A stable exothermic phase change molten salt heat storage device

Abstract

This invention discloses a stable heat-releasing phase change molten salt thermal storage device, comprising a metal container and a phase change molten salt sealed and filled within the metal container. The top of the metal container has a heat-receiving surface. The heat-receiving surface is a recessed platform structure immersed in the phase change molten salt, or a heat-conducting component immersed in the phase change molten salt is connected to the inner wall of the heat-receiving surface. A compensation space suitable for volume changes during the phase change of the phase change molten salt is formed on the outer periphery of the platform structure or the heat-conducting component inside the metal container. By constructing the heat-receiving surface as a recessed platform structure or connecting a heat-conducting component to the inner wall of the heat-receiving surface, this invention ensures that the platform or heat-conducting component is always immersed in the phase change molten salt by controlling the immersion depth of the platform or heat-conducting component. This ensures that there is always a direct heat transfer path between the phase change molten salt and the heat-receiving surface, guaranteeing that the heat-receiving surface can stably and continuously release heat efficiently.

Description

Technical Field

[0001] This utility model relates to the field of molten salt phase change thermal storage technology, and in particular to a phase change molten salt thermal storage device that provides stable heat release. Background Technology

[0002] When a phase change molten salt tank is used as a heat storage unit and the heat-receiving surface is located at the top of the tank, the molten salt will undergo a phase change from liquid to solid during the continuous heat release process inside the tank, resulting in a decrease in the volume of the molten salt and a lower molten salt level. However, since most existing heat-receiving surfaces are simple planar or curved structures, the lowering of the molten salt level inside the tank will interrupt the direct heat transfer path from the molten salt to the top heat-receiving surface, greatly reducing the efficiency of heat transfer from the molten salt to the heat-receiving surface. This makes it difficult for the heat-receiving surface to stably and continuously release heat efficiently, indicating room for improvement. Utility Model Content

[0003] The present invention aims to overcome the defects in the prior art and provide a phase change molten salt thermal storage device with stable heat release. By constructing the heat-receiving surface as a recessed platform structure or connecting a heat-conducting component on the inner wall of the heat-receiving surface, a direct heat transfer path is always present between the phase change molten salt and the heat-receiving surface, ensuring that the heat-receiving surface can continuously and stably release heat efficiently.

[0004] To achieve the above objectives, this utility model provides a stable heat-releasing phase change molten salt thermal storage device, including a metal container and a phase change molten salt sealed and filled in the metal container, wherein the top of the metal container has a heat-extracting surface; The heat-collecting surface is a recessed platform structure immersed in the phase change molten salt, or a heat-conducting component immersed in the phase change molten salt is connected to the inner wall of the heat-collecting surface. The outer periphery of the corresponding sinkhole structure or heat-conducting component inside the metal container is formed with a compensation space suitable for the volume change of the phase change molten salt during the phase change process.

[0005] A further setting is made so that when the phase change molten salt in the metal container is in a solid state, the sink structure or heat-conducting component is still immersed in the phase change molten salt.

[0006] The further configuration includes a heating element, which is disposed on the top, bottom, or peripheral wall of the metal container to heat the phase change molten salt inside the metal container by heating the metal container; Alternatively, the heating element can be placed inside a metal container and immersed in the phase change molten salt to directly heat the phase change molten salt.

[0007] Further configuration includes a heat-conducting panel disposed on the top of the metal container and connected to the heat-extracting surface for heat transfer.

[0008] The metal container is further configured to be connected to the heat-conducting panel by a heat-conducting material, which is aluminum, copper, or graphite.

[0009] Compared with the prior art, the present invention has a simple and reasonable structure. By constructing the heat-receiving surface as a recessed platform or connecting a heat-conducting component to the inner wall of the heat-receiving surface, the immersion depth of the platform or heat-conducting component can be controlled to ensure that it is always immersed in the phase change molten salt. This ensures that there is always a direct heat transfer path between the phase change molten salt and the heat-receiving surface, thus ensuring that the heat-receiving surface can continuously and stably release heat efficiently. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the thermal storage device in Embodiment 1 (in a liquefied state). Figure 2 This is a schematic diagram of the heat storage device in Embodiment 1 (in solidified state). Figure 3 This is a schematic diagram of the heat storage device in Example 2 (in solidified state).

[0011] The following reference numerals are marked on the accompanying drawings: 1. Metal container; 11. Heating surface; 12. Settling platform; 13. Compensation space; 2. Phase change molten salt; 3. Heat-conducting components; 4. Heating element; 5. Heat-conducting panel. Detailed Implementation

[0012] 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.

[0013] This utility model discloses a stable heat-releasing phase change molten salt thermal storage device, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes a metal container 1, a high-temperature phase change molten salt 2, a heating element 4, and a heat-conducting panel 5. The high-temperature phase change molten salt 2 is filled in a sealed metal container 1 for use as a heat storage unit. The metal container 1 is made of a highly corrosion-resistant material and has a heat-receiving surface 11 on its top. The shape of the metal container 1 can be cylindrical, square, or other irregular shapes. The heat-conducting panel 5 is located on the top of the metal container 1 and is heat-transferringly connected to the heat-receiving surface 11 of the metal container 1. The heat-conducting panel 5 is used to heat items placed on it. The heating element 4 is used to heat the high-temperature phase change molten salt 2 to enable the molten salt to undergo phase change energy storage.

[0014] Example 1

[0015] In this embodiment, as Figure 1 and Figure 2As shown, the heat-receiving surface 11 of the metal container 1 is a recessed platform 12 structure that is immersed in the phase change molten salt 2. The outer periphery of the platform 12 inside the metal container 1 is formed with a compensation space 13 that is suitable for the volume change during the phase change process. The minimum immersion depth design parameter of the platform 12 needs to be calculated according to the solidification shrinkage ratio of the phase change molten salt 2 to ensure that the platform 12 is always immersed in the phase change process of the phase change molten salt 2 (that is, when the phase change molten salt 2 is in the solidified state (small volume state), the platform 12 is still immersed in the phase change molten salt 2). That is, the liquid level change generated during the phase change molten salt 2 from liquid to solid always takes place within the compensation space 13. This ensures that there is always an efficient direct heat transfer path between the heat-receiving surface 11 and the phase change molten salt 2, so that the heat-receiving surface 11 can continuously and stably release heat efficiently.

[0016] In this embodiment, for the heat transfer effect between the heat-conducting panel 5 and the heat-receiving surface 11, a heat-conducting part is provided on the lower surface of the heat-conducting panel 5 and placed in the recessed platform 12 of the heat-receiving surface 11. The heat-conducting panel 5 and the metal container 1 are connected by a heat-conducting material, which is aluminum, copper or graphite with high thermal conductivity.

[0017] In this embodiment, the heating element 4 is disposed on the top of the metal container 1. Figure 1 ) or set on the bottom of metal container 1 ( Figure 2 The heating element 4 can also be spirally wound or wrapped around the periphery of the metal container 1, so that the heating element 4 heats the phase change molten salt 2 inside the metal container 1 by heating the metal container 1; the heating element 4 can also be placed inside the metal container 1 and immersed in the phase change molten salt 2 to directly heat the phase change molten salt 2.

[0018] Example 2

[0019] Compared to Embodiment 1, the main difference lies in the different forms in which the compensation space 13 is formed; in Embodiment 2, as... Figure 3 As shown, the heat-receiving surface 11 of the metal container 1 has a conventional planar structure. A block-shaped heat-conducting component 3 immersed in the phase change molten salt 2 is connected to the inner wall of the heat-receiving surface 11. This creates a compensation space 13 on the outer periphery of the heat-conducting component 3 inside the metal container 1, ensuring that the sink platform 12 is always immersed during the phase change of the phase change molten salt 2. This ensures that there is always an efficient direct heat transfer path between the heat-receiving surface 11 and the phase change molten salt 2, so that the heat-receiving surface 11 can continuously and stably release heat efficiently.

[0020] Compared with the prior art, the present invention has a simple and reasonable structure. By constructing the heat-receiving surface as a recessed platform or connecting a heat-conducting component to the inner wall of the heat-receiving surface, the immersion depth of the platform or heat-conducting component can be controlled to ensure that it is always immersed in the phase change molten salt. This ensures that there is always a direct heat transfer path between the phase change molten salt and the heat-receiving surface, thus ensuring that the heat-receiving surface can continuously and stably release heat efficiently.

[0021] 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 stable heat-releasing phase change molten salt thermal storage device, comprising a metal container and a phase change molten salt sealed and filled in the metal container, wherein the top of the metal container has a heat-extracting surface; Its features are, The heat-collecting surface is a recessed platform structure immersed in the phase change molten salt, or a heat-conducting component immersed in the phase change molten salt is connected to the inner wall of the heat-collecting surface. The outer periphery of the corresponding sinkhole structure or heat-conducting component inside the metal container is formed with a compensation space suitable for the volume change of the phase change molten salt during the phase change process.

2. The stable exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, When the phase change molten salt inside the metal container is in a solid state, the sink structure or heat-conducting component is still immersed in the phase change molten salt.

3. The stable exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, It also includes a heating element, which is disposed on the top, bottom or peripheral wall of the metal container to heat the phase change molten salt inside by heating the metal container; Alternatively, the heating element can be placed inside a metal container and immersed in the phase change molten salt to directly heat the phase change molten salt.

4. The stable exothermic phase change molten salt thermal storage device according to claim 1, characterized in that, It also includes a heat-conducting panel that is mounted on the top of the metal container and connected to the heat-extracting surface for heat transfer.

5. A stable exothermic phase change molten salt thermal storage device according to claim 4, characterized in that, The metal container is connected to the heat-conducting panel by a heat-conducting material, which may be aluminum, copper, or graphite.

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