Heat storage body based on asymmetrical dissipation structure and electromagnetic field cooperation and preparation method

Abstract

The invention provides a heat storage body based on asymmetrical dissipation structure and electromagnetic field cooperation and a preparation method, the heat storage body comprises a spiral framework, a stress buffer layer and an energy storage core layer, the spiral framework is provided with an asymmetrical hyperboloid structure, the curvature of the inner wall of the asymmetrical hyperboloid structure is different from that of the outer portion of the asymmetrical hyperboloid structure, and the spiral framework is prepared from steel slag; the stress buffer layer is made of a negative thermal expansion ceramic material and covers the outer wall of the spiral framework, and the energy storage core layer is made of a solid waste-based composite phase change material and is filled in the spiral framework. Through the arrangement of the spiral framework, the radiation heat dissipation effect can be enhanced, the temperature gradient is reduced, internal stress and thermal stress are effectively inhibited, and the service life is prolonged; through the arrangement of the stress buffer layer, the energy storage core layer can be prevented from being greatly shrunk, and the destructive effect of thermal stress on the heat storage body is further relieved; by means of the arrangement of the energy storage core layer, the uniformity of an internal thermal field can be actively adjusted, and crack growth and collapse caused by uneven thermal stress are effectively restrained.

Description

Technical Field

[0001] The embodiments of the present invention belong to the field of high-temperature thermal storage technology, specifically relating to a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field, and its preparation method. Background Technology

[0002] In the field of development and application of solid waste-based high-temperature thermal energy storage, existing technologies, such as those shown in patents CN119980356A and CN120289149A, have achieved certain results in suppressing thermal stress and improving material performance, but these technologies still have limitations in controlling thermal stress and efficiently storing energy under high-temperature conditions.

[0003] Reference patent CN119980356A effectively improves the service life of electrolytic cells through gradient structure design and composite material application. However, it does not involve the active control of thermal stress in solid waste-based high-temperature thermal storage bodies, and there are still deficiencies in the compensation mechanism for the thermal expansion coefficient of materials at high temperatures.

[0004] Although the reference patent CN120289149A proposed an innovative solution for multi-scale toughening of concrete, its technical principle is fundamentally different from the thermal stress control and energy storage mechanism of high-temperature thermal storage bodies, and it failed to provide a solution for solid waste-based high-temperature thermal storage bodies. Summary of the Invention

[0005] The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide a thermal storage body and its preparation method based on the synergy of asymmetric dissipative structure and electromagnetic field.

[0006] One embodiment of the present invention provides a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field, comprising: A spiral skeleton having an asymmetric hyperboloid structure, wherein the curvature of the inner wall and the curvature of the outer wall of the asymmetric hyperboloid structure are different, and the spiral skeleton is made of steel slag; A stress buffer layer, which covers the outer wall of the helical skeleton, is made of a negative thermal expansion ceramic material; An energy storage core layer is filled inside the spiral skeleton and is composed of a solid waste-based composite phase change material.

[0007] In some embodiments of the present invention, the pitch of the helical skeleton gradually increases axially from bottom to top.

[0008] In some embodiments of the present invention, the pitch of the helical skeleton increases from 5 mm at its bottom to 20 mm at its top.

[0009] In some embodiments of the present invention, the wall thickness of the helical skeleton satisfies the formula: d = k * (α + β) / lnβ; Where k is a constant, α is the helix angle, and β is the hyperbolic angle of the surface.

[0010] In some embodiments of the present invention, the stress buffer layer comprises at least one negative thermal expansion material selected from ZrWO, HfMo2O8 or ZrV2O7, and steel slag powder is added as a matrix.

[0011] In some embodiments of the present invention, the stress buffer layer comprises ZrWO and steel slag, wherein the volume fraction of ZrWO is 15%.

[0012] In some embodiments of the present invention, the ZrWO is arranged in the form of nanoribbons, with the arrangement direction opposite to the helical rotation direction.

[0013] In some embodiments of the present invention, the energy storage core layer is composed of a solid waste-based composite phase change material, with the components having a molar ratio of slag: steel slag: coke: metallic iron = 2:1:1:2.

[0014] In some embodiments of the present invention, the phase change temperature of the solid waste-based composite phase change material is selected as 800°C, and the latent heat of phase change is selected as 200J / g.

[0015] A second aspect of the present invention provides a method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field as described in any of the above embodiments, comprising the steps of: S1. 3D Printed Spiral Skeleton: Printing an asymmetric hyperboloid structure from raw materials containing steel slag; S2. Preparation of stress buffer layer: The outer wall of the spiral skeleton is coated with a slurry containing ZrWO nanoribbons, a reverse magnetic field of 0.5T is applied, and the mixture is sintered at 900℃ and cooled to obtain the stress buffer layer; S3. Preparation of the energy storage core layer: Molten solid waste-based composite phase change material is injected into the interior of the spiral skeleton and subjected to vibration treatment to obtain a solid waste-based high-temperature thermal energy storage body; S4. Alternating electromagnetic field treatment: The high-temperature thermal storage body based on solid waste is placed in an alternating electromagnetic field for thermal stress suppression treatment.

[0016] The beneficial effects of this invention are: 1. The steel slag micro powder 3D printed spiral skeleton in this invention has a multi-scale asymmetric dissipation structure, which can significantly enhance the radiative heat dissipation effect, reduce the temperature gradient, and effectively suppress internal stress and thermal stress. 2. The stress buffer layer formed by the ZrWO nanoribbons in this invention is located on the outer wall of the helical skeleton, which can avoid the core layer from shrinking significantly due to the recovery of latent heat of phase change, thereby further mitigating the destructive effect of thermal stress on the heat storage body. 3. The hollow closed space formed by storing heat during the phase change of the solid waste-based composite phase change material in this invention can actively regulate the uniformity of the internal thermal field, effectively suppressing crack growth and collapse caused by uneven thermal stress. 4. The asymmetric gradient structure in this invention, after being treated with an electromagnetic field, can effectively suppress thermal stress damage and significantly improve the service life of the high-temperature thermal storage body. Attached Figure Description

[0017] Figure 1 This is a logic flowchart of the method for preparing a thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit disclosure. The described embodiments are some, but not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0019] One embodiment of the present invention provides a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field, comprising: a helical skeleton, a stress buffer layer, and an energy storage core layer. The helical skeleton has an asymmetric hyperboloid structure, wherein the curvature of the inner wall of the asymmetric hyperboloid structure is different from that of the outer wall. The stress buffer layer covers the outer wall of the helical skeleton, and the energy storage core layer fills the interior of the helical skeleton. The helical skeleton is made of steel slag, the stress buffer layer is made of a negative thermal expansion ceramic material, and the energy storage core layer is made of a solid waste-based composite phase change material.

[0020] The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field in this disclosure has a multi-scale asymmetric dissipative structure in the spiral skeleton 3D printed with steel slag powder, which can significantly enhance the radiative heat dissipation effect, reduce the temperature gradient, and effectively suppress internal stress and thermal stress. By setting a ZrWO nanoribbon stress buffer layer on the outer wall of the spiral skeleton, the core layer can be prevented from shrinking significantly due to the recovery of latent heat of phase change, thereby further mitigating the destructive effect of thermal stress on the thermal storage body. The hollow closed space formed by the heat stored during the phase change of the solid waste-based composite phase change material in the energy storage core layer can actively regulate the uniformity of the internal thermal field, effectively suppressing crack growth and collapse caused by uneven thermal stress.

[0021] In some embodiments of the present invention, the pitch of the helical skeleton gradually increases axially from bottom to top.

[0022] In some embodiments of the present invention, the pitch of the helical skeleton increases from 5 mm at its bottom to 20 mm at its top.

[0023] In some embodiments of the present invention, the wall thickness of the helical skeleton satisfies the formula: d = k * (α + β) / lnβ; Where k is a constant, α is the helix angle, and β is the hyperbolic angle of the surface.

[0024] In some embodiments of the present invention, the stress buffer layer comprises at least one negative thermal expansion material selected from ZrWO, HfMo2O8 or ZrV2O7, and steel slag powder is added as a matrix.

[0025] In some embodiments of the present invention, the stress buffer layer comprises ZrWO and steel slag, wherein the volume fraction of ZrWO is 15%.

[0026] In some embodiments of the present invention, the ZrWO is arranged in the form of nanoribbons, with the arrangement direction opposite to the helical rotation direction.

[0027] In some embodiments of the present invention, the energy storage core layer is composed of a solid waste-based composite phase change material, with the components having a molar ratio of slag: steel slag: coke: metallic iron = 2:1:1:2.

[0028] In some embodiments of the present invention, the phase change temperature of the solid waste-based composite phase change material is selected as 800°C, and the latent heat of phase change is selected as 200J / g.

[0029] A second aspect of the present invention provides a method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field as described in any of the above embodiments, comprising the steps of: S1. 3D Printed Spiral Skeleton: Printing an asymmetric hyperboloid structure from raw materials containing steel slag; S2. Preparation of stress buffer layer: The outer wall of the spiral skeleton is coated with a slurry containing ZrWO nanoribbons, a reverse magnetic field of 0.5T is applied, and the mixture is sintered at 900℃ and cooled to obtain the stress buffer layer; S3. Preparation of the energy storage core layer: Molten solid waste-based composite phase change material is injected into the interior of the spiral skeleton and subjected to vibration treatment to obtain a solid waste-based high-temperature thermal energy storage body; S4. Alternating electromagnetic field treatment: The high-temperature thermal storage body based on solid waste is placed in an alternating electromagnetic field for thermal stress suppression treatment.

[0030] This disclosure discloses a method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field. The spiral skeleton, 3D printed from steel slag powder, possesses a multi-scale asymmetric dissipative structure, which significantly enhances radiative heat dissipation, reduces temperature gradients, and effectively suppresses internal and thermal stresses. By incorporating a ZrWO nanoribbon stress buffer layer on the outer wall of the spiral skeleton, significant shrinkage of the core layer due to latent heat recovery during phase change is avoided, further mitigating the destructive effects of thermal stress on the thermal storage body. The hollow closed space formed by the stored heat during the phase change of the solid waste-based composite phase change material in the energy storage core layer actively regulates the uniformity of the internal thermal field, effectively suppressing crack growth and collapse caused by uneven thermal stress. Treatment of the asymmetric gradient structure spiral skeleton with an electromagnetic field effectively suppresses thermal stress damage, significantly improving the service life of the high-temperature thermal storage body.

[0031] The method for preparing thermal storage bodies based on the synergy of asymmetric dissipative structures and electromagnetic fields includes the following specific steps: S1. Add ZrWO nanoribbons to steel slag powder and use a 3D printer to print a spiral skeleton with an asymmetric hyperboloid structure from the mixed steel slag. S2. Coat the outer wall of the spiral skeleton with a slurry containing ZrWO nanobelts, place the spiral skeleton with ZrWO nanobelts arranged in an orientation in a mold, apply a magnetic field of 0.5T to the outside, heat to 900°C at a heating rate of 10°C / min, then remove the external magnetic field and allow it to cool naturally to room temperature to obtain a stress buffer layer. S3. Molten solid waste-based composite phase change material is injected into the spiral skeleton and placed on a vibration platform for uniform vibration for 30 minutes to obtain a solid waste-based high-temperature heat storage body. S4. The solid waste-based composite phase change material heat storage body obtained in S3 is placed in an alternating electromagnetic field for thermal stress suppression treatment.

[0032] Furthermore, in S3, the vibration platform frequency is set to 35Hz.

[0033] Furthermore, in S4, the alternating electromagnetic field strength is set to 0.25 A / m, and the frequency is set to 10 kHz.

[0034] Example 1: A method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field includes: (1) Main raw materials: The material of the spiral skeleton used in this invention is steel slag, and typical steel slag powder with a mesh size of 100 is selected; the material of the energy storage core layer used in this invention is a polyol-based solid phase change material; the external field control components used in this invention include a ring electromagnetic coil and a matching power supply.

[0035] (2) The preparation steps include: S1, 3D printed spiral skeleton The shape and structure of a high-temperature thermal energy storage body based on steel slag were designed using 3D modeling software. A novel asymmetric dissipative structure spiral skeleton was designed. The spiral skeleton with an asymmetric hyperboloid was printed using 3D printing technology with steel slag raw material containing ZrWO nanoribbons. S2, Preparation of the energy storage core layer First, the phase change material and paraffin (solid waste-based composite phase change material) are mixed by melting and heat storage and then poured into a mold. After dehydration and drying, the mixture is placed in an atmosphere furnace for a programmed temperature rise test. When the programmed temperature rises to 700°C, the phase change material solidifies into a single-phase structure. Heating is then stopped, and the phase change medium is obtained. After cooling to room temperature, the outside of the spiral skeleton is covered with tin foil and placed in a vacuum oven. The phase change medium is injected into the skeleton voids by vacuum-pressure oscillation method to form an energy storage core layer inside the spiral skeleton. S3, Stress buffer layer construction: ZrWO nanoribbons with negative thermal expansion properties were mixed with alumina binder to form a slurry. The slurry was then evenly coated onto the outside of the skeleton and placed in a mold. A reverse magnetic field of 0.5T was applied, and the temperature was increased to 900℃ at 10℃ / min for 2 hours. The magnetic field was then removed and the mixture was cooled to form a high-temperature negative CTE ceramic stress buffer layer.

[0036] S4. Installation of external control components: The planned silver-plated copper wire is processed into a ring-shaped electromagnetic coil according to the design dimensions, and insulating tape is wrapped around the outside. An insulating coating is applied to the key parts, and then the coil is wound around the heat storage body.

[0037] Example 2: A method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field includes: (1) Main raw materials: The spiral skeleton used in this invention is made of steel slag, and basalt fiber reinforced magnesium cement-based composite material is selected; the energy storage core layer used in this invention is made of polyol solid phase change material; the external field control components used in this invention include a ring electromagnetic coil and a matching power supply.

[0038] (2) The main manufacturing steps are as follows: S1, 3D printed spiral skeleton The shape and structure of a high-temperature thermal energy storage body based on steel slag were designed using 3D modeling software, and a novel asymmetric dissipative structure spiral skeleton was designed. The spiral skeleton with an asymmetric hyperboloid was printed using 3D printing technology. S2, Preparation of the energy storage core layer First, the phase change material and paraffin (solid waste-based composite phase change material) are mixed by melting and heat storage and then poured into a mold. After dehydration and drying, the mixture is placed in an atmosphere furnace for a programmed temperature rise test. When the programmed temperature rises to 700°C, the phase change material solidifies into a single-phase structure. Heating is then stopped, and the phase change medium is obtained. After natural cooling, the outside is wrapped with tin foil and placed in a vacuum oven. The phase change medium is injected into the skeleton voids by vacuum-pressure oscillation method to form an energy storage core layer inside the spiral skeleton. S3, Construction of outer edge stress buffer layer: ZrWO nanoribbons with negative thermal expansion properties were mixed with alumina binder to form a slurry. The slurry was then evenly coated onto the outside of the skeleton and placed in a mold. A reverse magnetic field of 0.5T was applied, and the temperature was increased to 900℃ at 10℃ / min for 2 hours. The magnetic field was then removed and the mixture was cooled to form a high-temperature negative CTE ceramic stress buffer layer. S4. Installation of external control components: The planned silver-plated copper wire is processed into a ring electromagnetic coil according to the design dimensions, and insulating tape is wrapped around the outside. An insulating coating is applied to the key parts, and then the coil is wound around the heat storage body.

[0039] The present invention relates to a thermal storage body and its preparation method based on asymmetric dissipative structure and electromagnetic field synergy. Through spiral fractal skeleton design and functional partition reconstruction, combined with an active control system for electromagnetic field thermal expansion compensation and a quaternary eutectic system for multiphase change point energy storage medium, the present invention achieves effective suppression of thermal stress and efficient energy storage of solid waste-based high-temperature thermal storage body under high-temperature conditions.

[0040] The technical solution of this invention not only innovatively solves the problem of thermal stress control under high temperature conditions, but also shows significant advantages in improving energy storage efficiency, providing a new technical path for the development and application of solid waste-based high temperature thermal energy storage bodies.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field, characterized in that, include: A spiral skeleton having an asymmetric hyperboloid structure, wherein the curvature of the inner wall and the curvature of the outer wall of the asymmetric hyperboloid structure are different, and the spiral skeleton is made of steel slag; A stress buffer layer, which covers the outer wall of the helical skeleton, is made of a negative thermal expansion ceramic material; An energy storage core layer is filled inside the spiral skeleton and is composed of a solid waste-based composite phase change material.

2. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field as described in claim 1, characterized in that, The pitch of the helical skeleton gradually increases axially from bottom to top.

3. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to claim 2, characterized in that, The pitch of the spiral skeleton increases from 5 mm at its bottom to 20 mm at its top.

4. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field as described in claim 1, characterized in that, The wall thickness of the spiral skeleton satisfies the formula: d = k * (α + β) / lnβ; Where k is a constant, α is the helix angle, and β is the hyperbolic angle of the surface.

5. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field as described in claim 1, characterized in that, The stress buffer layer contains at least one negative thermal expansion material selected from ZrWO, HfMo2O8 or ZrV2O7, and steel slag powder is added as a matrix.

6. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to claim 5, characterized in that, The stress buffer layer comprises ZrWO and steel slag, wherein the volume fraction of ZrWO is 15%.

7. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to claim 6, characterized in that, The ZrWO is arranged in a nanoribbon orientation, with the arrangement direction opposite to the helical rotation direction.

8. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to claim 1, characterized in that, The energy storage core layer is composed of solid waste-based composite phase change material, with the components in a molar ratio of slag: steel slag: coke: metallic iron = 2:1:1:

2.

9. The thermal storage body based on the synergy of asymmetric dissipative structure and electromagnetic field according to claim 8, characterized in that, The phase change temperature of the solid waste-based composite phase change material is selected as 800°C, and the latent heat of phase change is selected as 200J / g.

10. A method for preparing a thermal storage body based on the synergy of an asymmetric dissipative structure and an electromagnetic field as described in any one of claims 1-9, comprising the steps of: S1. 3D Printed Spiral Skeleton: Printing an asymmetric hyperboloid structure from raw materials containing steel slag; S2. Preparation of stress buffer layer: The outer wall of the spiral skeleton is coated with a slurry containing ZrWO nanoribbons, a reverse magnetic field of 0.5T is applied, and the mixture is sintered at 900℃ and cooled to obtain the stress buffer layer; S3. Preparation of the energy storage core layer: Molten solid waste-based composite phase change material is injected into the interior of the spiral skeleton and subjected to vibration treatment to obtain a solid waste-based high-temperature thermal energy storage body; S4. Alternating electromagnetic field treatment: The high-temperature thermal storage body based on solid waste is placed in an alternating electromagnetic field for thermal stress suppression treatment.

Images