Thermal insulation structure of fused salt storage tank

Abstract

The utility model discloses a heat preservation structure of a fused salt storage tank. The heat preservation structure comprises a vacuum heat preservation layer arranged on the outer side of a tank body. The solid heat preservation layer is arranged on the outer side of the vacuum heat preservation layer. According to the scheme, the vacuum condition of the vacuum heat preservation layer is utilized, heat loss caused by two heat transfer modes of heat conduction and heat convection is reduced, the solid heat preservation layer is matched, a double-layer heat preservation structure is achieved, the outward heat transfer rate is reduced, and therefore the heat preservation effect is improved; the structure is simple, and maintenance and overhaul are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar energy photo-thermal energy storage system technical field, concretely relates to a molten salt storage tank heat preservation structure. BACKGROUND

[0002] In the current photo-thermal power station, the double-tank heat storage system with molten salt as heat storage medium has become the most common heat storage technology. Whether it is a trough type or a tower type system, it contains low-temperature and high-temperature molten salt tanks. These tanks are crucial to the overall safety of the power station while ensuring the efficiency of the heat storage system. During both operation and shutdown of the power station, the molten salt in the cold and hot molten salt tanks must always be kept above the melting point to remain in a liquid state. The temperature of the molten salt in the hot tank needs to be stabilized at about 400℃, and the temperature drop rate should not exceed 1.6℃; while the temperature of the molten salt in the cold tank needs to be maintained at about 290℃. Therefore, high requirements are placed on the heat preservation performance of the molten salt tank.

[0003] The existing molten salt tank wall insulation layer generally uses mineral wool, aluminum silicate, etc. as the insulation material. The thickness of the tank wall insulation layer is determined according to the thermal properties of the insulation material and the temperature of the molten salt in the tank. Despite the use of insulation materials, due to limitations in material properties, thickness, construction quality, and other factors, the insulation effect often fails to reach the best state, resulting in significant heat loss. In order to achieve a certain insulation effect, the insulation structure design of the existing storage tank is often complex, which not only increases the construction difficulty and cost, but also makes maintenance and repair work more difficult. SUMMARY

[0004] The utility model provides a kind of molten salt storage tank heat preservation structure, utilize the vacuum condition of vacuum insulation layer, reduce the heat loss caused by two kinds of heat transfer modes of heat conduction and heat convection, cooperate entity insulation layer, realize double-layer heat preservation structure, reduce the rate of heat transfer to outside, to improve insulation effect;Simple structure, easy to maintain and overhaul.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] The utility model provides a kind of molten salt storage tank heat preservation structure, comprising:

[0007] Vacuum insulation layer is arranged outside the tank body;

[0008] Entity insulation layer is arranged outside the vacuum insulation layer;

[0009] The vacuum insulation layer comprises:

[0010] Inner cylinder is arranged outside the tank body;

[0011] Outer cylinder is arranged outside the inner cylinder, and the outer cylinder is located inside the entity insulation layer;

[0012] A vacuum cavity is formed between the outer cylinder and the inner cylinder;

[0013] A second expansion joint is arranged on the outer cylinder;

[0014] A third expansion joint is arranged on the inner cylinder.

[0015] Optionally, the vacuum insulation layer further comprises:

[0016] A vacuum valve, an air inlet end of the vacuum valve being in communication with the vacuum cavity, and an air outlet end of the vacuum valve being connected with a vacuum pump.

[0017] Optionally, the vacuum valve is connected outside the top of the solid insulation layer, and the air inlet end of the vacuum valve is coaxially arranged with the vacuum cavity.

[0018] Optionally, the second expansion joint is close to the junction of the cylinder wall and the cylinder top of the outer cylinder.

[0019] Optionally, the third expansion joint is close to the junction of the cylinder wall and the cylinder top of the inner cylinder.

[0020] Optionally, the molten salt storage tank insulation structure further comprises:

[0021] A first expansion joint is arranged on the solid insulation layer.

[0022] Optionally, the first expansion joint is close to the junction of the outer wall and the top of the solid insulation layer.

[0023] The above-mentioned scheme of the utility model has at least the following beneficial effects:

[0024] The above-mentioned scheme of the utility model utilizes the vacuum condition of the vacuum insulation layer, reduces heat loss caused by two heat transfer modes of heat conduction and heat convection, cooperates with the solid insulation layer, realizes double-layer insulation structure, reduces the rate of heat transfer to the outside, thereby improving the insulation effect; the structure is simple, and maintenance and overhaul are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of a molten salt storage tank insulation structure provided by an embodiment of the utility model;

[0026] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0027] The following is a description of the reference signs:

[0028] 1, tank body; 2, inner cylinder; 3, vacuum cavity; 4, outer cylinder; 5, solid insulation layer; 6, vacuum valve; 7, first expansion joint; 8, second expansion joint; 9, third expansion joint. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and so that the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0030] As Figures 1-2 shown, the utility model provides a kind of fused salt storage tank heat preservation structure, comprising:

[0031] Vacuum insulation layer is arranged on the outside of tank body 1;

[0032] Solid heat preservation layer 5 is arranged on the outside of vacuum insulation layer.

[0033] In this embodiment, the vacuum condition of vacuum insulation layer is utilized to reduce heat loss caused by two heat transfer modes of heat conduction and heat convection, and solid heat preservation layer 5 is matched to realize double-layer heat preservation structure, reduce the rate of heat transfer to the outside, so as to improve heat preservation effect;Simple structure reduces the complexity of heat preservation structure design, is convenient for maintenance and overhaul, so as to reduce operating cost, and ensure the safe and stable operation of storage tank.

[0034] In an optional embodiment of the utility model, the vacuum insulation layer comprises:

[0035] Inner cylinder 2 is arranged on the outside of tank body 1;

[0036] Outer cylinder 4 is arranged on the outside of inner cylinder 2, and outer cylinder 4 is located inside solid heat preservation layer 5;

[0037] Vacuum cavity 3 is formed between outer cylinder 4 and inner cylinder 2.

[0038] In this embodiment, vacuum insulation layer is composed of inner cylinder 2, vacuum cavity 3 and outer cylinder 4, and the vacuum condition of vacuum insulation layer is utilized to reduce heat loss caused by two heat transfer modes of heat conduction and heat convection, and improve heat preservation effect.

[0039] In an optional embodiment of the utility model, the vacuum insulation layer further comprises:

[0040] Vacuum valve 6, the air inlet end of vacuum valve 6 is communicated with vacuum cavity 3, and the air outlet end of vacuum valve 6 is connected with vacuum pump.

[0041] In this embodiment, the vacuum degree of vacuum cavity 3 can be adjusted by vacuum valve 6 matched with vacuum pump, so as to ensure the vacuum effect of vacuum insulation layer, and improve heat preservation effect.

[0042] In the optional embodiment of the utility model, vacuum valve 6 is connected at the top outside of solid heat preservation layer 5, and the air inlet end of vacuum valve 6 is coaxially arranged with vacuum cavity 3.

[0043] In the embodiment, by arranging vacuum valve 6 at the top of solid heat preservation layer 5, and coaxially arranging the air inlet end of vacuum valve 6 with vacuum cavity 3, the vacuumizing effect and efficiency of vacuum valve 6 and vacuum pump on vacuum cavity 3 can be improved.

[0044] In the optional embodiment of the utility model, the vacuum heat preservation layer further comprises:

[0045] Second expansion joint 8 is arranged on outer cylinder body 4.

[0046] In the embodiment, by arranging second expansion joint 8 on outer cylinder body 4, the thermal deformation and cracking of outer cylinder body 4 under high temperature can be effectively reduced through second expansion joint 8, and the safety of outer cylinder body 4 is enhanced.

[0047] In the optional embodiment of the utility model, second expansion joint 8 is close to the joint of the cylinder wall and the cylinder top of outer cylinder body 4.

[0048] In the embodiment, there is a temperature difference between the cylinder wall and the cylinder top of outer cylinder body 4, and by arranging second expansion joint 8 close to the joint of the cylinder wall and the cylinder top of outer cylinder body 4, the thermal deformation protection effect of second expansion joint 8 on outer cylinder body 4 can be ensured.

[0049] In the optional embodiment of the utility model, the vacuum heat preservation layer further comprises:

[0050] Third expansion joint 9 is arranged on inner cylinder body 2.

[0051] In the embodiment, by arranging third expansion joint 9 on inner cylinder body 2, the thermal deformation and cracking of inner cylinder body 2 under high temperature can be effectively reduced through third expansion joint 9, and the safety of inner cylinder body 2 is enhanced.

[0052] In the optional embodiment of the utility model, third expansion joint 9 is close to the joint of the cylinder wall and the cylinder top of inner cylinder body 2.

[0053] In the embodiment, there is a temperature difference between the cylinder wall and the cylinder top of inner cylinder body 2, and by arranging third expansion joint 9 close to the joint of the cylinder wall and the cylinder top of inner cylinder body 2, the thermal deformation protection effect of third expansion joint 9 on inner cylinder body 2 can be ensured.

[0054] In the optional embodiment of the utility model, the molten salt storage tank heat preservation structure further comprises:

[0055] First expansion joint 7 is arranged on solid heat preservation layer 5.

[0056] In the embodiment, the first expansion joint 7 is arranged on the solid thermal insulation layer 5, and the first expansion joint 7 can effectively reduce thermal deformation and cracking of the solid thermal insulation layer 5 under high temperature and enhance safety of the solid thermal insulation layer 5.

[0057] In the optional embodiment of the utility model, the first expansion joint 7 is close to the intersection of the outer wall and the top of the solid thermal insulation layer 5.

[0058] In the embodiment, there is a temperature difference between the outer wall and the top of the solid thermal insulation layer 5, the first expansion joint 7 is arranged close to the intersection of the outer wall and the top of the solid thermal insulation layer 5, and the thermal deformation protection effect of the first expansion joint 7 on the solid thermal insulation layer 5 can be ensured.

[0059] The above is the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A thermal insulation structure for a molten salt storage tank, characterized in that: include: A vacuum insulation layer is installed on the outside of the tank body (1); Solid insulation layer (5) disposed on the outside of the vacuum insulation layer; The vacuum insulation layer includes: The inner cylinder (2) is disposed on the outside of the tank (1); An outer cylinder (4) is disposed outside the inner cylinder (2), and the outer cylinder (4) is located inside the solid insulation layer (5); A vacuum cavity (3) is formed between the outer cylinder (4) and the inner cylinder (2); The second expansion joint (8) is provided on the outer cylinder (4); The third expansion joint (9) is provided on the inner cylinder (2).

2. The molten salt storage tank insulation structure according to claim 1, characterized in that, The vacuum insulation layer also includes: Vacuum valve (6), the inlet end of the vacuum valve (6) is connected to the vacuum chamber (3), and the outlet end of the vacuum valve (6) is connected to the vacuum pump.

3. The molten salt storage tank insulation structure according to claim 2, characterized in that, The vacuum valve (6) is connected to the top outer side of the solid insulation layer (5), and the air inlet of the vacuum valve (6) is coaxially arranged with the vacuum chamber (3).

4. The molten salt storage tank insulation structure according to claim 1, characterized in that, The second expansion joint (8) is located near the junction of the outer cylinder wall and the top of the outer cylinder (4).

5. The molten salt storage tank insulation structure according to claim 1, characterized in that, The third expansion joint (9) is located near the junction of the inner cylinder (2) wall and top.

6. The molten salt storage tank insulation structure according to claim 1, characterized in that, Also includes: The first expansion joint (7) is disposed on the solid insulation layer (5).

7. The molten salt storage tank insulation structure according to claim 6, characterized in that, The first expansion joint (7) is located near the junction of the outer wall and top of the solid insulation layer (5).

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