Fused salt single-tank energy storage molten salt tank with thermocline cooperative self-control function

Abstract

The utility model relates to a fused salt single-tank energy storage fused salt tank with thermocline collaborative self-control. A hot fused salt section composite phase-change material framework, a thermocline section composite phase-change material framework and a cold fused salt section composite phase-change material framework are sequentially arranged on the inner wall of a tank body from top to bottom; each framework is a porous ceramic framework with different pore diameters and porosities, and the longitudinal temperature gradient of the tank body is adjusted by optimizing and adjusting the porosities, pore diameters and hierarchical arrangement of the porous ceramics; the temperature uniformity of the hot molten salt section in the vertical direction can be enhanced, the horizontal temperature uniformity of the cold molten salt section can be improved, flowing can be controlled, momentum alternating current between a thermocline area and other layers can be reduced so as to reduce the thermocline control difficulty, cooperative self-control over the thermocline in the single-tank molten salt energy storage process can be achieved, and the thickness of the thermocline can be reduced so as to increase the effective area.

Description

Technical Field

[0001] The utility model relates to the field of molten salt heat storage, and in particular to a molten salt single-tank energy storage molten salt tank with coordinated automatic control of a thermocline. Background Art

[0002] The combination of molten salt storage tanks and composite phase change materials is the main research direction in the field of molten salt heat storage. Generally speaking, phase change materials generally have the problem of low thermal conductivity. Taking the most commonly used molten salt medium in the field of heat storage as an example, its thermal conductivity is only 0.49W / m·K. Composite phase change materials can greatly improve the thermal conductivity of phase change materials while ensuring that the energy storage density does not decrease significantly, thereby effectively improving the heat storage efficiency of phase change materials and avoiding undesirable phase change processes in phase change materials that are not expected by design.

[0003] Double-tank molten salt energy storage is the most widely used molten salt tank layout mode in the molten salt energy storage field. It is mainly achieved by thermal circulation of hot molten salt tank and cold molten salt tank respectively. The production, packaging and layout of the two molten salt tanks have extremely high industrial costs, but the energy storage system is less complex and less difficult to control.

[0004] Single-tank molten salt energy storage is currently the best way to reduce the cost of double-tank molten salt energy storage. Using a single molten salt tank to replace a double molten salt tank significantly reduces the cost of production, packaging, and layout. However, there are two main core issues that restrict single-tank molten salt energy storage: first, the problem of thermal stress damage to the tank; second, the difficulty in controlling the thickness of the thermocline. At the same time, there are many technical requirements or projects to be optimized for single-tank molten salt energy storage: first, the upper hot molten salt zone has sufficient directional flow to ensure longitudinal uniformity and meet the "strong mixing" requirements of the thermocline; second, the molten salt thermocline should be as thin as possible to ensure that more space can be used for energy storage; third, the lower cold molten salt zone should reduce the flow of molten salt while ensuring uniformity in the horizontal direction to avoid partial phase change of the molten salt due to too little flow. Utility Model Content

[0005] In view of the application needs and defects existing in the above-mentioned engineering application practices, the utility model proposes a single-tank molten salt energy storage tank with thermocline coordinated automatic control, which can enhance the vertical temperature uniformity of the hot molten salt section, improve the horizontal temperature uniformity of the cold molten salt section and control the flow, reduce the momentum exchange between the thermocline area and other layers to reduce the difficulty of thermocline control. At the same time, the molten salt tank of the utility model can solve the problem of thermal stress damage of the tank body and the problem of mismatch between the thermal expansion coefficient of the composite phase change material and the tank body.

[0006] To achieve the above purpose, the utility model is implemented based on the following scheme:

[0007] A thermocline-coordinated self-controlled molten salt single-tank energy storage molten salt tank, comprising a tank cover and a tank body, wherein the tank body is divided into three sections from top to bottom, namely: a hot molten salt section, a thermocline section and a cold molten salt section; the inner walls of the hot molten salt section, the thermocline section and the cold molten salt section are respectively provided with a hot molten salt section composite phase change material skeleton, a thermocline section composite phase change material skeleton and a cold molten salt section composite phase change material skeleton; the hot molten salt section composite phase change material skeleton is continuously arranged, and the lowest surface is at a position of 52%-60% of the total height in the tank body; the thermocline section composite phase change material skeleton has multiple levels, with gaps between each level, and is located in the tank The composite phase change material skeleton of the cold molten salt section has multiple levels with gaps between each level, and the highest plane is located at 40%-48% of the total height of the tank body; the composite phase change material skeleton of the hot molten salt section is a porous ceramic skeleton with a pore size of PPI=15 and a porosity of 85%-95%; the composite phase change material skeleton of the thermocline section is a porous ceramic skeleton with a pore size of PPI=45 and a porosity of 55%-65%; the composite phase change material skeleton of the cold molten salt section is a porous ceramic skeleton with a pore size of PPI=35 and a porosity of 75%-85%.

[0008] By setting a thermocline section between the hot molten salt section and the cold molten salt section, and the composite phase change material of the inner wall of each section is a porous ceramic skeleton, and by optimizing and adjusting the porosity, pore size and layer setting of the porous ceramic, the longitudinal temperature gradient of the tank body can be adjusted, which can enhance the vertical temperature uniformity of the hot molten salt section, improve the horizontal temperature uniformity of the cold molten salt section and control the flow, reduce the momentum exchange between the thermocline zone and other layers, so as to reduce the difficulty of thermocline control.

[0009] Preferably, the tank cover is coaxially arranged with the tank body and has clearance fit, so as to ensure that static mechanical damage does not occur between the tank cover and the tank body under high temperature difference working conditions.

[0010] Preferably, the composite phase change material skeleton of the thermocline section is not connected to the composite phase change material skeleton of the hot molten salt section and the composite phase change material skeleton of the cold molten salt section, and there is a gap between them to leave a margin for thermal expansion and contraction of the material.

[0011] Preferably, a composite phase change material skeleton is also provided on the inner walls of the feed pipe and discharge pipe of the cold and hot molten salt to better cooperate with the temperature zone control. Specifically, a plurality of hot molten salt feed pipes and hot molten salt discharge pipes are provided on the hot tank body of the hot molten salt section; a plurality of cold molten salt feed pipes and cold molten salt discharge pipes are provided on the tank body of the cold molten salt section; a hot molten salt feed pipe composite phase change material skeleton is provided on the inner wall of the hot molten salt feed pipe, and a hot molten salt discharge pipe composite phase change material skeleton is provided on the inner wall of the hot molten salt discharge pipe. The composite phase change material skeleton of the hot molten salt feed pipe is a porous ceramic skeleton with a pore size of PPI=25 and a porosity of 85%-95%, and the composite phase change material skeleton of the hot molten salt discharge pipe is a porous ceramic skeleton with a pore size of PPI=35 and a porosity of 85%-95%; and the composite phase change material skeleton of the hot molten salt feed pipe and the hot molten salt The composite phase change material skeleton of the salt discharge pipe is connected to the composite phase change material skeleton of the hot molten salt section; the inner wall of the cold molten salt feed pipe is provided with a composite phase change material skeleton of the cold molten salt feed pipe, and the inner wall of the cold molten salt discharge pipe is provided with a composite phase change material skeleton of the cold molten salt feed pipe, and the composite phase change material skeleton of the cold molten salt feed pipe is a porous ceramic skeleton with a pore size of PPI=25 and a porosity of 85%-95%; the composite phase change material skeleton of the cold molten salt discharge pipe is a porous ceramic skeleton with a pore size of PPI=35 and a porosity of 85%-95%; and the composite phase change material skeleton of the cold molten salt feed pipe and the composite phase change material skeleton of the cold molten salt discharge pipe are connected to the composite phase change material skeleton of the cold molten salt section.

[0012] Preferably, the center of the feed port where the hot molten salt feed pipe intersects with the tank body is located at 85% of the total height of the tank body, and the center of the discharge port where the hot molten salt discharge pipe intersects with the tank body is located at 75% of the total height of the tank body; the center of the feed port where the cold molten salt feed pipe intersects with the tank body is opened at 25% of the total height of the tank body, and the center of the discharge port where the cold molten salt discharge pipe intersects with the tank body is opened at 15% of the total height of the tank body.

[0013] Preferably, the hot molten salt feed pipe and the cold molten salt feed pipe are arranged at an angle of 45° downward in the horizontal direction; the hot molten salt discharge pipe and the cold molten salt discharge pipe are arranged at an angle of 45° upward in the horizontal direction to ensure the startup performance of the molten salt tank and improve the safety of the molten salt when partial condensation occurs.

[0014] Preferably, there are four hot molten salt feed pipes, four hot molten salt discharge pipes, four cold molten salt feed pipes, and four cold molten salt discharge pipes, which are arranged in a circular array on the same horizontal plane.

[0015] Preferably, the can cover and the can body are both made of ceramic materials, so that the composite phase change material can be solidified on the can body by sintering, and the expansion coefficients can be well matched.

[0016] Preferably, the tank cover and the tank body are both made of silicon carbide ceramics, and the composite phase change material skeleton of the hot molten salt section, the composite phase change material skeleton of the thermocline section, and the composite phase change material skeleton of the cold molten salt section are all made of silicon carbide ceramic skeletons. Silicon carbide ceramics have an extremely low linear expansion coefficient, which can better solve the problem of thermal stress damage to the tank body and the problem of mismatch between the thermal expansion coefficients of the composite phase change material and the tank body.

[0017] Preferably, a heat-insulating layer is also provided outside the tank body to prevent the silicon carbide from dissipating heat too quickly.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model proposes a molten salt single-tank energy storage molten salt tank with coordinated automatic control of the thermocline, and a porous ceramic composite phase change material skeleton is arranged in the tank body. By optimizing the arrangement of the composite phase change material skeleton in each temperature zone, the vertical temperature uniformity of the hot molten salt section can be enhanced, the horizontal temperature uniformity of the cold molten salt section can be improved and the flow can be controlled, and the momentum exchange between the thermocline zone and other layers can be reduced to reduce the difficulty of thermocline control. Furthermore, the composite phase change material skeleton of the salt storage tank of the utility model can be fixed to the tank body by sintering, which can solve the problem of thermal stress damage of the tank body and the problem of mismatch between the thermal expansion coefficient of the composite phase change material and the tank body to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a molten salt single tank energy storage molten salt tank according to an embodiment of the utility model;

[0021] Figure 2 This is a top view of a molten salt single tank energy storage molten salt tank according to an embodiment of the utility model;

[0022] Figure 3 This is a bottom view of a molten salt single tank energy storage molten salt tank according to an embodiment of the utility model;

[0023] Figure 4 It is a perspective isometric view of the overall structure of a molten salt single tank energy storage molten salt tank according to an embodiment of the utility model;

[0024] Figure 5 An abstract perspective view of a composite phase change material skeleton of a molten salt single tank energy storage molten salt tank according to an embodiment of the utility model;

[0025] Legend: 1. Tank cover; 2. Tank body; 3. Composite phase change material skeleton of hot molten salt section; 4. Composite phase change material skeleton of thermocline section; 5. Composite phase change material skeleton of cold molten salt section; 6. Hot molten salt feed pipe; 7. Composite phase change material skeleton of hot molten salt feed pipe; 8. Hot molten salt discharge pipe; 9. Composite phase change material skeleton of hot molten salt discharge pipe; 10. Cold molten salt feed pipe; 11. Composite phase change material skeleton of cold molten salt feed pipe; 12. Cold molten salt discharge pipe; 13. Composite phase change material skeleton of cold molten salt feed pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The specific implementation of the utility model will be described below in conjunction with the schematic diagram of the utility model structure:

[0028] This implementation is intended to solve the problem of difficulty in controlling the thermocline of a single tank molten salt energy storage and insufficient available space. Simply isolating the hot molten salt section and the cold molten salt section will cause the hot and cold molten salt sections to be re-stratified in their respective intervals, resulting in a larger longitudinal temperature gradient in their respective spaces, thereby affecting the energy storage stability and output flexibility of the single tank. In response to this, the utility model provides a molten salt single tank energy storage molten salt tank with thermocline coordinated automatic control.

[0029] like Figure 1-5 As shown, a thermocline coordinated self-controlled molten salt single-tank energy storage molten salt tank includes a tank cover 1 and a tank body 2. The tank cover 1 and the tank body 2 are coaxially arranged and clearance-matched to ensure that there is no static mechanical damage between the tank cover 1 and the tank body under high temperature difference working conditions.

[0030] The tank body 2 is divided into three sections from top to bottom, namely: a hot molten salt section, a thermocline section and a cold molten salt section; the inner wall of the tank body 2 is provided with a porous ceramic composite phase change skeleton, namely a hot molten salt section composite phase change material skeleton 3 arranged on the inner wall of the hot molten salt section tank, a thermocline section composite phase change material skeleton 4 arranged on the inner wall of the thermocline section tank, and a cold molten salt section composite phase change material skeleton 5 arranged on the inner wall of the cold molten salt section tank.

[0031] Due to the difference in thermal expansion, the thermocline composite phase change material skeleton 4 is not connected to the hot molten salt composite phase change material skeleton 3 and the cold molten salt composite phase change material skeleton 5, and there is a gap between them to reserve a certain space for the thermal expansion and contraction of the materials.

[0032] Among them, the molten salt section composite phase change material skeleton 3 is an ultra-large pore size and high porosity porous ceramic skeleton; that is, a porous ceramic skeleton with a pore size of PPI = 25 and a porosity of 85%-95%; the molten salt section composite phase change material skeleton 3 is continuously arranged on the inner wall of the molten salt section tank body 2, and the lowest plane is at 52%-60% of the total height of the tank body (from the bottom to the top).

[0033] The thermocline section composite phase change material skeleton 4 is a porous ceramic skeleton with small pore size and low porosity; that is, a porous ceramic skeleton with a pore size of PPI=45 and a porosity of 55%-65%; the thermocline section composite phase change material skeleton 4 has multiple levels, which are arranged at intervals on the inner wall of the thermocline section tank 2, so that multi-level buffering can be provided to ensure that only heat exchange and a small amount of mass exchange exist in the thermocline area. The thermocline section composite phase change material skeleton 4 is located in the interval of 40%-60% of the total height of the tank.

[0034] The cold molten salt section composite phase change material skeleton 5 is a medium-pore diameter medium-porosity porous ceramic skeleton, that is, a porous ceramic skeleton with a pore diameter of PPI = 35 and a porosity of 75%-85%. The cold molten salt section composite phase change material skeleton 5 also has multiple levels, which are arranged on the inner wall of the cold molten salt section tank 2 at intervals, and the highest plane is located at 40%-48% of the total height of the tank, which can be adjusted according to the interval of the thermocline section.

[0035] The tank body is also provided with a hot molten salt feed pipe 6, a hot molten salt discharge pipe 8, a cold molten salt feed pipe 10, and a cold molten salt discharge pipe 12. The center of the feed port where the hot molten salt feed pipe 6 intersects with the tank body 2 is located at 85% of the total height of the tank body, and the center of the discharge port where the hot molten salt discharge pipe 8 intersects with the tank body 2 is located at 75% of the total height of the tank body. The center of the feed port where the cold molten salt feed pipe 10 intersects with the tank body 2 is opened at 25% of the total height of the tank body, and the center of the discharge port where the cold molten salt discharge pipe 12 intersects with the tank body 2 is opened at 15% of the total height of the tank body.

[0036] Furthermore, in order to better control the temperature zone, the inner wall of each inlet and outlet pipe is also provided with a porous ceramic composite phase change material skeleton, namely, a hot molten salt feed pipe composite phase change material skeleton 7, a hot molten salt outlet pipe composite phase change material skeleton 9, a cold molten salt feed pipe composite phase change material skeleton 11, and a cold molten salt outlet pipe composite phase change material skeleton 13.

[0037] Among them, the hot molten salt feed pipe composite phase change material skeleton 7 is an ultra-large pore size, high porosity porous ceramic skeleton (pore size is PPI = 25, porosity is 85%-95%), and the hot molten salt discharge pipe composite phase change material skeleton 9 is a medium pore size, high porosity ceramic skeleton (pore size is PPI = 35, porosity is 85%-95%); the hot molten salt feed pipe composite phase change material skeleton 7 and the hot molten salt discharge pipe composite phase change material skeleton 9 are connected to the hot molten salt section composite phase change material skeleton 3.

[0038] The composite phase change material skeleton 11 of the cold molten salt feed pipe is a large-pore, high-porosity ceramic skeleton (pore diameter is PPI=25, and porosity is 85%-95%); the composite phase change material skeleton 13 of the cold molten salt discharge pipe is a medium-pore, high-porosity ceramic skeleton (pore diameter is PPI=35, and porosity is 85%-95%); and the composite phase change material skeleton 11 of the cold molten salt feed pipe and the composite phase change material skeleton 13 of the cold molten salt discharge pipe are connected to the composite phase change material skeleton 5 of the cold molten salt section.

[0039] When using, refer to Figure 2 , Figure 5 The molten salt enters the tank 2 through the molten salt feed pipe 6, passes through the molten salt section composite phase change material skeleton 3 to achieve longitudinal temperature gradient reduction and temperature uniformity coordinated control, and then flows out through the molten salt discharge pipe 8 to participate in the Carnot heat engine cycle for energy output. In this process, the ultra-large pore size and high porosity porous ceramic material enhances thermal conductivity and ensures stable molten salt flow in the molten salt section with a small pressure drop, effectively ensuring the stability of the thermocline and significantly reducing the thickness of the thermocline. Figure 5 As shown, the molten salt forms a completely interconnected area in the tank 2, but the area where the small-aperture, low-porosity porous ceramic of the composite phase change material skeleton 4 is located in the thermocline section is greatly reduced in mass flow, ensuring that the mass flow disturbance formed in the upper and lower molten salt areas cannot be effectively transmitted to the thermocline area, thereby forming a stable thermocline area. The multi-level structure of the thermocline section ceramic composite phase change material skeleton 4 will build a multi-level buffer zone for the thermocline, ensuring that only heat exchange and a small amount of mass exchange exist in the thermocline area. Figure 3 As shown, cold molten salt enters the cold molten salt section composite phase change material skeleton 5 through the cold molten salt feed pipe 10. This section of the skeleton adopts a multi-stage design, which effectively controls the temperature uniformity in the horizontal direction while further reducing the pressure drop through the gaps between the multi-stage ceramic skeletons.

[0040] refer to Figure 4 , due to the spontaneous flow impression of the molten salt guided by the temperature gradient of the phase change material during the phase change process, the utility model sets a certain slope in the inlet and outlet pipes of each molten salt section to ensure the start-up performance of the molten salt tank and improve the safety of the molten salt when partial condensation occurs, reduce the re-phase change speed of the phase change material during condensation, and avoid excessive internal pressure when partial condensation occurs inside the tank, thereby greatly improving reliability. Among them, the hot molten salt feed pipe 6 and the cold molten salt feed pipe 10 are arranged at a 45° downward angle in the horizontal direction to ensure that the imported high-temperature molten salt can quickly open the inlet through the molten salt formed by the upper priority phase change. The hot molten salt discharge pipe 8 and the cold molten salt discharge pipe 12 are arranged at a 45° angle in the horizontal direction to ensure that the molten salt formed by the upper priority phase change can quickly open the inlet pipe when the molten salt is output.

[0041] In one embodiment, the hot molten salt feed pipe 6 and the cold molten salt feed pipe 10 are arranged at an angle of 45° downward in the horizontal direction, and a total of four are arranged in a circular array on the same horizontal plane; the hot molten salt discharge pipe 8 and the cold molten salt discharge pipe 12 are arranged at an angle of 45° upward in the horizontal direction, and a total of four are arranged in a circular array on the same horizontal plane.

[0042] In one embodiment, the can cover 1 and the can body 2 are both made of ceramic materials, so that the porous ceramic skeleton can be effectively consolidated with the can body by sintering after being impregnated with ceramic slurry to form a matching thermal expansion coefficient.

[0043] For example, in one embodiment, the tank cover 1 and the tank body 2 are both made of silicon carbide ceramics with strong mechanical strength formed by pressureless sintering of silicon carbide powder in a nitrogen environment, and the hot molten salt section composite phase change material skeleton 3, the thermocline section composite phase change material skeleton 4, and the cold molten salt section composite phase change material skeleton 5 are all silicon carbide ceramic skeletons. The silicon carbide ceramic material of the tank body enables it to be directly sintered with the silicon carbide porous ceramic composite phase change material skeleton to form a structure with the same thermal expansion coefficient, and has strong thermal stability. In addition, the linear expansion coefficient of silicon carbide ceramics is extremely low, which can better solve the problem of thermal stress damage of the tank body and the problem of mismatch between the thermal expansion coefficient of the composite phase change material and the tank body. Although silicon carbide has a high thermal conductivity and is easy to dissipate heat, this can be solved by simply setting an insulating material insulation layer on the periphery of the tank body 2.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A thermocline coordinated automatic control molten salt single tank energy storage molten salt tank, characterized in that: It comprises a tank cover (1) and a tank body (2), wherein the tank body is divided into three sections from top to bottom, namely: a hot molten salt section, a thermocline section and a cold molten salt section; The inner walls of the tanks of the hot molten salt section, the thermocline section and the cold molten salt section are respectively provided with a hot molten salt section composite phase change material skeleton (3), a thermocline section composite phase change material skeleton (4) and a cold molten salt section composite phase change material skeleton (5); The hot molten salt section composite phase change material skeleton (3) is continuously arranged, and the lowest surface is located at 52%-60% of the total height of the tank body; the thermocline section composite phase change material skeleton (4) has multiple levels, with gaps between each level, and is located at 40%-60% of the total height of the tank body; the cold molten salt section composite phase change material skeleton (5) has multiple levels, with gaps between each level, and the highest plane is located at 40%-48% of the total height of the tank body; The hot molten salt section composite phase change material skeleton (3) is a porous ceramic skeleton with a pore size of PPI = 15 and a porosity of 85%-95%; the thermocline section composite phase change material skeleton (4) is a porous ceramic skeleton with a pore size of PPI = 45 and a porosity of 55%-65%; the cold molten salt section composite phase change material skeleton (5) is a porous ceramic skeleton with a pore size of PPI = 35 and a porosity of 75%-85%.

2. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 1 is characterized in that: The tank cover (1) and the tank body (2) are coaxially arranged and clearance-matched.

3. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 1 is characterized in that: The thermocline section composite phase change material skeleton (4) is not connected to the hot molten salt section composite phase change material skeleton (3) and the cold molten salt section composite phase change material skeleton (5), and there is a gap between them.

4. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 1 is characterized in that: The hot molten salt section tank body is provided with a plurality of hot molten salt feed pipes (6) and hot molten salt discharge pipes (8); the cold molten salt section tank body is provided with a plurality of cold molten salt feed pipes (10) and cold molten salt discharge pipes (12); The inner wall of the molten salt feed pipe (6) is provided with a molten salt feed pipe composite phase change material skeleton (7), and the inner wall of the molten salt discharge pipe (8) is provided with a molten salt discharge pipe composite phase change material skeleton (9); the molten salt feed pipe composite phase change material skeleton (7) is a porous ceramic skeleton with a pore size of PPI=25 and a porosity of 85%-95%, and the molten salt discharge pipe composite phase change material skeleton (9) is a porous ceramic skeleton with a pore size of PPI=35 and a porosity of 85%-95%; and the molten salt feed pipe composite phase change material skeleton (7) and the molten salt discharge pipe composite phase change material skeleton (9) are connected to the molten salt section composite phase change material skeleton (3); The inner wall of the cold molten salt feed pipe (10) is provided with a cold molten salt feed pipe composite phase change material skeleton (11), and the inner wall of the cold molten salt discharge pipe (12) is provided with a cold molten salt discharge pipe composite phase change material skeleton (13); the cold molten salt feed pipe composite phase change material skeleton (11) is a porous ceramic skeleton with a pore size of PPI=25 and a porosity of 85%-95%; the cold molten salt discharge pipe composite phase change material skeleton (13) is a porous ceramic skeleton with a pore size of PPI=35 and a porosity of 85%-95%; and the cold molten salt feed pipe composite phase change material skeleton (11) and the cold molten salt discharge pipe composite phase change material skeleton (13) are connected to the cold molten salt section composite phase change material skeleton (5).

5. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 4 is characterized in that: The center of the feed port where the hot molten salt feed pipe (6) intersects with the tank body (2) is located at 85% of the total height of the tank body, and the center of the discharge port where the hot molten salt discharge pipe (8) intersects with the tank body (2) is located at 75% of the total height of the tank body; the center of the feed port where the cold molten salt feed pipe (10) intersects with the tank body (2) is opened at 25% of the total height of the tank body, and the center of the discharge port where the cold molten salt discharge pipe (12) intersects with the tank body (2) is opened at 15% of the total height of the tank body.

6. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 4 is characterized in that: The hot molten salt feed pipe (6) and the cold molten salt feed pipe (10) are arranged at an angle of 45° downward in the horizontal direction; and the hot molten salt discharge pipe (8) and the cold molten salt discharge pipe (12) are arranged at an angle of 45° upward in the horizontal direction.

7. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 4 is characterized in that: There are four hot molten salt feed pipes (6), four hot molten salt discharge pipes (8), four cold molten salt feed pipes (10), and four cold molten salt discharge pipes (12), which are arranged in a circular array on the same horizontal plane.

8. The thermocline coordinated automatic control molten salt single tank energy storage molten salt tank according to claim 1 is characterized in that: The tank cover (1) and the tank body (2) are both made of ceramic materials.

9. The thermocline coordinated automatic molten salt single tank energy storage molten salt tank according to claim 8 is characterized in that: The tank cover (1) and the tank body (2) are both made of silicon carbide ceramics, and the hot molten salt section composite phase change material skeleton (3), the thermocline section composite phase change material skeleton (4), and the cold molten salt section composite phase change material skeleton (5) are all made of silicon carbide ceramic skeletons.

10. The thermocline coordinated automatic control molten salt single tank energy storage molten salt tank according to claim 9, characterized in that: A heat-insulating layer is also provided outside the tank body (2).

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