Molten salt energy storage device capable of rapidly transferring heat and use method

Abstract

The invention relates to the technical field of fused salt energy storage, and discloses a fused salt energy storage device capable of rapidly transferring heat and a using method. A plurality of molten salt grooves are formed in the heat storage solid body and used for containing phase change materials; a heat transfer unit is arranged at the bottom of the molten salt tank and is used for carrying out enhanced heat transfer on the phase change material; and heat exchange units are distributed in the heat storage solid around the molten salt tank. The molten salt is dispersed and stored in the multiple independent molten salt tanks, and compared with a traditional large storage tank, the equipment cost is saved, and the flexibility is improved. The heat storage solid not only serves as a supporting structure of the molten salt tank, but also can store heat energy and reduce heat loss. The electric heating element arranged at the bottom of the molten salt tank directly heats the solid molten salt through the fins integrated with the tank wall, and energy loss caused by traditional indirect heating is avoided. The heat exchange units distributed around the molten salt groove in the heat storage solid increase the heat exchange area, and the heat release efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of molten salt energy storage technology, specifically to a molten salt energy storage device and its usage method that enables rapid heat transfer. Background Technology

[0002] Molten salt energy storage technology, as one of the core technologies for large-scale thermal energy storage, relies primarily on the specific heat capacity of molten salt (i.e., sensible heat storage) for its heat storage process. In existing technologies, the latent heat of phase change released during the solid-liquid phase transition of molten salt is not effectively utilized. Taking solar salt (a binary mixture of sodium nitrate and potassium nitrate) as an example, it possesses approximately 161 kJ / kg of latent heat of phase change at a phase transition temperature of 220℃. However, conventional molten salt energy storage devices only achieve sensible heat storage and release through temperature fluctuations, resulting in limited heat storage per unit mass of molten salt and difficulty in achieving breakthroughs in system heat storage efficiency.

[0003] Modular molten salt energy storage devices can significantly improve heat storage density by integrating latent heat storage and release functions for phase change. In large-scale applications, their heat storage cost is more than 30% lower than conventional sensible heat storage devices, and their energy storage cost can reach a level comparable to electrochemical energy storage technologies such as lithium-ion batteries. However, the flexibility of modular devices is limited by the molten salt melting efficiency during the commissioning phase: solid molten salt needs to be heated above the phase change temperature by electric heating tubes to be completely liquefied, and the heat transfer design of existing electric heating tubes has the following drawbacks: Uneven heat transfer leads to localized overheating or slow melting of molten salt, prolonging the device start-up time and making it difficult to meet the needs of scenarios requiring rapid response, such as power grid frequency regulation. To improve heat transfer efficiency, structural modifications to the electric heating element body are required, resulting in high replacement and maintenance costs and complex operation of the electric heating element. The high thermal resistance at the contact area between the solid molten salt layer and the electric heating element further reduces the melting efficiency.

[0004] Therefore, how to optimize heat transfer efficiency, shorten molten salt melting time, and take into account the ease of device maintenance without modifying the electric heating tube itself has become a key technical bottleneck for the promotion and application of modular molten salt energy storage devices. Summary of the Invention

[0005] In order to overcome the defects of the existing technology, the purpose of this invention is to provide a molten salt energy storage device and a method of use that can rapidly transfer heat, so as to solve the technical problems of how to optimize the heat transfer efficiency of molten salt energy storage and shorten the melting time of molten salt.

[0006] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a molten salt energy storage device capable of rapid heat transfer, comprising a heat storage solid; a plurality of molten salt tanks are formed on the heat storage solid for placing phase change materials; a heat transfer unit is provided at the bottom of the molten salt tank for enhancing heat transfer to the phase change materials; and heat exchange units are distributed around the molten salt tanks within the heat storage solid.

[0007] Preferably, several molten salt tanks are arranged side by side on the heat storage solid, and the length of the several molten salt tanks corresponds to the length of the heat storage solid.

[0008] Preferably, several molten salt tanks have the same structure, and the two sides of the molten salt tank walls are inclined inward from the top of the heat storage solid to the inside.

[0009] Preferably, the heat storage solid is provided with a plurality of heating holes near the bottom of the molten salt tank, the plurality of heating holes are arranged side by side along the long side of the molten salt tank, and the heating units are respectively arranged in the heating holes.

[0010] Furthermore, the heating holes are integrated with several ribs at the bottom of the molten salt tank.

[0011] Furthermore, the heating unit is an electric heating tube, which is inserted into the corresponding heating hole.

[0012] Furthermore, the electric heating tube is parallel to the long side of the molten salt tank, and the length of the electric heating tube corresponds to the length of the long side of the molten salt tank.

[0013] Preferably, the heat storage solid has a plurality of heat exchange holes surrounding the molten salt tank, and the heat exchange unit is inserted into the heat exchange holes.

[0014] Preferably, the heat exchange unit is a heat exchange tube, which is parallel to the long side of the heat storage solid, and the length of the heat exchange tube corresponds to the length of the long side of the heat storage solid.

[0015] Secondly, the present invention also provides a method of using a molten salt energy storage device capable of rapid heat transfer, which, based on the aforementioned molten salt energy storage device capable of rapid heat transfer, includes the following process: Thermal storage stage: Solid molten salt is placed in the molten salt tank, and the electric heating tube is powered on. The electric heating tube transfers heat through the fins and heats the molten salt in the molten salt tank for thermal storage. Heat release stage: Feed water is introduced into the heat exchange tubes. After the feed water flows through the molten salt tank, it exchanges heat with the molten salt tank and outputs high-temperature steam to complete the molten salt energy storage work.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a molten salt energy storage device with rapid heat transfer, which disperses molten salt in multiple independent molten salt tanks. Compared to traditional large storage tanks, this saves equipment costs and improves flexibility. The heat storage solid not only serves as a supporting structure for the molten salt tanks but also stores thermal energy, reducing heat loss. Electric heating elements at the bottom of the molten salt tanks directly heat the solid molten salt through fins integrated with the tank walls, avoiding the energy loss associated with traditional indirect heating. Heat exchange units distributed around the molten salt tanks within the heat storage solid increase the heat exchange area, significantly improving heat release efficiency.

[0017] Furthermore, the length of the molten salt tank is consistent with the length of the heat storage solid, ensuring that the heat from the electric heating heat transfer unit is uniformly transferred to the molten salt along the length direction.

[0018] Furthermore, the inclined tank walls increase the contact area between the molten salt and the heat storage solid.

[0019] Furthermore, the heating holes are densely arranged along the long side of the molten salt tank, forming a continuous linear heat source, which replaces the traditional point or block heating method and improves the heating efficiency of the molten salt.

[0020] Furthermore, the ribs guide the heat flow to diffuse axially and radially, preventing localized overheating around the heating holes, reducing heat transfer loss from the high-temperature zone to the tank wall, increasing the melting rate of molten salt, reducing the salt melting time, and avoiding equipment damage caused by localized overheating of traditional electric heating tubes.

[0021] Furthermore, the electric heating element is inserted into the corresponding heating hole, facilitating future replacement and maintenance. If the electric heating element burns out during actual system operation, it can be directly pulled out from the hole for replacement. Since the ribs are integrated into the bottom of the tank, they do not affect the enhanced heat transfer and accelerated molten salt melting effect, eliminating the need to weld ribs back onto the new heating element, thus saving costs.

[0022] This invention also provides a method for using a molten salt energy storage device with rapid heat transfer. Several ribs are integrated at the bottom of the molten salt tank via heating holes. These ribs increase the contact area with the molten salt, significantly shortening the melting time. This invention optimizes heat transfer in the electric heating element without modifying the element itself, ensuring uniform heating of the molten salt area, accelerating the melting of solid molten salt, and facilitating subsequent replacement of the heating element. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the molten salt energy storage device in this invention; Figure 2 This is a schematic diagram of the molten salt tank structure in this invention; Figure 3 This is a cross-sectional view of the molten salt tank structure in this invention; Figure 4This is a front view of the molten salt tank structure in this invention; In the diagram: 1. Heat storage solid; 2. Molten salt tank wall; 3. Electric heating tube; 4. Molten salt tank; 5. Heat exchange tube; 6. Fin. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a molten salt energy storage device and its usage method that can rapidly transfer heat, so as to solve the technical problems of how to optimize the heat transfer efficiency of molten salt energy storage and shorten the melting time of molten salt.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment of the present invention, a molten salt energy storage device with rapid heat transfer is provided, including a heat storage solid 1; a plurality of molten salt tanks 4 are formed on the heat storage solid 1 for placing phase change materials; an electric heating heat transfer unit is provided at the bottom of the molten salt tanks 4 for enhancing heat transfer to the phase change materials; and heat exchange units are distributed around the molten salt tanks 4 inside the heat storage solid 1.

[0027] Specifically, several molten salt tanks 4 are arranged side by side on the heat storage solid 1, and the length of the several molten salt tanks 4 corresponds to the length of the heat storage solid 1.

[0028] In this embodiment, the length of the molten salt tank 4 is the same as the length of the heat storage solid 1, ensuring that the heat from the electric heating heat transfer unit is uniformly transferred to the molten salt along the length direction.

[0029] In this embodiment, the length of the molten salt tank 4 is perfectly matched with the length of the heat storage solid 1, ensuring that the heat generated by the heating unit (such as the electric heating tube 3) is evenly distributed along the axial direction of the heat storage solid 1, avoiding local heat concentration or heat blind spots. Multiple molten salt tanks 4 are arranged in parallel along the width direction of the heat storage solid 1, forming a multi-channel heat flow path, so that the molten salt can fully contact the heat storage solid 1 during the heat storage and heat release process, thereby improving the utilization rate of the heat exchange area.

[0030] Specifically, several molten salt tanks 4 have the same structure, and the two sides of the molten salt tank wall 2 of the molten salt tank 4 are inclined inward along the top of the heat storage solid 1.

[0031] In this embodiment, the inclined tank wall increases the contact area between the molten salt and the heat storage solid.

[0032] In this embodiment, the two side walls 2 of the molten salt tank 4 are inclined outward at an angle α (typically 30°-60°), forming a trapezoidal cross-section that is wider at the top and narrower at the bottom. This design generates a radial pressure gradient in the molten salt during flow, which is beneficial for driving natural convection of the molten salt and enhancing heat exchange contact. The inclined tank walls increase the effective volume of the molten salt tank 4 by 10%-15% compared to the straight-wall design, allowing more molten salt to be stored in the same area, thus increasing the heat storage density per unit volume.

[0033] Specifically, a number of heating holes are provided inside the heat storage solid 1 and near the bottom of the molten salt tank 4. The heating holes are arranged side by side along the long side of the molten salt tank 4, and the heating units are respectively arranged inside the heating holes.

[0034] In this embodiment, the heating holes are located at the bottom of the molten salt tank, allowing heat to act directly on the molten salt side, reducing thermal resistance. The heating holes are arranged side-by-side along the long side of the molten salt tank, forming a linear heat source array. This layout concentrates heat at the bottom of the molten salt tank, directly heating the molten salt and shortening the heat conduction path. The heating unit is completely embedded within the heating holes, transferring heat to the molten salt through heat conduction. The dense arrangement of the heating holes along the long side of the molten salt tank forms a continuous linear heat source, replacing traditional point or block heating methods and improving the heating efficiency of the molten salt.

[0035] Among them, the heating holes are integrated with several ribs 6 at the bottom of the molten salt tank 4.

[0036] In this embodiment, the ribs 6 are integrated into the bottom of the molten salt tank and are straight, annular, or spiral ribs. Welded around the stainless steel heating holes, the ribs are in close contact with the electric heating element (absorbing heat) and simultaneously form a single unit with the bottom of the molten salt tank (outputting heat). The ribs and the tank bottom are made of the same material and are integrated (usually integrally cast or welded), eliminating potential loose connections and thermal contact resistance problems caused by mismatched thermal expansion coefficients of different materials. The entire heating area becomes a robust and stable whole with extremely strong resistance to thermal fatigue. The ribs guide heat flow axially and radially, preventing localized overheating around the heating holes, reducing heat conduction loss from the high-temperature zone to the tank wall, increasing the molten salt melting rate, reducing melting time, and preventing equipment damage caused by localized overheating of traditional electric heating elements.

[0037] The heating unit is an electric heating tube 3, which is inserted into the corresponding heating hole.

[0038] In this embodiment, the electric heating tube 3 consists of a resistance wire (heat source), an insulating filling layer (such as magnesium oxide powder, which is thermally conductive and insulating), and a metal shell (such as stainless steel, which is corrosion-resistant and thermally conductive). After the resistance wire is energized and heats up, the heat is conducted to the outer wall of the metal shell through the insulating layer. A pre-set annular heating hole at the bottom of the molten salt tank 4 has an inner diameter matching the outer diameter of the electric heating tube 3, and the hole wall can be machined with threads or a smooth surface. The outer wall of the electric heating tube 3 sheath is in direct contact with the inner wall of the heating hole. Heat is transferred to the outer wall of the hole through metal-to-metal contact heat transfer (the dominant path) or through the gap filled with a thermally conductive medium (such as thermally conductive silicone grease), and then radiated or conducted to the molten salt through the fins 6. The electric heating tube 3 is inserted into the corresponding heating hole, facilitating later replacement and maintenance. If the electric heating tube burns out during actual system operation, it can be directly pulled out of the hole for replacement. Since the fins are integrated into the bottom of the tank, they do not affect the effect of enhanced heat transfer and accelerated molten salt melting, eliminating the need to weld fins back onto the new electric heating tube, thus saving costs.

[0039] The electric heating tube 3 is parallel to the long side of the molten salt tank 4, and the length of the electric heating tube 3 corresponds to the length of the long side of the molten salt tank 4.

[0040] In this embodiment, when the electric heating tube 3 is arranged parallel to the long side of the molten salt tank 4, the contact surface between its metal sheath (such as stainless steel) and the molten salt is an elongated surface. Compared with a vertically inserted point heat source or a short heat source, the heat transfer area of ​​the electric heating tube arranged parallel to the long side is increased.

[0041] Specifically, the heat storage solid 1 has several heat exchange holes surrounding the molten salt tank 4, and the heat exchange unit is inserted into the heat exchange holes.

[0042] In this embodiment, the heat exchange holes in the heat storage solid 1 (such as concrete, graphite, magnesia bricks, etc.) are distributed in a ring array around the molten salt tank 4 (the hole spacing is 1-3 times the hole diameter, such as a hole diameter of 10 mm and a spacing of 10-30 mm), forming an enclosed heat transfer structure within the molten salt tank 4. This layout increases the heat exchange area between the heat exchange unit and the molten salt tank 4, improving heat transfer efficiency. The heat exchange holes are evenly distributed within the molten salt tank 4, and the outlet steam parameters of the heat exchange unit are controlled by adjusting the flow rate of the heat exchange unit.

[0043] Specifically, the heat exchange unit is a heat exchange tube 5, which is parallel to the long side of the heat storage solid 1, and the length of the heat exchange tube corresponds to the length of the long side of the heat storage solid 1.

[0044] In this embodiment, the heat exchange tube is in contact with the heat storage solid forming body, which realizes the process-oriented, segmented and stable heating of the working fluid in the heat exchange tube, and finally outputs high-quality steam.

[0045] In this embodiment, the heat storage solid 1 can preferably be made of graphite, magnesium bricks or other materials; the molten salt tank wall 2 can be made of stainless steel, and the bottom of the tank integrates ribs and heating hole slots for placing electric heating tubes.

[0046] In this embodiment, the molten salt tank undergoes structural improvement. Multiple holes are provided at the bottom of the molten salt tank for installing electric heating tubes. Straight ribs are welded around the electric heating tube slots to fix the heating tubes in place. Simultaneously, by increasing the heat exchange area and disturbing the molten salt flow, the melting rate of the molten salt is significantly improved. The molten salt tank is preferably made of stainless steel, and the ribs around the electric heating tube slots can be of various forms, such as straight ribs or annular ribs.

[0047] In summary, the molten salt energy storage device provided in this embodiment, which enables rapid heat transfer, disperses molten salt in multiple independent molten salt tanks. Compared to traditional large storage tanks, this reduces equipment costs and improves flexibility. The heat storage solid not only serves as a supporting structure for the molten salt tanks but also stores thermal energy, reducing heat loss. Electric heating elements at the bottom of the molten salt tanks directly heat the solid molten salt through fins integrated with the tank walls, avoiding the energy loss associated with traditional indirect heating. The heat exchange units distributed around the molten salt tanks within the heat storage solid increase the heat exchange area, significantly improving heat release efficiency.

[0048] Example 2 This embodiment also provides a method for using a molten salt energy storage device with rapid heat transfer capability. Based on the above-described molten salt energy storage device with rapid heat transfer capability, the method includes the following process: Heat storage stage: Solid molten salt is placed in molten salt tank 4, and electric heating tube 3 is powered on. The electric heating tube 3 transfers heat through fins 6 and heats the molten salt in molten salt tank 4 for heat storage.

[0049] Heat release stage: Liquid is introduced into heat exchange tube 5. After the liquid in heat exchange tube 5 flows through molten salt tank 4, it exchanges heat with molten salt tank 4 and outputs high-temperature steam to complete the molten salt energy storage work.

[0050] In this embodiment, during heat storage, the molten salt is heated and melted in the molten salt tank 4, forming natural convection. In this embodiment, the ribs 6 are straight ribs, arranged along the long side of the molten salt tank. The tips of the ribs break up the solid molten salt clumps that are not easy to melt, thereby accelerating the melting of the molten salt and homogenizing the temperature distribution.

[0051] The physical processes of the heat storage stage in this embodiment are as follows: After power is applied, the electric heating element generates high-temperature heat, which is rapidly and simultaneously conducted through the fins to the walls of the molten salt tank and the solid molten salt. The tank temperature rises, and the molten salt absorbs the heat and melts. The high-temperature tank walls come into contact with the solid molten salt and the initially melted liquid molten salt inside, transferring heat to the molten salt through convection and conduction. During the heating process, the temperature of the solid molten salt gradually rises to its melting point. After reaching the melting point, the molten salt continues to absorb a large amount of heat (latent heat of phase change) and transforms from a solid to a liquid state. After it has completely melted, it continues to heat up to 565°C. The energy stored in this process is far greater than that stored in a simple heating process. Finally, all the molten salt becomes a high-temperature liquid, and the energy is stored in the form of the internal energy (sensible heat + latent heat) of the high-temperature molten salt. The device then enters standby mode.

[0052] The physical process of the exothermic phase in this embodiment is as follows: The cryogenic liquid to be heated (usually water, but could also be heat transfer oil or other media) is pumped into the heat exchange tubes. As the cryogenic liquid flows through the heat exchange tubes coiled or arranged within the heat storage solid, it exchanges heat with the external heat storage solid through the tube walls. The high-temperature molten salt transfers heat to the liquid inside the tubes through the heat storage solid, gradually decreasing its own temperature (it may even partially re-solidify, releasing latent heat of phase change). The liquid inside the tubes absorbs heat, and its temperature rises rapidly. If the input is feedwater, after absorbing sufficient heat, it will vaporize into high-temperature, high-pressure steam. The high-temperature steam that can be used is output from the other end of the heat exchange tubes.

[0053] In this embodiment, the fin 6 is a key heat conduction enhancement structure. It is welded to the outside of the heating annular hole in the molten salt tank wall, integrating with the heating hole and the tank wall, greatly increasing the heat transfer area. The heat from the electric heating tube is first conducted to the fin, and then conducted to the molten salt tank and solid molten salt through the fin with a large area and high efficiency.

[0054] In this embodiment, the electric heating tube directly injects heat into the bottom of the molten salt tank through integrated fins, preferentially heating the heat storage solid and melting the molten salt. The ultra-long heat exchange tube corresponds to the entire length of the heat storage body, realizing an ultra-long flow channel and an ultra-large heat exchange area. After the cold fluid flows in, it has sufficient path and time to exchange heat with the heat source, resulting in high heat utilization.

[0055] This embodiment optimizes the molten salt tank structure and heating tube installation method to improve the molten salt melting rate, reduce heating time, and avoid equipment damage caused by localized overheating of traditional electric heating tubes. It also facilitates later replacement and maintenance of the electric heating tubes. If an electric heating tube burns out during actual system operation, it can be directly pulled out from the hole for replacement. Since the ribs are not welded to the surface of the electric heating tube but to the outside of the heating annular hole in the molten salt tank wall, they are integrated with the heating hole and tank wall, thus not affecting the enhanced heat transfer and accelerated molten salt melting effect. There is no need to re-weld ribs to the new electric heating tube, saving costs.

[0056] In summary, this invention also provides a method for using a molten salt energy storage device with rapid heat transfer. Several ribs are integrated at the bottom of the molten salt tank via heating holes. These ribs increase the contact area with the molten salt, significantly shortening the melting time. This invention optimizes heat transfer in the electric heating element without modifying the element itself, ensuring uniform heating of the molten salt area, accelerating the melting of solid molten salt, and facilitating subsequent replacement of the heating element.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A molten salt energy storage device with rapid heat transfer capability, characterized in that, It includes a heat storage solid (1); the heat storage solid (1) has several molten salt tanks (4) for placing phase change materials; the bottom of the molten salt tanks (4) is provided with heat transfer units for enhancing heat transfer to the phase change materials; heat exchange units are distributed around the molten salt tanks (4) inside the heat storage solid (1).

2. The molten salt energy storage device with rapid heat transfer capability according to claim 1, characterized in that, Several molten salt tanks (4) are arranged side by side on the heat storage solid (1), and the length of the several molten salt tanks (4) corresponds to the length of the heat storage solid (1).

3. The molten salt energy storage device with rapid heat transfer according to claim 1, characterized in that, Several molten salt tanks (4) have the same structure. The two sides of the molten salt tank wall (2) of the molten salt tank (4) are inclined inward from the top of the heat storage solid (1).

4. The molten salt energy storage device with rapid heat transfer according to claim 1, characterized in that, The heat storage solid (1) is provided with several heating holes at the bottom of the molten salt tank (4). The heating holes are arranged side by side along the long side of the molten salt tank (4), and the heating units are respectively set in the heating holes.

5. A molten salt energy storage device with rapid heat transfer capability according to claim 4, characterized in that, The heating holes are provided with several ribs (6) integrated at the bottom of the molten salt tank (4).

6. A molten salt energy storage device with rapid heat transfer capability according to claim 4, characterized in that, The heating unit is an electric heating tube (3), which is inserted into the corresponding heating hole.

7. A molten salt energy storage device with rapid heat transfer capability according to claim 6, characterized in that, The electric heating tube (3) is parallel to the long side of the molten salt tank (4), and the length of the electric heating tube (3) corresponds to the length of the long side of the molten salt tank (4).

8. A molten salt energy storage device with rapid heat transfer capability according to claim 1, characterized in that, The heat storage solid (1) has several heat exchange holes surrounding the molten salt tank (4), and the heat exchange unit is inserted into the heat exchange holes.

9. A molten salt energy storage device with rapid heat transfer capability according to claim 1, characterized in that, The heat exchange unit is a heat exchange tube (5), which is parallel to the long side of the heat storage solid (1), and the length of the heat exchange tube (5) corresponds to the length of the long side of the heat storage solid (1).

10. A method of using a molten salt energy storage device with rapid heat transfer capability, based on the molten salt energy storage device with rapid heat transfer capability as described in any one of claims 1-9, characterized in that, The process includes the following: Heat storage stage: Solid molten salt is placed in molten salt tank (4), and electric heating tube (3) is powered on. The electric heating tube (3) transfers heat through fins (6) and heats the molten salt in molten salt tank (4) for heat storage. Heat release stage: Feed water is introduced into the heat exchange tube (5). After the feed water in the heat exchange tube (5) flows through the molten salt tank (4), it exchanges heat with the molten salt tank (4) and outputs high-temperature steam to complete the molten salt energy storage work.

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