Molten salt heat storage tank and working method thereof

Abstract

The invention belongs to the technical field of fused salt heat storage, and particularly discloses a fused salt heat storage tank and a working method thereof. Wherein the fused salt heat storage tank comprises a tank body which is arranged on a base in a sliding manner; a placing cavity, a heating cavity and a circulating cavity are formed in the tank body; the placing cavity is communicated with the circulating cavity through the connecting port and the blanking port, a heating device is arranged in the heating cavity, and a stirring rod is arranged in the placing cavity; a circulating conveying device is arranged in the circulating cavity, and is used for conveying the fused salt input into the circulating cavity through the connecting port in the circulating cavity and sending the fused salt back to the placing cavity through the blanking port; a first driving device for driving the tank body to slide on the base is arranged on the base, and a second driving device for driving the stirring rod and the circulating conveying device is arranged on the tank body. According to the technical scheme, molten salt can be heated more uniformly, and the heat storage capacity and the heat storage efficiency can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of molten salt thermal energy storage, and particularly relates to a molten salt thermal energy storage tank and its working method. Background Art

[0002] As an efficient thermal energy storage and transmission solution, molten salt thermal energy storage technology has wide application value in the fields of solar thermal power generation, industrial waste heat utilization, and new energy energy storage. Its core lies in using molten inorganic salts (i.e., molten salt) as the heat transfer and thermal energy storage medium, and achieving efficient storage and release of thermal energy through its high specific heat capacity, low vapor pressure, and good thermal stability. Exemplarily, existing molten salt systems are usually composed of combinations of cations and anions such as halides (such as Cl + , Na + , K + ) of alkali metals (such as Li 2+ , Ca 2+ ) of alkaline earth metals (such as Mg - , F - ), nitrates (NO3 - ), and sulfates (SO4 2- ), etc., which can form more than 2,400 molten salt formulations with specific physical and chemical properties to meet the thermal energy storage requirements in different temperature ranges.

[0003] Currently, the design principle of existing traditional molten salt thermal energy storage tanks is: an electric heater or a heat exchanger is arranged inside the tank, and the molten salt is gradually heated to the molten state and kept at a constant temperature through heat conduction; there are still some defects in the above existing traditional molten salt thermal energy storage tanks, including: during the thermal energy storage process, the molten salt is in a relatively static state, and there is a problem of uneven heating of the molten salt; under long-term operation, the flow pattern of the molten salt inside the tank solidifies, and it is easy to form dead corners of heat and mass transfer. Further explanatorily, due to the relatively high viscosity of the molten salt (especially in the low-temperature region), it is easy to form a stable temperature stratification, resulting in local overheating in the area where the bottom of the tank contacts the heater, while the temperature in the edge and upper regions far from the heater is relatively low.

[0004] Existing improvement schemes, such as built-in flow guiding plates, serpentine heating pipes, etc., although they can enhance the disturbance to a certain extent, have problems such as complex structure, difficult maintenance, increased flow resistance, etc., and do not fundamentally solve the inherent defect of thermal stratification caused by static thermal energy storage. Summary of the Invention

[0005] The purpose of the present invention is to provide a molten salt thermal energy storage tank and its working method to solve one or more of the above existing technical problems. The technical solution disclosed by the present invention is specifically a new type of thermal energy storage tank structure that can actively strengthen the flow of molten salt and promote the homogenization of heat and mass, which can make the molten salt heated more evenly and improve the thermal energy storage capacity and efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a molten salt heat storage tank, comprising: a base and a tank body; wherein,

[0008] The tank body is slidably arranged on the base;

[0009] A placement cavity for filling molten salt, a heating cavity for heating the molten salt, and a circulation cavity for circulating and transporting the molten salt are arranged in the tank body; wherein, the placement cavity is communicated with the circulation cavity through a connection port and a blanking port, and the connection port is located below the blanking port; a heating device is arranged in the heating cavity; a stirring rod is arranged in the placement cavity; a circulation transport device is arranged in the circulation cavity; the circulation transport device is used for transporting the molten salt input into the circulation cavity through the connection port in the circulation cavity and sending it back to the placement cavity through the blanking port; a molten salt inlet and a molten salt outlet are arranged in the placement cavity;

[0010] A first driving device for driving the tank body to slide on the base is arranged on the base; a second driving device for driving the stirring rod and the circulation transport device is arranged on the tank body.

[0011] Further improvement of the technical solution of the present invention lies in that a chute is arranged on the base, and the tank body is slidably arranged in the chute through a support plate.

[0012] Further improvement of the technical solution of the present invention lies in that an elastic member is arranged between the support plate and the side wall of the chute.

[0013] Further improvement of the technical solution of the present invention lies in that the first driving device comprises: a mounting frame, a driving rod, a turntable, a connecting rod and a driving component;

[0014] Wherein, the driving component is mounted on the base through the mounting frame, the output end of the driving component is provided with the driving rod, the driving rod is mounted with the turntable, the turntable is eccentrically rotatably connected with the connecting rod, and one end of the connecting rod far away from the turntable is hinged with the support plate.

[0015] Further improvement of the technical solution of the present invention lies in that the circulation transport device comprises: a transport shaft and spiral blades arranged on the transport shaft;

[0016] Wherein, the transport shaft can drive the spiral blades to rotate under the drive of the second driving device to realize the transport of the molten salt in the circulation cavity from the connection port to the blanking port.

[0017] A further improvement of the technical solution of the present invention lies in that the second driving device includes: a connecting frame, a biaxial motor, a first driving shaft and a second driving shaft;

[0018] Wherein, the biaxial motor and the connecting frame are both arranged on the tank body; the output ends of the biaxial motor are respectively provided with the first driving shaft and the second driving shaft; the first driving shaft extends into the placement cavity, the first driving shaft is rotatably connected to the housing, and a plurality of the stirring rods are arranged on the part of the first driving shaft in the placement cavity; the second driving shaft is provided with a driven shaft through a connecting unit, one end of the driven shaft is rotatably connected to the connecting frame, the other end of the driven shaft extends into the circulation cavity and is connected to the conveying shaft, the driven shaft is rotatably connected to the housing, and the end of the conveying shaft away from the driven shaft is rotatably connected to the bottom wall of the circulation cavity.

[0019] A further improvement of the technical solution of the present invention lies in that a scraper is arranged at one end of the stirring rod away from the first driving shaft, and the scraper is attached to the inner wall of the placement cavity.

[0020] A further improvement of the technical solution of the present invention lies in that it further includes: a connecting mechanism, a blanking rod and a transmission rod;

[0021] Wherein, the connecting mechanism is installed on the first driving shaft, the end of the connecting mechanism away from the first driving shaft is connected to the transmission rod, the blanking rod is arranged on the transmission rod, and the blanking rod is arranged above the connecting port.

[0022] A further improvement of the technical solution of the present invention lies in that the bottom surface of the placement cavity is inclined, and the connecting port is arranged at the lowest point of the bottom surface of the placement cavity.

[0023] The present invention provides a working method of a molten salt heat storage tank, including:

[0024] Filling molten salt into the placement cavity through the molten salt inlet of the placement cavity, heating the molten salt in the placement cavity by the heating device in the heating cavity, and after the molten salt is heated to a preset temperature, outputting the heated molten salt through the molten salt outlet of the placement cavity;

[0025] Wherein, during the heating process, the tank body is driven to slide on the base by the first driving device, so that the molten salt in the placement cavity shakes; the stirring rod is driven to rotate by the second driving device to stir the molten salt in the placement cavity; the circulation conveying device is driven by the second driving device, so that the molten salt in the placement cavity enters the circulation cavity through the connecting port, and then returns to the placement cavity through the circulation conveying device and the blanking port to turn over the molten salt in the placement cavity.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention specifically discloses a novel heat storage tank structure that can actively strengthen the molten salt flow and promote heat and mass homogenization, enabling the molten salt to be heated more evenly, improving the heat storage capacity and efficiency, breaking through the performance bottleneck of traditional heat storage devices, and meeting the engineering requirements of large-scale and long-term heat storage systems. Specifically, the present invention is provided with a first driving device for driving the tank body to slide on the base, and the sliding of the tank body generates overall shaking, breaking the static stratification of the molten salt and promoting the macroscopic mixing of the molten salt in different temperature regions in the tank, solving the existing static heat storage defect; the present invention is provided with a second driving device for driving the stirring rod and the circulation conveying device. The rotation of the stirring rod can improve the temperature uniformity, and the circulation conveying device forms a lifting and tumbling cycle of the molten salt. The circulation path design avoids eddy dead zones, further improving the heat and mass transfer efficiency. Summarizing, the technical solution of the present invention adopts a design scheme of active mechanical disturbance and forced circulation flow, achieving a breakthrough from passive dependence on thermal buoyancy to active mechanical drive and a breakthrough from single disturbance to multi-field collaboration, enabling the molten salt to be heated more evenly, improving the heat storage capacity and efficiency, and solving the problems existing in the current heat storage.

[0028] In a preferred embodiment of the present invention, a dual-axis motor drives the stirring rod and the circulation conveying device simultaneously, and a scraper is integrated at the end of the stirring rod; the scraper fits against the inner wall of the placement cavity to remove the attached molten salt layer, solving the problem of low-temperature dead zones at the edges; the dual-axis design reduces the number of independent driving components, reducing the maintenance complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a molten salt heat storage tank.

[0031] Figure 2 It is a schematic structural diagram of the stirring rod in a molten salt heat storage tank.

[0032] Figure 3 It is a schematic structural diagram of the turntable in a molten salt heat storage tank.

[0033] Figure 4 It is a schematic structural diagram of the connecting mechanism in a molten salt heat storage tank.

[0034] Figure 5 It is a schematic structural diagram of the spiral blade in a molten salt heat storage tank.

[0035] The explanations of the reference numerals in the figure are as follows: 1, base; 2, mounting frame; 3, chute; 4, support plate; 5, tank body; 6, circulation chamber; 7, heating chamber; 8, heating pipe; 9, placement chamber; 10, connection port; 11, conveying shaft; 12, first drive shaft; 13, dual-shaft motor; 14, connecting frame; 15, second drive shaft; 16, driven shaft; 17, connecting unit; 18, spiral blade; 19, stirring rod; 20, connecting mechanism; 21, blanking rod; 22, transmission rod; 23, discharge pipe; 24, drive rod; 25, turntable; 26, connecting rod; 27, drive component; 28, blanking port; 29, scraper. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiment technical solutions are a part of the embodiments of the present invention, rather than all of the embodiments.

[0037] 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 making creative efforts shall fall within the protection scope of the present invention. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] Please refer to Figures 1 to 5 , in an embodiment of the present invention, a molten salt heat storage tank includes a base 1 and a tank body 5; wherein,

[0039] The tank body 5 is slidably arranged on the base 1; in a preferred specific example, a chute 3 is formed on the base 1, a support plate 4 is slidably installed in the chute 3, and one end of the support plate 4 away from the chute 3 is connected to the tank body 5; further, an elastic member is arranged between the support plate 4 and the side wall of the chute 1.

[0040] A placement cavity 9 is provided in the tank body 5, and a heating cavity 7 and a circulation cavity 6 are formed on the side wall of the tank body 5; wherein, a heating pipe 8 serving as a heating device is installed in the heating cavity 7, a connection port 10 is formed at the bottom of the placement cavity 9, the connection port 10 communicates with the circulation cavity 6, a blanking rod 21 is further arranged on one side of the connection port 10, a blanking port 28 is arranged at the top of the circulation cavity 6, and the blanking port 28 communicates with the placement cavity 9; a circulation conveying device is arranged in the circulation cavity 6, and a stirring rod 19 is arranged in the placement cavity 9; a molten salt discharge port is arranged at the bottom of the tank body 5, a discharge pipe 23 is arranged at the molten salt discharge port, and a control valve is installed in the discharge pipe 23; in a preferred technical solution of the embodiment of the present invention, one end of the stirring rod 19 away from the first driving shaft 12 is connected with a scraping plate 29, and one end of the scraping plate 29 away from the stirring rod 19 is attached to the inner wall of the placement cavity 9.

[0041] In a specific embodiment of the present invention, a first driving device for driving the tank body 5 to slide on the base 1 is arranged on the base 1; wherein, the first driving device includes: a mounting frame 2, a driving rod 24, a turntable 25, a connecting rod 26 and a driving component 27;

[0042] Wherein, a mounting frame 2 is installed on the base 1, a power component is installed on the mounting frame 2, the power component includes a driving component 27, the driving component 27 is installed on the mounting frame 2, a driving rod 24 is installed at the output end of the driving component 27, one end of the driving rod 24 away from the driving component 27 is connected with a turntable 25, a connecting rod 26 is eccentrically rotatably connected to the turntable 25, and one end of the connecting rod 26 away from the turntable 25 is hinged to the support plate 4.

[0043] In a specific embodiment of the present invention, a second driving device for driving the stirring rod 19 and the circulation conveying device is arranged on the tank body 5; wherein,

[0044] A connecting frame 14 is installed on the tank body 5, a driving component is installed on the connecting frame 14, the driving component includes a dual-axis motor 13, the dual-axis motor 13 is installed on the tank body 5, a first driving shaft 12 and a second driving shaft 15 are installed at the output end of the dual-axis motor 13, the first driving shaft 12 extends into the placement cavity 9, and the stirring rod 19 is installed on the first driving shaft 12;

[0045] A transmission component is installed on the tank body 5, the transmission component includes a driven shaft 16, one end of the driven shaft 16 is rotatably connected to the connecting frame 14, the other end extends into the circulation cavity 6, a conveying shaft 11 is connected to the driven shaft 16, one end of the conveying shaft 11 away from the driven shaft 16 is rotatably connected to the bottom wall of the circulation cavity 6, a spiral blade 18 is installed on the conveying shaft 11, and a connecting unit 17 is installed on the second driving shaft 15, and one end of the connecting unit 17 away from the second driving shaft 15 is connected to the driven shaft 16.

[0046] In a specific embodiment of the present invention, a transmission mechanism is provided in the tank body 5. The transmission mechanism includes a transmission rod 22. One end of the transmission rod 22 is rotatably connected to the side wall of the tank body 5. The blanking rod 21 is installed on the transmission rod 22. A connection mechanism 20 is installed on the first drive shaft 12. One end of the connection mechanism 20 away from the first drive shaft 12 is connected to the transmission rod 22.

[0047] The working principle of the technical solution of the embodiment of the present invention is as follows: When the device stores heat, when the heating tube 8 provided heats the molten salt in the placement cavity 9, the installed double-shaft motor 13 drives the connected first drive shaft 12 and second drive shaft 15 to rotate. The rotation of the first drive shaft 12 drives the connected stirring rod 19 to rotate to stir the molten salt, so that the molten salt is heated evenly. During this process, the first drive shaft 12 drives the connected transmission rod 22 to rotate through the connection mechanism 20. The rotation of the transmission rod 22 drives the blanking rod 21 to rotate. The rotation of the blanking rod 21 enables the molten salt to flow to the side of the connection port 10 faster. The set second drive shaft 15 drives the connected driven shaft 16 to rotate. The rotation of the driven shaft 16 drives the conveying shaft 11 to rotate. The rotation of the conveying shaft 11 drives the connected spiral blade 18 to rotate. The rotation of the spiral blade 18 enables the molten salt at the bottom to enter the circulation cavity 6 from the feed port, and then is conveyed to the top by the spiral blade 18 and falls into the placement cavity 9 through the blanking port 28. In this way, the molten salt inside is continuously turned over, and the stirring of the stirring rod 19 makes the molten salt heated more evenly. At the same time, the installed driving component 27 drives the connected driving rod 24 to rotate. The rotation of the driving rod 24 drives the turntable 25 to rotate. The rotation of the turntable 25 drives the support plate 4 at one end to reciprocate through the connecting rod 26. The support plate 4 drives the tank body 5 to reciprocate and shake, so that the molten salt inside is continuously shaken, making the molten salt heated more evenly. The set elastic component can buffer the inertia of the tank body 5 during the shaking process. The set scraper 29 can scrape off the molten salt attached to the inner wall of the tank body 5 to ensure heat conduction, and further improves the heat storage capacity and heat storage efficiency.

[0048] In the technical solution of the embodiment of the present invention, through the composite design of dynamic disturbance and forced circulation, the core defects of traditional molten salt heat storage tanks are systematically solved. Among them, the first driving device drives the tank body to reciprocate in the chute through an eccentric wheel mechanism, generating macroscopic shaking, which can break the static stratification of molten salt and promote the overall mixing of molten salt in different temperature regions in the tank. Compared with traditional static heat storage, the temperature uniformity can be significantly improved. The double-axis motor drives the stirring rod to generate radial flow, and cooperates with the scraper to remove the molten salt attached to the wall surface, which can eliminate the low-temperature area at the edge and inhibit local overheating. The spiral blade in the circulation cavity forces the molten salt to be transported from the connection port to the blanking port, forming a large axial circulation. By turning the molten salt, the uniformity and efficiency can be further improved. Summarily, aiming at the problems such as temperature stratification caused by static heat storage in the traditional scheme, the technical solution of the present invention adopts three dynamic disturbance means: the sliding of the tank body, the stirring of the stirring rod, and the circulating transportation in the circulation cavity, converting static heat conduction into dynamic heat convection, completely changing the passive mode of traditional heat storage tanks relying on natural convection, and providing a subversive technical upgrade path for fields such as solar thermal power generation and industrial waste heat utilization.

[0049] In the specific exemplary technical solution of the present invention, the connecting unit 17 can be a gear set or a pulley set, etc., and no specific description is made here.

[0050] In the specific exemplary technical solution of the present invention, the connecting mechanism 20 can be a gear set or the cooperation of a worm and a worm wheel, and no specific description is made here.

[0051] In the specific exemplary technical solution of the present invention, the driving component 27 and the driving member can both be a stepping motor or a servo motor, etc., and no specific description is made here.

[0052] In the specific exemplary technical solution of the present invention, the elastic component can be a spring or an elastic film, etc., and no specific description is made here.

[0053] In summary, the embodiment of the present invention discloses a molten salt heat storage tank, including a base, a stirring rod, a heating pipe, a driving assembly, a transmission assembly, a power assembly and a transmission mechanism. When storing heat, when the heating pipe arranged heats the molten salt in the placement cavity, the driving assembly drives the stirring rod to rotate to stir the molten salt, so that the molten salt is heated evenly. The driving assembly drives the blanking rod and the spiral blade to rotate. The rotation of the blanking rod enables the molten salt to flow to the side of the connection port faster. The rotation of the spiral blade enables the molten salt at the bottom to enter the circulation cavity from the feed port, and then is transported to the top through the spiral blade and falls into the placement cavity through the blanking port. In this way, the molten salt inside is continuously turned, and combined with the stirring of the stirring rod, the molten salt is heated more evenly. At the same time, the power assembly drives the tank body to shake reciprocally, so that the molten salt inside shakes continuously, making the molten salt heated more evenly and ensuring the conduction of heat, further improving the heat storage capacity and heat storage efficiency.

[0054] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Thus, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved. In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A molten salt heat storage tank, characterized in that, Comprising: A base (1) and a tank body (5); wherein, The tank body (5) is slidably arranged on the base (1); A placement cavity (9) for filling molten salt, a heating cavity (7) for heating the molten salt, and a circulation cavity (6) for circulating and conveying the molten salt are arranged in the tank body (5); wherein, the placement cavity (9) is communicated with the circulation cavity (6) through a connection port (10) and a blanking port (28), and the connection port (10) is located below the blanking port (28); a heating device is arranged in the heating cavity (7); a stirring rod (19) is arranged in the placement cavity (9); a circulation conveying device is arranged in the circulation cavity (6); the circulation conveying device is used for conveying the molten salt input into the circulation cavity (6) through the connection port (10) in the circulation cavity (6) and sending it back to the placement cavity (9) through the blanking port (28); the placement cavity (9) is provided with a molten salt inlet and a molten salt outlet; A first driving device for driving the tank body (5) to slide on the base (1) is arranged on the base (1); a second driving device for driving the stirring rod (19) and the circulation conveying device is arranged on the tank body (5).

2. The molten salt heat storage tank according to claim 1, characterized in that A chute (3) is arranged on the base (1), and the tank body (5) is slidably arranged in the chute (3) through a support plate (4).

3. The molten salt heat storage tank according to claim 2, characterized in that, An elastic member is arranged between the support plate (4) and the side wall of the chute (3).

4. A molten salt heat storage tank according to claim 2, characterized in that, The first driving device includes: a mounting frame (2), a driving rod (24), a turntable (25), a connecting rod (26), and a driving component (27); Wherein, the driving component (27) is mounted on the base (1) through the mounting frame (2), the output end of the driving component (27) is provided with the driving rod (24), the driving rod (24) is mounted with the turntable (25), the turntable (25) is eccentrically rotatably connected with the connecting rod (26), and one end of the connecting rod (26) far away from the turntable (25) is hinged to the support plate (4).

5. A molten salt heat storage tank according to claim 1, characterized in that, The circulation conveying device includes: a conveying shaft (11) and a spiral blade (18) arranged on the conveying shaft (11); Wherein, the conveying shaft (11) can drive the spiral blade (18) to rotate under the drive of the second driving device, so as to realize the conveying of the molten salt in the circulation cavity (6) from the connection port (10) to the blanking port (28).

6. A molten salt heat storage tank according to claim 5, characterized in that, The second driving device includes: a connecting frame (14), a double-shaft motor (13), a first driving shaft (12), and a second driving shaft (15); Among them, the biaxial motor (13) and the connecting frame (14) are both arranged on the tank body (5); the output ends of the biaxial motor (13) are respectively provided with the first driving shaft (12) and the second driving shaft (15); the first driving shaft (12) extends into the placing cavity (9), the first driving shaft (12) is rotatably connected to the housing, and a plurality of stirring rods (19) are arranged on the part of the first driving shaft (12) in the placing cavity (9); the second driving shaft (15) is provided with a driven shaft (16) through a connecting unit (17), one end of the driven shaft (16) is rotatably connected to the connecting frame (14), the other end of the driven shaft (16) extends into the circulation cavity (6) and is connected to the conveying shaft (11), the driven shaft (16) is rotatably connected to the housing, and one end of the conveying shaft (11) away from the driven shaft (16) is rotatably connected to the bottom wall of the circulation cavity (6).

7. A molten salt heat storage tank according to claim 6, characterized in that, A scraper (29) is arranged at one end of the stirring rod (19) away from the first driving shaft (12), and the scraper (29) is attached to the inner wall of the placing cavity (9).

8. A molten salt heat storage tank according to claim 6, characterized in that, It further includes: a connecting mechanism (20), a blanking rod (21) and a transmission rod (22); Among them, the connecting mechanism (20) is installed on the first driving shaft (12), one end of the connecting mechanism (20) away from the first driving shaft (12) is connected to the transmission rod (22), the blanking rod (21) is arranged on the transmission rod (22), and the blanking rod (21) is arranged above the connecting port (10).

9. The molten salt heat storage tank according to claim 1, characterized in that, The bottom surface of the placing cavity (9) is inclined, and the connecting port (10) is arranged at the lowest position of the bottom surface of the placing cavity (9).

10. A working method of the molten salt heat storage tank according to claim 1, characterized in that, It includes: Filling molten salt into the placing cavity (9) through the molten salt inlet of the placing cavity (9), and heating the molten salt in the placing cavity (9) by a heating device in the heating cavity (7); after the molten salt is heated to a preset temperature, the heated molten salt is output through the molten salt outlet of the placing cavity (9). Among them, during the heating process, the tank body (5) is driven to slide on the base (1) by a first driving device, so that the molten salt in the placing cavity (9) shakes; the stirring rod (19) is driven to rotate by a second driving device to stir the molten salt in the placing cavity (9); the circulation and conveying device is driven by a second driving device, so that the molten salt in the placing cavity (9) enters the circulation cavity (6) through the connecting port (10), and then returns to the placing cavity (9) through the circulation and conveying device and the blanking port (28) to turn over the molten salt in the placing cavity (9).

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