A directional heat releasing phase change molten salt heat storage device
Patent Information
- Application Number
- CN202521897210.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-04
AI Technical Summary
[0002]在相变熔盐储罐作为直接取热单元使用的许多应用场景中均为单向取热，但是由于现有相变熔盐储罐的热量交换方向是不受限制的且常规的隔热设计方案对阻断无效方向传热的效果不佳，如此导致现有相变熔盐储罐在工作时间较长且工作温度较高的时候缺点尤为明显：无效热量损失较多，储热总能量的有效利用率低，且会使得储罐周围温度高以造成产品整体设计困难，具有改进的空间
[0010]Compared with existing technologies, this utility model has a simple and reasonable structure. By constructing at least one highly efficient heat insulation layer on the outside of the metal container, leaving only the heat-extracting surface for heat release, the heat insulation layer can effectively block heat conduction, heat convection, and heat radiation from the non-heat-extracting surface. This allows the metal container to release heat only through the heat-extracting surface, thereby reducing the loss of ineffective heat energy and increasing the effective energy storage utilization rate of the thermal storage device by more than 10%. It also increases the effective working time of the thermal storage device by more than 10%. At the same time, it effectively reduces the external temperature of the metal container, which facilitates the overall design of the product.
Smart Images
Figure CN224666743U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of molten salt phase change thermal storage technology, and in particular to a directional heat release phase change molten salt thermal storage device. Background Technology
[0002] In many applications where phase change molten salt tanks are used as direct heat extraction units, heat extraction is unidirectional. However, since the heat exchange direction of existing phase change molten salt tanks is unrestricted and conventional insulation designs are not effective in blocking heat transfer in ineffective directions, the disadvantages of existing phase change molten salt tanks are particularly obvious when the working time is long and the working temperature is high: there is a lot of ineffective heat loss, the effective utilization rate of the total stored heat energy is low, and the temperature around the tank is high, which makes the overall product design difficult and there is room for improvement. Utility Model Content
[0003] This invention aims to overcome the deficiencies in the prior art by providing a directional heat release phase change molten salt thermal storage device. It utilizes at least one highly efficient heat insulation layer constructed on the exterior of a metal container, leaving only the heat-extracting surface for heat release. This at least one insulation layer effectively blocks heat conduction, convection, and radiation from the non-heat-extracting surface, allowing the metal container to release heat only through the heat-extracting surface. This reduces the loss of ineffective heat energy and improves energy storage utilization. Simultaneously, it effectively lowers the external temperature of the metal container, facilitating the overall product design.
[0004] To achieve the above objectives, this utility model provides a directional exothermic phase change molten salt thermal storage device, including a metal container and a phase change molten salt sealed and filled in the metal container; The outer surface of the metal container includes a heat-receiving surface and a non-heat-receiving surface. The metal container is provided with at least one heat insulation layer corresponding to the external structure of the non-heat-receiving surface, and the at least one heat insulation layer includes a vacuum layer.
[0005] The further configuration includes at least one of the insulation layers, which also includes a sealed air barrier layer.
[0006] The further configuration is as follows: the air barrier layer is filled with a heat insulation material, wherein the heat insulation material is fiberglass and / or aerogel.
[0007] Further configured such that the vacuum level of the vacuum layer is ≤10 -3 Pa.
[0008] A further configuration is provided: a reflective layer is provided on the inner wall of the vacuum layer.
[0009] The further configuration is as follows: the heat-receiving surface of the metal container is a recessed platform structure.
[0010] Compared with existing technologies, this utility model has a simple and reasonable structure. By constructing at least one highly efficient heat insulation layer on the outside of the metal container, leaving only the heat-extracting surface for heat release, the heat insulation layer can effectively block heat conduction, heat convection, and heat radiation from the non-heat-extracting surface. This allows the metal container to release heat only through the heat-extracting surface, thereby reducing the loss of ineffective heat energy and increasing the effective energy storage utilization rate of the thermal storage device by more than 10%. It also increases the effective working time of the thermal storage device by more than 10%. At the same time, it effectively reduces the external temperature of the metal container, which facilitates the overall design of the product. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the implementation structure of a directional exothermic phase change molten salt thermal storage device according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the implementation structure of a phase change molten salt thermal storage device. Figure 2 .
[0012] The following reference numerals are marked on the accompanying drawings: 1. Metal container; 11. Heating surface; 12. Settlement platform; 13. Non-heating surface; 14. Compensation space; 2. Phase change molten salt; 3. Heating element; 4. Vacuum layer; 41. Reflective layer; 5. Air barrier layer; 51. Insulation material. Detailed Implementation
[0013] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.
[0014] This utility model discloses a directional exothermic phase change molten salt heat storage device, such as... Figure 1 and Figure 2 As shown, it includes a metal container 1, a phase change molten salt 2 sealed and filled in the metal container 1, and a heating tube 3 for heating the phase change molten salt 2 to absorb heat and store energy. The heating tube 3 can be set on the outer wall of the metal container 1 or inside the metal container 1 as needed.
[0015] like Figure 1 and Figure 2As shown, the outer surface of the metal container 1 is divided into a heat-extracting surface 11 and a non-heat-extracting surface 13 according to whether it needs to release heat. The metal container 1 is provided with at least one heat insulation layer corresponding to the non-heat-extracting surface 13. The at least one heat insulation layer includes a vacuum layer 4. In this way, the heat conduction, heat convection and heat radiation of the non-heat-extracting surface 13 can be effectively blocked by the at least one heat insulation layer with vacuum layer 4, so that the metal container 1 can only release heat in a directional manner through the heat-extracting surface 11, thereby greatly reducing the loss of ineffective heat energy, improving the effective energy storage utilization rate of the heat storage device, and extending the effective heat extraction time of the heat storage device.
[0016] like Figure 1 and Figure 2 As shown, the heat-receiving surface 11 of the metal container 1 is preferably a recessed platform 12 structure. Thus, a compensation space 14 suitable for the volume change of the phase change molten salt 2 is formed on the outer periphery of the platform 12 structure inside the metal container 1. The minimum immersion depth of the platform 12 is obtained by calculating according to the solidification shrinkage ratio of the phase change molten salt 2, ensuring that the platform 12 is always immersed in the phase change molten salt 2 during the phase change process. This ensures that there is always an efficient direct heat transfer path between the phase change molten salt 2 and the heat-receiving surface 11, so that the heat-receiving surface 11 can continuously and stably release heat efficiently.
[0017] Example 1
[0018] like Figure 1 As shown, the metal container 1 has only one heat insulation layer on the outside of the non-heat-extracting surface 13, namely a single-layer vacuum layer 4. The vacuum layer 4 is preferably made of 304 stainless steel through a stamping, welding, and vacuum sealing process, and its vacuum degree is preferably ≤10. -3 Pa, to ensure excellent thermal insulation performance, the thermal storage device with a single-layer vacuum layer 4 structure in Embodiment 1 is suitable for scenarios where the heat extraction temperature is less than 300°C; in order to reduce heat loss from thermal radiation, it is preferable that a reflective layer 41 for heat reflection is provided on the inner wall of the vacuum layer 4, which can be a copper plating layer formed on the inner wall of the vacuum layer 4 by a copper plating process.
[0019] Example 2
[0020] like Figure 2As shown, compared with the single-layer vacuum layer 4 insulation structure used in Embodiment 1, Embodiment 2 forms two insulation layers on the outside of the non-heat-extracting surface 13, namely the air barrier layer 5 and the vacuum layer 4 located on the inner side. The heat storage device with vacuum layer 4 and air barrier layer 5 in Embodiment 2 is suitable for scenarios with heat extraction temperature greater than 300°C. The structure of vacuum layer 4 in Embodiment 2 is basically the same as that in Embodiment 1. The air barrier layer 5 is preferably a sealed cavity structure that can block air convection. The air barrier layer 5 with such a closed cavity structure can further reduce heat transfer and heat convection. To further enhance the insulation effect of air barrier layer 5, it is preferable that the air barrier layer 5 is filled with insulation material 51, which is preferably glass fiber and / or aerogel.
[0021] Example 3
[0022] In other specific embodiments, the thermal storage device can also be adapted to higher heat extraction temperature scenarios by constructing more insulation layers outside the metal container 1, including at least one vacuum layer 4, at least one air barrier layer 5, and other insulation structures, which are not specifically limited here.
[0023] Compared with existing technologies, this utility model has a simple and reasonable structure. By constructing at least one highly efficient heat insulation layer on the outside of the metal container, leaving only the heat-extracting surface for heat release, the heat insulation layer can effectively block heat conduction, heat convection, and heat radiation from the non-heat-extracting surface. This allows the metal container to release heat only through the heat-extracting surface, thereby reducing the loss of ineffective heat energy and increasing the effective energy storage utilization rate of the thermal storage device by more than 10%. It also increases the effective working time of the thermal storage device by more than 10%. At the same time, it effectively reduces the external temperature of the metal container, which facilitates the overall design of the product.
[0024] The above-disclosed embodiments are merely examples of the present utility model. However, the present utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.
Claims
1. A directional exothermic phase change molten salt thermal storage device, comprising a metal container and a phase change molten salt sealed and filled in the metal container; Its features are, The outer surface of the metal container includes a heat-receiving surface and a non-heat-receiving surface. The metal container is provided with at least one heat insulation layer corresponding to the external structure of the non-heat-receiving surface, and the at least one heat insulation layer includes a vacuum layer.
2. The directional exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, At least one of the insulation layers also includes an air barrier layer.
3. The directional exothermic phase change molten salt thermal storage device according to claim 2, characterized in that, The air barrier layer is a sealed cavity structure that can block air convection.
4. A directional exothermic phase change molten salt thermal storage device according to claim 2 or 3, characterized in that, The air barrier layer is filled with a heat-insulating material, which is fiberglass and / or aerogel.
5. A directional exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, The vacuum level of the vacuum layer is ≤10. -3 Pa.
6. The directional exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, A reflective layer is provided on the inner wall of the vacuum layer.
7. The directional exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, The heat-receiving surface of the metal container is a recessed platform structure.