Multidirectional leakage and salt discharge device for molten salt storage tank

Abstract

This invention belongs to the technical field of molten salt storage tanks, and specifically relates to a multi-directional leakage and salt discharge device for molten salt storage tanks. The device includes an insulated foundation structure, a side leakage detection and salt discharge structure, a bottom leakage detection and salt discharge structure, and a salt storage tank. The insulated foundation structure is located at the bottom of the molten salt storage tank. The side leakage detection and salt discharge structure is located around the molten salt storage tank and installed on top of the insulated foundation structure. The salt storage tank is located around the insulated foundation structure. The bottom leakage detection and salt discharge structure is located inside the insulated foundation structure, with one end extending below the molten salt storage tank. The other end of the bottom leakage detection and salt discharge structure and the end of the side leakage detection and salt discharge structure furthest from the molten salt storage tank are both connected to the salt storage tank. This invention provides a multi-directional leakage and salt discharge device for molten salt storage tanks, employing an integrated, all-around molten salt leakage and salt discharge solution. It possesses stable and non-clogging capabilities, timely salt discharge, and molten salt recovery capabilities, and causes no harm to the foundation.

Description

Technical Field

[0001] This invention belongs to the field of molten salt storage tank technology, and specifically relates to a multi-directional leakage and salt discharge device for molten salt storage tanks. Background Technology

[0002] Solar energy, as a widely used clean energy source worldwide, has seen continuous improvements in its development and utilization technologies. However, areas rich in solar thermal resources are often far from densely populated areas. For example, in my country, solar thermal resources are often concentrated in Gansu and Xinjiang, far from load centers, making it difficult for existing power grids to fully absorb them. Therefore, energy storage devices are needed for temporary storage. Molten salt energy storage, due to its large scale, low cost, high energy density, and long heat storage time, is currently widely used in solar thermal power plant projects.

[0003] Because there are currently no design standards worldwide for high-temperature molten salt storage tanks, numerous major accidents caused by tank safety issues have occurred, resulting in significant economic losses. Molten salt leakage is a primary cause of these accidents, and timely detection and repair of damaged areas are urgent issues that need to be addressed. Furthermore, due to its liquid state, molten salt rapidly seeps downwards and contaminates the tank's foundation materials, such as expanded clay aggregate. This causes a sharp increase in the thermal conductivity of the expanded clay layer, leading to a loss of insulation performance in the tank foundation and an increase in ground temperature, potentially causing overheating and safety hazards. Therefore, timely removal of leaked molten salt is also crucial in engineering practice.

[0004] Invention patent (CN111648395A) discloses a basic structure for a high-temperature molten salt storage tank. This structure has low construction costs, a sloping concrete layer with a higher center and lower perimeter, and a drainage pipe, effectively solving the problem of water retention during rainy weather. Furthermore, annular grooves are installed on the leak-proof steel plate layer, connected to the outside via a salt discharge pipe, effectively addressing the challenge of smoothly draining molten salt in the event of a leak. However, this device only addresses molten salt leaks and discharge from the bottom of the tank, failing to handle leaks from the side walls. Moreover, the salt discharge pipe is prone to blockage due to condensation of the molten salt during the discharge process, making it difficult to meet the requirements for comprehensive leak detection and salt discharge for high-temperature storage tanks.

[0005] The invention patent (CN111879019A) discloses a system for detecting molten salt leakage in a solar thermal power generation thermal storage device using electrode plates. This invention can detect leaks in the molten salt storage tank in a timely manner and determine the location of the leak for prompt handling. However, since the device detects leaks by transmitting current, it is easily affected by environmental factors such as humidity in the foundation and does not have a salt discharge function, making it difficult to meet the function of timely detection and discharge of molten salt leaks.

[0006] Overall, current molten salt storage tank leakage and drainage technologies lack integrated functionality, and molten salt leak detection suffers from instability. Drainage technologies often target leaks at the bottom of the tank, neglecting the sidewalls, where molten salt leaks are most likely to occur. Furthermore, these drainage technologies suffer from drawbacks such as molten salt blockage and significant damage to the tank foundation. Summary of the Invention

[0007] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a multi-directional leakage and salt discharge device for molten salt storage tanks. It adopts an integrated and all-round molten salt leakage and salt discharge scheme, which has stable and non-clogging capabilities, timely salt discharge and molten salt recovery capabilities, and does not cause harm to the foundation.

[0008] The technical solution adopted in this invention is as follows:

[0009] A multi-directional leakage and salt discharge device for a molten salt storage tank includes an insulated foundation structure, a side leakage detection and salt discharge structure, a bottom leakage detection and salt discharge structure, and a salt storage tank. The insulated foundation structure is located at the bottom of the molten salt storage tank. The side leakage detection and salt discharge structure is located around the molten salt storage tank and installed on top of the insulated foundation structure. The salt storage tank is located around the insulated foundation structure. The bottom leakage detection and salt discharge structure is located inside the insulated foundation structure. One end of the bottom leakage detection and salt discharge structure extends below the molten salt storage tank, and the other end of the bottom leakage detection and salt discharge structure and the end of the side leakage detection and salt discharge structure away from the molten salt storage tank are both connected to the salt storage tank.

[0010] The thermal insulation foundation structure of this invention serves to insulate the molten salt storage tank. A side leakage detection and drainage structure is installed above the edge of the tank's bottom plate to detect leaks at the connection between the tank wall and the bottom plate, and guides the liquid molten salt towards the storage tank. A bottom leakage detection and drainage structure is installed inside the thermal insulation foundation structure to detect leaks in the tank's bottom plate and collect and drain any liquid molten salt that has seeped into the foundation, then directs the molten salt into the storage tank. The storage tank is connected to the outlets of the side and bottom leakage detection and drainage structures to collect and temporarily store leaked molten salt.

[0011] This invention enables real-time monitoring of molten salt leaks in high-temperature storage tanks, offering rapid response and low monitoring costs, thus facilitating industrial application. It achieves multi-directional leak monitoring and salt removal from storage tanks, avoiding the limitations of existing methods that lack comprehensive monitoring coverage. The system integrates molten salt leak monitoring and salt removal, exhibiting a high degree of integration, minimal impact on the tank structure, and prevention of damage to the foundation structure and materials from leaked molten salt, while also maintaining low construction costs. Furthermore, through salt removal methods and the establishment of salt storage tanks, this invention enables the recovery of leaked molten salt, reducing related processing costs.

[0012] As a preferred embodiment of the present invention, the thermal insulation foundation structure includes a tank bottom plate, a molten salt tank is installed on the tank bottom plate, and below the tank bottom plate, from the inside to the outside, there are a sand layer, a refractory brick structure, heat-resistant concrete, an outer refractory brick and a steel annular wall.

[0013] As a preferred embodiment of the present invention, the bottom plate of the storage tank, the sand layer, the refractory bricks and the upper surface of the heat-resistant concrete all have a slope.

[0014] As a preferred embodiment of the present invention, the leakage detection and salt discharge structure at the side of the molten salt storage tank includes a drainage base plate arranged in a ring around the molten salt storage tank, a base plate resistance heating wire is provided inside the drainage base plate, a baffle arranged in a ring is provided on the outer ring of the drainage base plate, a plurality of drainage channels are provided on the baffle, a channel resistance heating wire is provided at the bottom of the drainage channel, the other end of the drainage channel is connected to the salt storage tank, and the drainage base plate and the drainage channel have a slope.

[0015] As a preferred embodiment of the present invention, a channel temperature sensor is installed in the drainage channel, and the base plate resistance heating wire and the channel resistance heating wire are electrically connected to the channel temperature sensor respectively.

[0016] As a preferred embodiment of the present invention, a molten salt storage tank is formed on the upper side of the refractory bricks, and a sand layer is located between the molten salt storage tank and the bottom plate of the storage tank; the leakage detection and salt discharge structure at the bottom of the molten salt storage tank includes a discharge channel, which passes through the steel annular wall, the outer refractory bricks, the refractory concrete and the refractory bricks in sequence and extends into the molten salt storage tank, and the other end of the discharge channel is connected to the salt storage tank.

[0017] As a preferred embodiment of the present invention, the end of the discharge channel extending into the molten salt storage tank is provided with a porous medium region.

[0018] As a preferred embodiment of the present invention, the top of the salt storage tank is connected to a vertical channel, and the leakage detection and salt discharge structure and the discharge channel on the side of the storage tank are all connected to the vertical channel.

[0019] As a preferred embodiment of the present invention, a bottom temperature sensor is installed in the vertical channel, the drain channel is connected to the side wall of the vertical channel, and the bottom temperature sensor is located in the vertical channel directly opposite the drain channel; the leakage detection and salt discharge structure at the side of the storage tank includes a bottom plate resistance heating wire and a channel resistance heating wire, and the salt storage tank includes a tank resistance heating wire. The bottom plate resistance heating wire, the channel resistance heating wire, and the tank resistance heating wire are all electrically connected to the bottom temperature sensor.

[0020] As a preferred embodiment of the present invention, an internal resistance heating wire is installed inside the wall of the salt storage tank, and a cover plate is connected to the top of the salt storage tank, on which an internal temperature sensor is installed.

[0021] The beneficial effects of this invention are as follows:

[0022] The thermal insulation foundation structure of this invention serves to insulate the molten salt storage tank. A side leakage detection and drainage structure is installed above the edge of the tank's bottom plate to detect leaks at the connection between the tank wall and the bottom plate, and guides the liquid molten salt towards the storage tank. A bottom leakage detection and drainage structure is installed inside the thermal insulation foundation structure to detect leaks in the tank's bottom plate and collect and drain any liquid molten salt that has seeped into the foundation, then directs the molten salt into the storage tank. The storage tank is connected to the outlets of the side and bottom leakage detection and drainage structures to collect and temporarily store leaked molten salt.

[0023] This invention enables real-time monitoring of molten salt leaks in high-temperature storage tanks, offering rapid response and low monitoring costs, thus facilitating industrial application. It achieves multi-directional leak monitoring and salt removal from storage tanks, avoiding the limitations of existing methods that lack comprehensive monitoring coverage. The system integrates molten salt leak monitoring and salt removal, exhibiting a high degree of integration, minimal impact on the tank structure, and prevention of damage to the foundation structure and materials from leaked molten salt, while also maintaining low construction costs. Furthermore, through salt removal methods and the establishment of salt storage tanks, this invention enables the recovery of leaked molten salt, reducing related processing costs. Attached Figure Description

[0024] Figure 1 This is a partial structural diagram of the present invention;

[0025] Figure 2 This is a top view of the present invention.

[0026] In the diagram: 1-Inner tank resistance heating wire; 2-Salt storage tank; 3-Cover plate; 4-Inner tank temperature sensor; 5-Steel annular wall; 6-Bottom temperature sensor; 7-Outer refractory brick; 8-Channel temperature sensor; 9-Channel resistance heating wire; 10-Drainage channel; 11-Baffle; 12-Bottom plate resistance heating wire; 13-Drainage bottom plate; 14-Storage tank bottom plate; 15-Drainage channel; 16-Refractory concrete; 17-Refractory brick structure; 18-Porous media area; 19-Sand layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0029] like Figure 1 and Figure 2 As shown, the multi-directional leakage and salt discharge device for molten salt storage tank in this embodiment includes an insulated foundation structure, a side leakage detection and salt discharge structure, a bottom leakage detection and salt discharge structure, and a salt storage tank 2. The insulated foundation structure is located at the bottom of the molten salt storage tank, the side leakage detection and salt discharge structure is located on the periphery of the molten salt storage tank, the side leakage detection and salt discharge structure is installed on top of the insulated foundation structure, the salt storage tank 2 is located on the periphery of the insulated foundation structure, and the bottom leakage detection and salt discharge structure is set inside the insulated foundation structure. One end of the bottom leakage detection and salt discharge structure extends to the bottom of the molten salt storage tank, and the other end of the bottom leakage detection and salt discharge structure and the end of the side leakage detection and salt discharge structure away from the molten salt storage tank are both connected to the salt storage tank 2.

[0030] The thermal insulation foundation structure of this invention serves to insulate the molten salt storage tank. A side leakage detection and drainage structure is installed above the edge of the tank bottom plate 14 to detect leaks at the connection between the tank wall and the bottom plate, and to guide the liquid molten salt to the storage tank 2. A bottom leakage detection and drainage structure is installed inside the thermal insulation foundation structure to detect leaks in the tank bottom plate 14, collect and drain the liquid molten salt that has seeped into the foundation, and then guide the molten salt into the storage tank 2. The storage tank 2 is connected to the outlets of the side leakage detection and drainage structure and the bottom leakage detection and drainage structure, and is used to collect and temporarily store leaked molten salt.

[0031] This invention enables real-time monitoring of molten salt leaks in high-temperature storage tanks, offering rapid response and low monitoring costs, thus facilitating industrial application. It achieves multi-directional leak monitoring and salt removal from storage tanks, avoiding the limitations of existing methods that lack comprehensive monitoring coverage. The system integrates molten salt leak monitoring and salt removal, exhibiting a high degree of integration, minimal impact on the tank structure, and prevention of damage to the foundation structure and materials from leaked molten salt, while also maintaining low construction costs. Furthermore, through salt removal methods and the installation of a salt storage tank 2, this invention enables the recovery of leaked molten salt, reducing related processing costs.

[0032] Specifically, the insulated foundation structure includes a tank bottom plate 14, on which a molten salt storage tank is installed. Below the tank bottom plate 14, from the inside out, are arranged a sand layer 19, a refractory brick structure 17, heat-resistant concrete, an outer refractory brick 7, and a steel annular wall 5. The upper surfaces of the tank bottom plate 14, the sand layer 19, the refractory bricks, and the heat-resistant concrete all have a slope of 1.5% to allow the molten salt to flow towards the outside of the molten salt storage tank by gravity when it leaks.

[0033] Specifically, the leakage detection and salt discharge structure at the side of the molten salt storage tank includes a drainage base plate 13 arranged in a ring around the molten salt storage tank. A base plate resistance heating wire 12 is installed inside the drainage base plate 13. A ring-shaped baffle 11 is arranged around the outer ring of the drainage base plate 13. Several drainage channels 10 are provided on the baffle 11. A channel resistance heating wire 9 is installed at the bottom of the drainage channel 10. The other end of the drainage channel 10 is connected to the salt storage tank 2. The drainage base plate 13 is closely connected to the tank bottom plate 14 and has a large slope.

[0034] A channel temperature sensor 8 is installed inside the drainage channel 10, and the base plate resistance heating wire 12 and the channel resistance heating wire 9 are electrically connected to the channel temperature sensor 8 respectively.

[0035] When a molten salt storage tank leaks from the side, such as at the welded joint between the tank wall and the bottom plate 14, the molten salt flows along the tank wall towards the bottom plate 14 and is then diverted outwards by the drainage bottom plate 13. The drainage bottom plate 13 is also made of metal and is resistant to corrosion by the molten salt. Since the leaking molten salt is above the surface and exchanges heat rapidly with the low-temperature environment, a bottom plate resistance heating wire 12 is installed inside the drainage bottom plate 13 to prevent solidification. To reduce the extensive use of the bottom plate resistance heating wire 12 and thus save construction costs, a metal baffle 11 of a certain height is installed around the drainage bottom plate 13 to limit the flow range of the molten salt and collect the liquid molten salt at the baffle 11. Four drainage channels 10 are arranged around the baffle 11, with the following layout: Figure 2 As shown, the liquid molten salt is evenly distributed around the bottom plate 14 of the storage tank, allowing the liquid molten salt accumulated around the baffle 11 to be discharged outwards through four drainage channels 10. Each drainage channel 10 is equipped with a channel resistance heating wire 9 and a channel temperature sensor 8, which is a thermocouple temperature sensor. When molten salt leaks, the high temperature causes an abnormal temperature rise in and around the drainage channel 10. When the channel temperature sensor 8 detects the abnormal temperature, it activates all the bottom plate resistance heating wires 12, channel resistance heating wires 9, and tank resistance heating wires 1 to prevent condensation and blockage during discharge, thus ensuring smooth outflow of the molten salt.

[0036] Specifically, a molten salt storage tank is formed on the upper side of the refractory bricks, and a sand layer 19 is located between the molten salt storage tank and the bottom plate 14 of the storage tank. The leakage detection and salt discharge structure at the bottom of the molten salt storage tank includes a discharge channel 15, which passes through the steel annular wall 5, the outer refractory bricks 7, the refractory concrete 16, and the refractory bricks in sequence before extending into the molten salt storage tank. The other end of the discharge channel 15 is connected to the salt storage tank 2. A porous medium area 18 is provided at the end of the discharge channel 15 that extends into the molten salt storage tank.

[0037] Furthermore, the top of the salt storage tank 2 is connected to a vertical channel, and the leakage detection and salt discharge structure on the side of the storage tank and the discharge channel 15 are all connected to the vertical channel.

[0038] A bottom temperature sensor 6 is installed in the vertical channel, and the discharge channel 15 is connected to the side wall of the vertical channel. The bottom temperature sensor 6 is located in the vertical channel directly opposite the discharge channel 15. The leakage detection and salt discharge structure on the side of the storage tank includes a bottom plate resistance heating wire 12 and a channel resistance heating wire 9. The salt storage tank 2 includes a tank resistance heating wire 1. The bottom plate resistance heating wire 12, the channel resistance heating wire 9, and the tank resistance heating wire 1 are all electrically connected to the bottom temperature sensor 6.

[0039] When the bottom plate 14 of the storage tank cracks, causing molten salt to leak, the liquid molten salt will flow through the sand layer 19. Because the sand has high thermal conductivity and is in direct contact with the bottom plate 14, its overall temperature is relatively high, causing the molten salt to remain in a liquid state within the sand layer 19. The liquid molten salt flows to the bottom of the sand layer 19 and accumulates there. The refractory brick structure 17 is a double-layered, staggered vertical joint filling, forming a natural isolation layer, allowing the liquid molten salt to collect at the bottom of the sand layer 19. Four drainage channels 15 are also provided at the outermost edge of the bottom of the sand layer 19, where it intersects with the refractory brick structure 17. The inner surface of these channels is a smooth steel ring wall, ensuring smooth flow of the molten salt and providing support. A porous medium area 18 is also provided, with pores of a size sufficient to allow the liquid molten salt to flow smoothly while blocking the sand in the sand layer 19. This area is made of metal or a strong, molten salt-resistant material. A bottom temperature sensor 6 is installed on the outermost side of the discharge channel 15. When the molten salt leaks from the bottom, it flows within the relatively enclosed discharge channel 15, and the high temperature generated by the molten salt can be directly and effectively transmitted to the bottom temperature sensor 6. When it detects an abnormal temperature, it will also activate the bottom plate resistance heating wire 12, the channel resistance heating wire 9, and the groove resistance heating wire to prevent the molten salt from condensing and causing blockage during the discharge process.

[0040] Specifically, the salt storage tank 2 has an internal resistance heating wire 1 installed inside its wall, and a cover plate 3 connected to the top of the salt storage tank 2. An internal temperature sensor 4 is installed on the cover plate 3. When molten salt leaks in either of the two possible directions, the discharged molten salt flows through the corresponding channel into the salt storage tank 2. The internal resistance heating wire 1 is arranged inside the salt storage tank 2, receiving signals from the channel temperature sensor 8 and the bottom temperature sensor 6 and activating accordingly. The cover plate 3 is installed on the top of the salt storage tank 2 to prevent interference from the external environment, ensuring the purity of the leaked molten salt for subsequent molten salt recovery. The internal temperature sensor 4 is located below the cover plate 3, which monitors abnormal temperatures within the salt storage tank 2 and promptly provides an abnormal leak signal to the power plant operator, enabling staff to detect the leak in a timely manner and implement relevant emergency measures.

[0041] The molten salt storage tank leakage drainage method of this embodiment includes the following steps:

[0042] Leakage detection steps: Temperature data is monitored in real time by temperature sensors arranged in the side drainage channel 10 and the bottom drainage channel 15; when an abnormal temperature rise is detected, it is determined that a molten salt leak has occurred.

[0043] Heating and anti-condensation steps: Once a leak is detected, immediately activate all heating elements in the drainage base plate 13, drainage channel 10, discharge channel 15 and salt storage tank 2 to form full thermal protection and prevent molten salt from solidifying and blocking during discharge.

[0044] Drainage procedure: Molten salt leaking from the side is collected by the drainage bottom plate 13 and discharged into the salt storage tank 2 through the drainage channel 10; Molten salt leaking from the bottom seeps down through the sand layer 19, is filtered by the porous medium area 18, and is discharged into the salt storage tank 2 through the discharge channel 15.

[0045] Alarm collection steps: The leaked molten salt accumulates in the salt storage tank 2. After the temperature sensor 4 in the tank detects that the temperature is continuously abnormal, it sends the final leak alarm signal to the monitoring center.

[0046] During the heating and anti-condensation process, the heating elements of the side leakage detection and salt drainage structure and the bottom leakage detection and salt drainage structure are activated in tandem, ensuring that the heating function is activated throughout the process regardless of where the leakage occurs.

[0047] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A multi-directional leakage and salt discharge device for a molten salt storage tank, characterized in that: Including thermal insulation foundation structure, leakage detection and salt drainage structure at the side of the storage tank, leakage detection and salt drainage structure at the bottom, and salt storage tank (2); The thermal insulation foundation structure is located at the bottom of the molten salt storage tank. The leakage detection and salt discharge structure on the side of the storage tank is located on the periphery of the molten salt storage tank. The leakage detection and salt discharge structure on the side of the storage tank is installed on the top of the thermal insulation foundation structure. The salt storage tank (2) is located on the periphery of the thermal insulation foundation structure. The leakage detection and salt discharge structure at the bottom is set inside the thermal insulation foundation structure. One end of the leakage detection and salt discharge structure at the bottom extends to the bottom of the molten salt storage tank. The other end of the leakage detection and salt discharge structure at the bottom and the end of the leakage detection and salt discharge structure on the side of the storage tank away from the molten salt storage tank are both connected to the salt storage tank (2). The leakage detection and salt discharge structure at the side of the molten salt storage tank includes a drainage base plate (13) arranged in a ring around the molten salt storage tank. A base plate resistance heating wire (12) is provided inside the drainage base plate (13). A baffle (11) is arranged in a ring around the outer ring of the drainage base plate (13). Several drainage channels (10) are provided on the baffle (11). A channel resistance heating wire (9) is provided at the bottom of the drainage channel (10). The other end of the drainage channel (10) is connected to the salt storage tank (2). The drainage base plate (13) and the drainage channel (10) have a slope.

2. The molten salt storage tank multi-directional leakage and salt discharge device according to claim 1, characterized in that: The thermal insulation foundation structure includes a tank bottom plate (14), a molten salt tank is installed on the tank bottom plate (14), and below the tank bottom plate (14) from the inside to the outside are arranged a sand layer (19), a refractory brick structure (17), heat-resistant concrete, an outer refractory brick (7) and a steel annular wall (5).

3. The molten salt storage tank multi-directional leakage and salt discharge device according to claim 2, characterized in that: The bottom plate (14) of the storage tank, the sand layer (19), the upper surface of the refractory bricks and the heat-resistant concrete are all sloped.

4. The molten salt storage tank multi-directional leakage and salt discharge device according to claim 1, characterized in that: The drainage channel (10) is equipped with a channel temperature sensor (8), and the bottom plate resistance heating wire (12) and the channel resistance heating wire (9) are electrically connected to the channel temperature sensor (8).

5. A multi-directional leakage and salt discharge device for a molten salt storage tank according to claim 2, characterized in that: A molten salt storage tank is formed on the upper side of the refractory bricks, and a sand layer (19) is located between the molten salt storage tank and the bottom plate (14) of the storage tank. The leakage detection and salt discharge structure at the bottom of the molten salt storage tank includes a discharge channel (15). The discharge channel (15) passes through the steel annular wall (5), the outer refractory brick (7), the refractory concrete (16) and the refractory bricks in sequence and then extends into the molten salt storage tank. The other end of the discharge channel (15) is connected to the salt storage tank (2).

6. The molten salt storage tank multi-directional leakage and salt discharge device according to claim 5, characterized in that: The drain channel (15) extends into the molten salt storage tank and has a porous medium area (18) at one end.

7. A multi-directional leakage and salt discharge device for a molten salt storage tank according to claim 5, characterized in that: The top of the salt storage tank (2) is connected to a vertical channel, and the leakage detection and salt discharge structure and the discharge channel (15) on the side of the tank are all connected to the vertical channel.

8. A multi-directional leakage and salt discharge device for a molten salt storage tank according to claim 7, characterized in that: A bottom temperature sensor (6) is installed in the vertical channel. The drain channel (15) is connected to the side wall of the vertical channel. The bottom temperature sensor (6) is located in the vertical channel directly opposite the drain channel (15). The side leakage detection and salt discharge structure of the storage tank includes a bottom plate resistance heating wire (12) and a channel resistance heating wire (9). The salt storage tank (2) includes a tank resistance heating wire (1). The bottom plate resistance heating wire (12), the channel resistance heating wire (9) and the tank resistance heating wire (1) are all electrically connected to the bottom temperature sensor (6).

9. A multi-directional leakage and salt discharge device for a molten salt storage tank according to any one of claims 1 to 8, characterized in that: The salt storage tank (2) is equipped with an in-tank resistance heating wire (1) inside the tank wall, and a cover plate (3) is connected to the top of the salt storage tank (2). A tank temperature sensor (4) is installed on the cover plate (3).

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