of circular holes 5 perpendicular to the axial direction of the core assembly 1, and the circular holes 5 are filled with a highly thermally conductive material.

[0028] Specifically, the diameter of the circular hole 5 is set to 5mm, and the hole depth is set to 10mm.

[0029] In some embodiments, the variable stiffness flexible constraint component 3 includes an inner support mesh 31 sleeved on the outer periphery of the intelligent control component 2, a biomimetic porous structure 32 sleeved on the outer periphery of the inner support mesh 31, and an outer constraint ring 33 sleeved on the outer periphery of the biomimetic porous structure 32.

[0030] In some embodiments, the inner support mesh 31 is made of an elastic metal, the biomimetic porous structure 32 is designed to mimic skeletal muscle tissue, and the outer constraint ring 33 is made of a shape memory alloy.

[0031] Specifically, the inner support mesh 31 is made of 316L stainless steel, the biomimetic porous structure 32 is made of high-temperature silicone rubber, and the outer constraint ring 33 is made of Ga-In-Sn alloy.

[0032] In this application, the inner metal support mesh 31 provides basic support and thermal expansion space, the biomimetic porous structure 32 simulates the orderly concave-convex structure of skeletal muscle tissue to reduce stress concentration effect, and the outer constraint ring 33 is made of shape memory alloy, which actively adjusts the constraint force when the temperature changes.

[0033] In some embodiments, the radial dimension of the outer constraint ring 33 is larger than that of the biomimetic porous structure 32, and the radial dimension of the biomimetic porous structure 32 is larger than that of the inner support mesh 31.

[0034] In some embodiments, the intelligent control component 2 includes a shape memory alloy constraint ring and a stress feedback control system connected to the shape memory alloy constraint ring, the stress feedback control system being configured to adjust the shrinkage of the shape memory alloy constraint ring based on measured strain information of the core component 1.

[0035] In some embodiments, the stress feedback control system includes a fiber Bragg grating sensor 21 for detecting deformation of the core assembly 1, a controller 22 connected to the fiber Bragg grating sensor 21, and an induction heater 23 connected to the controller 22 and the shape memory alloy constraint ring, respectively.

[0036] The controller 22 controls the induction heater to heat the shape memory alloy constraint ring based on the strain information measured by the fiber optic grating sensor 21, so that the shape memory alloy constraint ring produces deformation to compensate for thermal stress.

[0037] The working principle of dynamic stress compensation includes: The fiber optic grating sensor 21 monitors thermal stress in real time. When the stress reaches a preset threshold (150µe), it sends a signal to the controller 22. The controller 22 analyzes the stress distribution and calculates a compensation scheme, triggering the induction heater (1kHz AC power, skin effect to achieve local heating), and the shape memory alloy constraint ring shrinks due to heat to provide accurate stress compensation.

[0038] In some embodiments, the high-temperature thermal storage structure further includes a self-sealing cover 6 disposed at the lower end of the core structure, the self-sealing cover 42 being made of high-temperature ceramic. The thermal barrier component 4 is configured to be made of alumina fiber felt and a ceramic cover plate.

[0039] The beneficial effects of the embodiments of this disclosure include: Using solid waste-based high-energy-storage phase change materials as the core material for core components to store heat can effectively reduce urban solid waste emissions and environmental pollution, which is beneficial to environmental protection.

[0040] The variable stiffness flexible constraint component combines smart material shape memory alloy with a biomimetic porous structure to form a self-learning deformation behavior, thereby improving the mechanical performance of the structure.

[0041] The intelligent control component uses a combination of induction heater and fiber optic grating sensor to construct a dynamic thermal stress compensation system. By changing the temperature field distribution characteristics, it improves the thermal stress distribution state, significantly reduces the thermal stress level, and prevents the structure from overheating.

[0042] Specifically, to overcome the problems existing in the prior art, the present invention provides a high-temperature thermal storage structure, characterized in that it includes: a core component 1 with a core made of solid waste-based high-energy-storage phase change material, a central intelligent control component 2 equipped with a stress feedback control system, and an external variable stiffness flexible constraint component 3 configured as an induction heating-stress feedback protective layer. The variable stiffness flexible constraint component 3 is configured to provide variable stiffness support for the core component 1, and the intelligent control component 2 is configured to perform dynamic stress compensation for the core component 1.

[0043] Specifically, the variable stiffness flexible constraint component 3 includes an inner support mesh 31, a biomimetic porous structure 32, and an outer constraint ring 33. The inner support mesh 31 is an elastic metal mesh, the biomimetic porous structure 32 simulates the structure of skeletal muscle tissue in nature, and the orderly arranged concave and convex structure can reduce the stress concentration effect. The outer constraint ring 33 is made of shape memory alloy.

[0044] Furthermore, the dynamic stress compensation part of the intelligent control component 2 is composed of an induction heater and a fiber optic grating. The fiber optic grating monitors the thermal stress in real time and feeds back the stress information to the controller 22. When the stress reaches the threshold, it triggers the shape memory alloy to shrink in order to eliminate the thermal stress.

[0045] The invention provides a high-temperature heat storage structure, characterized in that the controller 22 consists of two parts: a power controller and a temperature controller. The power controller controls the heat generation by adjusting the induced current based on the stress information provided by the fiber optic grating to prevent overheating, while the temperature controller adjusts the target temperature based on the temperature information provided by the infrared thermometer.

[0046] The invention provides a high-temperature thermal storage structure, characterized in that the top floating self-sealing cover of the structure is composed of a graphene-reinforced ceramic floating cover and a flexible graphite gasket, which isolates oxygen and reduces oxidation damage to the material.

[0047] The beneficial effects of this invention are: by using solid waste-based high-energy-storage phase change materials as the core material to store heat, it can effectively reduce urban solid waste emissions, reduce environmental pollution, and is beneficial to environmental protection.

[0048] By combining smart material shape memory alloy with biomimetic porous structure 32, a self-learning deformation behavior is formed, which improves the mechanical properties of the structure.

[0049] A dynamic thermal stress compensation system is constructed by using an induction heater and fiber optic grating sensor in a coordinated control manner. By changing the temperature field distribution characteristics, the thermal stress distribution state is improved, the thermal stress level is significantly reduced, and the overheating of the structure is prevented.

[0050] A specific example includes: Figure 1 As shown, the present invention comprises four parts: a core component 1, a variable stiffness flexible constraint component 3, an intelligent control component 2, and a thermal barrier component 4.

[0051] The core assembly 1 is a cylindrical cavity with a set of axially uniformly distributed circular holes 5 on its exterior. The core assembly 1 is filled with a target phase change material, which is a multiphase system, using fly ash or copper slag as the main phase change material, and doped with NaNO3 and metal compounds to form a solid waste-based composite phase change material. The variable stiffness flexible constraint assembly 3 is sleeved on the outside of the core assembly 1, and includes multiple layers of elastic supports with different stiffnesses. The intelligent control assembly 2 is located between the variable stiffness flexible constraint assembly 3 and the core assembly 1, and includes a shape memory alloy constraint ring and a stress feedback control system. The thermal barrier assembly 4 is located at the upper end of the core assembly 1.

[0052] refer to Figure 2The circular holes 5 have a diameter of 5mm, a depth of 10mm, and a total of 6 holes, with the interior filled with thermally conductive sand. The variable stiffness flexible constraint component 3 comprises three elastic supports, from bottom to top: a rigid support (inner support mesh 31), a highly elastic rubber support (bionic porous structure 32), and a highly fluid molten metal support (outer constraint ring 33), thus making the stiffness of the entire variable stiffness flexible constraint component 3 change in a stepped manner. The stress feedback control system comprises a fiber optic grating sensor 21, an induction heater 23, and a controller 22. It controls the current magnitude by measuring the strain information of the core component 1 to adjust the shrinkage of the shape memory alloy constraint ring, thereby compensating for the stress in the core component 1. The self-sealing cover 6 is made of high-temperature ceramic, and the thermal barrier component 4 is made of alumina fiber felt, both capable of withstanding high temperatures of 1000°C.

[0053] refer to Figure 4 A second aspect of the embodiments of this disclosure provides a method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation. The method is used to prepare the aforementioned high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, characterized in that it includes: S1. Fly ash and copper slag are mixed in a certain proportion, nitrates and metal compound additives are added, and the mixture is stirred, granulated and dried to obtain solid waste-based composite phase change material.

[0054] S2. The solid waste-based composite phase change material is filled into the mold and sintered under high temperature and vacuum. After cooling in the furnace, it is demolded to obtain the core component 1.

[0055] S3. After placing the core component 1 inside the variable stiffness flexible constraint component 3 and installing the thermal barrier component 4, perform high-temperature sintering treatment again to prepare a high-temperature thermal storage structure.

[0056] In some embodiments, in step S1, the mass ratio of fly ash to copper slag is 1:1, the nitrate is selected as NaNO3, and its addition amount is 10% of the total weight, and the metal compound includes a mixture of MnO and MgO in a mass ratio of 1:1, and its addition amount is 5% of the total weight.

[0057] In some embodiments, in steps S2 and S3, the high-temperature vacuum sintering process is as follows: the temperature is increased to 1150°C at a rate of 2°C / min, held at that temperature for 2 hours, and then cooled with the furnace.

[0058] A specific example includes: a method for fabricating a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, the specific steps of which are as follows: S1. Fly ash and copper slag are mixed at a mass ratio of 1:1. 10% NaNO and 5% metal compound are added by weight. The metal compound is a mixture of MnO and MgO at a mass ratio of 1:1. After thorough stirring, the mixture is granulated to obtain spherical particles with a particle size of 10~50mm. Then, the particles are dried in an oven for 12 hours to obtain solid waste-based composite phase change material.

[0059] S2. Place the round hole 5 mold with particles on the inner wall into a high-temperature vacuum sintering furnace, heat it to 1150°C at a rate of 2°C / min, hold it at that temperature for 2 hours, and then demold it after cooling to room temperature in the furnace to obtain the required core component. S3. Place the core assembly in the axially evenly distributed circular holes 5 between the rigid support and the high elastic support, cover it with the top cover and place it in a vacuum sintering furnace. Heat it to 1150°C at a rate of 2°C / min, hold it at that temperature for 2 hours, and then demold it after cooling to room temperature in the furnace to obtain the desired heat storage structure.

[0060] S4. The generated heat storage structure is installed on the heat barrier component 4 with alumina fiber felt underneath, and together they are placed in the induction heating device for temperature measurement and stress monitoring. At the same time, a separate induction heating device is arranged on the other side for heat generation test.

[0061] The present invention will be further described below with reference to the embodiments.

[0062] Example 1: This example relates to a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, and its preparation method. Materials used: fly ash and copper slag composite NaNO, fiber optic grating sensor 21, 316L stainless steel pipe, copper slag powder, alumina fiber felt, and mixed MnO and MgO powder. Equipment used: high-temperature vacuum sintering furnace, machining center, electro-hydraulic servo press, magnetic levitation central air conditioning unit, etc. Preparation process: First, fly ash and copper slag are ground into powder and mixed in a 1:1 ratio to obtain mixed powder A. Next, NaNO and CuO are mixed in a 5%:95% mass ratio to obtain mixed powder B. Finally, mixed powder A and mixed powder B are mixed to obtain mixed powder C.

[0063] Mixed powder C is granulated uniformly with water and dried, then placed in a high-temperature vacuum sintering furnace for high-temperature sintering to obtain the required core.

[0064] Subsequently, a variable stiffness flexible support component 3 with core components laid on the inner wall was machined using a machining center and installed on an electro-hydraulic servo press. It was then loaded to the target strain value (50% of the target strain was selected based on experience. According to the test, the target strain value is about 150 με in this embodiment), and then constant temperature stress relief treatment was performed.

[0065] Next, heat-barrier components 4 and self-sealing covers 6 are installed on the upper and lower ends of the variable stiffness flexible support component 3, and the magnetic levitation central air conditioning unit is used for cooling until the temperature reaches the initial value.

[0066] Finally, the variable stiffness flexible support component 3 and the thermal barrier component 4 were installed together in the induction heating device for subsequent experiments.

[0067] In this example, AC excitation with a frequency of 1kHz is used for heating. Due to the skin effect of AC, precise and controllable local heating can be achieved.

[0068] Example 2: This example relates to a high-temperature thermal storage structure and its preparation method based on solid waste-based variable stiffness support and dynamic stress compensation.

[0069] Materials selected: fly ash and copper slag composite NaNO, fiber optic grating sensor 21, 316L stainless steel tube, copper slag powder, alumina fiber felt, zirconium tungsten oxyzirconium silicon carbide whiskers (ZrWOC).

[0070] Equipment selected: high-temperature vacuum sintering furnace, machining center, electro-hydraulic servo press, magnetic levitation central air conditioning unit, etc.

[0071] Preparation process: First, fly ash and copper slag are ground into powder and mixed in a 1:1 ratio to obtain mixed powder A. Next, NaNO and ZrWOC are mixed in a mass ratio of 5%:95% to obtain mixed powder B. Finally, mixed powder A and mixed powder B are mixed to obtain mixed powder C.

[0072] Mixed powder C is granulated uniformly with water and dried, then placed in a high-temperature vacuum sintering furnace for high-temperature sintering to obtain the required core.

[0073] Subsequently, a variable stiffness flexible support component 3 with core components laid on the inner wall was machined using a machining center and installed on an electro-hydraulic servo press. It was then loaded to the target strain value (50% of the target strain was selected based on experience. According to the test, the target strain value is about 180 με in this embodiment), and then constant temperature stress relief treatment was performed.

[0074] Next, thermal barrier components 4 and self-sealing covers 6 were installed at the upper and lower ends of the variable stiffness flexible support component 3, and a magnetic levitation central air conditioning unit was used for cooling until the temperature reached the initial value. Finally, the variable stiffness flexible support component 3 and the thermal barrier component 4 were installed together in an induction heating device for subsequent experiments.

[0075] In this example, AC excitation with a frequency of 1kHz is used for heating. Due to the skin effect of AC, precise and controllable local heating can be achieved.

[0076] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, characterized in that, include: The core assembly is filled with solid waste-based composite phase change material, the intelligent control assembly is sleeved on the outer periphery of the core assembly, the variable stiffness flexible constraint assembly is sleeved on the outer periphery of the intelligent control assembly, and the thermal barrier assembly is sealed on the upper end of the core assembly. The intelligent control component adjusts itself and generates deformation to compensate for thermal stress based on the detected strain information of the core component.

2. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 1, characterized in that, The solid waste-based composite phase change material includes fly ash and copper slag, and is also doped with at least nitrates and metal compounds. The outer wall of the core assembly has a plurality of circular holes perpendicular to the axis of the core assembly, and the circular holes are filled with a highly thermally conductive material.

3. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 1, characterized in that, The variable stiffness flexible constraint component includes an inner support mesh fitted around the outer periphery of the intelligent control component, a biomimetic porous structure fitted around the outer periphery of the inner support mesh, and an outer constraint ring fitted around the outer periphery of the biomimetic porous structure.

4. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 3, characterized in that, The inner support mesh is made of elastic metal, the biomimetic porous structure is designed to mimic skeletal muscle tissue, and the outer constraint ring is made of shape memory alloy.

5. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 1, characterized in that, The intelligent control component includes a shape memory alloy constraint ring and a stress feedback control system connected to the shape memory alloy constraint ring. The stress feedback control system is configured to adjust the shrinkage of the shape memory alloy constraint ring based on the measured strain information of the core component.

6. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 5, characterized in that, The stress feedback control system includes a fiber optic grating sensor for detecting the deformation of the core assembly, a controller connected to the fiber optic grating sensor, and an induction heater connected to the controller and the shape memory alloy constraint ring, respectively. The controller controls the induction heater to heat the shape memory alloy constraint ring based on the strain information measured by the fiber optic grating sensor, so that the shape memory alloy constraint ring undergoes deformation to compensate for thermal stress.

7. The high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 1, characterized in that, Also includes: A self-sealing cap is placed at the lower end of the core assembly.

8. A method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation, the method being used to prepare the high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation as described in any one of claims 1-7, characterized in that, include: S1. Fly ash and copper slag are mixed in proportion, nitrates and metal compound additives are added, the mixture is stirred, granulated and dried to obtain solid waste-based composite phase change material. S2. Fill the solid waste-based composite phase change material into a mold, perform high-temperature vacuum sintering, and demold after cooling in the furnace to obtain the core assembly. S3. After placing the core component inside the variable stiffness flexible constraint component and installing the thermal barrier component, perform high-temperature sintering treatment again to prepare a high-temperature thermal storage structure.

9. The method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 8, characterized in that, In step S1, the mass ratio of fly ash to copper slag is 1:1, the nitrate is NaNO, and its addition amount is 10% of the total weight, and the metal compound includes a mixture of MnO and MgO in a mass ratio of 1:1, and its addition amount is 5% of the total weight.

10. The method for preparing a high-temperature thermal storage structure based on solid waste-based variable stiffness support and dynamic stress compensation according to claim 8, characterized in that, In steps S2 and S3, the high-temperature vacuum sintering process is as follows: the temperature is increased to 1150°C at a rate of 2°C / min, held at that temperature for 2 hours, and then cooled with the furnace.

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