High-activity long-life calcium-based thermochemical heat storage material and preparation method thereof
By preparing spherical particles and coating them with a shell, the problems of poor thermal conductivity and pore blockage in calcium-based thermochemical thermal storage materials have been solved, resulting in calcium-based thermochemical thermal storage materials with high reactivity and high mechanical strength, suitable for large-scale industrial applications.
Patent Information
- Application Number
- CN202511003368.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-11-04
AI Technical Summary
Calcium-based thermochemical heat storage materials suffer from problems in practical applications, such as poor thermal conductivity of reactor bed particles, slow heat storage and release reaction rate, volume expansion and breakage, and pore blockage, which affect their large-scale industrial application.
Calcium hydroxide powder is mixed with biomass bamboo powder and spherical particles are prepared by a disc granulator. The particles are then coated with a mixture of alumina powder, bamboo powder and glass powder to form a shell. After high-temperature calcination, a highly active and long-life calcium-based thermochemical heat storage material is obtained.
The prepared material possesses high reactivity, high thermal conductivity, and high mechanical strength, which alleviates the pore blockage problem during the energy release process and improves the heat release and mechanical stability of the thermal storage material.
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Figure CN120888283A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of thermochemical heat storage materials, and relates to a calcium-based thermochemical heat storage material with high activity and long service life and a preparation method thereof. BACKGROUND
[0002] Thermochemical heat storage technology is a high-efficiency heat storage method, which uses the reversible endothermic / exothermic reaction process of heat storage materials to realize energy storage and release. The principle of thermochemical heat storage technology is introduced as follows: in the endothermic reaction stage (i.e. the energy storage process), energy is stored by breaking chemical bonds, and the reactants are decomposed into several products, and the obtained products are stored separately; in the exothermic reaction stage (i.e. the energy release process), energy is released by generating chemical bonds, and the products contact to generate exothermic reaction, thereby realizing the release of heat energy.
[0003] Thermochemical heat storage technology is a new type of heat storage technology with high heat storage density and cross-season heat storage advantages. Calcium-based thermochemical heat storage materials have broad application prospects due to their low cost and easy availability, such as CaO / CaCO3 and CaO / Ca(OH)2. However, in practical applications, calcium-based heat storage materials have problems such as poor heat conduction performance of reactor bed particles, slow heat storage and release reaction rate, volume expansion and crushing, which are extremely detrimental to the large-scale industrial application and promotion of calcium-based thermochemical technology. In addition, the gas-solid reaction occurring in the energy release stage of calcium-based thermochemical heat storage materials easily causes pore blockage on the material surface, thereby inhibiting the continuous progress of the energy release reaction.
[0004] In view of the above problems, the current preparation of calcium-based thermochemical energy storage materials mainly adds pore-forming agents to enrich the pore structure of the heat storage materials, improves the reaction activity, adds graphite, silicon carbide and other materials to improve the heat conduction properties of the heat storage materials, and prepares core-shell structure materials to improve the mechanical strength of the heat storage materials. However, the prepared heat storage materials often cannot have all the advantages, and cannot alleviate the pore blockage problem of the heat storage materials in the energy release process while ensuring the effective reaction capacity of the particles. Therefore, it is urgent to develop calcium-based thermochemical energy storage materials with high reaction activity, high heat conduction performance and high mechanical strength. SUMMARY
[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a calcium-based thermochemical heat storage material with high activity and long service life and a preparation method thereof. The calcium-based thermochemical heat storage material prepared by the method has the characteristics of high reaction activity, high heat conduction performance and high mechanical strength.
[0006] To achieve the above purpose, the present application discloses a preparation method of a calcium-based thermochemical heat storage material with high activity and long service life, which comprises:
[0007] 1) taking micron-sized calcium hydroxide powder and biomass bamboo powder;
[0008] 2) mixing calcium hydroxide powder with biomass bamboo powder and drying to obtain mixed powder;
[0009] 3) using a disc granulator to granulate the mixed powder to obtain spherical particles;
[0010] 4) coating a shell on the surface of the spherical particles and drying to obtain embryos;
[0011] 5) calcining the embryos to obtain high-activity long-life calcium-based thermochemical heat storage materials.
[0012] The further improvement of the preparation method of the high-activity long-life calcium-based thermochemical heat storage material according to the application is that:
[0013] Further, in step 1), the particle size of the calcium hydroxide powder and the biomass bamboo powder is 300 mesh.
[0014] Further, in step 1), the mass of the biomass bamboo powder is 10%-50% of the mass of the calcium hydroxide powder.
[0015] Further, in step 2), the drying temperature is 200°C and the drying time is 1 hour.
[0016] Further, the specific process of step 3) is that the mixed powder is rolled and formed into spherical particles with a diameter of 2-3mm using a disc granulator.
[0017] Further, the water spraying solution when using the disc granulator is a 20% concentration, 40°C polyvinylpyrrolidone K30 solution.
[0018] Further, the specific process of step 4) is:
[0019] The spherical particles are added to the disc granulator, and a mixed powder of aluminum oxide powder, bamboo powder and glass powder is coated on the surface of the spherical particles and dried, wherein the particle size of the aluminum oxide powder, the bamboo powder and the glass powder is 300 mesh, and the selected glass powder has a softening temperature of 600°C. After the coating of the spherical particle surface is completed, it is first placed and dried at room temperature for 1 day, and then added to a drying furnace with a temperature of 120°C for further drying for 5 hours.
[0020] Further, by controlling the mixing ratio of the aluminum oxide powder, the bamboo powder and the glass powder, the thermal conductivity, the reaction activity and the mechanical strength of the heat storage particles are adjusted.
[0021] Further, the specific process of step 5) is:
[0022] Put the embryo in the calcining furnace, the furnace temperature is raised to 300 DEG C at 10 DEG C / min and keeps for 1 hour, then the furnace temperature is raised to 550 DEG C at 2 DEG C / min and keeps for 1 hour, finally the furnace temperature is raised to 650 DEG C at 10 DEG C / min and reduced to room temperature at 10 DEG C / min.
[0023] The application discloses a high-activity long-service-life calcium-based thermochemical heat storage material, and a preparation method thereof.
[0024] The application has the following beneficial effects:
[0025] In the high-activity long-service-life calcium-based thermochemical heat storage material and the preparation method thereof, the mixed powder is granulated by using a disc granulator to obtain spherical particles, the surface of the spherical particles is coated with a shell and dried to obtain an embryo, and then the embryo is calcined at high temperature, meanwhile, the porosity of the shell is greater than that of the core, so that the obtained heat storage particle material has the advantages of low cost, high heat absorption / release reaction activity, high thermal conductivity and high mechanical strength.
[0026] Further, the application provides a preparation idea of the gradient-porosity calcium-based thermochemical heat storage material, which can relieve the pore blockage problem of the heat storage material in the energy release process on the basis of ensuring the effective reaction capacity of the heat storage particle, and further improves the heat release amount of the heat storage material. BRIEF DESCRIPTION OF DRAWINGS
[0027] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. The drawings are as follows:
[0028] Figure 1 The method flow chart of the application;
[0029] Figure 2 The structure diagram of the calcium-based thermochemical heat storage material in the application. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some but not all of the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.
[0031] In the description of the present application, it is to be understood that the terms "including", "comprising", "having" and "encompassing" mean that there are additions to the described features, integers, steps, operations, elements, components, and / or groups thereof that are not specifically recited. The terms "comprising" and "including" are to be construed open-ended, in that they allow for the addition of one or more features, integers, steps, operations, elements, components, and / or groups thereof.
[0032] It should also be understood that the terms used in the present specification and claims are not to be interpreted as limiting the present application. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
[0033] It will be further understood that the terms "and / or", "including", "comprising" and "having", as used in the present specification, are used in their broadest sense and can be interpreted to mean "one or more" of the listed items can be present together with any one or more of the listed items or in the absence of any of the listed items. Additionally, the character " / " in the present application generally represents a "or" relationship between the front and rear associated objects.
[0034] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various predetermined ranges, these predetermined ranges should not be limited to these terms. These terms are only used to distinguish one predetermined range from another predetermined range. For example, a first predetermined range can also be referred to as a second predetermined range, and similarly, a second predetermined range can also be referred to as a first predetermined range, without departing from the scope of embodiments of the present application.
[0035] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting." Similarly, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted to mean "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)," depending on the context.
[0036] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.
[0037] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.
[0038] The high-activity long-life calcium-based thermochemical heat storage material described in the present application comprises a core and a shell wrapped outside the core, wherein the porosity of the shell is greater than the porosity of the core.
[0039] The preparation method of the high-activity long-life calcium-based thermochemical heat storage material described in the present application comprises the following steps:
[0040] 1) Take micron-sized calcium hydroxide powder and biomass bamboo powder;
[0041] 2) Mix and dry the calcium hydroxide powder and the biomass bamboo powder to obtain a mixed powder;
[0042] 3) Use a disc granulator to granulate the mixed powder to obtain spherical particles;
[0043] 4) Coat a shell on the surface of the spherical particles and dry to obtain a blank;
[0044] 5) High-temperature calcine the blank to obtain a high-activity long-life calcium-based thermochemical heat storage material.
[0045] In step 1), the particle size of the calcium hydroxide powder and the biomass bamboo powder is 300 mesh, and the mass of the biomass bamboo powder is 10%-50% of the mass of the calcium hydroxide powder. Different proportions of biomass bamboo powder will directly affect the porosity of the finally prepared calcium-based thermochemical heat storage material.
[0046] The drying temperature in step 2) is 200 DEG C, and the drying time is 1 h, so as to facilitate the powder into a ball.
[0047] The specific process of step 3) is as follows:
[0048] The mixed powder is rolled into a ball by using a disc granulator, and spherical particles with a diameter of 2-3 mm are prepared and screened, wherein the spraying solution used in the disc granulator is a 20% concentration, 40 DEG C polyvinylpyrrolidone K30 solution.
[0049] The specific process of step 4) is as follows:
[0050] The spherical particles are added to the disc granulator, and the mixed powder of alumina powder, bamboo powder and glass powder is coated on the surface of the spherical particles and dried, wherein the particle size of the alumina powder, bamboo powder and glass powder is 300 mesh, and the softening temperature of the selected glass powder is 600 DEG C, after the coating of the spherical particle surface is completed, it is first placed at room temperature for 1 day, and then added to the drying furnace at a temperature of 120 DEG C for continuous drying for 5 hours, wherein the thermal conductivity, reactivity and mechanical strength of the heat storage particles are adjusted by controlling the mixing ratio of the alumina powder, bamboo powder and glass powder.
[0051] The specific process of step 5) is as follows:
[0052] The embryo is placed in a calcining furnace, the furnace temperature is increased to 300 DEG C at a rate of 10 DEG C / min and kept for 1 hour, then the furnace temperature is increased to 550 DEG C at a rate of 2 DEG C / min and kept for 1 hour, and finally the furnace temperature is increased to 650 DEG C at a rate of 10 DEG C / min and then decreased to room temperature at a rate of 10 DEG C / min.
[0053] By the present application, a calcium-based thermo-chemical energy storage material with low cost, high reactivity, high thermal conductivity and high mechanical strength can be obtained.
[0054] Example one
[0055] The preparation method of the high-activity long-life calcium-based thermo-chemical heat storage material comprises:
[0056] 1) micron-sized calcium hydroxide powder and biomass bamboo powder are taken;
[0057] 2) the calcium hydroxide powder and the biomass bamboo powder are mixed and dried to obtain a mixed powder;
[0058] 3) the disc granulator is used to granulate the mixed powder to obtain spherical particles;
[0059] 4) a shell is coated on the surface of the spherical particles and dried to obtain an embryo;
[0060] 5) calcining the embryo to obtain the high-activity long-life calcium-based thermo-chemical heat storage material.
[0061] In this embodiment, in step 1), the particle size of the calcium hydroxide powder and the biomass bamboo powder is 300 mesh.
[0062] In this embodiment, in step 1), the mass of the biomass bamboo powder is 10% of the mass of the calcium hydroxide powder.
[0063] In this embodiment, in step 2), the drying temperature is 200℃ and the drying time is 1h.
[0064] In this embodiment, the specific process of step 3) is as follows: the mixed powder is rolled into a spherical particle with a diameter of 2mm using a disc granulator.
[0065] In this embodiment, the spraying solution used in the disc granulator is a 20% concentration, 40℃ polyvinylpyrrolidone K30 solution.
[0066] In this embodiment, the specific process of step 4) is as follows:
[0067] The spherical particle is added to the disc granulator, and the surface of the spherical particle is coated with a mixed powder of aluminum oxide powder, bamboo powder and glass powder, and then dried, wherein the particle size of the aluminum oxide powder, the bamboo powder and the glass powder is 300 mesh, and the softening temperature of the selected glass powder is 600℃. After the surface coating of the spherical particle is completed, it is first placed at room temperature for 1 day, and then added to a drying furnace with a temperature of 120℃ for continuous drying for 5 hours.
[0068] In this embodiment, by controlling the mixing ratio of the aluminum oxide powder, the bamboo powder and the glass powder, the thermal conductivity, the reaction activity and the mechanical strength of the heat storage particle are adjusted.
[0069] In this embodiment, the specific process of step 5) is as follows:
[0070] The embryo is placed in a calcining furnace, and the furnace temperature is increased to 300℃ at a heating rate of 10℃ / min and maintained for 1 hour; then the furnace temperature is increased to 550℃ at a heating rate of 2℃ / min and maintained for 1 hour; finally, the furnace temperature is increased to 650℃ at a heating rate of 10℃ / min and then decreased to room temperature at a cooling rate of 10℃ / min.
[0071] Example Two
[0072] The preparation method of the high-activity long-life calcium-based thermo-chemical heat storage material comprises:
[0073] 1) micron-sized calcium hydroxide powder and biomass bamboo powder are taken;
[0074] 2) mixing calcium hydroxide powder with biomass bamboo powder and drying to obtain mixed powder;
[0075] 3) using a disc granulator to granulate the mixed powder to obtain spherical particles;
[0076] 4) coating a shell on the surface of the spherical particles and drying to obtain a body;
[0077] 5) calcining the body to obtain a high-activity long-life calcium-based thermochemical heat storage material.
[0078] In this embodiment, in step 1), the particle size of both the calcium hydroxide powder and the biomass bamboo powder is 300 mesh.
[0079] In this embodiment, in step 1), the mass of the biomass bamboo powder is 50% of the mass of the calcium hydroxide powder.
[0080] In this embodiment, in step 2), the drying temperature is 200°C and the drying time is 1 hour.
[0081] In this embodiment, the specific process of step 3) is as follows: the mixed powder is rolled and formed into spherical particles with a diameter of 3 mm using a disc granulator.
[0082] In this embodiment, the water spraying solution used in the disc granulator is a 20% concentration, 40°C polyvinylpyrrolidone K30 solution.
[0083] In this embodiment, the specific process of step 4) is as follows:
[0084] The spherical particles are added to the disc granulator, and a mixed powder of aluminum oxide powder, bamboo powder, and glass powder is coated on the surface of the spherical particles and dried, wherein the particle size of the aluminum oxide powder, bamboo powder, and glass powder is 300 mesh, and the selected glass powder has a softening temperature of 600°C. After the coating of the spherical particle surface is completed, it is first placed at room temperature for 1 day of drying, and then added to a drying furnace at a temperature of 120°C for continued drying for 5 hours.
[0085] In this embodiment, by controlling the mixing ratio of the aluminum oxide powder, bamboo powder, and glass powder, the thermal conductivity, reaction activity, and mechanical strength of the heat storage particles are adjusted.
[0086] In this embodiment, the specific process of step 5) is as follows:
[0087] The body is placed in a calcination furnace, the furnace temperature is increased to 300°C at a rate of 10°C / min and held for 1 hour, then the furnace temperature is increased to 550°C at a rate of 2°C / min and held for 1 hour, and finally the furnace temperature is increased to 650°C at a rate of 10°C / min and then decreased to room temperature at a rate of 10°C / min.
[0088] Example Three
[0089] The preparation method of the high-activity long-life calcium-based thermochemical heat storage material according to the present application comprises:
[0090] 1) micron-sized calcium hydroxide powder and biomass bamboo powder are taken;
[0091] 2) the calcium hydroxide powder and the biomass bamboo powder are mixed and dried to obtain mixed powder;
[0092] 3) the mixed powder is granulated using a disc granulator to obtain spherical particles;
[0093] 4) a shell is coated on the surface of the spherical particles and dried to obtain a blank;
[0094] 5) the blank is calcined to obtain the high-activity long-life calcium-based thermochemical heat storage material.
[0095] In this example, in step 1), the particle size of the calcium hydroxide powder and the biomass bamboo powder is 300 mesh.
[0096] In this example, in step 1), the mass of the biomass bamboo powder is 30% of the mass of the calcium hydroxide powder.
[0097] In this example, in step 2), the drying temperature is 200°C and the drying time is 1 hour.
[0098] In this example, the specific process of step 3) is as follows: the mixed powder is rolled and formed into spherical particles using a disc granulator, and spherical particles with a diameter of 2.5 mm are prepared and selected.
[0099] In this example, the water spraying solution used in the disc granulator is a 20% concentration, 40°C polyvinylpyrrolidone K30 solution.
[0100] In this example, the specific process of step 4) is as follows:
[0101] The spherical particles are added to the disc granulator, and a mixture of alumina powder, bamboo powder and glass powder is coated on the surface of the spherical particles and dried, wherein the particle size of the alumina powder, bamboo powder and glass powder is 300 mesh, and the selected glass powder has a softening temperature of 600°C. After the coating of the spherical particle surface is completed, it is first placed and dried at room temperature for 1 day, and then added to a drying furnace with a temperature of 120°C for further drying for 5 hours.
[0102] In this example, by controlling the mixing ratio of the alumina powder, bamboo powder and glass powder, the thermal conductivity, reaction activity and mechanical strength of the heat storage particles are adjusted.
[0103] In this example, the specific process of step 5) is as follows:
[0104] The embryo body is placed in a calcining furnace, the furnace temperature is raised to 300 DEG C at a temperature raising rate of 10 DEG C / min and kept for 1 hour, then the furnace temperature is raised to 550 DEG C at a temperature raising rate of 2 DEG C / min and kept for 1 hour, finally the furnace temperature is raised to 650 DEG C at a temperature raising rate of 10 DEG C / min and reduced to room temperature at a temperature reducing rate of 10 DEG C / min.
[0105] The biomass bamboo powder is used as a pore forming agent, mixed with calcium hydroxide powder, and then spherical granular materials are prepared by using a disc granulator, in the preparation process, a 20% concentration, 40 DEG C polyvinylpyrrolidone K30 solution is used as a spraying liquid, which is conducive to the bonding of the mixed powder into balls.
[0106] The disc granulator forming process is used to coat the mixed powder of aluminum oxide powder, bamboo powder and glass powder on the surface of the spherical particles.
[0107] In the process of forming the heat storage granular material and coating the shell on the particle surface, the porosity of the core and the shell of the heat storage material can be regulated by controlling the proportion of biomass bamboo powder.
[0108] The calcium hydroxide powder, biomass bamboo powder, glass powder and other raw materials used in the application have relatively low prices, and the process flow is simple, which is convenient for large-scale batch production and helps to reduce the investment cost of the calcium-based thermochemical energy storage system.
[0109] It should be noted that the design of the high porosity shell in the application facilitates the entry and exit of reaction gas into the particles, which is conducive to accelerating the heat storage / heat release rate of the heat storage material, and the design of the small porosity core can increase the effective reaction part of the single heat storage particle, which is conducive to improving the energy storage capacity of the energy storage system, so that the gradient porosity thermochemical heat storage material can better balance the heat storage / heat release rate and the energy storage capacity of the thermochemical energy storage system.
[0110] For the endothermic process of the thermal storage material, the reaction area of the surface of the thermal storage particle is large, but the porosity is large and the effective reaction substance is less; on the contrary, the reaction area of the inside of the thermal storage particle is small, but the porosity is small and the effective reaction substance is more, so that the temperature distribution of the thermal chemical thermal storage material with gradient porosity is more uniform in the energy storage stage, the thermal stress is smaller, and the thermal storage material is not easy to break.
[0111] For the exothermic process of the thermal storage material, since the molar volume of the product is approximately twice the molar volume of the reactant, the thermal storage material will obviously expand during the reaction process. At this time, the design of the large-porosity structure of the shell provides a volume expansion space for the thermal storage material, avoiding the problem of material breakage caused by the volume expansion of the thermal storage material.
[0112] For the exothermic process of the thermal storage material, the process is a typical gas-solid chemical reaction process, and the porosity of the thermal storage material becomes smaller and smaller during the reaction process, and the surface of the thermal storage particle first undergoes chemical reaction. When the porosity of the particle surface is blocked, it will be difficult for the reaction gas to diffuse to the inside of the particle to react, resulting in a lower reaction degree of the thermal storage material and less heat release. At this time, the design of the large-porosity structure of the shell can alleviate the problem of porosity blockage of the thermal storage material during the exothermic reaction process, and improve the overall heat release of the thermal storage material.
[0113] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.
[0114] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application should only be limited by the appended claims.
[0115] The above description is only the preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent structure change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical solution of the present application.
Claims
1. A method for preparing a highly active, long-life calcium-based thermochemical heat storage material, characterized in that, include: 1) Take micron-sized calcium hydroxide powder and biomass bamboo powder; 2) Mix calcium hydroxide powder with biomass bamboo powder and dry to obtain a mixed powder; 3) The mixed powder is granulated using a disc granulator to obtain spherical particles; 4) Coat the surface of the spherical particles with a shell and dry them to obtain an embryo; 5) The embryo is calcined to obtain a highly active and long-life calcium-based thermochemical heat storage material.
2. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, In step 1), the particle size of both calcium hydroxide powder and biomass bamboo powder is 300 mesh.
3. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, In step 1), the mass of biomass bamboo powder is 10%-50% of that of calcium hydroxide powder.
4. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, In step 2), the drying temperature is 200℃ and the drying time is 1 hour.
5. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, Step 3) involves using a disc granulator to roll the mixed powder into spherical shapes, and then screening them to obtain spherical particles with a diameter of 2-3 mm.
6. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 5, characterized in that, The spray solution used when using a disc granulator is a 20% concentration, 40°C polyvinylpyrrolidone K30 solution.
7. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, The specific process of step 4) is as follows: Spherical particles are added to a disc granulator, and their surfaces are coated with a mixture of alumina powder, bamboo powder, and glass powder, and then dried. The particle size of the alumina powder, bamboo powder, and glass powder is 300 mesh, and the softening temperature of the selected glass powder is 600℃. After the spherical particles are coated, they are first left to dry at room temperature for 1 day, and then added to a drying oven at 120℃ for 5 hours.
8. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 7, characterized in that, By controlling the mixing ratio of alumina powder, bamboo powder, and glass powder, the thermal conductivity, reactivity, and mechanical strength of the heat storage particles can be adjusted.
9. The method for preparing the highly active, long-life calcium-based thermochemical heat storage material according to claim 1, characterized in that, The specific process of step 5) is as follows: The preform is placed in a calcining furnace, and the furnace temperature is increased to 300℃ at a heating rate of 10℃ / min and held for 1 hour; then the furnace temperature is increased to 550℃ at a heating rate of 2℃ / min and held for 1 hour; finally, the furnace temperature is increased to 650℃ at a heating rate of 10℃ / min and then decreased to room temperature at a cooling rate of 10℃ / min.
10. A highly active, long-life calcium-based thermochemical heat storage material, characterized in that, The material is prepared according to the method for preparing a highly active and long-life calcium-based thermochemical thermal storage material according to any one of claims 1-9, comprising a core and an outer shell surrounding the core, wherein the porosity of the outer shell is greater than that of the core.