Concrete-based phase change thermoelectric power generation device and preparation method

Abstract

The application discloses a concrete-based phase change thermoelectric power generation device and a preparation method thereof. The concrete-based phase change thermoelectric power generation device comprises a thermoelectric sheet and a concrete-based phase change energy storage layer. The thermoelectric sheet comprises a first copper-clad ceramic substrate, a second copper-clad ceramic substrate, P-type thermoelectric particles and N-type thermoelectric particles. The P-type thermoelectric particles and the N-type thermoelectric particles are arranged between the first copper-clad ceramic substrate and the second copper-clad ceramic substrate. The concrete-based phase change energy storage layer is arranged on opposite sides of the thickness direction of the thermoelectric sheet. The concrete-based phase change energy storage layer comprises a concrete base and a plurality of phase change energy storage microcapsules distributed in the concrete base. According to the concrete-based phase change thermoelectric power generation device, the phase change energy storage microcapsules in the concrete-based phase change energy storage layer can store heat, and the thermoelectric sheet can obtain electric energy by using the temperature difference between the concrete-based phase change energy storage layers arranged on opposite sides of the thickness direction of the thermoelectric sheet. Therefore, the waste of heat energy is reduced, and the utilization rate of heat energy is improved.

Description

Technical Field

[0001] This invention relates to the field of thermoelectric power generation technology, and in particular to a concrete-based phase change thermoelectric power generation device and its preparation method. Background Technology

[0002] As users' living standards improve, their demands for comfort also increase. For example, relying on central heating in cold winters leads to significant energy consumption. Since environmental heat energy exists, particularly during the daytime in cold winters, its utilization rate is low. Therefore, this needs to be addressed. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a concrete-based phase change thermoelectric power generation device. This device utilizes phase change energy storage microcapsules within a concrete-based phase change energy storage layer to store heat energy. For example, the phase change energy storage microcapsules can absorb heat from the environment for subsequent use. Furthermore, by providing concrete-based phase change energy storage layers on opposite sides of the thermoelectric element's thickness, the thermoelectric element can utilize the temperature difference between the two concrete-based phase change energy storage layers to obtain electrical energy to power electrical devices, reducing heat energy waste and improving heat energy utilization efficiency.

[0004] The present invention also proposes a method for preparing the above-mentioned concrete-based phase change thermoelectric power generation device.

[0005] According to a first aspect of the present invention, a concrete-based phase change thermoelectric power generation device includes: a thermoelectric element comprising a first copper-clad ceramic substrate, a second copper-clad ceramic substrate, P-type thermoelectric particles, N-type thermoelectric particles, a first wire, and a second wire, wherein the P-type thermoelectric particles and the N-type thermoelectric particles are disposed between the first copper-clad ceramic substrate and the second copper-clad ceramic substrate, the P-type thermoelectric particles are connected to the copper layer of the first copper-clad ceramic substrate, the N-type thermoelectric particles are connected to the copper layer of the second copper-clad ceramic substrate, the first wire is connected to the copper layer on the first copper-clad ceramic substrate, and the second wire is connected to the copper layer on the second copper-clad ceramic substrate; and a concrete-based phase change energy storage layer disposed on opposite sides of the thermoelectric element in the thickness direction, the concrete-based phase change energy storage layer comprising a concrete matrix and a plurality of phase change energy storage microcapsules distributed within the concrete matrix, each phase change energy storage microcapsule comprising a capsule shell and a phase change material disposed within the capsule shell.

[0006] According to an embodiment of the present invention, a concrete-based phase change thermoelectric power generation device is provided with phase change energy storage microcapsules in the concrete-based phase change energy storage layer, which can play the role of storing heat. For example, the phase change energy storage microcapsules can absorb heat from the environment so that heat energy can be used at any time. Furthermore, by providing concrete-based phase change energy storage layers on opposite sides in the thickness direction of the thermoelectric element, the thermoelectric element can obtain electrical energy by utilizing the temperature difference between the two concrete-based phase change energy storage layers to provide electrical energy to the electrical device, thereby reducing the waste of heat energy and improving the utilization rate of heat energy.

[0007] According to some embodiments of the present invention, the P-type thermoelectric particles comprise a geopolymer and a first semiconductor material, the first semiconductor material comprising bismuth antimonide and bismuth telluride; the N-type thermoelectric particles comprise a geopolymer and a second semiconductor material, the second semiconductor material comprising bismuth selenide and bismuth telluride; wherein the raw materials for preparing the geopolymer include river sand, cementing materials, and an alkali activator.

[0008] According to some embodiments of the present invention, in the raw materials for preparing the geopolymer, the mass ratio of river sand to the cementing material is 1:2-4; in the raw materials for preparing the geopolymer, the mass ratio of the total mass of the river sand and the cementing material to the mass of the alkali activator is 100:20-35; in the P-type thermoelectric particles, the mass ratio of the total mass of the river sand and the cementing material to the mass of the first semiconductor material is 100:20-40; in the N-type thermoelectric particles, the mass ratio of the total mass of the river sand and the cementing material to the mass of the second semiconductor material is 100:20-40.

[0009] According to some embodiments of the present invention, the cementing material comprises metakaolin, slag, fly ash, and silica fume; wherein the content of metakaolin is 60-90 wt%, the content of slag is 5-15 wt%, the content of fly ash is 5-10 wt%, and the content of silica fume is 5-10 wt%; the specific surface area of ​​the slag is 600-800 m². 2 / kg, residue on a 45μm square-hole sieve <1%, the total content of Al2O3 and SiO2 in the slag ≥50wt%; the fly ash is Grade I calcium ash, the CaO content in the Grade I calcium ash is not less than 10%; the particle size of the silica fume is 0.1-0.3μm, and the specific surface area of ​​the silica fume is 15000-30000. .

[0010] According to some embodiments of the present invention, the alkali activator is a mixed solution of a strong alkali solution and a water glass solution, and the mass ratio of the strong alkali solution to the water glass solution is 3:6-8.

[0011] According to some embodiments of the present invention, the concrete matrix comprises geopolymer concrete, and the raw materials for preparing the geopolymer concrete include river sand, cementitious materials, alkali activator, and polyvinyl alcohol fiber; in the raw materials for preparing the geopolymer concrete, the mass ratio of the river sand to the cementitious materials is 1:2-4; in the raw materials for preparing the geopolymer concrete, the mass ratio of the total mass of the river sand and the cementitious materials to the mass of the alkali activator is 100:20-35. The cementing material comprises metakaolin, slag, fly ash, and silica fume; wherein the metakaolin content is 60-90 wt%, the slag content is 5-15 wt%, the fly ash content is 5-10 wt%, and the silica fume content is 5-10 wt%; the specific surface area of ​​the slag is 600-800 m². 2 / kg, residue on a 45μm square-hole sieve <1%, the total content of Al2O3 and SiO2 in the slag ≥50wt%; the fly ash is Grade I calcium ash, the CaO content in the Grade I calcium ash is not less than 10%; the silica fume has a particle size of 0.1-0.3μm, and the specific surface area of ​​the silica fume is 15000-30000. . According to some embodiments of the present invention, the capsule shell is made of polymethyl methacrylate, the phase change material includes paraffin, and the particle size range of the phase change energy storage microcapsules is 20 μm - 30 μm; and / or, in a single concrete-based phase change energy storage layer, the ratio of the total mass of all the phase change energy storage microcapsules to the mass of the concrete matrix is ​​16%-32%.

[0012] According to some embodiments of the present invention, the density of the phase change energy storage microcapsule is 850. The density of the capsule shell is 1.18 g / cm³. 3 The capsule shell has a melting point of 105°C, a melting temperature of 160°C, a thermal conductivity of 0.25 W / (m·K), a specific heat capacity of 1.7 kJ / (kg·K), and a light transmittance of not less than 92%. And / or, the melting point of the phase change material is in the range of 46°C to 68°C, and the density of the phase change material is 0.8 g / cm³. 3 The phase change material has a thermal conductivity of 0.2 W / (m·K), a specific heat capacity of 2.1 kJ / (kg·K), and a latent heat of 200 kJ / kg.

[0013] According to a second aspect of the present invention, a method for preparing a concrete-based phase change thermoelectric power generation device, wherein the concrete-based phase change thermoelectric power generation device is the concrete-based phase change thermoelectric power generation device according to the first aspect of the present invention, the method for preparing the concrete-based phase change thermoelectric power generation device includes the following steps: Prepare the thermoelectric element and the concrete-based phase change energy storage layer; The concrete-based phase change energy storage layer is installed on opposite sides of the thermoelectric element in the thickness direction; The preparation of the thermoelectric element includes: The P-type thermoelectric particles, the N-type thermoelectric particles, the first copper-clad ceramic substrate, and the second copper-clad ceramic substrate are prepared. The P-type thermoelectric particles are electroplated with a 6-8 μm nickel layer, followed by a 6-8 μm tin layer, to metallize the surface of the P-type thermoelectric particles; the N-type thermoelectric particles are electroplated with a 6-8 μm nickel layer, followed by a 6-8 μm tin layer, to metallize the surface of the N-type thermoelectric particles. The P-type thermoelectric particles and the N-type thermoelectric particles are disposed on the first copper-clad ceramic substrate using a preset mold. The second copper-clad ceramic substrate is disposed on the side of the P-type thermoelectric particles and the N-type thermoelectric particles that is away from the first copper-clad ceramic substrate. The P-type thermoelectric particles, the N-type thermoelectric particles, the first wire are welded to the copper layer of the first copper-clad ceramic substrate, and the second wire is welded to the copper layer of the second copper-clad ceramic substrate to complete the fabrication of the thermoelectric element. The preparation of the concrete-based phase change energy storage layer includes: Preparation of the concrete matrix and the phase change energy storage microcapsules; A phase change energy storage aggregate is prepared by coating the surface of the phase change energy storage microcapsule with a polymer mortar. Before the concrete matrix is ​​cured, the phase change energy storage aggregate is distributed in the concrete matrix, the geopolymer mortar forming the concrete matrix is ​​stirred, the phase change energy storage aggregate and sand and gravel with a particle size of 0.1mm~0.25mm are added and stirred to obtain concrete phase change energy storage microcapsule slurry. After stirring the concrete phase change energy storage microcapsule slurry, it is poured into the first mold and cured for 25-30 days to obtain the concrete-based phase change energy storage layer.

[0014] According to the method for preparing a concrete-based phase change thermoelectric power generation device according to an embodiment of the present invention, phase change energy storage microcapsules are provided in the concrete-based phase change energy storage layer, which can play the role of storing heat. For example, the phase change energy storage microcapsules can absorb heat from the environment so that heat energy can be used at any time. Furthermore, by providing concrete-based phase change energy storage layers on opposite sides in the thickness direction of the thermoelectric element, the thermoelectric element can obtain electrical energy by utilizing the temperature difference between the two concrete-based phase change energy storage layers to provide electrical energy to the electrical device, thereby reducing the waste of heat energy and improving the utilization rate of heat energy.

[0015] According to some embodiments of the present invention, The preparation of the p-type thermoelectric particles includes: A first mixture is obtained by mixing a gelling material, a first semiconductor material, and an alkaline activator. The first mixture is transferred to a thermoelectric particle mold for curing. The cured first mixture is then demolded and polished to obtain the P-type thermoelectric particles. The preparation of the N-type thermoelectric particles includes: The gelling material, the second semiconductor material, and the alkaline activator are mixed to obtain a second mixture; The second mixture is transferred to the thermoelectric particle mold for curing, and the cured second mixture is demolded and polished to obtain the N-type thermoelectric particles; The process of depositing the P-type thermoelectric particles and the N-type thermoelectric particles onto the first copper-clad ceramic substrate using a pre-set mold includes: The first copper-clad ceramic substrate is placed on the operating table, lead-free solder is printed, and then a preset mold is placed on the surface of the first copper-clad ceramic substrate. One of the surface-metallized P-type thermoelectric particles and the surface-metallized N-type thermoelectric particles is placed into the preset mold. The preset mold is vibrated so that one of the surface-metallized P-type thermoelectric particles and the surface-metallized N-type thermoelectric particles falls into a preset position. The preset mold is flipped over, and another type of thermoelectric particle, namely the surface-metallized P-type thermoelectric particle and the surface-metallized N-type thermoelectric particle, is placed into the preset mold. The preset mold is vibrated so that the surface-metallized P-type thermoelectric particle and the other type of thermoelectric particle fall into the preset position. The preset mold includes an upper mold and a lower mold. The upper mold can be flipped to fill the surface-metallized P-type thermoelectric particles and / or the surface-metallized N-type thermoelectric particles respectively. The lower mold is used to screen the surface-metallized P-type thermoelectric particles and / or the surface-metallized N-type thermoelectric particles. The process of soldering the P-type thermoelectric particles, the N-type thermoelectric particles, the first conductor to the copper layer of the first copper-clad ceramic substrate, and the second conductor to the copper layer of the second copper-clad ceramic substrate includes: applying solder paste to the copper layers of the first and second copper-clad ceramic substrates; fixing the first conductor to the copper layer on the first copper-clad ceramic substrate; fixing the second conductor to the copper layer on the second copper-clad ceramic substrate; heating the surface-metallized P-type thermoelectric particles, the surface-metallized N-type thermoelectric particles, the first and second copper-clad ceramic substrates, the first conductor, and the second conductor as a whole, so that the heating temperature reaches the melting temperature of the lead-free solder and the solder paste, holding the temperature and then cooling it down. The preparation of the concrete matrix includes: Weigh out the river sand, cementing material, and alkali activator; The cementitious material is mixed with the river sand to obtain a solid mixture; Add the alkaline activator to the solid mixture and stir; Polyvinyl alcohol fiber is added to the solid mixture containing the alkali activator, stirred evenly, poured into a second mold, and vibrated to obtain the concrete matrix; The phase change energy storage aggregate is prepared by coating the surface of the phase change energy storage microcapsules with polymer mortar, comprising: The geopolymer mortar and the phase change energy storage microcapsules are placed in a dry disc. Water is sprayed into the disc and stirred. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules is moistened, the moistened mixture of geopolymer mortar and phase change energy storage microcapsules is poured into a disc granulator. The disc granulator is turned on and water is sprayed into the disc granulator. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules, multiple phase change energy storage aggregate particles are obtained. Multiple phase change energy storage aggregate particles are laid flat, and water is sprayed on the surface of the phase change energy storage aggregate particles. They are cured for 1-3 days. The hardened phase change energy storage aggregate particles are placed in a basin for curing at a temperature of 18-22°C with water in the basin for 25-30 days. The cured energy storage aggregate particles are then dried to obtain the phase change energy storage aggregate.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a concrete-based phase change thermoelectric power generation device according to some embodiments of the present invention; Figure 2 yes Figure 1 A schematic diagram of the thermoelectric element in a concrete-based phase change thermoelectric power generation device; Figure 3 yes Figure 1 A schematic diagram of the concrete-based phase change energy storage layer in a concrete-based phase change thermoelectric power generation device.

[0018] Figure label: 100. Concrete-based phase change thermoelectric power generation device; 1. Thermoelectric element; 2. Concrete-based phase change energy storage layer; 3. First copper-clad ceramic substrate; 4. Second copper-clad ceramic substrate; 5. P-type thermoelectric particle; 6. N-type thermoelectric particle; 71. First conductor; 72. Second conductor; 8. Concrete matrix; 9. Phase change energy storage microcapsule. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] The following is for reference. Figures 1-3 A concrete-based phase change thermoelectric power generation device 100 according to an embodiment of the present invention is described.

[0021] Reference Figures 1-3 According to a first aspect of the present invention, a concrete-based phase change thermoelectric power generation device 100 includes a thermoelectric element 1 and a concrete-based phase change energy storage layer 2. The thermoelectric element 1 includes a first copper-clad ceramic substrate 3, a second copper-clad ceramic substrate 4, P-type thermoelectric particles 5, N-type thermoelectric particles 6, a first wire 71, and a second wire 72. The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are disposed between the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. The P-type thermoelectric particles 5 are connected to the copper layer of the first copper-clad ceramic substrate 3, and the N-type thermoelectric particles 6 are connected to the copper layer of the second copper-clad ceramic substrate 4. The first wire 71 is connected to the copper layer on the first copper-clad ceramic substrate 3, and the second wire 72 is connected to the copper layer on the second copper-clad ceramic substrate 4.

[0022] The thermoelectric element 1 includes multiple P-type thermoelectric particles 5 and multiple N-type thermoelectric particles 6, which are alternately connected in series, allowing adjacent P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to be connected in series. The thermoelectric element 1 includes: a first copper-clad ceramic substrate 3, a second copper-clad ceramic substrate 4, a first wire 71, and a second wire 72. Both the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are elongated cubes with a head and a tail in the length direction. The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are alternately arranged. The head of the first P-type thermoelectric particle 5 is connected to the head of the first N-type thermoelectric particle 6 through an electrode, and the tail of the first N-type thermoelectric particle 6 is connected to the tail of the second P-type thermoelectric particle 5 through an electrode, until it is connected to the last thermoelectric particle, forming a thermoelectric particle group in which P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are alternately connected in series. The thermoelectric particle group can sense temperature differences and convert the temperature differences into electrical energy.

[0023] The first copper-clad ceramic substrate 3 is disposed below the electrode at the head end of the thermoelectric particle, and the second ceramic substrate is disposed above the electrode at the tail end of the thermoelectric particle. The first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4 serve as insulating media to prevent short circuits in the thermoelectric particle assembly. The first conductor 71 is connected to the copper layer on the first copper-clad ceramic substrate 3, and the second conductor 72 is connected to the copper layer on the second copper-clad ceramic substrate 4. For example, the first conductor 71 and the second conductor 72 can be connected to an electrical device to transmit electrical energy to the device, thereby improving the utilization rate of thermal energy.

[0024] The concrete-based phase change energy storage layer 2 is disposed on opposite sides of the thermoelectric element 1 in the thickness direction. The concrete-based phase change energy storage layer 2 includes a concrete matrix 8 and a plurality of phase change energy storage microcapsules 9 distributed in the concrete matrix 8. The phase change energy storage microcapsules 9 include a capsule shell and a phase change material disposed in the capsule shell.

[0025] The capsule shell provides support and protection for the phase change material (PCM). By placing the PCM inside the capsule shell, the possibility of damage to the PCM caused by external forces can be reduced, thus extending its service life. The PCM itself has a high energy storage density, capable of storing and releasing significant amounts of heat energy within a small volume. Furthermore, the temperature fluctuation during the PCM phase change process is relatively small, resulting in good temperature control stability for the PCM energy storage microcapsules 9. The phase change process is reversible, allowing for repeated use without affecting the PCM's performance. By distributing multiple PCM energy storage microcapsules 9 within the concrete matrix 8, the concrete-based PCM energy storage layer 2 can function as a heat storage layer, reducing the building's consumption of external heat energy and facilitating subsequent access.

[0026] For example, the phase change energy storage microcapsules 9 in the concrete-based phase change energy storage layer 2 can absorb excess heat during the day and release it at night, thereby reducing the building's dependence on external energy. Furthermore, the application of phase change materials in buildings can reduce the use of heating and cooling systems, thus alleviating the burden on the power grid, reducing building energy consumption, and reducing greenhouse gases. Moreover, the temperature change of phase change materials during the phase change process is relatively small. By distributing phase change energy storage microcapsules 9 in the concrete matrix 8, the overall temperature stability of the building can be improved, which in turn can improve the stability of indoor temperature, thus enhancing the comfort of the living and working environment.

[0027] By placing the concrete-based phase change energy storage layer 2 on opposite sides of the thickness direction of the thermoelectric element 1, the thermoelectric element 1 can convert the temperature difference between the concrete-based phase change energy storage layer 2 on both sides of the thermoelectric element 1 into electrical energy, and connect it to the electrical device through the first conductor 71 and the second conductor 72 to supply power to the electrical device. This can effectively improve the utilization rate of thermal energy.

[0028] For example, the concrete-based phase change energy storage layer 2 located on one side of the thermoelectric element 1 is located closer to the external environment of the building, while the concrete-based phase change energy storage layer 2 located on the other side of the thermoelectric element 1 is located away from the external environment of the building. The temperature difference between the external environment and the interior, for example, during the day or when there is sufficient sunlight, allows the concrete-based phase change energy storage layer 2 located closer to the external environment of the building to absorb heat from the external environment. This results in a temperature difference between the concrete-based phase change energy storage layers 2 located on opposite sides of the thermoelectric element 1. The thermoelectric element 1 can convert this temperature difference into electrical energy and transmit it to the electrical device to improve the utilization rate of thermal energy.

[0029] According to an embodiment of the present invention, the concrete-based phase change thermoelectric power generation device 100 has phase change energy storage microcapsules 9 provided in the concrete-based phase change energy storage layer 2, which can play the role of storing heat. For example, the phase change energy storage microcapsules 9 can absorb heat from the environment so that heat energy can be used at any time. Furthermore, by providing concrete-based phase change energy storage layers 2 on opposite sides in the thickness direction of the thermoelectric element 1, the thermoelectric element 1 can obtain electrical energy by utilizing the temperature difference between the two sides of the concrete-based phase change energy storage layers 2 to provide electrical energy to the electrical device, thereby reducing the waste of heat energy and improving the utilization rate of heat energy.

[0030] Reference Figures 1-3According to some embodiments of the present invention, the P-type thermoelectric particle 5 comprises a geopolymer and a first semiconductor material, the first semiconductor material comprising bismuth antimony and bismuth telluride; the N-type thermoelectric particle 6 comprises a geopolymer and a second semiconductor material, the second semiconductor material comprising bismuth selenide and bismuth telluride. The first semiconductor material in the P-type thermoelectric particle 5 is composed of bismuth antimony and bismuth telluride. Since bismuth antimony and bismuth telluride themselves have good thermoelectric properties, this can effectively improve the Seebeck coefficient of the P-type thermoelectric particle 5, enhance the ability of the P-type thermoelectric particle 5 to generate a potential difference under temperature difference, thereby improving the thermoelectric conversion efficiency of the P-type thermoelectric particle 5.

[0031] The first semiconductor material in the N-type thermoelectric particle 6 is composed of bismuth antimonide and bismuth telluride. Since bismuth selenide and bismuth telluride have good thermoelectric properties, this can effectively improve the Seebeck coefficient of the N-type thermoelectric particle 6 and enhance the ability of the N-type thermoelectric particle 6 to generate a potential difference under the action of temperature difference, thereby improving the thermoelectric conversion efficiency of the N-type thermoelectric particle 6.

[0032] When thermoelectric element 1 is working, the interaction between P-type thermoelectric particles 5 and N-type thermoelectric particles 6 can improve the overall thermoelectric conversion efficiency of thermoelectric element 1.

[0033] The raw materials for preparing the geopolymer include river sand, cementing materials, and an alkali activator. River sand gives the geopolymer strong structural strength, cementing materials enhance the adhesion between the river sand particles, and the alkali activator causes the cementing materials to form a gel, thus binding and connecting the river sand particles. By including river sand, cementing materials, and an alkali activator in the preparation of the geopolymer, it can provide a relatively stable support structure for the internal semiconductor material, reducing the possibility of damage to the semiconductor material caused by external forces. This is beneficial to improving the structural stability of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6, thereby enhancing the overall stability of the thermoelectric element 1.

[0034] Reference Figures 1-3 According to some embodiments of the present invention, in the raw materials for preparing geopolymers, the mass ratio of river sand to cementing material is 1:2-4. For example, the mass ratio of river sand to cementing material can be 1:2, 1:3, or 1:4. The cementing material accounts for a relatively high proportion of the river sand, which allows as much river sand as possible to be bonded and formed. This enables the geopolymer to form a more compact structure, which can increase the overall density of the geopolymer and reduce its porosity.

[0035] Reference Figures 1-3According to some embodiments of the present invention, in the raw materials for preparing geopolymers, the mass ratio of the total mass of river sand and cementitious materials to the mass of alkali activator is 100:20-35. For example, the mass ratio of the total mass of river sand and cementitious materials to the mass of alkali activator is 100:20, 100:23, 100:26, 100:29, 100:32, or 100:35, which allows the alkali activator to effectively and fully activate the cementitious materials, enabling the geopolymer to form a relatively compact structure. By maintaining an appropriate proportion of alkali activator relative to the total mass of river sand and cementitious materials, the cementitious materials will not react incompletely due to insufficient alkali activator, nor will the performance of the geopolymer or the manufacturing cost be affected by excessive alkali activator.

[0036] Reference Figures 1-3 According to some embodiments of the present invention, in the P-type thermoelectric particles 5, the total mass ratio of river sand and cementitious material to the mass ratio of the first semiconductor material is 100:20-40. For example, the total mass ratio of river sand and cementitious material to the mass ratio of the first semiconductor material can be 100:20, 100:25, 100:30, 100:35, or 100:40. This makes a more reasonable proportional relationship between the geopolymer and the first semiconductor material, allowing the first semiconductor material to exert its thermoelectric performance advantages. The geopolymer can also provide stable support and protection for the first semiconductor material, thus improving the stability of the P-type thermoelectric particles 5.

[0037] Reference Figures 1-3 According to some embodiments of the present invention, in the N-type thermoelectric particles 6, the total mass ratio of river sand and cementitious material to the second semiconductor material is 100:20-40. For example, the total mass ratio of river sand and cementitious material to the second semiconductor material can be 100:20, 100:25, 100:30, 100:35, or 100:40. This creates a more reasonable ratio between the geopolymer and the second semiconductor material, allowing the second semiconductor material to exert its thermoelectric performance advantages. The geopolymer can also provide stable support and protection for the second semiconductor material, thus improving the stability of the N-type thermoelectric particles 6.

[0038] Reference Figures 1-3 According to some embodiments of the present invention, the cementing material includes metakaolin, slag, fly ash, and silica fume. Metakaolin, slag, fly ash, and silica fume have high activity and can react with an alkali activator to generate a gel substance. The generated gel substance can enhance the adhesion within the geopolymer, improve the overall strength and toughness of the geopolymer, thereby increasing the strength of the geopolymer and providing a more stable support for the semiconductor material, making the semiconductor material less susceptible to damage when subjected to impact or vibration.

[0039] Fly ash and slag contain abundant silicon and aluminum oxides, which can form a geopolymer skeleton structure under the activation of alkali activators. This can improve the compressive strength and durability of the geopolymer. The addition of slag can also accelerate the geopolymer reaction rate, shorten the curing time of the geopolymer, and improve the geopolymer's resistance to chemical corrosion. This makes the geopolymer have good resistance to acid and alkali environments, and can also improve the geopolymer's fire resistance and impermeability.

[0040] Furthermore, fly ash and slag are industrial wastes. Compared to cementitious materials, including cement-based materials, this can reduce carbon dioxide emissions from the calcination of cement clinker during cement production. Additionally, fly ash and slag are relatively inexpensive industrial wastes, which can lower the material costs of geopolymers. Moreover, utilizing industrial wastes such as fly ash and slag can effectively reduce solid waste accumulation, further reducing environmental pollution.

[0041] Reference Figures 1-3 According to some embodiments of the present invention, the content of metakaolin is 60-90 wt%, the content of slag is 5-15 wt%, the content of fly ash is 5-10 wt%, and the content of silica fume is 5-10 wt%. For example, the content of metakaolin can be 60 wt%, 70 wt%, 75 wt%, 80 wt%, 85 wt%, or 90 wt%, the content of slag can be 5 wt%, 8 wt%, 10 wt%, 12 wt%, or 15 wt%, the content of fly ash can be 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 10 wt%, and the content of silica fume can be 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 10 wt%.

[0042] With a content of 60-90 wt% metakaolin, 5-15 wt% slag, 5-10 wt% fly ash, and 5-10 wt% silica fume, the proportions of these materials are relatively reasonable. This allows the cementitious materials and alkali activators to react more fully, producing more gel substances. This effectively enhances the adhesion within the geopolymer, improves the overall strength and toughness of the geopolymer, and thus provides a more stable support for semiconductor materials.

[0043] The specific surface area of ​​slag is 600-800 m². 2 / kg, residue on 45μm square mesh sieve <1%, total content of Al2O3 and SiO2 in slag ≥50wt%, for example, the specific surface area of ​​slag can be 600m² 2 / kg, 650m 2 / kg, 700m 2 / kg, 750m 2 / kg or 800m 2The total content of Al2O3 and SiO2 in the slag can be 50wt%, 55wt%, 60wt%, 65wt%, or 70wt%. The slag content is 5-15wt%, and its specific surface area is 600-800 m² / kg. 2 The slag particles are small and highly active, and can be well mixed with other materials to generate more gel substances, thereby increasing the density of the geopolymer and enhancing its mechanical properties and impermeability. Furthermore, the slag contains... and A total content of ≥50wt% can improve the stability of cementitious materials, thereby helping to improve the durability and chemical stability of geopolymers.

[0044] The fly ash is Grade I calcium ash, with a CaO content of not less than 10%, a silica fume particle size of 0.1-0.3 μm, and a specific surface area of ​​15,000-30,000. For example, with CaO contents of 10%, 15%, 20%, 25%, and 40%, the particle size of the silica fume can be 0.1μm, 0.15μm, 0.2μm, 0.25μm, and 0.3μm, and the specific surface area of ​​the silica fume can be 15000. 20000 25000 30000 .

[0045] The fly ash is Grade I calcium ash with a fly ash content of 5-10 wt%, a CaO content of not less than 10%, and a silica fume particle size of 0.1-0.3 μm and a specific surface area of ​​15,000-30,000. This allows fly ash and silica fume to mix better with other materials, generating more gel substances and increasing the density of the geopolymer.

[0046] Reference Figures 1-3 According to some embodiments of the present invention, the alkali activator is a mixture of a strong alkali solution and a water glass solution, and the mass ratio of the strong alkali solution to the water glass solution is 3:6-8. The strong alkali solution and the water glass solution can react with metakaolin, slag, fly ash, and silica fume to cause the cementitious material to produce a gel substance, thereby forming a polymer with river sand to form a geopolymer.

[0047] For example, the weight ratio of strong alkali solution to water glass solution can be 3:6, 3:7, or 3:8. By using a mass ratio of 3:6-8 for strong alkali solution and water glass solution, the proportion of strong alkali solution to water glass solution can be made more reasonable, allowing the alkali activator to react more fully with the cementitious material to effectively produce gel substances, and also making the reaction efficiency between the alkali activator and the cementitious material higher.

[0048] Reference Figures 1-3 According to some embodiments of the present invention, the concrete matrix 8 comprises geopolymer concrete, the raw materials for which the geopolymer concrete is prepared include river sand, cementitious materials, alkali activators, and polyvinyl alcohol fibers. River sand can give the geopolymer concrete strong structural strength, cementitious materials can enhance the bonding force between river sand particles, and alkali activators can cause the cementitious materials to form a gel substance, thereby bonding the river sand particles together. By including river sand, cementitious materials, and alkali activators in the raw materials for the geopolymer concrete, it achieves high structural strength, providing a relatively stable support structure for the internal phase change energy storage microcapsules 9, reducing the possibility of damage to the phase change energy storage microcapsules 9 due to external forces, and thus improving the overall stability of the concrete-based phase change energy storage layer 2.

[0049] Reference Figures 1-3 According to some embodiments of the present invention, in the raw materials for preparing geopolymer concrete, the mass ratio of river sand to cementitious material is 1:2-4. For example, the mass ratio of river sand to cementitious material can be 1:2, 1:3 or 1:4. The cementitious material accounts for a relatively high proportion of river sand, which enables as much river sand as possible to be bonded and formed. This allows the geopolymer concrete to form a more compact structure, which can increase the overall density of the geopolymer concrete and reduce the porosity of the geopolymer concrete.

[0050] Reference Figures 1-3 According to some embodiments of the present invention, in the raw materials for preparing geopolymer concrete, the mass ratio of the total mass of river sand and cementitious materials to the mass of alkali activator is 100:20-35. For example, the mass ratio of the total mass of river sand and cementitious materials to the mass of alkali activator is 100:20, 100:23, 100:26, 100:29, 100:32 or 100:35, so that the alkali activator can effectively and fully activate the activity of the cementitious materials, so that the geopolymer concrete forms a relatively dense structure. By using an appropriate proportion of alkali activator relative to the total mass of river sand and cementitious materials, the cementitious materials will not react incompletely due to too little alkali activator, nor will the performance of the geopolymer concrete be affected or the manufacturing cost increased due to too much alkali activator.

[0051] Reference Figures 1-3 According to some embodiments of the present invention, the cementing material includes metakaolin, slag, fly ash, and silica fume. Metakaolin, slag, fly ash, and silica fume have high activity and can react with alkali activators to generate gel substances. The generated gel substances can enhance the internal adhesion of geopolymer concrete, improve the overall strength and toughness of geopolymer concrete, thereby increasing the strength of geopolymer concrete and providing more stable support for phase change energy storage microcapsules 9, making phase change energy storage microcapsules 9 less prone to damage when subjected to impact or vibration.

[0052] Reference Figures 1-3 According to some embodiments of the present invention, the content of metakaolin is 60-90 wt%, the content of slag is 5-15 wt%, the content of fly ash is 5-10 wt%, and the content of silica fume is 5-10 wt%. For example, the content of metakaolin can be 60 wt%, 70 wt%, 75 wt%, 80 wt%, 85 wt%, or 90 wt%, the content of slag can be 5 wt%, 8 wt%, 10 wt%, 12 wt%, or 15 wt%, the content of fly ash can be 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 10 wt%, and the content of silica fume can be 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 10 wt%.

[0053] With a content of 60-90 wt% metakaolin, 5-15 wt% slag, 5-10 wt% fly ash, and 5-10 wt% silica fume, the proportions of these materials are relatively reasonable. This allows the cementitious materials and alkali activator to react more fully, producing more gel substances. This effectively enhances the adhesion within the geopolymer concrete, improves its overall strength and toughness, and provides a more stable support for the phase change energy storage microcapsules 9.

[0054] The specific surface area of ​​slag is 600-800 m². 2 / kg, residue on 45μm square mesh sieve <1%, total content of Al2O3 and SiO2 in slag ≥50wt%, for example, the specific surface area of ​​slag can be 600m² 2 / kg, 650m 2 / kg, 700m 2 / kg, 750m 2 / kg or 800m 2 The total content of Al2O3 and SiO2 in the slag can be 50wt%, 55wt%, 60wt%, 65wt%, or 70wt%. The slag content is 5-15wt%, and its specific surface area is 600-800 m² / kg. 2 The slag particles are small and highly active, and can be well mixed with other materials to generate more gel substances, thereby improving the density of geopolymer concrete, enhancing its mechanical properties and impermeability. Furthermore, the slag contains... and A total content of ≥50wt% can improve the stability of cementitious materials, thereby helping to improve the durability and chemical stability of geopolymer concrete.

[0055] The fly ash is Grade I calcium ash, with a CaO content of not less than 10%, a silica fume particle size of 0.1-0.3 μm, and a specific surface area of ​​15,000-30,000. For example, with CaO contents of 10%, 15%, 20%, 25%, and 40%, the particle size of the silica fume can be 0.1μm, 0.15μm, 0.2μm, 0.25μm, and 0.3μm, and the specific surface area of ​​the silica fume can be 15000. 20000 25000 30000 .

[0056] The fly ash is Grade I calcium ash with a fly ash content of 5-10 wt%, a CaO content of not less than 10%, and a silica fume particle size of 0.1-0.3 μm and a specific surface area of ​​15,000-30,000. This allows fly ash and silica fume to mix better with other materials, generating more gel substances and improving the density of geopolymer concrete.

[0057] Reference Figures 1-3 According to some embodiments of the present invention, the capsule shell is made of polymethyl methacrylate (PMMA), the phase change material includes paraffin wax, and the particle size range of the phase change energy storage microcapsules 9 is 20 μm-30 μm. PMMA has high strength and hardness; by using PMMA as the capsule shell material, it can provide better protection for the internal phase change material, reducing or avoiding the possibility of leakage of the phase change material due to capsule shell rupture caused by external forces. Since paraffin wax itself has good latent heat storage properties, by including paraffin wax as the phase change material, the phase change energy storage microcapsules 9 can better store heat. For example, the phase change energy storage microcapsules 9 can better absorb thermal energy from the environment, so that this heat can be readily accessed later, improving the utilization rate of thermal energy.

[0058] For example, the particle size of the phase change energy storage microcapsule 9 can be 20μm, 22μm, 25μm, 28μm, or 30μm. By using a particle size range of 20μm-30μm, the phase change energy storage microcapsule 9 can have a larger specific surface area, which can accelerate the heat exchange rate with the surrounding environment, enabling the phase change energy storage microcapsule 9 to quickly absorb or release heat. It can also be better dispersed in the concrete matrix 8, for example, it can facilitate the uniform distribution of the phase change energy storage microcapsule 9 in the concrete matrix 8. The uniformly dispersed phase change energy storage microcapsule 9 can more effectively play its thermal management role, reduce the local overheating or overcooling phenomenon of the concrete matrix phase change energy storage layer 2, and also help improve the stability of the thermoelectric conversion efficiency of thermoelectric particles at different positions of the thermoelectric element 1.

[0059] For example, polymethyl methacrylate can be embedded with phase change materials to enhance the thermal energy storage capacity of the capsule shell.

[0060] Reference Figures 1-3According to some embodiments of the present invention, in a single concrete-based phase change energy storage layer 2, the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of the concrete matrix 8 is 16%-32%. For example, the ratio of the total mass of the phase change energy storage microcapsules 9 to the mass of the concrete matrix 8 can be 16%, 20%, 24%, 28%, or 32%. By maintaining a ratio of 16%-32% for the total mass of all phase change energy storage microcapsules 9 to the mass of the concrete matrix 8, the concrete-based phase change energy storage layer 2 can have a higher specific heat capacity, effectively enhancing its thermal energy storage capacity. It can also give the concrete-based phase change energy storage layer 2 stronger compressive strength, reducing the possibility of cracks appearing in the concrete-based phase change energy storage layer 2.

[0061] Reference Figures 1-3 According to some embodiments of the present invention, the density of the phase change energy storage microcapsule 9 is 850. The density of the capsule shell is 1.18 g / cm³. 3 The capsule shell has a melting point of 105°C, a melting temperature of 160°C, a thermal conductivity of 0.25 W / (m·K), a specific heat capacity of 1.7 kJ / (kg·K), and a light transmittance of not less than 92%.

[0062] The density of the phase change energy storage microcapsule 9 is 850. This can reduce the mass of the phase change energy storage microcapsule 9, which helps to make the overall concrete-based phase change energy storage layer 2 lighter.

[0063] The capsule shell density is 1.18 g / cm³. 3 This allows the capsule shell to provide good physical protection for the internal phase change material, enhances the capsule shell's resistance to pressure and wear, reduces or prevents the capsule shell from breaking due to external forces, thereby extending the service life of the phase change energy storage microcapsule 9 and enhancing the stability of the phase change energy storage microcapsule 9.

[0064] The capsule shell has a melting point of 105°C and a melting temperature of 160°C, indicating that the capsule shell remains solid below this temperature. This maintains the shape and structural integrity of the capsule shell and effectively encapsulates the internal phase change material. This reduces the possibility of the capsule shell melting and deforming, thereby enhancing the stability and reliability of the phase change energy storage microcapsule 9.

[0065] The capsule shell has a thermal conductivity of 0.25 W / (m·K) and a specific heat capacity of 1.7 kJ / (kg·K), indicating that the capsule shell has a certain thermal conductivity, which allows heat to be transferred relatively quickly from the capsule shell to the phase change material, enabling the internal phase change material to undergo a phase change in a timely manner and realize the function of storing or releasing energy.

[0066] With a specific heat capacity of 1.7 kJ / (kg•K), the capsule shell has a good heat storage capacity to store a certain amount of thermal energy.

[0067] With a capsule shell transmittance of not less than 92%, for example, when a concrete-based phase change thermal energy storage power generation device is applied to solar energy-related scenarios, the higher transmittance allows more solar energy to pass through the capsule shell and be absorbed by the internal phase change material, thereby improving the utilization efficiency of solar energy.

[0068] Reference Figures 1-3 According to some embodiments of the present invention, the melting point of the phase change material is in the range of 46°C to 68°C, and the density of the phase change material is 0.8 g / cm³. 3 The thermal conductivity of the phase change material is 0.2 W / (m·K), the specific heat capacity of the phase change material is 2.1 kJ / (kg·K), and the latent heat of the phase change material is 200 kJ / kg.

[0069] The melting point range of phase change materials is 46°C to 68°C, indicating that phase change materials can effectively absorb and store a large amount of heat or release heat through the phase change process.

[0070] The density of the phase change material is 0.8 g / cm³. 3 The relatively low density of the phase change material allows the phase change energy storage microcapsule 9 to have a smaller mass, which helps to reduce the overall weight of the concrete-based phase change energy storage layer 2.

[0071] The thermal conductivity of the phase change material is 0.2 W / (m·K), indicating that the phase change material has a certain thermal conductivity, which enables it to absorb and store heat or release heat in a good way. Heat can be transferred to the phase change material in a timely manner, so that it can undergo a phase change quickly to store or release heat.

[0072] The specific heat capacity of the phase change material (PCM) is 2.1 kJ / (kg·K), indicating that the PCM absorbs or releases a significant amount of heat per unit mass increase or decrease. This allows the PCM to absorb or release a large amount of heat during temperature changes. For example, in solar thermal systems, PCM can absorb and store a large amount of heat during the day and release it slowly at night, effectively reducing temperature fluctuations and improving system stability and energy efficiency.

[0073] The latent heat of phase change material is 200 kJ / kg, indicating that during the phase change process, a unit mass of phase change material can absorb or release a large amount of heat. This allows the phase change material to quickly absorb a large amount of heat and melt when the temperature reaches the melting point, thus achieving efficient energy storage.

[0074] Reference Figures 1-3According to a second aspect embodiment of the present invention, the concrete-based phase change thermoelectric power generation device 100 is the same as the concrete-based phase change thermoelectric power generation device 100 described in the first aspect embodiment of the present invention. The preparation method of the concrete-based phase change thermoelectric power generation device 100 includes the following steps: Prepare thermoelectric element 1 and concrete-based phase change energy storage layer 2; The concrete-based phase change energy storage layer 2 is installed on opposite sides of the thermoelectric element 1 in the thickness direction so that the thermoelectric element 1 can convert the temperature difference between the two concrete-based phase change energy storage layers 2 into electrical energy. The preparation of thermoelectric element 1 includes: Prepare P-type thermoelectric particles 5, N-type thermoelectric particles 6, a first copper-clad ceramic substrate 3, and a second copper-clad ceramic substrate 4; A 6-8 μm nickel layer is electroplated onto the P-type thermoelectric particle 5, followed by a 6-8 μm tin layer, to metallize the surface of the P-type thermoelectric particle 5. The metal layer formed on the surface of the P-type thermoelectric particle 5 has good conductivity, which can reduce the power loss during the power transmission process and help enhance the thermoelectric conversion efficiency of the thermoelectric element 1. A 6-8 μm nickel layer is electroplated onto the N-type thermoelectric particle 6, followed by a 6-8 μm tin layer, to metallize the surface of the N-type thermoelectric particle 6. The metal layer formed on the surface of the N-type thermoelectric particle 6 has good electrical conductivity, which can reduce the power loss during the power transmission process and help enhance the thermoelectric conversion efficiency of the thermoelectric element 1. P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are placed on the first copper-clad ceramic substrate 3 through a preset mold. The preset mold can accurately place the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 into the preset position. The second copper-clad ceramic substrate 4 is disposed on the side of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 away from the first copper-clad ceramic substrate 3, so that the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 can be connected to the second copper-clad ceramic substrate 4, thereby forming a relatively complete current loop and realizing effective thermoelectric conversion. The P-type thermoelectric particles 5, N-type thermoelectric particles 6, and the first wire 71 are welded to the copper layer of the first copper-clad ceramic substrate 3, and the second wire 72 is welded to the copper layer of the second copper-clad ceramic substrate 4 to complete the fabrication of the thermoelectric element 1. The welding connection makes the connection between the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 and the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, the first wire 71 and the copper layer of the first copper-clad ceramic substrate 3, and the second wire 72 and the copper layer of the second copper-clad ceramic substrate 4 simple and has strong stability. The preparation of the concrete-based phase change energy storage layer 2 includes: Preparation of concrete matrix 8 and phase change energy storage microcapsules 9; By coating the surface of the phase change energy storage microcapsule 9 with polymer mortar, a phase change energy storage aggregate is prepared. Coating the surface of the phase change energy storage microcapsule 9 with polymer mortar can effectively protect the phase change energy storage microcapsule 9, reduce the possibility of damage to the phase change energy storage microcapsule 9 due to external forces, and also allow the phase change energy storage microcapsule 9 to be better dispersed in the concrete matrix 8. Before the concrete matrix 8 is cured, phase change energy storage aggregate is distributed in the concrete matrix 8. The geopolymer mortar forming the concrete matrix 8 is stirred, and phase change energy storage aggregate and sand with a particle size of 0.1mm~0.25mm are added and stirred to obtain concrete phase change energy storage microcapsule slurry. For example, the particle size of the sand can be 0.1mm, 0.15mm, 0.2mm, or 0.25mm. By adding phase change energy storage aggregate and sand with a particle size of 0.1mm~0.25mm to the geopolymer mortar forming the concrete matrix 8, the structural strength of the concrete phase change energy storage microcapsule slurry can be enhanced. After stirring the concrete phase change energy storage microcapsule slurry, the phase change energy storage aggregate can be more evenly dispersed in the geopolymer mortar that forms the concrete matrix 8. It is then poured into the first mold and cured for 25-30 days to obtain the concrete-based phase change energy storage layer 2. The cured concrete-based phase change energy storage layer 2 can be formed, so that the concrete-based phase change energy storage layer 2 has strong compressive strength.

[0075] According to the method for preparing the concrete-based phase change thermoelectric power generation device 100 of the present invention, the phase change energy storage microcapsules 9 are provided in the concrete-based phase change energy storage layer 2, which can play the role of storing heat. For example, the phase change energy storage microcapsules 9 can absorb heat from the environment so that heat energy can be used at any time. Furthermore, by providing concrete-based phase change energy storage layers 2 on opposite sides in the thickness direction of the thermoelectric element 1, the thermoelectric element 1 can obtain electrical energy by utilizing the temperature difference between the two sides of the concrete-based phase change energy storage layers 2 to provide electrical energy to the electrical device, thereby reducing the waste of heat energy and improving the utilization rate of heat energy.

[0076] Reference Figures 1-3 According to some embodiments of the present invention, the preparation of p-type thermoelectric particles 5 includes: A first mixture is obtained by mixing a cementitious material, a first semiconductor material, and an alkaline activator. For example, the mixing method can be stirring, with a stirring rate of 300-500 r / min and a stirring time of 3-5 min. For example, the stirring rate can be 300 r / min, 350 r / min, 400 r / min, 450 r / min, or 500 r / min; the stirring time can be 3 min, 4 min, or 5 min, which allows the cementitious material, the first semiconductor material, and the alkaline activator to react more fully and generate the first mixture. The first mixture is transferred to a thermoelectric particle mold for curing. The cured first mixture is demolded and polished to obtain P-type thermoelectric particles 5, which can form solidified P-type thermoelectric particles 5. The preparation of N-type thermoelectric particles 6 includes: A second mixture is obtained by mixing a cementitious material, a second semiconductor material, and an alkaline activator. For example, the mixing method can be stirring, with a stirring rate of 300-500 r / min and a stirring time of 3-5 min. For example, the stirring rate can be 300 r / min, 350 r / min, 400 r / min, 450 r / min, or 500 r / min; the stirring time can be 3 min, 4 min, or 5 min, which allows the cementitious material, the second semiconductor material, and the alkaline activator to react more fully and generate the second mixture. The second mixture is transferred to a thermoelectric particle mold for curing. The cured second mixture is demolded and polished to obtain N-type thermoelectric particles 6, which can form solidified N-type thermoelectric particles 6. P-type thermoelectric particles 5 and N-type thermoelectric particles 6 are deposited on the first copper-clad ceramic substrate 3 using a pre-set mold, including: The first copper-clad ceramic substrate 3 is placed on the operating table, lead-free solder is printed, and then a preset mold is placed on the surface of the first copper-clad ceramic substrate 3. One of the surface-metallized P-type thermoelectric particles 5 and surface-metallized N-type thermoelectric particles 6 is placed into the preset mold. The preset mold is vibrated so that one of the surface-metallized P-type thermoelectric particles 5 and surface-metallized N-type thermoelectric particles 6 falls into the preset position. Flip the preset mold and put another type of thermoelectric particle, P-type thermoelectric particle 5 and N-type thermoelectric particle 6 with surface metallization, into the preset mold. Vibrate the preset mold to make the other type of thermoelectric particle, P-type thermoelectric particle 5 and N-type thermoelectric particle 6 with surface metallization fall into the preset position. The preset mold includes an upper mold and a lower mold. The upper mold can be flipped to fill with surface-metallized P-type thermoelectric particles 5 and / or surface-metallized N-type thermoelectric particles 6 respectively. The lower mold is used to screen surface-metallized P-type thermoelectric particles 5 and / or surface-metallized N-type thermoelectric particles 6. Place the first copper-clad ceramic substrate 3 on a matching operating table, print lead-free solder, then place a preset mold, evenly sprinkle one of P-type thermoelectric particles 5 or N-type thermoelectric particles 6, vibrate the preset mold, so that one of the thermoelectric particles can be evenly distributed on the first copper-clad ceramic substrate 3, and so that one of the thermoelectric particles can fall accurately into the preset position. Remove the upper mold, remove excess thermoelectric particles, flip the upper mold to the other side and put it back on the operating table, put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, so that the other type of thermoelectric particle can be evenly distributed on the first copper-clad ceramic substrate 3, and the other type of thermoelectric particle can fall accurately into the preset position. After all the thermoelectric particles are filled, the preset mold is removed, and then the second copper-clad ceramic substrate 4 is positioned through the groove on the operating table to accurately cover the top of the thermoelectric particles. The process of soldering P-type thermoelectric particles 5, N-type thermoelectric particles 6, and the first wire 71 to the copper layer of the first copper-clad ceramic substrate 3, and soldering the second wire 72 to the copper layer of the second copper-clad ceramic substrate 4, includes: Solder paste is applied to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. The first conductor 71 is fixed to the copper layer on the first copper-clad ceramic substrate 3, and the second conductor 72 is fixed to the copper layer on the second copper-clad ceramic substrate 4, so that the first conductor 71 and the copper layer on the first copper-clad ceramic substrate 3, and the second conductor 72 and the copper layer on the second copper-clad ceramic substrate 4 are soldered together. The surface-metallized P-type thermoelectric particles 5, the surface-metallized N-type thermoelectric particles 6, the first copper-clad ceramic substrate 3, the second copper-clad ceramic substrate 4, the first conductor 71 and the second conductor 72 are heated together to the melting temperature of lead-free solder and solder paste. After holding at the temperature, the temperature is lowered. For example, the surface-metallized P-type thermoelectric particles 5, the surface-metallized N-type thermoelectric particles 6, the first copper-clad ceramic substrate 3, the second copper-clad ceramic substrate 4, the first conductor 71 and the second conductor 72 can be placed together on a water cooling platform. The preparation of the concrete matrix 8 includes: Weigh out the river sand, cementing material, and alkali activator; The cementitious material is mixed with river sand to obtain a solid mixture. Slag, metakaolin, silica fume and fly ash are dry-mixed and then river sand is added. After dry-mixing and mixing, a solid mixture is obtained. An alkaline activator is added to the solid mixture and stirred to cause the gelling material to form a gel. Polyvinyl alcohol fiber is added to the solid mixture with added alkali activator, stirred evenly and poured into the second mold. After vibration, concrete matrix 8 is obtained. For example, a titanium alloy ultrasonic vibrator can be placed in the second mold, which can make the solid mixture and polyvinyl alcohol fiber in the second mold more evenly mixed. After vibration, a concrete matrix 8 with homogeneous fiber dispersion is obtained. Phase change energy storage aggregate is prepared by coating the surface of phase change energy storage microcapsules 9 with polymer mortar, including: Geopolymer mortar and phase change energy storage microcapsules 9 are placed in a dry disc. Water is sprayed into the disc and stirred to keep the water, geopolymer mortar and phase change energy storage microcapsules 9 evenly mixed. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, the wet mixture is poured into a disc granulator to make the phase change energy storage microcapsules 9 evenly dispersed in the geopolymer mortar. The disc granulator is turned on and water is sprayed into the disc granulator. For example, the speed of the disc granulator can be 30 r / min and the tilt angle can be 45°. Through the centrifugal force, friction force and gravity generated by the rotation, the raw materials gradually form particles. At this time, the cohesion is not high and the overall structure is still relatively loose. By adding water, the geopolymer mortar can coat the surface of the phase change energy storage microcapsules 9. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. Multiple phase change energy storage aggregate particles are laid flat. At this stage, the compressive strength of the phase change energy storage aggregate particles is not high. Laying them flat can reduce or avoid deformation or damage caused by bulk accumulation. Water is sprayed on the surface of the phase change energy storage aggregate particles to keep them moist and prevent water shortage during the hardening process, which would affect the hydration reaction. If the water shortage is severe, it will not be conducive to improving the strength and bonding of the particles. Curing is carried out for 1-3 days, for example, 1 day. After curing, the phase change energy storage aggregate particles are placed in a basin for curing at a temperature of 18-22℃ with water in the basin for 25-30 days, for example, 20℃ for 28 days. After curing, the energy storage aggregate particles are dried to obtain phase change energy storage aggregate.

[0077] The following is for reference. Figures 1-3 The fabrication process of a concrete-based phase change thermoelectric power generation device 100 according to five embodiments is described.

[0078] Example 1: Preparation of a concrete-based phase change thermoelectric power generation device 100A1: S1: Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar; The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S2: Add the first semiconductor material to the intermediate material polymer mortar obtained in step S1, transfer it into the electrode mold and cure it at a temperature of 20°C for 24 hours, then demold and polish it to obtain P-type thermoelectric particles 5. The second semiconductor material was added to the intermediate material polymer slurry obtained in step S1, and then transferred into an electrode mold and cured at 20°C for 24 hours. After demolding and polishing, N-type thermoelectric particles 6 were obtained. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30; S3: The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 obtained in step S2 are uniformly electroplated with a 7μm nickel layer, and then a 7μm tin layer is plated on them to metallize the surfaces of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6. S4: Place the first copper-clad ceramic substrate 3 on the matching operating table, print lead-free solder, and then place the preset mold (the preset mold includes an upper mold and a lower mold. The upper mold can be flipped up and down to fill P-type thermoelectric particles 5 and N-type thermoelectric particles 6 respectively. The lower mold is used to screen P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to ensure that the two types of thermoelectric particles are not misfilled and to accurately position them on the copper layer of the first copper-clad ceramic substrate 3). Sprinkle one of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 evenly, and vibrate the preset mold to make one of the thermoelectric particles fall accurately into the preset position. S5: Remove the upper layer of the preset mold, remove excess particles, remove the upper mold and flip it to the other side and put it back on the operating table. Put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, and make the other type of thermoelectric particle fall accurately into the preset position. S6: After all the thermoelectric particles are filled, remove the preset mold, and then position the second copper-clad ceramic substrate 4 through the groove on the operating table and cover the top of the thermoelectric particles. S7: Apply solder paste to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, fix the first conductor 71 to the copper layer on the first copper-clad ceramic substrate 3, and fix the second conductor 72 to the copper layer on the second copper-clad ceramic substrate 4. S8: The surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the heating platform and fixed. The heating temperature is raised to 350°C to ensure that the lead-free solder and solder paste melt. After holding at the temperature for a preset time, the surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the water cooling platform for cooling. S9: Place the geopolymer mortar and phase change energy storage microcapsules 9 into a dry disc, spray water into the disc and stir. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, pour the moistened mixture of geopolymer mortar and phase change energy storage microcapsules 9 into a disc granulator. Turn on the disc granulator, set the speed of the disc granulator to 30 r / min and the tilt angle to 45°. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. S10: Spread multiple phase change energy storage aggregate particles evenly, spray water on the surface of the phase change energy storage aggregate particles, cure for 1 day, put the hardened phase change energy storage aggregate particles into a basin for curing, the curing temperature is 20℃ and there is water in the basin, cure for 28 days, and dry the cured energy storage aggregate particles to obtain phase change energy storage aggregate. S11. Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar. The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S13. Add polyvinyl alcohol fiber to the solid mixture with added alkali activator, stir evenly, pour into the second mold, and vibrate to obtain concrete matrix 8. S14: Take phase change energy storage aggregate, concrete matrix 8 (the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of concrete matrix 8 is 8%) and sand and gravel, stir at a high speed for 30 seconds, pause for 90 seconds, and then stir at a high speed for 60 seconds to obtain concrete phase change energy storage microcapsule slurry. S15: Pour the concrete phase change energy storage microcapsule slurry into the first mold, and bring it into contact with the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. After curing for 28 days, a concrete-based phase change thermoelectric power generation device 100A1 is obtained.

[0079] Example 2: Preparation of concrete-based phase change thermoelectric power generation device 100A2: S1: Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar; The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S2: Add the first semiconductor material to the intermediate material polymer mortar obtained in step S1, transfer it into the electrode mold and cure it at a temperature of 20°C for 24 hours, then demold and polish it to obtain P-type thermoelectric particles 5. The second semiconductor material was added to the intermediate material polymer slurry obtained in step S1, and then transferred into an electrode mold and cured at 20°C for 24 hours. After demolding and polishing, N-type thermoelectric particles 6 were obtained. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30; S3: The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 obtained in step S2 are uniformly electroplated with a 7μm nickel layer, and then a 7μm tin layer is plated on them to metallize the surfaces of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6. S4: Place the first copper-clad ceramic substrate 3 on the matching operating table, print lead-free solder, and then place the preset mold (the preset mold includes an upper mold and a lower mold. The upper mold can be flipped up and down to fill P-type thermoelectric particles 5 and N-type thermoelectric particles 6 respectively. The lower mold is used to screen P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to ensure that the two types of thermoelectric particles are not misfilled and to accurately position them on the copper layer of the first copper-clad ceramic substrate 3). Sprinkle one of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 evenly, and vibrate the preset mold to make one of the thermoelectric particles fall accurately into the preset position. S5: Remove the upper layer of the preset mold, remove excess particles, remove the upper mold and flip it to the other side and put it back on the operating table. Put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, and make the other type of thermoelectric particle fall accurately into the preset position. S6: After all the thermoelectric particles are filled, remove the preset mold, and then position the second copper-clad ceramic substrate 4 through the groove on the operating table and cover the top of the thermoelectric particles. S7: Apply solder paste to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, fix the first conductor 71 to the copper layer on the first copper-clad ceramic substrate 3, and fix the second conductor 72 to the copper layer on the second copper-clad ceramic substrate 4. S8: The surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the heating platform and fixed. The heating temperature is raised to 350°C to ensure that the lead-free solder and solder paste melt. After holding at the temperature for a preset time, the surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the water cooling platform for cooling. S9: Place the geopolymer mortar and phase change energy storage microcapsules 9 into a dry disc, spray water into the disc and stir. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, pour the moistened mixture of geopolymer mortar and phase change energy storage microcapsules 9 into a disc granulator. Turn on the disc granulator, set the speed of the disc granulator to 30 r / min and the tilt angle to 45°. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. S10: Spread multiple phase change energy storage aggregate particles evenly, spray water on the surface of the phase change energy storage aggregate particles, cure for 1 day, put the hardened phase change energy storage aggregate particles into a basin for curing, the curing temperature is 20℃ and there is water in the basin, cure for 28 days, and dry the cured energy storage aggregate particles to obtain phase change energy storage aggregate. S11. Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar. The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S13. Add polyvinyl alcohol fiber to the solid mixture with added alkali activator, stir evenly, pour into the second mold, and vibrate to obtain concrete matrix 8. S14: Take phase change energy storage aggregate, concrete matrix 8 (the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of concrete matrix 8 is 16%) and sand and gravel, stir at a high speed for 30 seconds, pause for 90 seconds, and then stir at a high speed for 60 seconds to obtain concrete phase change energy storage microcapsule slurry. S15: Pour the concrete phase change energy storage microcapsule slurry into the first mold, and bring it into contact with the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. After curing for 28 days, a concrete-based phase change thermoelectric power generation device 100A2 is obtained.

[0080] Example 3: Preparation of concrete-based phase change thermoelectric power generation device 100A3: S1: Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar; The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S2: Add the first semiconductor material to the intermediate material polymer mortar obtained in step S1, transfer it into the electrode mold and cure it at a temperature of 20°C for 24 hours, then demold and polish it to obtain P-type thermoelectric particles 5. The second semiconductor material was added to the intermediate material polymer slurry obtained in step S1, and then transferred into an electrode mold and cured at 20°C for 24 hours. After demolding and polishing, N-type thermoelectric particles 6 were obtained. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30; S3: The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 obtained in step S2 are uniformly electroplated with a 7μm nickel layer, and then a 7μm tin layer is plated on them to metallize the surfaces of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6. S4: Place the first copper-clad ceramic substrate 3 on the matching operating table, print lead-free solder, and then place the preset mold (the preset mold includes an upper mold and a lower mold. The upper mold can be flipped up and down to fill P-type thermoelectric particles 5 and N-type thermoelectric particles 6 respectively. The lower mold is used to screen P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to ensure that the two types of thermoelectric particles are not misfilled and to accurately position them on the copper layer of the first copper-clad ceramic substrate 3). Sprinkle one of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 evenly, and vibrate the preset mold to make one of the thermoelectric particles fall accurately into the preset position. S5: Remove the upper layer of the preset mold, remove excess particles, remove the upper mold and flip it to the other side and put it back on the operating table. Put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, and make the other type of thermoelectric particle fall accurately into the preset position. S6: After all the thermoelectric particles are filled, remove the preset mold, and then position the second copper-clad ceramic substrate 4 through the groove on the operating table and cover the top of the thermoelectric particles. S7: Apply solder paste to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, fix the first conductor 71 to the copper layer on the first copper-clad ceramic substrate 3, and fix the second conductor 72 to the copper layer on the second copper-clad ceramic substrate 4. S8: The surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the heating platform and fixed. The heating temperature is raised to 350°C to ensure that the lead-free solder and solder paste melt. After holding at the temperature for a preset time, the surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the water cooling platform for cooling. S9: Place the geopolymer mortar and phase change energy storage microcapsules 9 into a dry disc, spray water into the disc and stir. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, pour the moistened mixture of geopolymer mortar and phase change energy storage microcapsules 9 into a disc granulator. Turn on the disc granulator, set the speed of the disc granulator to 30 r / min and the tilt angle to 45°. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. S10: Spread multiple phase change energy storage aggregate particles evenly, spray water on the surface of the phase change energy storage aggregate particles, cure for 1 day, put the hardened phase change energy storage aggregate particles into a basin for curing, the curing temperature is 20℃ and there is water in the basin, cure for 28 days, and dry the cured energy storage aggregate particles to obtain phase change energy storage aggregate. S11. Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar. The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S13. Add polyvinyl alcohol fiber to the solid mixture with added alkali activator, stir evenly, pour into the second mold, and vibrate to obtain concrete matrix 8. S14: Take phase change energy storage aggregate, concrete matrix 8 (the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of concrete matrix 8 is 24%) and sand and gravel, stir at a high speed for 30 seconds, pause for 90 seconds, and then stir at a high speed for 60 seconds to obtain concrete phase change energy storage microcapsule slurry. S15: Pour the concrete phase change energy storage microcapsule slurry into the first mold, and bring it into contact with the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. After curing for 28 days, a concrete-based phase change thermoelectric power generation device 100A3 is obtained.

[0081] Example 4: Preparation of a concrete-based phase change thermoelectric power generation device 100A4: S1: Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar; The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S2: Add the first semiconductor material to the intermediate material polymer mortar obtained in step S1, transfer it into the electrode mold and cure it at a temperature of 20°C for 24 hours, then demold and polish it to obtain P-type thermoelectric particles 5. The second semiconductor material was added to the intermediate material polymer slurry obtained in step S1, and then transferred into an electrode mold and cured at 20°C for 24 hours. After demolding and polishing, N-type thermoelectric particles 6 were obtained. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30; S3: The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 obtained in step S2 are uniformly electroplated with a 7μm nickel layer, and then a 7μm tin layer is plated on them to metallize the surfaces of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6. S4: Place the first copper-clad ceramic substrate 3 on the matching operating table, print lead-free solder, and then place the preset mold (the preset mold includes an upper mold and a lower mold. The upper mold can be flipped up and down to fill P-type thermoelectric particles 5 and N-type thermoelectric particles 6 respectively. The lower mold is used to screen P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to ensure that the two types of thermoelectric particles are not misfilled and to accurately position them on the copper layer of the first copper-clad ceramic substrate 3). Sprinkle one of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 evenly, and vibrate the preset mold to make one of the thermoelectric particles fall accurately into the preset position. S5: Remove the upper layer of the preset mold, remove excess particles, remove the upper mold and flip it to the other side and put it back on the operating table. Put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, and make the other type of thermoelectric particle fall accurately into the preset position. S6: After all the thermoelectric particles are filled, remove the preset mold, and then position the second copper-clad ceramic substrate 4 through the groove on the operating table and cover the top of the thermoelectric particles. S7: Apply solder paste to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, fix the first conductor 71 to the copper layer on the first copper-clad ceramic substrate 3, and fix the second conductor 72 to the copper layer on the second copper-clad ceramic substrate 4. S8: The surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the heating platform and fixed. The heating temperature is raised to 350°C to ensure that the lead-free solder and solder paste melt. After holding at the temperature for a preset time, the surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the water cooling platform for cooling. S9: Place the geopolymer mortar and phase change energy storage microcapsules 9 into a dry disc, spray water into the disc and stir. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, pour the moistened mixture of geopolymer mortar and phase change energy storage microcapsules 9 into a disc granulator. Turn on the disc granulator, set the speed of the disc granulator to 30 r / min and the tilt angle to 45°. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. S10: Spread multiple phase change energy storage aggregate particles evenly, spray water on the surface of the phase change energy storage aggregate particles, cure for 1 day, put the hardened phase change energy storage aggregate particles into a basin for curing, the curing temperature is 20℃ and there is water in the basin, cure for 28 days, and dry the cured energy storage aggregate particles to obtain phase change energy storage aggregate. S11. Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar. The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S13. Add polyvinyl alcohol fiber to the solid mixture with added alkali activator, stir evenly, pour into the second mold, and vibrate to obtain concrete matrix 8. S14: Take phase change energy storage aggregate, concrete matrix 8 (the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of concrete matrix 8 is 32%) and sand and gravel, stir at a high speed for 30 seconds, pause for 90 seconds, and then stir at a high speed for 60 seconds to obtain concrete phase change energy storage microcapsule slurry. S15: Pour the concrete phase change energy storage microcapsule slurry into the first mold, and bring it into contact with the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. After curing for 28 days, a concrete-based phase change thermoelectric power generation device 100A4 is obtained.

[0082] Example 5: Preparation of a concrete-based phase change thermoelectric power generation device 100A5: S1: Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar; The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S2: Add the first semiconductor material to the intermediate material polymer mortar obtained in step S1, transfer it into the electrode mold and cure it at a temperature of 20°C for 24 hours, then demold and polish it to obtain P-type thermoelectric particles 5. The second semiconductor material was added to the intermediate material polymer slurry obtained in step S1, and then transferred into an electrode mold and cured at 20°C for 24 hours. After demolding and polishing, N-type thermoelectric particles 6 were obtained. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30. The total weight ratio of river sand and cementitious material to the weight ratio of the first semiconductor material is 100:30; S3: The P-type thermoelectric particles 5 and N-type thermoelectric particles 6 obtained in step S2 are uniformly electroplated with a 7μm nickel layer, and then a 7μm tin layer is plated on them to metallize the surfaces of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6. S4: Place the first copper-clad ceramic substrate 3 on the matching operating table, print lead-free solder, and then place the preset mold (the preset mold includes an upper mold and a lower mold. The upper mold can be flipped up and down to fill P-type thermoelectric particles 5 and N-type thermoelectric particles 6 respectively. The lower mold is used to screen P-type thermoelectric particles 5 and N-type thermoelectric particles 6 to ensure that the two types of thermoelectric particles are not misfilled and to accurately position them on the copper layer of the first copper-clad ceramic substrate 3). Sprinkle one of the P-type thermoelectric particles 5 and N-type thermoelectric particles 6 evenly, and vibrate the preset mold to make one of the thermoelectric particles fall accurately into the preset position. S5: Remove the upper layer of the preset mold, remove excess particles, remove the upper mold and flip it to the other side and put it back on the operating table. Put another type of thermoelectric particle, P-type thermoelectric particle 5 or N-type thermoelectric particle 6, into the preset mold, vibrate the preset mold, and make the other type of thermoelectric particle fall accurately into the preset position. S6: After all the thermoelectric particles are filled, remove the preset mold, and then position the second copper-clad ceramic substrate 4 through the groove on the operating table and cover the top of the thermoelectric particles. S7: Apply solder paste to the copper layers of the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4, fix the first conductor 71 to the copper layer on the first copper-clad ceramic substrate 3, and fix the second conductor 72 to the copper layer on the second copper-clad ceramic substrate 4. S8: The surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the heating platform and fixed. The heating temperature is raised to 350°C to ensure that the lead-free solder and solder paste melt. After holding at the temperature for a preset time, the surface-metallized P-type thermoelectric particles 5, surface-metallized N-type thermoelectric particles 6, first copper-clad ceramic substrate 3, second copper-clad ceramic substrate 4, first wire 71 and second wire 72 are placed on the water cooling platform for cooling. S9: Place the geopolymer mortar and phase change energy storage microcapsules 9 into a dry disc, spray water into the disc and stir. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules 9 is moistened, pour the moistened mixture of geopolymer mortar and phase change energy storage microcapsules 9 into a disc granulator. Turn on the disc granulator, set the speed of the disc granulator to 30 r / min and the tilt angle to 45°. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules 9, multiple phase change energy storage aggregate particles are obtained. S10: Spread multiple phase change energy storage aggregate particles evenly, spray water on the surface of the phase change energy storage aggregate particles, cure for 1 day, put the hardened phase change energy storage aggregate particles into a basin for curing, the curing temperature is 20℃ and there is water in the basin, cure for 28 days, and dry the cured energy storage aggregate particles to obtain phase change energy storage aggregate. S11. Mix river sand and cementitious materials at a speed of 400 r / min for 3 min, and finally add alkali activator to obtain geopolymer mortar. The weight ratio of river sand to cementitious material is 1:4. The cementitious material contains 60wt% metakaolin, 20wt% slag, 10wt% fly ash, and 10wt% silica fume. The total weight ratio of river sand and cementitious material to the volume ratio of alkali activator is 100:30. The alkali activator is a mixture of 8mol / L strong alkali solution and water glass solution in a weight ratio of 3:7. S13. Add polyvinyl alcohol fiber to the solid mixture with added alkali activator, stir evenly, pour into the second mold, and vibrate to obtain concrete matrix 8. S14: Take phase change energy storage aggregate, concrete matrix 8 (the ratio of the total mass of all phase change energy storage microcapsules 9 to the mass of concrete matrix 8 is 40%) and sand and gravel, stir at a high speed for 30 seconds, pause for 90 seconds, and then stir at a high speed for 60 seconds to obtain concrete phase change energy storage microcapsule slurry. S15: Pour the concrete phase change energy storage microcapsule slurry into the first mold, and bring it into contact with the first copper-clad ceramic substrate 3 and the second copper-clad ceramic substrate 4. After curing for 28 days, a concrete-based phase change thermoelectric power generation device 100A5 is obtained.

[0083] The five embodiments described above were tested using a CMT5305 microcomputer-controlled universal testing machine with a pressure ≤300KN. The tests were conducted according to the compressive strength test method in GBT 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The compressive strength of concrete-based phase change thermoelectric power generation devices 100 with different phase change energy storage microcapsule 9 contents was tested, and the data are shown in Table 1. In the table, ZT=S2*T*σ / K, where S is the Seebeck coefficient, σ is the electrical conductivity, k is the thermal conductivity, and T is the temperature.

[0084] This experiment used a TC 3000E thermal conductivity meter to determine the thermal conductivity of a 50 mm × 50 mm × 50 mm concrete specimen. The TC3000E thermal conductivity meter employs the transient hot-wire method. This instrument has a wide range of applications and is suitable for measuring the thermal conductivity of different materials and shapes. It has no special requirements for the test sample, as long as the minimum side length is greater than 25 mm. It has advantages such as fast measurement speed, direct result output, and high accuracy.

[0085] Table 1

[0086] As can be seen from the data in Table 1, the concrete-based phase change thermoelectric power generation device 100 in Examples 2-4 exhibits good compressive strength, electrical conductivity, Seebeck coefficient, ZT value, output voltage, and specific heat capacity. This indicates that adding phase change energy storage microcapsules 9 to the concrete matrix 8 can effectively improve the specific heat capacity of the concrete-based phase change thermoelectric power generation device 100, thereby enhancing the thermal energy storage capacity of the device. It also allows the device to have a high latent heat value, indicating that the phase change energy storage microcapsules 9 in the concrete-based phase change thermoelectric power generation device 100 can absorb or release a large amount of thermal energy during the phase change process, effectively improving the utilization rate of thermal energy.

[0087] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0088] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0089] In the description of this invention, "a plurality of" means two or more.

[0090] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0091] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A concrete-based phase change thermoelectric power generation device, characterized in that, include: A thermoelectric element includes a first copper-clad ceramic substrate, a second copper-clad ceramic substrate, P-type thermoelectric particles, N-type thermoelectric particles, a first wire, and a second wire. The P-type and N-type thermoelectric particles are disposed between the first and second copper-clad ceramic substrates. The P-type thermoelectric particles are connected to the copper layer of the first copper-clad ceramic substrate, and the N-type thermoelectric particles are connected to the copper layer of the second copper-clad ceramic substrate. The first wire is connected to the copper layer on the first copper-clad ceramic substrate, and the second wire is connected to the copper layer on the second copper-clad ceramic substrate. A concrete-based phase change energy storage layer is provided on opposite sides of the thermoelectric element in the thickness direction. The concrete-based phase change energy storage layer includes a concrete matrix and a plurality of phase change energy storage microcapsules distributed in the concrete matrix. Each phase change energy storage microcapsule includes a capsule shell and a phase change material disposed within the capsule shell.

2. The concrete-based phase change thermoelectric power generation device according to claim 1, characterized in that, The P-type thermoelectric particles comprise a geopolymer and a first semiconductor material, the first semiconductor material comprising bismuth antimonide and bismuth telluride; the N-type thermoelectric particles comprise a geopolymer and a second semiconductor material, the second semiconductor material comprising bismuth selenide and bismuth telluride. The raw materials for preparing the geopolymer include river sand, cementing materials, and alkali activators.

3. The concrete-based phase change thermoelectric power generation device according to claim 2, characterized in that, In the raw materials for preparing the geopolymer, the mass ratio of river sand to the cementitious material is 1:2-4; In the raw materials for preparing the geopolymer, the total mass ratio of the river sand and the cementitious material to the mass ratio of the alkali activator is 100:20-35; In the P-type thermoelectric particles, the total mass ratio of the river sand and the cementing material to the mass ratio of the first semiconductor material is 100:20-40; In the N-type thermoelectric particles, the total mass ratio of the river sand and the cementing material to the mass ratio of the second semiconductor material is 100:20-40.

4. The concrete-based phase change thermoelectric power generation device according to claim 2, characterized in that, The cementing materials include metakaolin, slag, fly ash, and silica fume; The metakaolin content is 60-90 wt%, the slag content is 5-15 wt%, the fly ash content is 5-10 wt%, and the silica fume content is 5-10 wt%; the specific surface area of ​​the slag is 600-800 m². 2 / kg, residue on a 45μm square-hole sieve <1%, the total content of Al2O3 and SiO2 in the slag ≥50wt%; the fly ash is Grade I calcium ash, the CaO content in the Grade I calcium ash is not less than 10%; the particle size of the silica fume is 0.1-0.3μm, and the specific surface area of ​​the silica fume is 15000-30000. .

5. The concrete-based phase change thermoelectric power generation device according to claim 2, characterized in that, The alkali activator is a mixture of a strong alkali solution and a water glass solution, and the mass ratio of the strong alkali solution to the water glass solution is 3:6-8.

6. The concrete-based phase change thermoelectric power generation device according to claim 1, characterized in that, The concrete matrix includes geopolymer concrete, and the raw materials for preparing the geopolymer concrete include river sand, cementitious materials, alkali activator, and polyvinyl alcohol fiber. In the raw materials for preparing the geopolymer concrete, the mass ratio of the river sand to the cementitious material is 1:2-4; In the raw materials for preparing the geopolymer concrete, the total mass ratio of the river sand and the cementitious material to the mass ratio of the alkali activator is 100:20-35; The cementing materials include metakaolin, slag, fly ash, and silica fume; The metakaolin content is 60-90 wt%, the slag content is 5-15 wt%, the fly ash content is 5-10 wt%, and the silica fume content is 5-10 wt%; the specific surface area of ​​the slag is 600-800 m². 2 / kg, residue on a 45μm square-hole sieve <1%, the total content of Al2O3 and SiO2 in the slag ≥50wt%; the fly ash is Grade I calcium ash, the CaO content in the Grade I calcium ash is not less than 10%; the silica fume has a particle size of 0.1-0.3μm, and the specific surface area of ​​the silica fume is 15000-30000. .

7. The concrete-based phase change thermoelectric power generation device according to claim 1, characterized in that, The capsule shell is made of polymethyl methacrylate, the phase change material includes paraffin, and the particle size range of the phase change energy storage microcapsules is 20μm-30μm. And / or, in a single concrete-based phase change energy storage layer, the ratio of the total mass of all the phase change energy storage microcapsules to the mass of the concrete matrix is ​​16%-32%.

8. The concrete-based phase change thermoelectric power generation device according to claim 1, characterized in that, The density of the phase change energy storage microcapsule is 850. The density of the capsule shell is 1.18 g / cm³. 3 The capsule shell has a melting point of 105°C, a melting temperature of 160°C, a thermal conductivity of 0.25 W / (m·K), a specific heat capacity of 1.7 kJ / (kg·K), and a light transmittance of not less than 92%. And / or, the melting point of the phase change material is in the range of 46°C to 68°C, and the density of the phase change material is 0.8 g / cm³. 3 The phase change material has a thermal conductivity of 0.2 W / (m·K), a specific heat capacity of 2.1 kJ / (kg·K), and a latent heat of 200 kJ / kg.

9. A method for preparing a concrete-based phase change thermoelectric power generation device, characterized in that, The concrete-based phase change thermoelectric power generation device is the concrete-based phase change thermoelectric power generation device according to any one of claims 1-8, and the preparation method of the concrete-based phase change thermoelectric power generation device includes the following steps: Prepare the thermoelectric element and the concrete-based phase change energy storage layer; The concrete-based phase change energy storage layer is installed on opposite sides of the thermoelectric element in the thickness direction; The preparation of the thermoelectric element includes: The P-type thermoelectric particles, the N-type thermoelectric particles, the first copper-clad ceramic substrate, and the second copper-clad ceramic substrate are prepared. The P-type thermoelectric particles are electroplated with a 6-8 μm nickel layer, followed by a 6-8 μm tin layer, to metallize the surface of the P-type thermoelectric particles; the N-type thermoelectric particles are electroplated with a 6-8 μm nickel layer, followed by a 6-8 μm tin layer, to metallize the surface of the N-type thermoelectric particles. The P-type thermoelectric particles and the N-type thermoelectric particles are disposed on the first copper-clad ceramic substrate using a preset mold. The second copper-clad ceramic substrate is disposed on the side of the P-type thermoelectric particles and the N-type thermoelectric particles that is away from the first copper-clad ceramic substrate. The P-type thermoelectric particles, the N-type thermoelectric particles, the first wire are welded to the copper layer of the first copper-clad ceramic substrate, and the second wire is welded to the copper layer of the second copper-clad ceramic substrate to complete the fabrication of the thermoelectric element. The preparation of the concrete-based phase change energy storage layer includes: Preparation of the concrete matrix and the phase change energy storage microcapsules; The surface of the phase change energy storage microcapsule is coated with a polymer mortar to obtain phase change energy storage aggregate; Before the concrete matrix is ​​cured, the phase change energy storage aggregate is distributed in the concrete matrix, the geopolymer mortar forming the concrete matrix is ​​stirred, the phase change energy storage aggregate and sand and gravel with a particle size of 0.1mm~0.25mm are added and stirred to obtain concrete phase change energy storage microcapsule slurry. After stirring the concrete phase change energy storage microcapsule slurry, it is poured into the first mold and cured for 25-30 days to obtain the concrete-based phase change energy storage layer.

10. The method for preparing a concrete-based phase change thermoelectric power generation device according to claim 9, characterized in that, The preparation of the p-type thermoelectric particles includes: A first mixture is obtained by mixing a gelling material, a first semiconductor material, and an alkaline activator. The first mixture is transferred to a thermoelectric particle mold for curing. The cured first mixture is then demolded and polished to obtain the P-type thermoelectric particles. The preparation of the N-type thermoelectric particles includes: The gelling material, the second semiconductor material, and the alkaline activator are mixed to obtain a second mixture; The second mixture is transferred to the thermoelectric particle mold for curing, and the cured second mixture is demolded and polished to obtain the N-type thermoelectric particles; The process of depositing the P-type thermoelectric particles and the N-type thermoelectric particles onto the first copper-clad ceramic substrate using a pre-set mold includes: The first copper-clad ceramic substrate is placed on the operating table, lead-free solder is printed, and then a preset mold is placed on the surface of the first copper-clad ceramic substrate. One of the surface-metallized P-type thermoelectric particles and the surface-metallized N-type thermoelectric particles is placed into the preset mold. The preset mold is vibrated so that one of the surface-metallized P-type thermoelectric particles and the surface-metallized N-type thermoelectric particles falls into a preset position. The preset mold is flipped over, and another type of thermoelectric particle, namely the surface-metallized P-type thermoelectric particle and the surface-metallized N-type thermoelectric particle, is placed into the preset mold. The preset mold is vibrated so that the surface-metallized P-type thermoelectric particle and the other type of thermoelectric particle fall into the preset position. The preset mold includes an upper mold and a lower mold. The upper mold can be flipped to fill the surface-metallized P-type thermoelectric particles and / or the surface-metallized N-type thermoelectric particles respectively. The lower mold is used to screen the surface-metallized P-type thermoelectric particles and / or the surface-metallized N-type thermoelectric particles. The process of soldering the P-type thermoelectric particles, the N-type thermoelectric particles, the first conductor to the copper layer of the first copper-clad ceramic substrate, and the second conductor to the copper layer of the second copper-clad ceramic substrate includes: applying solder paste to the copper layers of the first and second copper-clad ceramic substrates; fixing the first conductor to the copper layer on the first copper-clad ceramic substrate; fixing the second conductor to the copper layer on the second copper-clad ceramic substrate; heating the surface-metallized P-type thermoelectric particles, the surface-metallized N-type thermoelectric particles, the first and second copper-clad ceramic substrates, the first conductor, and the second conductor as a whole, so that the heating temperature reaches the melting temperature of the lead-free solder and the solder paste, holding the temperature and then cooling it down. The preparation of the concrete matrix includes: Weigh out the river sand, cementing material, and alkali activator; The cementitious material is mixed with the river sand to obtain a solid mixture; Add the alkaline activator to the solid mixture and stir; Polyvinyl alcohol fiber is added to the solid mixture containing the alkali activator, stirred evenly, poured into a second mold, and vibrated to obtain the concrete matrix; The phase change energy storage aggregate is prepared by coating the surface of the phase change energy storage microcapsules with polymer mortar, comprising: The geopolymer mortar and the phase change energy storage microcapsules are placed in a dry disc. Water is sprayed into the disc and stirred. After the surface of the mixture of geopolymer mortar and phase change energy storage microcapsules is moistened, the moistened mixture of geopolymer mortar and phase change energy storage microcapsules is poured into a disc granulator. The disc granulator is turned on and water is sprayed into the disc granulator. After the geopolymer mortar coats the surface of all the phase change energy storage microcapsules, multiple phase change energy storage aggregate particles are obtained. Multiple phase change energy storage aggregate particles are laid flat, and water is sprayed on the surface of the phase change energy storage aggregate particles. They are cured for 1-3 days. The hardened phase change energy storage aggregate particles are placed in a basin for curing at a temperature of 18-22°C with water in the basin for 25-30 days. The cured energy storage aggregate particles are then dried to obtain the phase change energy storage aggregate.

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