A composite high thermal conductivity molten salt heat storage device

Abstract

The present invention provides a composite high thermal conductivity molten salt heat storage device, which relates to the field of heat storage, and includes a plurality of molten salt storage tanks. The molten salt storage tanks are suitable for storing molten salt heat storage materials. The top of each molten salt storage tank has two displacement interfaces, and a discharge structure is connected between the two displacement interfaces. The molten salt storage tanks also include: a fluid medium inlet pipe, a fluid medium outlet pipe, a drainage pipe, and a heat exchange carrier. When the molten salt storage tank is under high pressure, the molten salt storage tank of the present invention will push a positive pressure sealing ball to compress a positive pressure support spring to open a through-hole guide block 1, and the fluid enters the buffer tank to push the piston to move upward to the position of the contact plate to stop pressure relief. When the molten salt storage tank is under pressure reduction, the negative pressure sealing ball will be pushed to compress the negative pressure support spring to open the through-hole guide block 2, and the fluid will flow out of the buffer tank for pressure supplementation. According to different molten salt heat storage materials, the screw rod can also be rotated to adjust the position of the contact plate, thereby regulating the pressure supplement amount, so as to avoid the risk of molten salt storage tank bursting.

Description

Technical Field

[0001] The present invention relates to the field of heat storage, and in particular to a composite high thermal conductivity molten salt heat storage device. Background Art

[0002] Molten salt energy storage heating utilizes the excellent heat storage characteristics of molten salt. Low-cost valley electricity is used to heat the molten salt and store heat at night. It has the characteristics of long heat storage time, safety, environmental protection, and economy. It has more advantages than the previous photovoltaic conversion heating and will truly realize a green heating system that does not burn coal, does not burn gas, has zero emissions, and has zero pollution.

[0003] At present, the commonly used molten salt heat storage device is a single tank with coils arranged inside. The fluid flows through the coils to exchange heat with the molten salt inside. Due to the low thermal conductivity of molten salt, a large temperature difference is required for better heat exchange. When the heat transfer temperature difference is small, the heat exchange efficiency is reduced. The traditional coil heat exchange structure is difficult to form a large temperature difference during flow, which will lead to reduced heat exchange efficiency. Moreover, since molten salts with different temperature parameters are mixed and stored in the same tank, this puts higher requirements on the operation and control of the system. In addition, the "single tank" molten salt heat storage technology solution cannot simply expand the capacity. During the heat storage process of the heat storage tank, there is thermal expansion and contraction, which can easily cause the single tank to burst, directly affecting the service life of the heat storage tank. For this reason, we have made improvements and proposed a composite high thermal conductivity molten salt heat storage device. Summary of the invention

[0004] The purpose of the present invention is to provide a composite high thermal conductivity molten salt heat storage device, which realizes multi-tank series zone heat exchange and ensures the heat expansion and contraction adaptation effect during the heat exchange process to reduce the risk of heat storage tank bursting.

[0005] In order to achieve the above-mentioned invention object, the present invention provides a composite high thermal conductivity molten salt heat storage device, comprising a plurality of molten salt storage tanks, the molten salt storage tanks are suitable for storing molten salt heat storage materials, each of the molten salt storage tanks has two displacement interfaces on the top, and a discharge structure is connected between the two displacement interfaces. When the molten salt stored in the molten salt storage tank expands and contracts, pressure compensation can be performed through the discharge structure, and also includes:

[0006] A fluid medium inlet pipe is connected to the side wall of the molten salt storage tank for introducing the fluid medium. The front end of the fluid medium inlet pipe has a flange, and the flange can be connected to the supply pipe by bolts.

[0007] A fluid medium outlet pipe is connected to the side wall of the molten salt storage tank for leading out the fluid medium. The front end of the fluid medium outlet pipe is provided with a flange, and the flange can be connected to the return pipe by bolts.

[0008] A drainage pipe is connected between the fluid medium inlet pipe and the fluid medium outlet pipe so that the fluid in the fluid medium inlet pipe and the fluid medium outlet pipe forms a circulation state in the molten salt storage tank, and both ends of the drainage pipe include a flange that can be connected with the flanges on the fluid medium inlet pipe and the fluid medium outlet pipe;

[0009] The heat exchange carrier is arranged in an S-shape with its ends connected end to end inside the molten salt storage tank, and its two ends are respectively connected to the fluid medium inlet pipe and the fluid medium outlet pipe. A fluid channel is formed inside the heat exchange carrier, and the fluid channel is used to pass fluid to store or release heat to the molten salt heat storage material. The heat exchange carrier is reciprocally stacked in the molten salt storage tank to extend the time it passes through the molten salt storage tank and ensure the heat exchange efficiency. When high-temperature fluid is injected into the fluid channel, the high temperature can be transferred to the molten salt heat storage material for heat storage. When low-temperature fluid is injected into the fluid channel, the high temperature in the molten salt heat storage material can be transferred to the low-temperature fluid for heat release.

[0010] As a preferred technical solution of the present invention, the discharge structure includes a positive pressure tube and a negative pressure tube respectively fixedly connected to two displacement interfaces, a buffer tank is installed between the positive pressure tube and the negative pressure tube, a piston is slidably connected to the inner wall of the buffer tank, a quantitative adjustment mechanism is threadedly connected to the top of the buffer tank, a positive pressure opening and closing component is arranged in the positive pressure tube, and a negative pressure opening and closing component is arranged in the negative pressure tube. When the molten salt storage tank is in a high pressure state, the positive pressure opening and closing component will be pushed to open, and the fluid enters the buffer tank to push the piston to move upward to relieve pressure. When the molten salt storage tank is in a depressurized state, the negative pressure opening and closing component will be opened, and the fluid will flow out of the buffer tank to replenish the pressure. The quantitative adjustment mechanism can also be adjusted according to different molten salt heat storage materials to regulate the pressure replenishment amount.

[0011] As a preferred technical solution of the present invention, the quantitative adjustment mechanism includes an adjusting screw threadedly connected to the top of the buffer tank, a rotating handle is provided on the top of the adjusting screw, and a contact plate is provided on the bottom of the adjusting screw. When the piston moves to the contact plate position, it is in a restricted state. When the replenishment amount needs to be adjusted, the adjusting screw is rotated to push the contact plate to move up and down. Since the piston is in a restricted state when it moves to the contact plate position, the piston throughput can be adjusted by adjusting the contact plate.

[0012] As a preferred technical solution of the present invention, the positive pressure opening and closing component includes a positive pressure support spring fixedly connected to the inner wall of the positive pressure tube, one end of the positive pressure support spring is fixedly connected to a positive pressure closing ball, and the positive pressure opening and closing component also includes a through hole guide block one fixedly connected to the inner wall of the positive pressure tube and adapted to the positive pressure closing ball, the inner arc concave surface of the through hole guide block one is arranged upward, and when the high pressure in the molten salt storage tank is generated, the positive pressure closing ball is driven to compress the positive pressure support spring and separate from the through hole guide block one, and at this time the through hole guide block one can be opened for transportation.

[0013] As a preferred technical solution of the present invention, the negative pressure opening and closing component includes a negative pressure support spring fixedly connected to the inner wall of the negative pressure tube, one end of the negative pressure support spring is fixedly connected to a negative pressure closing ball, and the negative pressure opening and closing component also includes a through hole guide block 2 fixedly connected to the inner wall of the negative pressure tube and adapted to the negative pressure closing ball, the inner arc concave surface of the through hole guide block 2 is arranged downward, and when there is negative pressure in the molten salt storage tank, the negative pressure closing ball compresses the negative pressure support spring and separates it from the through hole guide block 2, thereby opening the through hole guide block 2 for transportation.

[0014] As a preferred technical solution of the present invention, the heat exchange carrier includes a connecting pipe respectively connected to the fluid medium inlet pipe and the fluid medium outlet pipe and a shunt heat exchange pipe with a gap connected to the connecting pipe. By arranging a plurality of shunt heat exchange pipes, the fluid can be shunted and converged, so that the fluid can fully contact with the molten salt heat storage material to complete the heat exchange.

[0015] As a preferred technical solution of the present invention, the diversion heat exchange tube includes four first branch pipes in a ring array and a second branch pipe connected to the first branch pipe. The second branch pipe is located at half of the first branch pipe and is used to enhance the rigidity of the first branch pipe in the center. Through the arrangement of the second branch pipe, the second branch pipe not only serves as a diversion channel but also serves as a supporting structure, so that the rigidity of the first branch pipe is enhanced while ensuring a long flow path and being not easily damaged.

[0016] As a preferred technical solution of the present invention, a first diversion point is formed between the head end of the first branch pipe and the connecting pipe, a first confluence point is formed between the tail end of the first branch pipe and the connecting pipe, a second diversion point is formed at the position where the head end of the second branch pipe is connected to the first branch pipe, and a second confluence point is formed between the tail end of the second branch pipe and the connecting pipe. During the flow process, the fluid is diverted at the first diversion point at the position of the first branch pipe, and is diverted and converged twice at the second diversion point of the second branch pipe. This not only allows the diverted fluid to better conduct heat with the molten salt heat storage material, but also improves the uniformity of the fluid, ensuring that the fluid can quickly and fully exchange heat.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the scheme of the present invention:

[0019] 1. Through the arrangement of the molten salt storage tank, the discharge structure, the fluid medium inlet pipe, the fluid medium outlet pipe, the drainage pipe, the heat exchange carrier and the fluid channel, the molten salt storage tank can be used as a single tank by connecting the drainage pipe, or it can be assembled to realize the use of multiple tanks at the same time. The heat exchange fluid flows in through the fluid medium inlet pipe and flows out through the fluid medium outlet pipe. During the flow process, the heat exchange fluid exchanges heat with the molten salt heat storage material to store heat or release heat. During the flow process, the fluid is divided at the first branch pipe position and divided for the second time and converged twice at the second branch pipe position. In this way, not only the divided fluid can better conduct heat with the molten salt heat storage material, but also the uniformity of the fluid can be improved, ensuring that the fluid can quickly and fully exchange heat. The second branch pipe not only serves as a diversion channel but also serves as a supporting structure, so that the rigidity of the first branch pipe is enhanced, and it is not easy to be damaged while ensuring a long flow channel;

[0020] 2. Through the arrangement of the molten salt storage tank, the discharge structure, the fluid medium inlet pipe, the fluid medium outlet pipe, the drainage pipe, the heat exchange carrier and the fluid channel, when the molten salt storage tank expands and contracts during the heat exchange process, the excess pressure and the molten salt heat storage material liquefied under high temperature can flow into the discharge structure for spatial displacement, thereby avoiding the risk of bursting of the molten salt storage tank. Specifically, when the molten salt storage tank is under high pressure, it will push the positive pressure closing ball to compress the positive pressure supporting spring to open the through hole guide block 1, and the fluid enters the buffer tank to push the piston to move upward to the position of the contact plate to stop pressure relief. When the molten salt storage tank is under reduced pressure, it will push the negative pressure closing ball to compress the negative pressure supporting spring to open the through hole guide block 2, and the fluid will flow out of the buffer tank for pressure replenishment. According to different molten salt heat storage materials, the adjusting screw can also be rotated to adjust the position of the contact plate to regulate the pressure replenishment amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0022] Figure 2 A schematic diagram of the structure of a composite high thermal conductivity molten salt heat storage device in a second use state provided by the present invention;

[0023] Figure 3 A schematic diagram of a partially cutaway structure of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0024] Figure 4 A schematic cross-sectional structure diagram of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0025] Figure 5 A schematic diagram of the structure of a heat exchange carrier of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0026] Figure 6A schematic cross-sectional structure diagram of a heat exchange carrier of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0027] Figure 7 A schematic diagram of the structure of a split flow heat exchange tube of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0028] Figure 8 A schematic diagram of the structure of a discharge structure of a composite high thermal conductivity molten salt heat storage device provided by the present invention;

[0029] Fig. 9 A schematic cross-sectional structure diagram of a discharge structure of a composite high thermal conductivity molten salt heat storage device provided by the present invention.

[0030] Indicated in the figure:

[0031] 1. Molten salt storage tank;

[0032] 2. Discharge structure; 21. Positive pressure pipe; 22. Negative pressure pipe; 23. Buffer tank; 24. Piston; 25. Quantitative adjustment mechanism; 251. Adjusting screw rod; 252. Rotating handle; 253. Contact plate; 26. Positive pressure opening and closing member; 261. Positive pressure supporting spring; 262. Positive pressure closing ball; 263. Through hole guide block 1; 27. Negative pressure opening and closing member; 271. Negative pressure supporting spring; 272. Negative pressure closing ball; 273. Through hole guide block 2;

[0033] 3. Fluid medium enters the pipe;

[0034] 4. Fluid medium outlet pipe;

[0035] 5. Drainage tube;

[0036] 6. heat exchange carrier; 61. connecting pipe; 62. split heat exchange pipe; 621. first branch pipe; 622. second branch pipe; 623. first split point; 624. first confluence point; 625. second split point; 626. second confluence point;

[0037] 7. Fluid channel. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0039] See also Figures 1 to 9The present invention provides a technical solution: a composite high thermal conductivity molten salt heat storage device, comprising a plurality of molten salt storage tanks 1, the molten salt storage tanks 1 are suitable for storing molten salt heat storage materials, each molten salt storage tank 1 has two displacement interfaces on the top, and a discharge structure 2 is connected between the two displacement interfaces. When the molten salt stored in the molten salt storage tank 1 expands and contracts, pressure compensation can be performed through the discharge structure 2, and also includes:

[0040] A fluid medium inlet pipe 3 is connected to the side wall of the molten salt storage tank 1 for introducing the fluid medium. The front end of the fluid medium inlet pipe 3 has a flange, and the flange can be connected to the supply pipe by bolts;

[0041] The fluid medium outlet pipe 4 is connected to the side wall of the molten salt storage tank 1 for leading out the fluid medium. The front end of the fluid medium outlet pipe 4 has a flange, and the flange can be connected to the return pipe by bolts;

[0042] The drainage pipe 5 is connected between the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4 so that the fluid in the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4 forms a circulation state in the molten salt storage tank 1. Both ends of the drainage pipe 5 include a flange that can be connected with the flanges on the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4;

[0043] The heat exchange carrier 6 is arranged in an S-shape with its ends connected head to tail inside the molten salt storage tank 1, and its two ends are respectively connected to the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4. A fluid channel 7 is formed inside the heat exchange carrier 6, and the fluid channel 7 is used to pass fluid to store heat or release heat to the molten salt heat storage material. The heat exchange carrier 6 is reciprocally stacked in the molten salt storage tank 1 to extend the time it passes through the molten salt storage tank 1, thereby ensuring the heat exchange efficiency. When a high-temperature fluid is injected into the fluid channel 7, the high temperature can be transferred to the molten salt heat storage material for heat storage. When a low-temperature fluid is injected into the fluid channel 7, the high temperature in the molten salt heat storage material can be transferred to the low-temperature fluid for heat release.

[0044] As a preferred embodiment, on the basis of the above-mentioned method, further, the discharge structure 2 includes a positive pressure tube 21 and a negative pressure tube 22 respectively fixedly connected to two replacement interfaces, a buffer tank 23 is installed between the positive pressure tube 21 and the negative pressure tube 22, the inner wall of the buffer tank 23 is slidably connected with a piston 24, and the top of the buffer tank 23 is threadedly connected with a quantitative adjustment mechanism 25, a positive pressure opening and closing component 26 is arranged in the positive pressure tube 21, and a negative pressure opening and closing component 27 is arranged in the negative pressure tube 22. When the molten salt storage tank 1 is in a high pressure state, the positive pressure opening and closing component 26 will be pushed to open, and the fluid enters the buffer tank 23 to push the piston 24 to move upward to relieve the pressure. When the molten salt storage tank 1 is in a depressurized state, the negative pressure opening and closing component 27 will be opened, and the fluid will flow out of the buffer tank 23 to replenish the pressure. The quantitative adjustment mechanism can also be adjusted according to different molten salt heat storage materials to regulate the pressure replenishment amount.

[0045] The quantitative adjustment mechanism 25 includes an adjusting screw 251 threadedly connected to the top of the buffer tank 23, a rotating handle 252 is provided on the top of the adjusting screw 251, and a resistance plate 253 is provided on the bottom of the adjusting screw 251. When the piston 24 moves to the position of the resistance plate 253, it is in a restricted state. When the replenishment amount needs to be adjusted, the adjusting screw 251 is rotated to push the resistance plate 253 to move up and down. Since the piston 24 is in a restricted state when it moves to the position of the resistance plate 253, the throughput of the piston 24 can be adjusted by adjusting the resistance plate 253.

[0046] The positive pressure opening and closing component 26 includes a positive pressure support spring 261 fixedly connected to the inner wall of the positive pressure tube 21, one end of the positive pressure support spring 261 is fixedly connected to a positive pressure closing ball 262, the positive pressure opening and closing component 26 also includes a through hole guide block 263 fixedly connected to the inner wall of the positive pressure tube 21 and adapted to the positive pressure closing ball 262, the inner arc concave surface of the through hole guide block 263 is arranged upward, when the molten salt storage tank 1 is under high pressure, the positive pressure closing ball 262 is driven to compress the positive pressure support spring 261 and separate it from the through hole guide block 263, at which time the through hole guide block 263 can be opened for transportation.

[0047] The negative pressure opening and closing component 27 includes a negative pressure support spring 271 fixedly connected to the inner wall of the negative pressure tube 22, one end of the negative pressure support spring 271 is fixedly connected to a negative pressure closing ball 272, and the negative pressure opening and closing component 27 also includes a through hole guide block 273 fixedly connected to the inner wall of the negative pressure tube 22 and adapted to the negative pressure closing ball 272, the inner arc concave surface of the through hole guide block 273 is arranged downward, when there is negative pressure in the molten salt storage tank 1, the negative pressure closing ball 272 compresses the negative pressure support spring 271 and separates it from the through hole guide block 273, thereby opening the through hole guide block 273 for transportation.

[0048] Specifically, when the composite high thermal conductivity molten salt heat storage device is working / in use: Figure 1 As shown, the present invention provides a usage mode, a single tank heat storage, the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4 at the bottom are respectively connected to the external supply pipe, and the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4 at the top are connected by a drainage pipe 5, and the specific shape of the drainage pipe 5 is U-shaped, such as Figure 2As shown, the present invention provides another usage mode, multi-tank heat storage, the fluid medium inlet pipe 3 of the first molten salt storage tank 1 and the fluid medium outlet pipe 4 of the last molten salt storage tank 1 are connected to the external supply pipe, and the remaining fluid medium inlet pipes 3 and fluid medium outlet pipes 4 are connected in series with a drainage pipe 5. When the molten salt storage tank 1 expands and contracts during heat exchange, the excess pressure and the molten salt heat storage material liquefied under high temperature can flow into the discharge structure 2 for spatial replacement, which can avoid the risk of bursting of the molten salt storage tank. Specifically, when the high pressure of the molten salt storage tank In this state, the positive pressure closing ball 262 will be pushed to compress the positive pressure supporting spring 261 to open the through hole guide block 1 263, and the fluid enters the buffer tank 23 to push the piston 24 to move upward to the position of the contact plate 253 to stop pressure relief. When the molten salt storage tank 1 is in the depressurized state, the negative pressure closing ball 272 will be pushed to compress the negative pressure supporting spring 271 to open the through hole guide block 2 273, and the fluid will flow out of the buffer tank 23 to replenish the pressure. According to different molten salt heat storage materials, the adjusting screw 251 can also be rotated to adjust the position of the contact plate 253, thereby regulating the pressure replenishment amount.

[0049] As a preferred embodiment, on the basis of the above-mentioned method, further, the heat exchange carrier 6 includes a connecting pipe 61 respectively connected to the fluid medium inlet pipe 3 and the fluid medium outlet pipe 4 and a shunt heat exchange pipe 62 connected to the connecting pipe 61 with a gap. By setting a plurality of shunt heat exchange pipes 62, the fluid can be shunted and converged, so that the fluid can fully contact with the molten salt heat storage material to complete the heat exchange.

[0050] The shunt heat exchange tube 62 includes four first branch pipes 621 in a circular array and a second branch pipe 622 connected to the first branch pipe 621. The second branch pipe is located at half of the first branch pipe 621 to enhance the rigidity of the first branch pipe 621 at the center. Through the arrangement of the second branch pipe 622, the second branch pipe 622 not only serves as a shunt channel but also serves as a supporting structure, so that the rigidity of the first branch pipe 621 is enhanced while ensuring a long flow path and being not easily damaged.

[0051] A first branch point 623 is formed between the head end of the first branch pipe 621 and the connecting pipe 61, a first confluence point 624 is formed between the tail end of the first branch pipe 621 and the connecting pipe 61, a second branch point 625 is formed at the position where the head end of the second branch pipe 622 is connected to the first branch pipe 621, and a second confluence point 626 is formed between the tail end of the second branch pipe 622 and the connecting pipe 61. During the flow process, the fluid is diverted at the first branch point 623 at the position of the first branch pipe 621, and is diverted and converged twice at the second branch point 625 at the second branch pipe 622. This not only allows the diverted fluid to better conduct heat to the molten salt heat storage material, but also improves the uniformity of the fluid, ensuring that the fluid can quickly and fully exchange heat.

[0052] Specifically, when the composite high thermal conductivity molten salt heat storage device is working / in use: the heat exchange fluid flows in through the fluid medium inlet pipe 3 and flows out through the fluid medium outlet pipe 4, and performs heat exchange and heat storage or heat release with the molten salt heat storage material during the flow process. During the flow process, the fluid is diverted at the first diversion point 623 at the position of the first branch pipe 621, and diverted for the second time at the second diversion point 625 of the second branch pipe 622, and converged at the first confluence point 624 and the second confluence point 626. Multiple diversions and confluences enable the fluid to better conduct heat with the molten salt heat storage material and improve the uniformity of the fluid, ensuring that the fluid can quickly and fully exchange heat. The second branch pipe 622 not only serves as a diversion channel but also serves as a supporting structure, so that the rigidity of the first branch pipe 621 is enhanced while ensuring a long flow path and being not easily damaged.

[0053] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A composite high thermal conductivity molten salt heat storage device, characterized in that: The invention comprises a plurality of molten salt storage tanks (1), wherein the molten salt storage tanks (1) are suitable for storing molten salt heat storage materials, wherein the top of each molten salt storage tank (1) has two displacement interfaces, and a leakage structure (2) is connected between the two displacement interfaces, and when the molten salt stored in the molten salt storage tank (1) expands and contracts due to heat or cold, pressure compensation can be performed through the leakage structure (2), and further comprises: A fluid medium inlet pipe (3) connected to the side wall of the molten salt storage tank (1) for introducing the fluid medium; A fluid medium outlet pipe (4) connected to the side wall of the molten salt storage tank (1) for leading out the fluid medium; A drainage pipe (5) connected between the fluid medium inlet pipe (3) and the fluid medium outlet pipe (4) so ​​that the fluid in the fluid medium inlet pipe (3) and the fluid medium outlet pipe (4) forms a circulation state in the molten salt storage tank (1); The heat exchange carrier (6) is arranged in an S-shaped manner with its ends connected end to end inside the molten salt storage tank (1), and its two ends are respectively connected to the fluid medium inlet pipe (3) and the fluid medium outlet pipe (4), and a fluid channel (7) is formed inside the heat exchange carrier (6), and the fluid channel (7) is used to pass the fluid medium to store or release heat in the molten salt heat storage material; The discharge structure (2) comprises a positive pressure tube (21) and a negative pressure tube (22) respectively fixedly connected to two displacement interfaces, a buffer tank (23) is installed between the positive pressure tube (21) and the negative pressure tube (22), a piston (24) is slidably connected to the inner wall of the buffer tank (23), a quantitative adjustment mechanism (25) is threadedly connected to the top of the buffer tank (23), a positive pressure opening and closing component (26) is arranged in the positive pressure tube (21), and a negative pressure opening and closing component (27) is arranged in the negative pressure tube (22); The quantitative adjustment mechanism (25) comprises an adjustment screw (251) threadedly connected to the top of the buffer tank (23); a rotating handle (252) is provided at the top of the adjustment screw (251); a resistance plate (253) is provided at the bottom of the adjustment screw (251); and the piston (24) is in a restricted state when it moves to the position of the resistance plate (253); The positive pressure opening and closing component (26) comprises a positive pressure support spring (261) fixedly connected to the inner wall of the positive pressure tube (21), one end of the positive pressure support spring (261) being fixedly connected to a positive pressure sealing ball (262), and the positive pressure opening and closing component (26) further comprises a through hole guide block (263) fixedly connected to the inner wall of the positive pressure tube (21) and adapted to the positive pressure sealing ball (262), the inner arc concave surface of the through hole guide block (263) being arranged upward; The negative pressure opening and closing component (27) comprises a negative pressure support spring (271) fixedly connected to the inner wall of the negative pressure tube (22), one end of the negative pressure support spring (271) being fixedly connected to a negative pressure closing ball (272), and the negative pressure opening and closing component (27) further comprises a through hole guide block 2 (273) fixedly connected to the inner wall of the negative pressure tube (22) and adapted to the negative pressure closing ball (272), the inner arc concave surface of the through hole guide block 2 (273) being arranged downward.

2. A composite high thermal conductivity molten salt heat storage device according to claim 1, characterized in that: The heat exchange carrier (6) comprises a connecting pipe (61) respectively connected to the fluid medium inlet pipe (3) and the fluid medium outlet pipe (4), and a split flow heat exchange pipe (62) gap-connected to the connecting pipe (61).

3. A composite high thermal conductivity molten salt heat storage device according to claim 2, characterized in that: The split-flow heat exchange tube (62) comprises four first branch tubes (621) in a ring array and a second branch tube (622) connected to the first branch tube (621), wherein the second branch tube is located at a half position of the first branch tube (621) and is used to enhance the rigidity of the first branch tube (621) at the center.

4. A composite high thermal conductivity molten salt heat storage device according to claim 3, characterized in that: A first branching point (623) is formed between the head end of the first branch pipe (621) and the connecting pipe (61), a first confluence point (624) is formed between the tail end of the first branch pipe (621) and the connecting pipe (61), a second branching point (625) is formed at the position where the head end of the second branch pipe (622) is connected to the first branch pipe (621), and a second confluence point (626) is formed between the tail end of the second branch pipe (622) and the connecting pipe (61).

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