Groove type fused salt heat storage device and working method thereof

Abstract

The invention belongs to the technical field of fused salt heat storage, and discloses a groove type fused salt heat storage device and a working method thereof. The groove type fused salt heat storage device comprises a hot flow groove, a heat storage tank and a circulating water supplementing assembly. The heat storage tank is fixedly mounted on the outer wall of the hot flow groove; a fixing frame is fixedly arranged in the heat storage tank, a polymeric membrane is fixedly arranged in the fixing frame, multiple sets of heat conduction blocks fixedly connected to the outer wall of the hot flow groove are arranged in the polymeric membrane, and threaded guide grooves are formed in the heat conduction blocks; the threaded guide groove is provided with a heating medium inlet and a heating medium outlet, the heating medium inlet is used for inputting a to-be-heated heating medium, and the heating medium outlet is communicated with a heat discharge port formed in the heat storage tank; dehydrated inorganic salt is filled between the polymeric membrane and the outer wall of the hot flow tank; the circulating water replenishing assembly is used for replenishing water to the dehydrated inorganic salt. According to the technical scheme, the molten salt can be prevented from being cooled and solidified, and the accident that the molten salt flows through the pipeline locally or even completely frozen and blocked can be effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of molten salt heat storage, and particularly relates to a trough-type molten salt heat storage device and its working method. Background Art

[0002] Molten salt heat storage is an efficient sensible heat storage technology, and its core lies in using the temperature difference of molten salt materials during heating or cooling to achieve effective storage and release of thermal energy. Exemplarily, a molten salt heat storage system generally consists of key components such as a heater, a cold / hot storage tank, pipelines, and a heat exchanger; during the heat storage stage, electrical energy or other forms of thermal energy are transferred to the molten salt through the heater, causing its temperature to rise and store thermal energy; during the heat release stage, the high-temperature molten salt transfers thermal energy to water or other working fluids through the heat exchanger to generate steam or hot water for power generation, heating, or other industrial applications.

[0003] In a molten salt heat storage system, molten salt serves as a carrier for energy conversion and needs to remain in a liquid state throughout the working temperature range to ensure the normal operation of the system. Molten salt has excellent properties such as high density, high specific heat capacity, low vapor pressure, and low viscosity at high temperatures, making it an ideal heat storage material; however, molten salt heat storage technology still faces some challenges in practical applications, especially the problem of treating cold molten salt after the exothermic reaction. Further specifically, during the molten salt heat storage process, the cold molten salt after the reaction has already experienced heat loss, and its temperature has decreased; during the transmission process, the cold molten salt exchanges heat with the external environment and is prone to solidification after further cooling (exemplarily, the freezing point of molten salt is generally between 120°C and 240°C, much higher than the ambient temperature). Therefore, in the case of insufficient sunlight or system failure and shutdown, due to excessive heat dissipation loss, local or even complete blockage accidents may occur when the molten salt flows through the pipeline.

[0004] Local or even complete blockage accidents of the molten salt flowing through the pipeline will lead to a series of serious consequences, mainly including: (1) System shutdown and increased maintenance costs; Exemplarily, the solidification of molten salt will cause pipeline blockage, making the entire heat storage system unable to operate normally; to restore system operation, it is necessary to cut or dredge the solidified molten salt, which is not only time-consuming and laborious but also significantly increases the maintenance cost of the system.

[0005] (2) Increased safety risks; Exemplarily, after the molten salt solidifies, during the thawing process, due to the volume expansion of the molten salt or improper operation, the pipeline may undergo permanent plastic deformation and bending, even leading to safety accidents; in addition, although the chemical properties of molten salt are stable at high temperatures, the physical changes that may occur during the solidification process may also damage the system equipment.

[0006] (3)Energy waste and efficiency reduction; explanatorily, the solidification of molten salt causes the system to shut down, making the originally stored thermal energy unable to be released and utilized in time, resulting in energy waste; meanwhile, additional energy is required to maintain the basic operation of the system or perform thawing during the system shutdown period, further reducing the overall efficiency of the system.

[0007] (4)Shortening of system life; explanatorily, the frequent solidification and thawing processes of molten salt will cause fatigue damage to pipelines and equipment, shortening the service life of the system. In the long run, this will increase the replacement and maintenance costs of the system and reduce the economy of the system.

[0008] In view of the above serious consequences, in order to prevent local or even complete freezing blockage accidents from occurring when molten salt flows through pipelines, electric tracing devices and other means are usually used in existing technical solutions to heat and insulate molten salt pipelines to prevent molten salt from solidifying; however, although the above existing means are effective, they will increase the energy consumption and operating costs of the system. Therefore, researching more efficient and economical molten salt anti-solidification technology is still one of the important directions for the development of current molten salt thermal energy storage technology. Summary of the Invention

[0009] The purpose of the present invention is to provide a trough-type molten salt thermal energy storage device and its working method to solve one or more of the above existing technical problems. In the technical solution disclosed by the present invention, a heat storage tank is arranged outside the heat flow trough, and the heat in the molten salt is converted through the setting of dehydrated inorganic salts, which can prevent the molten salt from cooling and solidifying, and can effectively avoid the occurrence of local or even complete freezing blockage accidents when the molten salt flows through the pipeline.

[0010] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a trough-type molten salt thermal energy storage device, including: a heat flow trough, a heat storage tank, and a circulating water replenishment component; wherein, The heat storage tank is fixedly installed on the outer wall of the heat flow trough; A fixing frame is fixedly arranged inside the heat storage tank, a polymer membrane is fixedly arranged inside the fixing frame, multiple groups of heat conduction blocks fixedly connected to the outer wall of the heat flow trough are arranged inside the polymer membrane, and a threaded guide groove is arranged inside the heat conduction block; a heat medium inlet and a heat medium outlet are arranged in the threaded guide groove, the heat medium inlet is used for inputting the heat medium to be heated, and the heat medium outlet is communicated with the heat discharge port arranged on the heat storage tank; dehydrated inorganic salts are filled between the polymer membrane and the outer wall of the heat flow trough; The circulating water replenishment component is used for replenishing water to the dehydrated inorganic salts; Among them, the dehydrated inorganic salt is used to absorb the heat of the molten salt conveyed by the heat flow tank and store it in the form of chemical energy when the first preset condition is met; the dehydrated inorganic salt is also used to replenish water and release heat through the circulating water replenishing component when the second preset condition is met, so as to heat the heat medium in the threaded guide groove or the molten salt in the heat flow tank.

[0011] A further improvement of the present invention lies in that The circulating water replenishing component includes a water supply pipe, a conduit and an insertion pipe arranged in the heat storage tank; Among them, the water supply pipe is used for water supply input; the conduit is provided with a water inlet and a water outlet, the water inlet is communicated with the water supply pipe, and the water outlet is provided with the insertion pipe; the insertion pipe is used for inserting into the dehydrated inorganic salt, and one or more drain ports are arranged on the part of the insertion pipe inserted into the dehydrated inorganic salt.

[0012] A further improvement of the present invention lies in that It further includes: A water guide groove, which is arranged between the polymer membrane and the inner wall of the heat storage tank; the water supply pipe is fixedly arranged in the water guide groove.

[0013] A further improvement of the present invention lies in that The conduit is an arc-shaped conduit, and a plurality of insertion pipes are fixedly connected to the arc-shaped conduit.

[0014] A further improvement of the present invention lies in that It further includes: A water collecting tank, which is arranged at the bottom of the heat storage tank and is used for collecting the waste water or the overflowed water generated during the process of the circulating water replenishing component replenishing water; A water pump, the water inlet end of the water pump is arranged in the water collecting tank, and the water outlet end of the water pump is communicated with the water input port of the water supply pipe.

[0015] A further improvement of the present invention lies in that The water outlet end of the water pump is communicated with the water input port of the water supply pipe through a hose.

[0016] A further improvement of the present invention lies in that It further includes: A temperature sensor, which is used to obtain the temperature of the molten salt in the heat flow tank; A controller, which is used to control the water pump to start when the temperature of the molten salt in the heat flow tank is lower than the first preset temperature threshold, so as to replenish water to the dehydrated inorganic salt through the water pump.

[0017] A further improvement of the present invention lies in that The first preset condition is that the temperature of the molten salt transported in the heat flow tank is higher than the second preset temperature threshold and the heat discharge port is closed.

[0018] A further improvement of the present invention lies in that The second preset condition is that the temperature of the molten salt transported in the heat flow tank is lower than the first preset temperature threshold and the heat discharge port is open or closed.

[0019] The present invention provides a working method for a trough-type molten salt heat storage device, including: When high-temperature molten salt is transported in the heat flow tank and heat needs to be exported, the heat in the high-temperature molten salt is introduced into the threaded guide groove under the transfer of the heat conduction block, the heat medium transported in the threaded guide groove absorbs the heat, and the heat medium that has absorbed the heat is discharged through the opened heat discharge port; When high-temperature molten salt is transported in the heat flow tank and heat export is not required, the heat discharge port is closed and the heat medium stops being transported in the threaded guide groove, the dehydrated inorganic salt is heated by the heat conduction block, and the dehydrated inorganic salt is heated to undergo water analysis and precipitation, storing the heat of the molten salt in the form of chemical energy in the dehydrated inorganic salt; When the temperature of the high-temperature molten salt transported in the heat flow tank is lower than the preset threshold, the dehydrated inorganic salt is replenished with water through the circulating water replenishing assembly, the dehydrated inorganic salt absorbs water and releases heat, and the released heat is transferred to the heat medium in the threaded guide groove through the heat conduction block to achieve heat export, or the released heat is transferred to the molten salt in the heat flow tank through the heat conduction block to heat the molten salt.

[0020] Compared with the prior art, the present invention has the following beneficial effects: In the technical solution provided by the present invention, a heat storage tank is arranged outside the heat flow tank, and dehydrated inorganic salt is arranged in the heat storage tank. Through the arrangement of the dehydrated inorganic salt, the heat in the molten salt is converted (i.e., absorbing and releasing heat timely), the heat in the molten salt can be stored in the form of chemical energy, and when the temperature of the molten salt in the heat flow tank is too low, the molten salt can be supplemented with heat by the heat released from the water replenishment of the dehydrated inorganic salt, thereby preventing the molten salt from cooling and solidifying and improving the practicability of the equipment. Further specifically, in the technical solution of the present invention, the combination of the polymer membrane and the dehydrated inorganic salt enables the heat storage medium to absorb and release more heat during the phase change process, thereby improving the heat storage efficiency. Compared with the molten salt heat storage method in the prior art, the present invention has a higher energy density and heat storage capacity. In addition, since the present invention uses the combination of the polymer membrane and the dehydrated inorganic salt for heat storage, there is no need to use an electric tracing heating device for heating and insulation, reducing energy consumption and maintenance costs; at the same time, the design of the circulating water replenishing assembly also reduces the need for manual water replenishment, further reducing the maintenance costs.

[0021] In the present invention, the combination of the circulating water replenishing component, the water collecting tank, and the water pump can automatically replenish water to the dehydrated inorganic salt and maintain the stability of its heat storage performance. This design improves the automation level and reliability of the system and reduces the need for human intervention. In addition, the present invention improves the utilization rate of water resources through the technical means of circulating water replenishment and reduces the environmental pollution caused by wastewater discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art; obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a trough-type molten salt heat storage device in an embodiment of the present invention; Figure 2 It is a schematic cross-sectional view of a trough-type molten salt heat storage device in an embodiment of the present invention; Figure 3 It is a sectional view of a trough-type molten salt heat storage device in an embodiment of the present invention; Figure 4 It is a sectional view of a trough-type molten salt heat storage device in an embodiment of the present invention; The explanations of the reference numerals in the drawings are as follows: 1, heat flow trough; 2, heat storage tank; 3, heat conduction block; 4, threaded guide groove; 5, heat discharge port; 6, fixing frame; 7, polymer film; 8, dehydrated inorganic salt; 9, water supply pipe; 10, arc-shaped conduit; 11, insertion tube; 12, drain port; 13, water guide groove; 14, water collecting tank; 15, water pump; 16, hose. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; obviously, the described embodiments of the technical solutions are some, but not all, of the embodiments of the present invention.

[0025] Based on the technical solutions disclosed in the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0026] Please refer to Figures 1 to 4 , a trough-type molten salt heat storage device provided by an embodiment of the present invention includes: a heat flow trough 1, a heat storage tank 2, and a circulating water replenishing component; wherein, The heat storage tank 2 is fixedly connected to the outer wall of the heat flow trough 1 and is used to receive and store the heat of the molten salt in the heat flow trough 1; wherein, a fixing frame 6 is fixedly connected inside the heat storage tank 2, a polymer film 7 is fixedly connected inside the fixing frame 6, and a plurality of heat conducting blocks 3 fixedly connected to the outer wall of the heat flow trough 1 are arranged inside the polymer film 7. A threaded guide groove 4 is fixedly arranged inside the heat conducting block 3; the threaded guide groove 4 is provided with a heat medium inlet and a heat medium outlet, and the heat medium outlet is communicated with a heat discharge port 5 arranged on the heat storage tank 2; explanatorily, the heat conducting block 3 is used to conduct the heat in the heat flow trough 1 to the dehydrated inorganic salt 8 inside the polymer film 7; the threaded guide groove 4 discharges heat through the heat discharge port 5 arranged on the heat storage tank 2; The dehydrated inorganic salt 8 is filled between the polymer film 7 and the heat flow trough 1; explanatorily, the polymer film 7 is used to isolate the dehydrated inorganic salt 8 from the inner wall of the heat storage tank 2, and can prevent corrosion or heat loss caused by direct contact; The circulating water replenishing component is used to replenish water to the dehydrated inorganic salt 8; wherein, the dehydrated inorganic salt 8 is used as a heat storage medium and undergoes a phase change after absorbing heat, thereby storing thermal energy. Further specifically explanatorily, the heat in the molten salt is stored in the form of chemical energy. When the temperature of the molten salt in the heat flow channel is too low, the heat released by the water replenishment of the dehydrated inorganic salt can be used to replenish the heat of the molten salt, thereby preventing the molten salt from cooling and solidifying.

[0027] In the technical solution provided by the embodiment of the present invention, a heat storage tank is arranged outside the heat flow tank, and dehydrated inorganic salt is introduced as a heat conversion medium, realizing the efficient conversion and storage of the heat in the molten salt, and significantly improving the practicability and energy efficiency of the equipment. Further explanatorily, in the existing traditional heat storage system, the heat storage tank is often directly placed inside the heat flow tank or adjacent to it. Although this method is simple and direct, there are problems such as large heat loss and inaccurate temperature control. In the present invention, the heat storage tank is arranged outside the heat flow tank, and through the optimized design of the heat exchange structure, the efficient transfer and storage of heat are realized, and at the same time, the heat loss is reduced. Due to its unique physical and chemical properties, dehydrated inorganic salt performs excellently in the heat conversion process. The technical solution of the present invention utilizes the characteristic that dehydrated inorganic salt can absorb and store a large amount of heat under specific conditions, and uses it as a heat conversion medium; among them, when the molten salt absorbs heat, the dehydrated inorganic salt can quickly absorb and store this heat, and convert it into the form of chemical energy; specifically, in the heat conversion process, the dehydrated inorganic salt absorbs the heat in the molten salt through a chemical reaction and stores it; when heat needs to be released, the dehydrated inorganic salt releases the stored heat through a reverse reaction to supplement the heat of the molten salt, so as to maintain the temperature stability of the molten salt. In summary, the present invention uses dehydrated inorganic salt as a heat conversion medium to realize the efficient conversion of heat from physical energy to chemical energy. This conversion mechanism not only improves the heat storage efficiency, but also makes the release of heat more controllable and accurate. In addition, by optimizing the structural design of the heat storage tank and the application of dehydrated inorganic salt, the present invention realizes the efficient storage and release of heat; when the temperature of the molten salt is too low, the dehydrated inorganic salt can quickly release the stored heat to supplement the heat of the molten salt and prevent it from cooling and solidifying. The application of the present invention significantly improves the practicability of the equipment. By precisely controlling the temperature of the molten salt, the equipment can operate stably under a wider range of working conditions, improving the reliability and service life of the equipment. As a heat conversion medium, dehydrated inorganic salt has the advantages of environmental protection, non-toxicity, recyclability, etc. Compared with traditional heat storage materials, the use of dehydrated inorganic salt reduces environmental pollution and waste of resources.

[0028] In a specific embodiment of the present invention, the circulating water replenishing component may specifically include: a water guide groove 13 arranged between the polymer membrane 7 and the inner wall of the heat storage tank 2, a water supply pipe 9 fixedly connected in the water guide groove 13, an arc-shaped conduit 10 fixedly connected to the water supply pipe 9, a plurality of insertion pipes 11 fixedly connected to the arc-shaped conduit 10, the plurality of insertion pipes 11 penetrate through the polymer membrane 7 and are inserted into the dehydrated inorganic salt 8, and a drain port 12 is arranged in the insertion pipe 11 for replenishing water into the dehydrated inorganic salt 8.

[0029] In the prior art, molten salt pipeline systems usually use electric heating devices for heating and insulation to prevent the molten salt from solidifying. However, this method has problems such as high energy consumption and high maintenance costs. The present invention adopts a combination of polymer membranes and dehydrated inorganic salts, and utilizes the characteristics of dehydrated inorganic salts to absorb and release a large amount of heat during the phase change process for heat storage, which not only improves the heat storage efficiency, but also reduces energy consumption and maintenance costs. Dehydrated inorganic salts will gradually lose water during the heat storage process, resulting in a decrease in their heat storage performance. The present invention designs a circulating water replenishment component that can automatically replenish water to the dehydrated inorganic salts to maintain the stability of their heat storage performance. This design solves the problem of the need for manual water replenishment or replacement of heat storage media in the prior art, and improves the automation and reliability of the system.

[0030] In a specific embodiment of the present invention, a water collecting tank 14 is provided at the bottom of the heat storage tank 2. In a further preferred technical solution, a water pump 15 is installed at the bottom of the water collecting tank 14, the water inlet end of the water pump 15 is arranged in the water collecting tank 14, one end of a hose 16 is installed on the water outlet end of the water pump 15, and the other end of the hose 16 is connected to the water supply pipe 9 to form a circulating water replenishment system.

[0031] In the technical solution of the embodiment of the present invention, a water collecting tank is provided at the bottom of the heat storage tank to collect waste water or overflowed water generated during the circulating water replenishment process; at the same time, the water in the water collecting tank is pumped back into the water supply pipe through a water pump to form a circulating water replenishment system. This design not only improves the utilization rate of water resources, but also reduces the pollution of wastewater discharge to the environment.

[0032] An embodiment of the present invention provides a working method of a trough type molten salt heat storage device, The trough-type molten salt heat storage device comprises a heat flow trough 1, a heat storage tank 2, and a circulating water replenishment component; wherein the heat storage tank 2 is fixedly connected to the outer wall of the heat flow trough 1, a fixing frame 6 is fixedly connected inside the heat storage tank 2, a polymer membrane 7 is fixedly connected inside the fixing frame 6, a plurality of groups of heat conduction blocks 3 fixedly connected to the outer wall of the heat flow trough 1 are arranged inside the polymer membrane 7, a threaded guide groove 4 is fixedly connected inside the heat conduction block 3, a heat discharge port 5 is fixedly connected to the threaded guide groove 4 through the heat storage tank 2, and a dehydrated inorganic salt 8 is filled between the polymer membrane 7 and the heat flow trough 1; the circulating water replenishment component is installed inside the polymer membrane 7; The working method specifically includes the following steps: When high-temperature molten salt flows through the heat flow channel 1 and heat needs to be discharged, the heat in the molten salt is transferred into the threaded guide groove 4 by the heat conduction block 3, and the heat is absorbed by the heat medium in the threaded guide groove 4, and the heat medium that has absorbed the heat is discharged through the heat exhaust port 5; When high-temperature molten salt flows through the heat flow tank 1 and heat export is not required, the pumping of the heat medium in the threaded guide groove 4 is stopped, and the dehydrated inorganic salt 8 is heated through the arrangement of the heat conduction block 3. The dehydrated inorganic salt 8 is heated, water in the dehydrated inorganic salt 8 is precipitated, and the precipitated water is filtered out under the filtration of the polymer membrane 7. At this time, the heat of the molten salt is stored in the dehydrated inorganic salt 8 in the form of chemical energy; When the temperature of the high-temperature molten salt flowing through the heat flow tank 1 is lower than the preset threshold, the circulating water replenishing component is controlled to pump the filtered water body into the dehydrated inorganic salt 8 in a circulating manner. The dehydrated inorganic salt 8 absorbs water and releases heat, and the heat is transferred to the threaded guide groove 4 through the heat conduction block 3, so as to export the heat. At the same time, the molten salt in the heat flow tank 1 can also be heated by the heat to prevent the molten salt from solidifying and affecting the use of the heat flow tank.

[0033] In a specific embodiment of the present invention, the circulating water replenishing component includes a water guide groove 13 arranged between the polymer membrane 7 and the inner wall of the heat storage tank 2. A water supply pipe 9 arranged in the water guide groove 13 is fixedly connected in the water guide groove 13. An arc-shaped conduit 10 is fixedly connected to the water supply pipe 9. An insertion pipe 11 is fixedly connected to the arc-shaped conduit 10. The insertion pipe 11 passes through the polymer membrane 7 and is inserted into the dehydrated inorganic salt 8. A drain port 12 is arranged in the insertion pipe 11. A water collecting tank 14 is arranged at the bottom of the heat storage tank 2. A water pump 15 is installed at the bottom of the water collecting tank 14. The water inlet end of the water pump 15 is arranged in the water collecting tank 14. One end of a hose 16 is installed at the water outlet end of the water pump 15. The other end of the hose 16 is connected to the water supply pipe 9; wherein, the circulating water replenishing component guides the water body precipitated in the dehydrated inorganic salt 8 through the arrangement of the water guide groove 13, and guides the water body into the water collecting tank 14 through the water guide groove 13, so that the water collecting tank 14 collects the precipitated water body. Then, the water body in the water collecting tank 14 can be sucked by the water pump 15, pumped into the water supply pipe 9 along the hose 16, injected into the insertion pipe 11 along the arc-shaped conduit 10, and then uniformly injected into the dehydrated inorganic salt 8 along the drain port 12.

[0034] The working principle of the technical solution of the embodiment of the present invention is as follows: When high-temperature molten salt flows through the heat flow tank 1, the heat in the molten salt is introduced into the threaded guide groove 4 under the transfer of the heat conduction block 3. Thus, the heat medium in the threaded guide groove 4 absorbs the heat, and the heat medium that has absorbed the heat is discharged through the heat discharge port 5. Then, when heat export is not required, the present invention stops pumping the heat medium. Thus, the dehydrated inorganic salt 8 is heated through the setting of the heat conduction block 3. The dehydrated inorganic salt 8 is heated, and the water in the dehydrated inorganic salt 8 is precipitated. The precipitated water is filtered out under the filtration of the polymer membrane 7. At this time, the heat of the molten salt is stored in the dehydrated inorganic salt 8 in the form of chemical energy. At the same time, through the setting of the water guide groove 13, the water body precipitated in the dehydrated inorganic salt 8 is diverted, and the water body is introduced into the water collection tank 14 through the water guide groove 13. Thus, the water collection tank 14 collects the precipitated water body. When the present invention releases heat, the water body in the water collection tank 14 can be pumped by the water pump 15, pumped into the water supply pipe 9 along the hose 16, injected into the insertion tube 11 along the arc-shaped conduit 10, and then evenly injected into the dehydrated inorganic salt 8 along the drain port 12. The dehydrated inorganic salt 8 absorbs water and releases heat, and the heat is transferred to the threaded guide groove 4 through the heat conduction block 3, thereby exporting the heat. At the same time, the molten salt in the heat flow tank 1 can also be heated by the heat, so as to prevent the molten salt from solidifying and affecting the use of the heat flow tank 1.

[0035] In a specific embodiment of the present invention, the scheme for water replenishment control based on a temperature sensor and a controller includes: Heat flow tank: used to accommodate and transport molten salt; Heat storage tank: arranged outside the heat flow tank, used to store anhydrous inorganic salt (dehydrated inorganic salt) and convert the heat in the molten salt; Temperature sensor: the probe can be installed in the heat flow tank, used to monitor the temperature of the molten salt in real time and transmit the data to the controller; Controller: receives the data of the temperature sensor and controls the opening and closing of the water pump according to the preset temperature threshold; Water pump: connected to the heat storage tank, used to replenish water to the dehydrated inorganic salt when needed, so as to release heat and replenish heat to the molten salt.

[0036] In the embodiment of the present invention, in the step where the controller receives the data of the temperature sensor and controls the opening and closing of the water pump according to the preset temperature threshold, the first preset temperature threshold can be set as the limit temperature at which the molten salt starts to solidify, and the second preset temperature threshold can be set as the normal working temperature or the safety threshold temperature of the molten salt.

[0037] In summary, the technical solution of the embodiment of the present invention realizes the efficient utilization and management of heat in molten salt through an improved heat conversion mechanism and an efficient heat storage and release technology. The core lies in improving the structural design and using dehydrated inorganic salts as the heat conversion medium, achieving the efficient conversion and storage of heat from physical energy to chemical energy. The application of this technical means significantly improves the practicability and energy efficiency of the equipment and can effectively avoid the occurrence of freezing and blocking accidents.

[0038] 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 them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A trough-type molten salt thermal energy storage device, characterized in that, Comprising: A heat flow tank (1), a heat storage tank (2) and a circulating water replenishing assembly; wherein, The heat storage tank (2) is fixedly installed on the outer wall of the heat flow tank (1); A fixing frame (6) is fixedly arranged in the heat storage tank (2), a polymer film (7) is fixedly arranged in the fixing frame (6), a plurality of heat conduction blocks (3) fixedly connected to the outer wall of the heat flow tank (1) are arranged in the polymer film (7), and a threaded guide groove (4) is arranged in the heat conduction block (3); The threaded guide groove (4) is provided with a heat medium inlet and a heat medium outlet, the heat medium inlet is used for inputting the heat medium to be heated, and the heat medium outlet is communicated with a heat discharge port (5) arranged on the heat storage tank (2); A dehydrated inorganic salt (8) is filled between the polymer film (7) and the outer wall of the heat flow tank (1); The circulating water replenishing assembly is used for replenishing water to the dehydrated inorganic salt (8); Wherein, the dehydrated inorganic salt (8) is used for absorbing the heat of the molten salt conveyed by the heat flow tank (1) and storing it in the form of chemical energy when the first preset condition is satisfied; The dehydrated inorganic salt (8) is also used for replenishing water and releasing heat through the circulating water replenishing assembly when the second preset condition is satisfied, so as to heat the heat medium in the threaded guide groove (4) or the molten salt in the heat flow tank (1).

2. The trough-type molten salt heat storage device according to claim 1, wherein The circulating water replenishing assembly includes a water supply pipe (9), a conduit and an insertion tube (11) arranged in the heat storage tank (2); Wherein, the water supply pipe (9) is used for water supply input; The conduit is provided with a water inlet and a water outlet, the water inlet is communicated with the water supply pipe (9), and the water outlet is provided with the insertion tube (11); The insertion tube (11) is used for inserting into the dehydrated inorganic salt (8), and one or more drainage ports (12) are arranged on the part of the insertion tube (11) inserted into the dehydrated inorganic salt (8).

3. The trough-type molten salt heat storage device according to claim 2, wherein Further comprising: A water guide groove (13) is arranged between the polymer film (7) and the inner wall of the heat storage tank (2); The water supply pipe (9) is fixedly arranged in the water guide groove (13).

4. The trough-type molten salt heat storage device according to claim 2, wherein The conduit is an arc-shaped conduit (10), and a plurality of insertion tubes (11) are fixedly connected to the arc-shaped conduit (10).

5. The trough-type molten salt heat storage device according to claim 2, wherein Further comprising: A water collecting tank (14) is arranged at the bottom of the heat storage tank (2) for collecting waste water or overflowing water generated during the process of the circulating water replenishing assembly replenishing water; A water pump (15), the water inlet end of the water pump (15) is arranged in the water collecting tank (14), and the water outlet end of the water pump (15) is communicated with the water inlet of the water supply pipe (9).

6. The trough-type molten salt heat storage device according to claim 5, wherein The water outlet end of the water pump (15) is connected to the water inlet of the water supply pipe (9) through a hose (16).

7. A trough-type molten salt thermal energy storage device according to claim 5, wherein further comprising: a temperature sensor for obtaining the temperature of the molten salt in the heat flow trough (1); a controller for controlling the water pump (15) to start when the temperature of the molten salt in the heat flow trough (1) is lower than a first preset temperature threshold, so as to replenish water to the dehydrated inorganic salt (8) through the water pump (15).

8. A trough-type molten salt thermal energy storage device according to claim 1, wherein the first preset condition is that the temperature of the molten salt conveyed in the heat flow trough (1) is higher than a second preset temperature threshold and the heat discharge port (5) is closed.

9. A trough-type molten salt thermal energy storage device according to claim 1, wherein the second preset condition is that the temperature of the molten salt conveyed in the heat flow trough (1) is lower than the first preset temperature threshold and the heat discharge port (5) is open or closed.

10. A working method of the trough-type molten salt thermal energy storage device according to claim 1, characterized in that, comprising: When high-temperature molten salt is conveyed in the heat flow trough (1) and heat needs to be exported, the heat in the high-temperature molten salt is introduced into the threaded guide groove (4) under the transfer of the heat conduction block (3), the heat medium conveyed in the threaded guide groove (4) absorbs the heat, and the heat medium that has absorbed the heat is discharged through the opened heat discharge port (5); When high-temperature molten salt is conveyed in the heat flow trough (1) and heat does not need to be exported, the heat discharge port (5) is closed and the heat medium in the threaded guide groove (4) stops being conveyed, and the dehydrated inorganic salt (8) is heated through the heat conduction block (3), and the dehydrated inorganic salt (8) is heated to decompose and release water, and the heat of the molten salt is stored in the dehydrated inorganic salt (8) in the form of chemical energy; When the temperature of the high-temperature molten salt conveyed in the heat flow trough (1) is lower than the preset threshold, water is replenished to the dehydrated inorganic salt (8) through the circulating water replenishing assembly, the dehydrated inorganic salt (8) absorbs water and releases heat, and the released heat is transferred to the heat medium in the threaded guide groove (4) through the heat conduction block (3) to realize heat export or the released heat is transferred to the molten salt in the heat flow trough (1) through the heat conduction block (3) to heat the molten salt.

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