High-temperature shaping phase change particle manufacturing device and method

Abstract

The invention relates to the technical field of phase change heat storage packaging, in particular to a high-temperature shaping phase change particle manufacturing device and method.The device comprises a dissolving and stirring mechanism, a material mixing and forming mechanism and a screening mechanism, the dissolving and stirring mechanism is used for evenly dissolving a phase change material in a binder solution to obtain a phase change material solution, and the screening mechanism is used for screening the phase change material solution; uniformly flowing into a mixing and forming mechanism in a filamentous form; the material mixing and forming mechanism is used for uniformly mixing a phase change material solution and a framework supporting material, extruding and cutting the mixture into particles, discharging the particles, enabling the particles to fall into the screening mechanism, and screening out qualified formed phase change particles from the falling particles by the screening mechanism for subsequent sintering and cooling to obtain final shaped phase change particles. The method shows innovative value in the aspects of improving the production efficiency, ensuring the operation safety and widening the material application range, and makes an important contribution to the progress of a material preparation technology in the fields of energy and chemical industry.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change heat storage packaging, and in particular to a device and method for manufacturing high-temperature shaped phase change particles. Background Art

[0002] Thermal energy storage is of vital importance in the contemporary energy industry. With the continuous development of renewable energy, thermal energy storage technology can alleviate the instability of energy supply caused by the fluctuation of renewable energy. In addition, thermal energy storage can improve energy utilization efficiency, balance the load of the power grid, and provide additional energy support during peak demand. According to the heat storage medium, thermal energy storage technology can be divided into sensible heat, latent heat and thermochemical energy storage. Solid-liquid phase change materials have attracted widespread attention as a viable option for latent heat energy storage due to their advantages in isothermal melting / solidification process, energy storage density and capital investment. Inorganic salts, medium and high temperature phase change materials have attracted people's interest due to their low price, but their disadvantages such as low thermal conductivity and easy corrosion limit their application. However, the development of shaped phase change materials is expected to solve these limitations. Shaped phase change materials are composed of phase change materials and skeleton support materials.

[0003] Common preparation techniques for shaped phase change materials include cold pressing and hot sintering, impregnation, and cold sintering. Cold pressing and hot sintering is considered to be one of the most popular techniques for preparing medium and high temperature shaped phase change materials. The preparation process of cold pressing and hot sintering is as follows: First, the phase change material and the skeleton support material are ground to the desired size respectively. Then, they are evenly mixed and poured into the mold, and appropriate pressure is applied to form the sample into a dense structure. Finally, the mixture is sintered at a temperature exceeding the melting point of the phase change material. The liquid phase change material adheres to the skeleton support material by high interfacial energy and capillary force, and solidifies on the surface of the skeleton support material in a solid state, thereby maintaining the stability of the overall shape and preventing the phase change material from leaking. According to different processes, the shaped phase change materials prepared by the impregnation method can be divided into melt impregnation and vacuum impregnation. Melt impregnation is the process of infiltrating the molten phase change material into the porous skeleton support material. The vacuum impregnation method uses vacuum treatment to make it easier for the phase change material to penetrate the skeleton support material. In the above impregnation process, it can be found that melt impregnation may also involve pressure molding of the skeleton support material or a repeatable melt impregnation process, and its preparation process is more complicated, and many studies reported that the impregnation is not thorough enough. Therefore, vacuum assistance is required, but vacuum impregnation requires an additional vacuum system and good equipment sealing. This also increases the process cost and the complexity of the preparation system.

[0004] The cold press sintering method does not require high temperature heating of the phase change material to melt it. In this method, the phase change material and the skeleton support material are mixed, water is sprayed to eliminate the sharp edges between the particles, the sample is introduced into the mold, and the material is formed into a dense structure under medium temperature uniaxial hot pressing. However, this method also requires high pressure and mold heating, which further increases the complexity of manufacturing.

[0005] In summary, the above three production methods all involve processes such as constant pressure molding and crushing, and the operation methods are relatively complicated and are not suitable for large-scale production. Summary of the invention

[0006] In order to solve the above technical problems existing in the prior art, the present invention proposes a high-temperature shaped phase change particle manufacturing device and method suitable for large-scale application and safe operation, and its specific technical scheme is as follows: A high-temperature fixed phase change particle manufacturing device comprises: a dissolving and stirring mechanism, a mixing and forming mechanism and a screening mechanism, wherein the dissolving and stirring mechanism is used to stir a phase change material to make it uniformly dissolved in a binder solution to obtain a phase change material solution, and the dissolving and stirring mechanism comprises: a mixing drum and a porous disk thereunder, wherein the mixing drum comprises an openable bottom cover, and the bottom cover is opened and closed to control the solution in the drum to flow into the porous disk and fall into the mixing and forming mechanism through the porous disk; The mixing and forming mechanism is used to mix the phase change material solution and the skeleton support material uniformly, and then extrude and cut them to discharge them into particles. The mixing and forming mechanism includes: shell one, shell two, shell three, particle board, rotating shaft, and cutting knife group. Shell one, shell two, and shell three are concentrically connected in sequence to form a channel cavity inside, and shell one is provided with an expansion corresponding to the porous disk to receive the phase change material solution and put the skeleton support material; the rotating shaft is arranged in the channel cavity, and its shaft body is provided with a spiral component to stir and propel the mixed material; the particle board is installed at the outlet of the channel cavity at the end of shell three, and the cutting knife group is fixedly installed at the end of the rotating shaft and cooperates with the particle board to cut the mixed material into particles; The screening mechanism is used to screen out qualified phase-change particles from the discharged particles.

[0007] Further, the second and third shells are hollow cylindrical structures, and an openable baffle assembly is provided between the two, and the baffle assembly includes: a baffle cover, a hollow baffle shell, and a plurality of solid baffle sheets, the baffle cover is a circular ring structure and a plurality of slots are provided on its annular side wall, the hollow baffle shell and the solid baffle sheets are both arranged between the rotating shaft and the baffle cover in a fan-shaped structure, wherein the outer diameter of the solid baffle sheet corresponds to the inner diameter of the second shell, and a push handle is provided on each solid baffle sheet, and each push handle is movably provided in the corresponding slot; the hollow baffle shell is provided with an internal space for accommodating five solid baffle sheets; When the baffle assembly is closed, the control push handle moves in the slot, thereby driving the corresponding solid baffle piece to move out of the inner space of the hollow baffle shell, and then arranged and spliced ​​in a staggered manner to form a circular array around the rotating shaft, so that the channel between the second shell and the third shell is closed; When the baffle assembly is opened, the control push handle moves in the card slot, thereby driving the corresponding solid baffle pieces to gather and overlap into the inner space of the hollow baffle shell, so that the passage between the second shell and the third shell is opened.

[0008] Furthermore, the mixing drum also includes: a stirring rod, a top cover, and a cylinder body, wherein the top cover and the bottom cover are respectively arranged at the top and the bottom of the cylinder body, and are tightly matched with the cylinder body to form a stirring chamber; the porous disk is arranged below the bottom cover, and its top disk opening is tightly matched with the bottom cover; the top cover and the bottom cover are both composed of two semicircular plates spliced ​​together, and a handle is welded on the outer periphery of the upper surface of each semicircular plate, wherein the two semicircular plates of the top cover are spliced ​​to form an axial hole at the center, and a sealing member is provided at the junction of the lower surface and the cylinder body, and similarly, the upper and lower surfaces of the two semicircular plates of the bottom cover are respectively provided with corresponding sealing members at the junctions with the cylinder body and the porous disk; the stirring rod main body is provided with a spiral accessory composed of a plurality of fins connected in series, and the handle of the stirring rod passes through the axial hole of the top cover and is connected to the top cover by a bearing; a heating wire is arranged around the outer wall of the cylinder body.

[0009] Furthermore, the expansion opening is directly opposite to the porous disk and is arranged to be circumscribed with the porous disk, or the expansion opening is directly opposite to the porous disk and the minimum length of the expansion opening edge is greater than the outer diameter of the entire dissolving and stirring mechanism above.

[0010] Furthermore, a guide plate is installed on the expansion opening, and the guide plate is used to guide the skeleton support material to enter the expansion opening.

[0011] Furthermore, the second shell includes: two semi-cylindrical thin walls, with docking plates extending from both ends of the thin walls, and the two semi-circular thin walls are assembled into the second shell after being fixedly connected by bolts to the docking plates.

[0012] Furthermore, a connecting hole is provided in the middle of the particle board, and through holes with the same aperture are provided in other areas, and the aperture of the through holes can be designed according to requirements; the end of the rotating shaft passes through the connecting hole.

[0013] Furthermore, the cutting knife group includes: an inner cutting knife and an outer cutting knife, wherein the inner cutting knife and the outer cutting knife are installed on the rotating shaft to rotate with the shaft and are respectively located on both sides of the particle board.

[0014] Furthermore, the spiral assembly includes: a spiral propulsion accessory 1, a spiral fin accessory, and a spiral propulsion accessory 2. The spiral propulsion accessory 1 is located in the shell 1, the spiral fin accessory is located in the shell 2, and the spiral propulsion accessory 2 is located in the shell 3.

[0015] A method for manufacturing high-temperature shaped phase-change particles, comprising: Step 1: Weigh an appropriate amount of binder and mix it with a certain amount of deionized water, introduce it into the stirring chamber of the dissolving and stirring mechanism, and heat the mixture to 70-80°C with the assistance of a heating wire until the binder solution becomes a transparent gel, then add the phase change material into the stirring chamber, and continue heating and stirring until the phase change material is completely dissolved; Step 2: Weigh the skeleton support material and introduce it into the shell one through the guide plate. At the same time, open the bottom cover of the dissolving and stirring mechanism to allow the phase change material solution to flow into the shell one through the porous disk, start the rotating shaft, use the spiral propulsion accessory one to perform preliminary mixing, and push it into the shell two; Step 3: Use the closed baffle assembly to prevent the phase change material and the skeleton support material from entering the shell 3. Under the action of the spiral fin accessories, the two materials are evenly mixed. At this time, the step 1 operation of the next cycle begins; Step 4: The baffle assembly changes from a closed state to an open state, and the step 2 operation of the next cycle is started; the premixed material, i.e. the initially mixed material, enters the outer shell 2 under the push of the spiral propulsion accessory 1, and at the same time, the material currently stirred in the outer shell 2 enters the outer shell 3 under the push of the premixed material and the cooperation of the spiral propulsion accessory 2 for extrusion; the production of phase change particles is completed under the coordinated action of the spiral propulsion accessory 2, the particle board, the inner cutter and the outer cutter; when the material stirred in the current cycle completely enters the outer shell 3, the state of the baffle assembly is changed from an open state to a closed state; Step 5: The cut and formed phase change particles are screened through a screening mechanism, and then placed in a hot air oven to evaporate the moisture inside the particles, while vibrating the screen to prevent the particles from sticking together; Step 6: Place the phase change particles in a muffle furnace for sintering, raise the temperature to the sintering temperature at a predetermined heating rate, and maintain it for 1.5 to 3 hours, then cool it down. After the particles cool to room temperature, the final fixed phase change particles are obtained.

[0016] In the field of energy and chemical industry, the invention has the following innovative features and beneficial effects: 1. Industrial mass production capability: The present invention simplifies the preparation process of the phase-change particles and realizes large-scale production in a single cycle. This innovative process not only improves production efficiency, but also effectively reduces labor costs through integrated mixing and molding design, providing a practical solution for large-scale industrial production.

[0017] 2. Operational flexibility and low-temperature preparation: The preparation process of the present invention demonstrates extremely high operational flexibility and adaptability, and can complete the preparation of materials under relatively low temperature conditions. This is particularly critical for the preparation of high-temperature application materials, while ensuring the safety and controllability of the entire preparation process.

[0018] 3. Wide applicability: The preparation method of the present invention is not limited to specific phase change materials or skeleton support materials, and shows wide applicability. This provides diverse options for material selection in different application scenarios, and enhances the flexibility and practicality of the present invention in diversified industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall external structure of a high-temperature fixed phase change particle manufacturing device of this embodiment; Figure 2 This is a schematic diagram of the overall internal structure of a high-temperature fixed phase change particle manufacturing device of this embodiment; Figure 3 is a schematic structural diagram of the baffle member of this embodiment in a closed state; Figure 4 is a schematic structural diagram of the baffle member of this embodiment in an open state; In the figure, 1-1 is a stirring rod, 1-2 is a top cover, 1-3 is a heating wire, 1-4 is a cylinder, 1-5 is a bottom cover, 1-6 is a porous disk, 2-1 is a guide plate, 2-2 is a shell 1, 2-3 is a shell 2, 2-5 is a docking plate, 3-1 is a shell 3, 3-2 is a particle board, 3-3 is an outer cutter, 3-4 is an inner cutter, 4-1 is a screen, and 4-2 is a base; 5 is a rotating shaft, 5-1 is a spiral propulsion accessory 1, 5-2 is a spiral fin accessory, 5-3 is a spiral propulsion accessory 2, 3-3 is an external cutting knife, and 3-4 is an internal cutting knife; 2-4 is the baffle assembly, 2-41 is the baffle cover, 2-42 is the hollow baffle shell, 2-43 is the baffle piece one, 2-44 is the baffle piece two, 2-45 is the baffle piece three, 2-46 is the baffle piece four, 2-47 is the baffle piece five, 2-48 is the slot, and 2-49 is the slot plug. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and technical effect of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 and Figure 2 As shown, a high-temperature fixed phase change particle manufacturing device according to an embodiment of the present invention includes: a dissolving and stirring mechanism, a mixing and forming mechanism, and a screening mechanism. The dissolving and stirring mechanism is used to uniformly dissolve the phase change material in the binder solution to obtain a phase change material solution, and uniformly flow it into the mixing and forming mechanism in a filamentous form; the mixing and forming mechanism is used to uniformly mix the phase change material solution and the skeleton support material, and then extrude and cut them into particles for discharge, and drop them into the screening mechanism, and the screening mechanism screens out qualified formed phase change particles from the fallen particles, which are used for subsequent sintering and cooling to obtain the final fixed phase change particles.

[0022] Specifically, the dissolving and stirring mechanism is located above the mixing and forming mechanism. Figure 2 The dissolving and stirring mechanism includes: a stirring rod 1-1, a top cover 1-2, a cylinder 1-4, a bottom cover 1-5, and a porous disk 1-6.

[0023] The top cover 1-2 and the bottom cover 1-5 are respectively arranged at the top and bottom of the cylinder 1-4, and are closely matched with the cylinder 1-4 to form a stirring chamber. The porous disk 1-6 is arranged below the bottom cover 1-5, and its top plate mouth is closely matched with the bottom cover 1-5. Its bottom panel adopts a porous plate design, which can make the inflowing liquid flow out evenly in a filamentary form, so as to facilitate the subsequent mixing process to be more uniform. The top cover 1-2 and the bottom cover 1-5 are both composed of two semicircular plates, and each semicircular plate is welded with a handle for easy operation at the outer periphery of the upper surface, so as to quickly disassemble, facilitate the placement of materials and the smooth discharge of liquid in the cavity. Among them, the two semicircular plates of the top cover 1-2 are formed with an axial hole at the center after being spliced, and a seal is provided at the junction of its lower surface with the cylinder 1-4, which ensures the sealing during the stirring process to prevent liquid splashing or overflowing; similarly, the upper and lower surfaces of the two semicircular plates of the bottom cover 1-5 are also provided with corresponding seals at the junction with the cylinder 1-4 and the porous disk 1-6. The stirring rod 1-1 is located inside the cylinder 1-4, and a spiral accessory consisting of a plurality of fins connected in series is provided on the main body. The structure of the spiral accessory is used to achieve sufficient stirring of the liquid in the cavity and ensure the uniform distribution of the phase change material during the preparation process; the handle of the stirring rod 1-1 is located outside the cylinder 1-4, and a bearing connector can be used between the shaft hole passing through the top cover 1-2 and the top cover 1-2 to achieve stable support and rotation of the stirring rod 1-1 on the top cover 1-2. A heating wire 1-3 is arranged around the outer wall of the cylinder 1-4, and the heating wire 1-3 is used to accurately control the temperature of the stirring liquid in the cavity to meet the heat treatment requirements of different phase change materials.

[0024] Continue to refer Figure 2 The mixing and forming mechanism includes: a guide plate 2-1, a shell 1 2-2, a shell 2-3, a shell 3-1, a particle board 3-2, an outer cutter 3-3, an inner cutter 3-4, and a rotating shaft 5.

[0025] The shell 1 2-2, shell 2-3 and shell 3-1 are all hollow cylindrical structures and are concentrically connected in sequence to form a channel cavity for mixing and transporting materials, and the rotating shaft 5 passes through the cavity from shell 1 2-2 to shell 3 3-1.

[0026] The side wall of the shell 1-2 is provided with an upwardly extending flare, which is directly opposite to the porous disk 1-6 and is arranged externally with the porous disk 1-6, or the flare is directly opposite to the porous disk 1-6 and the minimum length of the flare edge is greater than the outer diameter of the entire dissolving and stirring mechanism above. The guide plate 2-1 is connected to the flare to facilitate the skeleton support material to flow smoothly from the top of the guide plate 2-1 into the shell 1-2, ensuring the effective guidance and continuous supply of the material.

[0027] The second shell 2-3 is a detachable assembly structure, specifically comprising: two semi-cylindrical thin walls, with docking plates 2-5 extending from both ends of the thin walls, and the two semi-circular thin walls can be assembled into the second shell 2-3 by bolting the docking plates 2-5 together. This structure allows the second shell 2-3 to be easily disassembled, which is convenient for cleaning and maintenance.

[0028] The particle plate 3-2 is installed at the end outlet of the shell 3-1. A connecting hole for installing the rotating shaft 5 is reserved in the middle of the particle plate 3-2, while other areas are provided with through holes with the same aperture. The aperture of the through holes can be designed according to requirements, allowing the production of phase change particles of different sizes.

[0029] The inner cutter 3-4 and the outer cutter 3-3 are mounted on the rotating shaft 5 and are located on the inner and outer sides of the particle board 3-2, respectively. The inner cutter 3-4 is used to perform preliminary cutting on the phase change material before it enters the particle board 3-2, so as to facilitate the material to pass through the through hole of the particle board 3-2 smoothly and reduce the risk of blockage caused by large pieces of material. The outer cutter 3-3 performs final finishing on the phase change material passing through the through hole of the particle board 3-2, ensuring that the shape and size of the particles accurately meet the predetermined requirements, thereby improving the regularity and consistency of the particles.

[0030] The shaft body of the rotating shaft 5 located in the cavity is divided into three parts, wherein the shaft bodies in the shell 1 2-2 and the shell 3 3-1 are respectively provided with a spiral propulsion accessory 1 5-1 and a spiral propulsion accessory 2 5-3 of the same structure, and the shaft body in the shell 2-3 is provided with a plurality of spiral fin accessories 5-2. The mixed material is sequentially stirred and propulsed by the spiral propulsion accessory 1 5-1, further uniformly stirred by the spiral fin accessory 5-2, and pushed and extruded by the spiral propulsion accessory 2 5-3 in the cavity, and finally cut out from the particle board 3-2 by the cutter.

[0031] In one embodiment, a baffle assembly 2-4 is provided between the second housing 2-3 and the third housing 3-1, which can control the opening and closing of the cavity channel, thereby adjusting the uniformity of the mixing and controlling the progress of particle preparation. Specifically, Figure 3 and Figure 4As shown, the baffle assembly 2-4 includes: a baffle cover 2-41, a hollow baffle shell 2-42 and five solid baffle plates. The baffle cover 2-41 is a circular ring structure, and five slots are arranged on its annular side wall. Combined with the through-setting of the rotating shaft 5, the hollow baffle shell 2-42 and the solid baffle plates are arranged between the rotating shaft 5 and the baffle cover 2-41 in a fan-shaped structure, wherein the outer diameter of the solid baffle plate corresponds to the inner diameter of the outer shell 2-3, and a push handle is provided on each solid baffle plate. The hollow baffle shell 2-42 is provided with an internal space specifically for accommodating five solid baffle plates. During the mixing operation, these five solid baffle plates can be flexibly rotated under the action of the small push handle, and are moved out of the hollow baffle shell 2-42, and are spliced ​​in a staggered manner to form a new circular array, so that the baffle assembly 2-4 is in a closed state, and the channel is closed, thereby preventing the mixed material from mistakenly entering the outer shell 3-1. The staggered order of the five solid baffles from inside to outside are: baffle one 2-43, baffle two 2-44, baffle three 2-45, baffle four 2-46, baffle five 2-47, and each baffle is arranged in a close fit. When the equipment is ready to perform the extrusion operation, the five baffles can be rotated and closed by pushing the push handle to be stored in the internal space of the hollow baffle shell 2-42, providing the necessary space for the mixture to pass smoothly. At this time, the baffle assembly 2-4 is in an open state. In order to prevent the mixture from being exposed through the slot 2-48 during the extrusion process, a corresponding slot plug 2-49 can be set to plug the slot 2-48 to prevent material leakage.

[0032] Following the reference Figure 1 The screening mechanism is designed to achieve accurate screening of qualified particles, including: a screen 4-1 and a base 4-2. The screen 4-1 is used to screen out unformed powdered phase change particles, while the base 4-2 collects these unqualified particles for subsequent secondary utilization. The formed particles remain on the screen 4-1, ensuring the quality of the final product.

[0033] In combination with the above device, an embodiment of the present invention provides a method for manufacturing high-temperature shaped phase change particles, comprising the following steps: Step 1: Accurately weigh an appropriate amount of binder, such as sodium carboxymethyl cellulose, and mix it with a certain amount of deionized water, and introduce it into the stirring chamber of the dissolving and stirring mechanism. With the assistance of the heating wires 1-3, the mixture is heated to 70-80°C until the binder solution becomes a transparent gel. Subsequently, a certain amount of phase change material, such as nitrate or carbonate, is added to the stirring chamber, and heating and stirring are continued until the salt particles are completely dissolved.

[0034] Step 2: Weigh a certain amount of skeleton support material, such as steel slag, dolomite, fly ash or diatomaceous earth, and introduce it into the shell 1-2 through the guide plate 2-1. At the same time, open the bottom cover 1-5 of the dissolving and stirring mechanism to allow the phase change material solution to flow into the shell 1-2 through the porous disk 1-6. Start the rotating shaft 5, use the spiral propulsion accessory 1-5-1 to achieve preliminary mixing, and push it into the shell 2-3.

[0035] Step 3: Use the closed baffle assembly 2-4 to prevent the phase change material and the skeleton support material from entering the housing 3-1. Under the action of the spiral fin accessory 5-2, the two materials are evenly mixed. At this point, the next cycle of step 1 can be started.

[0036] Step 4: The baffle assembly 2-4 enters the open state from the closed state, and the step 2 operation of the next cycle is started. The premixed material, i.e. the initially mixed material, enters the outer shell 2-3 under the action of the spiral propulsion accessory 1 5-1. At the same time, the material that is currently stirred in the outer shell 2-3 enters the outer shell 3 3-1 under the push of the premixed material and the cooperation of the spiral propulsion accessory 2 5-3 for extrusion. Under the synergistic action of the spiral propulsion accessory 2 5-3, the particle board 3-2, the inner cutter 3-4 and the outer cutter 3-3, the production of phase change particles is completed. When the material stirred in the current cycle completely enters the outer shell 3 3-1, the state of the baffle assembly 2-4 is changed from the open state to the closed state.

[0037] Step 5: The cut and formed phase change particles are screened through a screening mechanism and then placed in a hot air oven to evaporate the moisture inside the particles. To prevent the particles from sticking together after drying, a vibrating screen is required to avoid sticking.

[0038] Step 6: Place the phase change particles in a muffle furnace for sintering, raise the temperature to the sintering temperature at a predetermined heating rate, and maintain it for 1.5 to 3 hours, and then cool it at an appropriate cooling rate. After the particles are cooled to room temperature, the final shaped phase change particles are obtained, and the preparation of shaped phase change particles suitable for high temperature applications is completed.

[0039] The concentration of the binder solution in step 1 is determined according to the properties of the binder, for example, the concentration of sodium carboxymethyl cellulose is controlled at 2-3%. The mass ratio of the phase change material to the skeleton support material is 1.0-4.0:1. The amount of water added is related to the density of the skeleton support material, and the mass ratio of water to the skeleton support material is 1.9-13.0:1.

[0040] In step six, the set sintering temperature should be higher than the phase change temperature of the phase change material and can be adjusted according to the maximum operating temperature required in the actual application to ensure the performance stability and reliability of the phase change particles in high-temperature heat storage applications.

[0041] In summary, the present invention has demonstrated its innovative value in improving production efficiency, ensuring operational safety, and broadening the scope of material application, and has made important contributions to the advancement of material preparation technology in the energy and chemical industries.

[0042] The above is only a preferred implementation case of the present invention and does not limit the present invention in any form. Although the implementation process of the present invention is described in detail above, for those familiar with the art, they can still modify the technical solutions recorded in the above examples, or replace some of the technical features therein with equivalents. All modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature shaped phase change particle manufacturing device, comprising: A dissolving and stirring mechanism, a mixing and forming mechanism and a screening mechanism, characterized in that the dissolving and stirring mechanism is used to stir the phase change material so that it is uniformly dissolved in the binder solution to obtain a phase change material solution, the dissolving and stirring mechanism comprises: a mixing drum and a porous plate (1-6) below the mixing drum, the mixing drum comprises an openable and closable bottom cover (1-5), and the bottom cover (1-5) is opened and closed to control the solution in the drum to flow into the porous plate (1-6), and then fall into the mixing and forming mechanism through the porous plate (1-6); The mixing and forming mechanism is used for mixing the phase change material solution and the skeleton support material uniformly, and then extruding and cutting them to discharge them in the form of particles. The mixing and forming mechanism comprises: a shell one (2-2), a shell two (2-3), a shell three (3-1), a particle board (3-2), a rotating shaft (5), and a cutting knife group. The shell one (2-2), the shell two (2-3), and the shell three (3-1) are sequentially connected concentrically to form a channel cavity inside, and the shell one (2-2) is provided with an expansion corresponding to the porous disk (1-6) for receiving the phase change material solution and placing the skeleton support material; the rotating shaft (5) is arranged through the channel cavity, and its shaft body is provided with a spiral component for stirring and pushing the mixed material; the particle board (3-2) is installed at the outlet of the channel cavity located at the end of the shell three (3-1), and the cutting knife group is fixedly installed at the end of the rotating shaft (5) and cooperates with the particle board (3-2) to cut the mixed material into particles; The screening mechanism is used to screen out qualified phase-change particles from the discharged particles.

2. The device according to claim 1, characterized in that The second shell (2-3) and the third shell (3-1) are hollow cylindrical structures, and an openable baffle assembly (2-4) is arranged between the two. The baffle assembly (2-4) comprises: a baffle cover (2-41), a hollow baffle shell (2-42), and a plurality of solid baffle plates. The baffle cover (2-41) is a circular ring structure and a plurality of slots (2-48) are arranged on its annular side wall. The hollow baffle shell (2-42) and the solid baffle plates are arranged between the rotating shaft (5) and the baffle cover (2-41) in a fan-shaped structure, wherein the outer diameter of the solid baffle plates corresponds to the inner diameter of the second shell (2-3), and each solid baffle plate is provided with a push handle, and each push handle is movably arranged in a corresponding slot (2-48); the hollow baffle shell (2-42) is provided with an internal space for accommodating five solid baffle plates; When the baffle assembly (2-4) is closed, the push handle is controlled to move in the slot (2-48), thereby driving the corresponding solid baffle plate to move out of the internal space of the hollow baffle shell (2-42), and then arranged and spliced ​​in a staggered manner to form a circular array around the rotating shaft (5), so that the channel between the second shell (2-3) and the third shell (3-1) is closed; When the baffle assembly (2-4) is opened, the control push handle moves in the slot, thereby driving the corresponding solid baffle sheet to be gathered and overlapped in the inner space of the hollow baffle shell (2-42), so that the passage between the second shell (2-3) and the third shell (3-1) is opened.

3. The device according to claim 1, characterized in that The mixing drum further comprises: a mixing rod (1-1), a top cover (1-2), and a drum body (1-4); the top cover (1-2) and the bottom cover (1-5) are respectively arranged at the top and the bottom of the drum body (1-4), and are closely matched with the drum body (1-4) to form a mixing chamber; the porous disk (1-6) is arranged below the bottom cover (1-5), and the top opening of the porous disk is closely matched with the bottom cover (1-5); the top cover (1-2) and the bottom cover (1-5) are both composed of two semicircular plates, and a handle is welded on the outer periphery of the upper surface of each semicircular plate, wherein the top cover (1-2) is provided with a handle. After the two semicircular plates are assembled, an axial hole is formed at the center, and a seal is provided at the junction of the lower surface and the cylinder (1-4). Similarly, corresponding seals are also provided at the junctions of the upper and lower surfaces of the two semicircular plates of the bottom cover (1-5) with the cylinder (1-4) and the porous disk (1-6). The main body of the stirring rod (1-1) is provided with a spiral accessory composed of a plurality of fins connected in series, and the handle of the stirring rod (1-1) passes through the axial hole of the top cover (1-2) and is connected to the top cover (1-2) by a bearing. A heating wire (1-3) is arranged around the outer wall of the cylinder (1-4).

4. The device according to claim 1, characterized in that The expanded opening is directly opposite to the porous disk (1-6) and is arranged to be circumscribed with the porous disk (1-6), or the expanded opening is directly opposite to the porous disk (1-6) and the minimum length of the expanded opening edge is greater than the outer diameter of the entire dissolving and stirring mechanism above.

5. The device according to claim 1, characterized in that A guide plate (2-1) is also installed on the expanded opening, and the guide plate (2-1) is used to guide the skeleton support material to enter the expanded opening.

6. The device according to claim 1, characterized in that The second shell (2-3) comprises: two semi-cylindrical thin walls, with butt joint plates (2-5) extending from both ends of the thin walls, and the two semi-circular thin walls are assembled into the second shell (2-3) after being fixedly connected by bolts to the butt joint plates (2-5).

7. The device according to claim 1, characterized in that A connecting hole is provided in the middle of the particle board (3-2), while through holes with the same aperture are provided in other areas; the end of the rotating shaft (5) passes through the connecting hole.

8. The device according to claim 1, characterized in that The cutting knife group comprises an inner cutting knife (3-4) and an outer cutting knife (3-3), wherein the inner cutting knife (3-4) and the outer cutting knife (3-3) are mounted on a rotating shaft (5) to rotate with the shaft and are respectively located on both sides of the particle board (3-2).

9. The device according to claim 1, characterized in that The spiral assembly comprises: a spiral propulsion accessory 1 (5-1), a spiral fin accessory (5-2), and a spiral propulsion accessory 2 (5-3); the spiral propulsion accessory 1 (5-1) is located in the shell 1 (2-2), the spiral fin accessory (5-2) is located in the shell 2 (2-3), and the spiral propulsion accessory 2 (5-3) is located in the shell 3 (3-1).

10. A method for producing phase-fixed phase-change particles using the high-temperature fixed phase-change particle production device according to any one of claims 1 to 9, characterized in that: include: Step 1: Weigh an appropriate amount of binder, mix it with a certain amount of deionized water, and introduce it into the stirring chamber of the dissolving and stirring mechanism. With the assistance of the heating wire (1-3), heat the mixture to 70-80°C until the binder solution becomes a transparent colloid. Then, add the phase change material into the stirring chamber, and continue heating and stirring until the phase change material is completely dissolved. Step 2: Weigh the skeleton support material and introduce it into the shell one (2-2) through the guide plate (2-1). At the same time, open the bottom cover (1-5) of the dissolving and stirring mechanism to allow the phase change material solution to flow into the shell one (2-2) through the porous disk (1-6), start the rotating shaft (5), use the spiral propulsion accessory one (5-1) to perform preliminary mixing, and push it into the shell two (2-3); Step three: using the baffle assembly (2-4) in a closed state to prevent the phase change material and the skeleton support material from entering the shell three (3-1), and under the action of the spiral fin accessory (5-2), the two materials are evenly mixed, and at this time, the operation of step one of the next cycle begins; Step 4: the baffle assembly (2-4) changes from a closed state to an open state, and the step 2 operation of the next cycle is started; the premixed material, i.e. the initially mixed material, enters the outer shell 2 (2-3) under the push of the spiral propulsion accessory 1 (5-1), and at the same time, the material currently stirred in the outer shell 2 (2-3) enters the outer shell 3 (3-1) under the push of the premixed material and the cooperation of the spiral propulsion accessory 2 (5-3) to perform the extrusion work; the phase change particles are produced under the coordinated action of the spiral propulsion accessory 2 (5-3), the particle board (3-2), the inner cutter (3-4) and the outer cutter (3-3); when the material stirred in the current cycle completely enters the outer shell 3 (3-1), the state of the baffle assembly (2-4) is changed from an open state to a closed state; Step 5: The cut and formed phase change particles are screened through a screening mechanism, and then placed in a hot air oven to evaporate the moisture inside the particles, while vibrating the screen to prevent the particles from sticking together; Step 6: Place the phase change particles in a muffle furnace for sintering, raise the temperature to the sintering temperature at a predetermined heating rate, and maintain it for 1.5 to 3 hours, then cool it down. After the particles cool to room temperature, the final fixed phase change particles are obtained.

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