Air drying device for fused salt heat storage system and air intake and exhaust method

Abstract

The invention discloses an air drying device used for a fused salt heat storage system and an air intake and exhaust method, and belongs to the field of fused salt heat storage, the air drying device used for the fused salt heat storage system comprises a water removal chamber used for being communicated with outside air, and the water removal chamber is internally provided with a water removal assembly; the heating chamber is communicated with the water removal chamber, is used for being communicated with a fused salt pipeline through a connecting pipeline and is used for forming an external pressure difference at the two ends of the air drying device; one end of the thermoelectric generator is used for being connected with the fused salt pipeline, and the other end of the thermoelectric generator is used for being in contact with outside air, so that the two ends of the thermoelectric generator generate temperature difference; the thermoelectric refrigerating unit is electrically connected with the thermoelectric generator, the cold end of the thermoelectric refrigerating unit is connected with the water removal chamber, and the hot end of the thermoelectric refrigerating unit is connected with the heating chamber, so that the internal pressure difference of the air drying device is formed between the heating chamber and the water removal chamber. The self-adaptive air intake and exhaust switching device has the technical effects that self-adaptive air intake and exhaust switching can be conveniently realized, and intervention of a control system is not needed.

Description

Technical Field

[0001] This invention relates to molten salt thermal storage, and more particularly to an air drying device and air intake / exhaust method for molten salt thermal storage systems. Background Technology

[0002] Molten salt thermal energy storage systems utilize molten salt as the thermal storage medium to achieve large-scale storage and release of thermal energy. They are widely used in solar thermal power generation, industrial waste heat recovery, and grid peak shaving, and are one of the key technologies for achieving stable supply and efficient utilization of renewable energy.

[0003] Molten salt thermal storage systems generally need to be connected to the outside air to balance the internal air pressure of the system with the outside air pressure. However, the outside air contains moisture, and molten salt is highly sensitive to moisture. Moisture intrusion can easily lead to problems such as equipment corrosion, reduced thermal conductivity of molten salt, and system failure.

[0004] To address the aforementioned issues, air drying devices are typically installed in molten salt thermal storage systems to dry moisture in the outside air. However, the exhaust and intake of these air drying devices usually require separate control systems, necessitating manual monitoring. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide an air drying device for a molten salt thermal storage system, which facilitates adaptive switching between air intake and exhaust without the need for a control system intervention; another purpose of this invention is to provide an air intake and exhaust method.

[0006] Technical solution: An air drying device for a molten salt thermal storage system, comprising: A dewatering chamber for communicating with the outside air, wherein the dewatering chamber has a dewatering component; A heating chamber connected to the dehydration chamber is connected to a molten salt pipeline via a connecting pipe, which is used to create an external pressure difference at both ends of the air drying device. A thermoelectric generator, one end of which is connected to the molten salt pipe, and the other end of which is in contact with the outside air, so as to generate a temperature difference between the two ends of the thermoelectric generator; A thermoelectric cooler is electrically connected to the thermoelectric generator, with the cold end of the thermoelectric cooler connected to the dehydration chamber and the hot end of the thermoelectric cooler connected to the heating chamber, so as to create an internal pressure difference between the heating chamber and the dehydration chamber of the air drying device.

[0007] Optionally, the inner wall of the heating chamber connected to the thermoelectric cooler is provided with a first heat exchange fin, and the heating chamber near the connecting pipe and / or the connecting pipe is provided with a second heat exchange fin.

[0008] Optionally, a baffle plate connected to the heating chamber may also be included to guide the flow of air within the heating chamber.

[0009] Optionally, the connecting pipe is used to connect the heating chamber and the molten salt pipe from top to bottom, and the tops of the heating chamber and the connecting pipe corresponding to each other along the direction of gravity are configured as the right top, the height of the right top being less than the height of the left top.

[0010] Optionally, a transition pipe is also included, through which the dewatering chamber and the heating chamber are connected, and the transition pipe is at least partially used as a space between the heating chamber and the molten salt pipe.

[0011] Optionally, the water removal component includes: A hydrophobic membrane connected to the dewatering chamber is used to block liquid water; The capillary adsorption dehydration layer connected to the dehydration chamber is used to adsorb free water and aerosol moisture.

[0012] Optionally, the water removal component includes: A condenser tube is connected to the dehydration chamber, and the condenser tube is connected to the inner wall of the dehydration chamber near the cold end of the thermoelectric cooler, for condensing moisture in the air into liquid water; A water absorption unit connected to the water removal chamber is used to absorb liquid water on the condenser tube; The outlet of the condenser tube and the water absorption unit are connected sequentially along the direction of gravity so that the liquid water condensed on the condenser tube flows naturally into the water absorption unit.

[0013] Optionally, the water removal assembly further includes a refrigeration shell connected to the inner wall of the water removal chamber near the cold end of the thermoelectric cooler. The refrigeration shell contains a cooling material, the condenser tube is located inside the refrigeration shell, and the cooling material is wrapped around the condenser tube.

[0014] Optionally, the hydrophobic membrane, the capillary adsorption dehydration layer, the condenser tube, and the water absorption unit are arranged sequentially along the path of outside air flowing into the air drying device.

[0015] An air drying device's intake and exhaust method includes: The air drying device is installed in the molten salt thermal storage system to create an internal pressure difference between the heating chamber and the dehydration chamber, and to create an external pressure difference between the two ends of the air drying device. The airflow direction formed by the internal pressure difference is from the heating chamber to the dewatering chamber, and the direction of the external pressure difference changes based on the state changes of the molten salt thermal storage system; When the molten salt thermal storage system is in a salt-free state, the external pressure difference is in the opposite direction to the internal pressure difference, and the external pressure difference is greater than the internal pressure difference, driving outside air through the air drying device to enter the molten salt thermal storage system. When the molten salt thermal storage system is in operation, the external pressure difference and the internal pressure difference are in the same direction, jointly driving the internal hot air through the air drying device to be discharged to the outside, and drying and restoring the water removal components in the water removal chamber.

[0016] Beneficial effects: (1) When the molten salt heat storage system of this embodiment is in the salt-removing state, the molten salt in the molten salt pipe is discharged to form a negative pressure, and the temperature of the molten salt pipe is lower than that of the normal working state. For the air drying device, the external pressure difference between the molten salt pipe and the outside air is strengthened, and the direction of the external pressure difference is opposite to that of the internal pressure difference. This can overcome the internal pressure difference of the air drying device, so that the outside air can be forced into the molten salt pipe without the intervention of the control system or the presence of personnel, thus achieving adaptive air intake.

[0017] (2) When the molten salt thermal storage system of this embodiment is in normal working condition, no negative pressure environment is generated in the molten salt pipeline, and the temperature of the molten salt pipeline is at a high level. For the air drying device, the direction of the external pressure difference formed between the molten salt pipeline and the outside air is consistent with the direction of the internal pressure difference of the air drying device, which further strengthens the tendency to discharge the internal air to the outside, reduces or even eliminates the possibility of outside air entering the molten salt pipeline through the air drying device. Therefore, there is no need to set up a valve to close it to block the entry of outside air, no need for control system intervention, no need for personnel to be on duty, and achieves adaptive exhaust.

[0018] (3) The air drying device of this embodiment has the tendency to discharge the internal air to the outside air, and has a self-protection insurance function, so that the outside air cannot enter the molten salt pipe at will through the air drying device, thereby preventing moisture from easily entering the molten salt pipe with the air.

[0019] (4) The air discharged from the molten salt pipe of the molten salt thermal storage system in this embodiment is a high-temperature gas, which can directly heat up and remove water from the water removal components in the water removal chamber without the need for additional heating elements to restore water removal, thus achieving energy saving.

[0020] (5) The heating chamber in this embodiment is designed so that even if the water removal component in the water removal chamber exceeds the water absorption limit, the outside air can still be dried in the heating chamber. The heating chamber acts as a safety device, the evaporated water vapor remains in the heating chamber, and the dry outside air enters the molten salt pipe to prevent moisture from being carried into the molten salt pipe. Attached Figure Description

[0021] Figure 1 This is one of the structural diagrams of an air drying device for a molten salt thermal storage system according to Embodiment 1 of the present invention; Figure 2 This is a second structural diagram of an air drying device for a molten salt thermal storage system according to Embodiment 1 of the present invention; Figure 3 This is the third structural diagram of an air drying device for a molten salt thermal storage system according to Embodiment 1 of the present invention; In the diagram: 1. Dewatering chamber; 2. Heating chamber; 21. First heat exchange fin; 22. Baffle plate; 23. Second heat exchange fin; 3. Molten salt pipe; 4. Thermoelectric generator; 5. Thermoelectric cooler; 6. Dewatering assembly; 61. Hydrophobic membrane; 62. Capillary adsorption dewatering layer; 631. Condenser; 632. Water absorption unit; 633. Cooling shell; 634. Cooling material; 7. Connecting pipes; 8. Transition pipes. Detailed Implementation

[0022] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0024] Example 1 like Figures 1-3 This embodiment provides an air drying device for a molten salt thermal storage system, comprising: a dehydration chamber 1 for communicating with the outside air, the dehydration chamber 1 having a dehydration component 6; a heating chamber 2 communicating with the dehydration chamber 1, the heating chamber 2 being connected to a molten salt pipeline 3 via a connecting pipe 7, for forming an external pressure difference at both ends of the air drying device; a thermoelectric generator 4, one end of the thermoelectric generator 4 being connected to the molten salt pipeline 3, and the other end of the thermoelectric generator 4 being in contact with the outside air, so that a temperature difference is generated at both ends of the thermoelectric generator 4; and a thermoelectric cooler 5 electrically connected to the thermoelectric generator 4, the cold end of the thermoelectric cooler 5 being connected to the dehydration chamber 1, and the hot end of the thermoelectric cooler 5 being connected to the heating chamber 2, so that an internal pressure difference of the air drying device is formed between the heating chamber 2 and the dehydration chamber 1.

[0025] Specifically, the dehydration chamber 1 is connected to the outside air, facilitating the entry of outside air into the dehydration chamber 1 and the exhaust of internal air from the dehydration chamber 1; the dehydration component 6 is carried by the dehydration chamber 1 and is used to remove moisture from the outside air inside the dehydration chamber 1. The dehydration component 6 may specifically include a hydrophobic membrane 61, a capillary adsorption dehydration layer 62, etc.; the heating chamber 2 is used to connect the dehydration chamber 1 and the molten salt pipe 3; the thermoelectric generator 4 is used to generate electricity using the temperature difference, thereby supplying power to the thermoelectric cooler 5; the thermoelectric cooler 5 is used to achieve cooling and heating; the position of the molten salt pipe 3 is preferably lower than that of the heating chamber 2, which facilitates the connection of the connecting pipe 7 from top to bottom between the heating chamber 2 and the molten salt pipe 3. On the one hand, this conforms to the upward flow trend of hot air in the molten salt pipe 3, prompting it to enter the heating chamber 2 and strengthening the trend of air exhaust to the outside. On the other hand, the water vapor evaporated in the heating chamber 2 gathers above the heating chamber 2, preventing it from entering the molten salt pipe 3.

[0026] The working principle of an air drying device for a molten salt thermal storage system in this embodiment is as follows: (1) Without considering the pressure difference between the outside air and the molten salt pipe 3, since there is a temperature difference between the outside air and the molten salt pipe 3, and since one end of the thermoelectric generator 4 is used to connect with the molten salt pipe 3 and the other end of the thermoelectric generator 4 is used to contact the outside air, it is easy to generate a temperature difference between the two ends of the thermoelectric generator 4, thereby generating electrical energy, which in turn is easy to supply power to the thermoelectric cooler 5, so that the cold end of the thermoelectric cooler 5 cools the dewatering chamber 1 and the hot end of the thermoelectric cooler 5 heats the heating chamber 2, so that the air pressure in the heating chamber 2 is greater than the air pressure in the dewatering chamber 1 (i.e., forming an internal pressure difference), and finally the air drying device has the tendency to discharge the internal air to the outside air, which has a self-protection insurance function, so that the outside air cannot enter the molten salt pipe 3 through the air drying device at will, thereby preventing moisture from easily entering the molten salt pipe 3 with the air.

[0027] (2) For example Figure 2When the molten salt thermal storage system is in a salt-removing state, the molten salt in the molten salt pipe 3 is drained, creating a negative pressure. The temperature of the molten salt pipe 3 is also lower than in normal operation. For the air drying device, the external pressure difference between the molten salt pipe 3 and the outside air is enhanced, and the direction of the external pressure difference is opposite to the internal pressure difference. This overcomes the internal pressure difference of the air drying device, allowing outside air to be forced into the molten salt pipe 3 without human intervention, achieving adaptive air intake. The internal pressure difference is approximately 4 kPa, and the external pressure difference is approximately 6 kPa. Furthermore, the outside air is dried as it flows through the air drying device. Specifically, moisture is removed by the dehydration component 6 in the dehydration chamber 1, and drying and heating are achieved in the heating chamber 2. The heating chamber 2 ensures that even if the dehydration component 6 in the dehydration chamber 1 exceeds its absorption limit, the outside air can still be dried in the heating chamber 2. The heating chamber 2 acts as a safety device; the evaporated water vapor remains in the heating chamber 2, while the dried outside air enters the molten salt pipe 3, preventing moisture from being carried into the molten salt pipe 3.

[0028] Furthermore, during the salt removal process, the dynamic process of outside air infiltrating and flowing through the air drying device due to negative pressure can be divided into different states through key parameters, corresponding to different exhaust forms. The following is a systematic analysis and parameter differentiation: (It should be noted that there is no sequential relationship between salt removal stage a and salt removal stage b; the key is to determine at which temperature salt removal occurs.) a. Salt-repellent stage (low temperature / high negative pressure) State characteristics: 1) Molten salt temperature: dropped below 300°C; 2) System pressure: significant negative pressure (e.g. -0.1MPa), high external air intake rate; 3) State of water removal component 6: water removal component 6 is not saturated with water absorption capacity, and adsorption efficiency >90%.

[0029] Exhaust method: After the outside air passes through the air drying device, the moisture is efficiently adsorbed, and the dried outside air enters the molten salt pipe 3.

[0030] b. Salt-absorbing stage (medium-high temperature / dynamic equilibrium) State characteristics: 1) Molten salt temperature: greater than 300°C (system is cooling); 2) System pressure: negative pressure weakens (e.g. -0.05MPa), and the outside air flow rate decreases; 3) Water removal component 6 state: water absorption is close to the upper limit, and the adsorption efficiency drops to below 50%.

[0031] Exhaust method: After the outside air containing water enters the dehydration chamber 1, the water that is not completely adsorbed is evaporated in the heating chamber 2, and the heating temperature is 120–150°C (to ensure the water vaporization and avoid salt corrosion). The water vapor is retained in the heating chamber 2, and the dry outside air enters the molten salt pipe 3.

[0032] (3) such as Figure 3When the molten salt thermal storage system is in normal working condition, no negative pressure environment is generated in the molten salt pipe 3, and the temperature of the molten salt pipe 3 is at a high level. For the air drying device, the direction of the external pressure difference formed between the molten salt pipe 3 and the outside air is consistent with the direction of the internal pressure difference of the air drying device, which further strengthens the tendency to discharge the internal air to the outside, reduces or even eliminates the possibility of outside air entering the molten salt pipe 3 through the air drying device. Therefore, there is no need to set up a valve to close it to block the entry of outside air, and no personnel are required to operate it, thus achieving adaptive exhaust.

[0033] Furthermore, the air discharged from the molten salt pipe 3 is high-temperature gas, which can directly heat and remove water from the water removal component 6 in the water removal chamber 1, eliminating the need for additional heating elements for water removal and restoration, thus achieving energy saving. Simultaneously, during the dehumidification process, the kinetic energy of the gas escaping the water vapor is significantly greater than the condensation resistance, allowing some condensate to be carried out along with it. The heating and dehydration process is divided into two stages: a. Preheating, drying, and regeneration stage Status characteristics: 1) Molten salt temperature: greater than 300°C (molten salt thermal storage system restarts and preheats); 2) System pressure: close to atmospheric pressure (salt removal is completed, negative pressure is released); 3) Dehydration component 6 status: fully saturated (regeneration required).

[0034] Exhaust method: Heating chamber 2 starts high-temperature drying (approximately 200°C), and water vapor is discharged. Exhaust temperature is 150-200°C (to avoid low-temperature condensation). Exhaust pressure is slightly positive (+0.01MPa, to force the removal of moisture).

[0035] b. Working status regeneration stage State characteristics: 1) Molten salt temperature: 450-565℃; 2) System pressure: slightly positive pressure (approximately +0.02MPa); 3) Water removal component 6 state: fully saturated (requires regeneration).

[0036] Exhaust method: Heating chamber 2 starts high-temperature drying (approximately 200℃), and water vapor is discharged. Exhaust temperature is above 200℃. Exhaust pressure is slightly positive (forced removal of moisture).

[0037] Furthermore, such as Figure 1 The water removal component 6 includes a hydrophobic membrane 61 connected to the water removal chamber 1 for blocking liquid water.

[0038] Specifically, the hydrophobic membrane 61 utilizes its water-pressurizing properties to directly intercept most of the liquid water droplets (particle size > 1 μm) in the outside air, while allowing gas to pass through. The hydrophobic membrane 61 can be made of low surface energy materials such as polytetrafluoroethylene and polyvinylidene fluoride.

[0039] Furthermore, such as Figure 1The water removal component 6 includes a capillary adsorption water removal layer 62 connected to the water removal chamber 1, which is used to adsorb free water and aerosol water.

[0040] Specifically, the capillary adsorption dehydration layer 62 utilizes the hydrophilicity and porous structure of the material to generate capillary force, and then adsorbs tiny water droplets (particle size range 0.1–1 μm) and some water vapor from the outside air through capillary force. The material of the capillary adsorption dehydration layer 62 can be sponge, silicone, etc.

[0041] Furthermore, such as Figure 1 The dewatering assembly 6 includes: a condenser pipe 631 connected to the dewatering chamber 1, the condenser pipe 631 being connected to the inner wall of the dewatering chamber 1 near the cold end of the thermoelectric cooler 5, for condensing moisture in the air into liquid water; and a water absorption unit 632 connected to the dewatering chamber 1 for absorbing the liquid water on the condenser pipe 631; wherein the outlet of the condenser pipe 631 and the water absorption unit 632 are sequentially connected along the direction of gravity so that the liquid water condensed on the condenser pipe 631 flows naturally into the water absorption unit 632.

[0042] Specifically, the cold end of the thermoelectric cooler 5 sequentially cools the dewatering chamber 1 and the condenser tube 631, causing the remaining water vapor in the outside air to condense into liquid water inside the condenser tube 631. Under the action of gravity, the liquid water is absorbed by the water absorption unit 632. The condenser tube 631 is preferably disc-shaped to increase its cooling surface area, thus ensuring good cooling and condensation effects. The water absorption unit 632 can be made of thermosensitive hydrogel, sponge, etc.

[0043] Furthermore, such as Figure 1 The dewatering assembly 6 also includes a cooling shell 633 connected to the inner wall of the side of the dewatering chamber 1 near the cold end of the thermoelectric cooler 5. The cooling shell 633 contains a cooling material 634, and the condenser tube 631 is located inside the cooling shell 633. The cooling material 634 is wrapped around the condenser tube 631.

[0044] Specifically, the cooling capacity of the cold end of the thermoelectric cooler 5 is sequentially transferred to the condenser tube 631 through the water removal chamber 1, the cooling shell 633, and the heat-conducting material 634. Since the heat-conducting material 634 is wrapped around the condenser tube 631, it ensures good heat transfer. The heat-conducting material 634 can be made of copper, aluminum, etc. It should be noted that the cooling shell 633 and the heat-conducting material 634 can be made of the same material, essentially forming a single piece, or they can be made of different materials.

[0045] Furthermore, such as Figure 1 The hydrophobic membrane 61, the capillary adsorption dehydration layer 62, the condenser tube 631, and the water absorption unit 632 are arranged sequentially along the path of the outside air flowing into the air drying device.

[0046] In the dehydration chamber 1, the dehydration assembly 6 preferably includes three stages of dehydration: the first stage is a hydrophobic membrane 61, the second stage is a capillary adsorption dehydration layer 62, and the third stage is a condenser tube 631 and a water absorption unit 632. This allows outside air to pass sequentially through the hydrophobic membrane 61, the capillary adsorption dehydration layer 62, the condenser tube 631, and the water absorption unit 632 for dehydration, conforming to the principle of "physical interception first, followed by deep removal," thus balancing efficiency, energy consumption, and equipment lifespan. Furthermore, the heating chamber 2 can also serve as an additional fourth stage of dehydration. The heating chamber 2 receives the water vapor desorbed by the water absorption unit 632, completely evaporates the moisture through high temperature, and discharges it, while simultaneously providing a regeneration heat source for the dehydration assembly 6.

[0047] Furthermore, such as Figure 1 The heating chamber 2 has a first heat exchange fin 21 on the inner wall of the side connected to the thermoelectric cooler 5.

[0048] Specifically, the hot end of the thermoelectric cooler 5 heats the heating chamber 2, thereby raising the temperature of the air inside the heating chamber 2. The portion of the heating chamber 2 connected to the hot end of the thermoelectric cooler 5 receives heat and then conducts the heat into its own internal cavity. The first heat exchange fins 21 are used to increase the air heating area, thereby increasing the air heating effect. The number of first heat exchange fins 21 is not limited and can be four, five, etc. In order to prevent excessive local temperature, the lengths of adjacent first heat exchange fins 21 are preferably different.

[0049] Furthermore, such as Figure 1 It also includes a baffle plate 22 connected to the heating chamber 2 to guide the flow of air in the heating chamber 2.

[0050] Specifically, the baffle 22 facilitates the increase of the air flow path in the heating chamber 2, which facilitates the full heating of the air. The number of baffles 22 is not limited and can be two, three, etc. The number of baffles 22 is preferably two, and the two baffles 22 are staggered along the bottom and top of the inner side of the heating chamber 2.

[0051] Furthermore, such as Figure 1 The heating chamber 2 is provided with a second heat exchange fin 23 on the side near the connecting pipe 7 and / or inside the connecting pipe 7.

[0052] Specifically, the second heat exchange fins 23 facilitate the increase of heat absorbed by the heating chamber 2 from the molten salt pipe 3, and facilitate the dehydration and restoration of the dehydration component 6. The number of the second heat exchange fins 23 is not limited and can be two, three, etc. In order to increase the heat exchange uniformity, the second heat exchange fins 23 are preferably arranged in a staggered manner on both sides.

[0053] Furthermore, such as Figure 1The connecting pipe 7 is used to connect the heating chamber 2 and the molten salt pipe 3 from top to bottom, and the tops of the heating chamber 2 and the connecting pipe 7 along the direction of gravity are configured as the right top, the height of the right top is less than the height of the left top.

[0054] Specifically, because water vapor has a lower density than air at the same temperature and pressure, it is easier for water vapor to be positioned relatively high. Also, because the height of the top right side is less than the height of the top left side, water vapor can easily gather at the top left side of the heating chamber 2, thus making it easier for water vapor to move away from the connecting pipe 7 and the molten salt pipe 3.

[0055] Furthermore, such as Figure 1 It also includes a transition pipe 8, through which the dewatering chamber 1 and the heating chamber 2 are connected, and the transition pipe 8 is at least partially used between the heating chamber 2 and the molten salt pipe 3.

[0056] Specifically, the transition pipe 8 is used to connect the dewatering chamber 1 and the heating chamber 2; since the transition pipe 8 is at least partially used between the heating chamber 2 and the molten salt pipe 3, it is convenient for the molten salt pipe 3 to generate a certain heating effect on the transition pipe 8, and preferably the transition pipe 8 is wrapped around the molten salt pipe 3.

[0057] like Figures 1-3 This embodiment also provides an air intake and exhaust method for an air drying device, including: An air drying device is installed in a molten salt thermal storage system to create an internal pressure difference between the heating chamber 2 and the dehydration chamber 1, and to create an external pressure difference between the two ends of the air drying device. The airflow direction formed by the internal pressure difference is from the heating chamber 2 to the dewatering chamber 1, and the direction of the external pressure difference changes based on the state changes of the molten salt thermal storage system; When the molten salt thermal storage system is in a salt-free state, the external pressure difference and the internal pressure difference are in opposite directions, and the external pressure difference is greater than the internal pressure difference, which drives the outside air through the air drying device to enter the molten salt thermal storage system. When the molten salt thermal storage system is in operation, the external pressure difference and the internal pressure difference are in the same direction, which together drive the internal hot air through the air drying device to be discharged to the outside, and dry and restore the water removal component 6 in the water removal chamber 1.

[0058] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An air drying device for a molten salt thermal storage system, characterized by, The application relates to an air drying device. The air drying device comprises: a water removal chamber (1) for communicating with external air, wherein a water removal assembly (6) is arranged in the water removal chamber (1); a heating chamber (2) communicating with the water removal chamber (1), wherein the heating chamber (2) is connected with a molten salt pipeline (3) through a connecting pipeline (7) to form an external pressure difference at two ends of the air drying device; a thermoelectric generator (4) having one end connected with the molten salt pipeline (3) and the other end in contact with the external air to generate a temperature difference between the two ends of the thermoelectric generator (4); 2. The air drying device for a molten salt thermal storage system according to claim 1, wherein a thermoelectric refrigerator (5) electrically connected with the thermoelectric generator (4), wherein a cold end of the thermoelectric refrigerator (5) is connected with the water removal chamber (1) and a hot end of the thermoelectric refrigerator (5) is connected with the heating chamber (2) to form an internal pressure difference of the air drying device between the heating chamber (2) and the water removal chamber (1).

3. The air drying device for a molten salt thermal storage system of claim 1, wherein, A first heat exchange fin (21) is arranged on an inner wall of the heating chamber (2) connected with one side of the thermoelectric refrigerator (5), and a second heat exchange fin (23) is arranged on the heating chamber (2) near the connecting pipeline (7) and / or in the connecting pipeline (7).

4. The air drying device for a molten salt thermal storage system of claim 1, wherein, A baffle (22) is further arranged in the heating chamber (2) to guide the flow of air in the heating chamber (2).

5. The air drying device for a molten salt thermal storage system of claim 1, wherein, The connecting pipeline (7) is used for connecting the heating chamber (2) and the molten salt pipeline (3) from top to bottom, and the corresponding top parts of the heating chamber (2) and the connecting pipeline (7) along the gravity direction are configured as right top parts, and the height of the right top part is smaller than that of the left top part.

6. The air drying device for a molten salt thermal storage system of claim 1, wherein, A transition pipeline (8) is further arranged to connect the water removal chamber (1) and the heating chamber (2), and the transition pipeline (8) is at least partially arranged between the heating chamber (2) and the molten salt pipeline (3). The water removal assembly (6) comprises: a hydrophobic membrane (61) arranged in the water removal chamber (1) to block liquid water; 7. The air drying device for a molten salt thermal storage system of claim 6, wherein, a capillary adsorption water removal layer (62) arranged in the water removal chamber (1) to adsorb free water and aerosol water. The water removal assembly (6) comprises: a condensing pipe (631) communicating with the water removal chamber (1), wherein the condensing pipe (631) is connected with an inner wall of one side of the water removal chamber (1) near a cold end of the thermoelectric refrigerator (5) to condense water in air into liquid water; a water absorption unit (632) arranged in the water removal chamber (1) to absorb liquid water on the condensing pipe (631); wherein the outlet of the condensing pipe (631) and the water absorption unit (632) are sequentially arranged in communication along the gravity direction to naturally flow the liquid water condensed on the condensing pipe (631) into the water absorption unit (632).

8. The air drying device for a molten salt thermal storage system of claim 7, wherein, The water removal assembly (6) further comprises a refrigeration shell (633) connected with the inner wall of the water removal chamber (1) near the side of the cold end of the thermoelectric refrigerator (5), the refrigeration shell (633) has a cold conducting material (634) therein, and the condensing pipe (631) is located in the refrigeration shell (633) and is wrapped by the cold conducting material (634).

9. The air drying device for a molten salt thermal storage system of claim 7, wherein, The hydrophobic membrane (61), the capillary adsorption water removal layer (62), the condensing pipe (631) and the water absorbing unit (632) are arranged in sequence along the path of the external air flowing into the air drying device.

10. A method of air intake and exhaust for an air drying apparatus as claimed in any one of claims 1 to 9, characterised in that, The air drying device comprises: The air drying device is used to be installed in a molten salt heat storage system to form an internal pressure difference of the air drying device between the heating chamber (2) and the water removal chamber (1) and to form an external pressure difference at both ends of the air drying device; The air flow direction formed by the internal pressure difference is from the heating chamber (2) to the water removal chamber (1), and the direction of the external pressure difference changes based on the state of the molten salt heat storage system; When the molten salt heat storage system is in a salt-free state, the direction of the external pressure difference is opposite to that of the internal pressure difference, and the external pressure difference is greater than the internal pressure difference, so as to drive the external air to pass through the air drying device to enter the molten salt heat storage system; When the molten salt heat storage system is in a working state, the direction of the external pressure difference is the same as that of the internal pressure difference, so as to jointly drive the internal hot air to pass through the air drying device to be discharged to the outside and to dry and recover the water removal assembly (6) in the water removal chamber (1).

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