Foundation heat preservation structure of fused salt storage tank

Abstract

The utility model relates to the technical field of fused salt energy storage, in particular to a foundation heat preservation structure of a fused salt storage tank. Modularized calcium silicate plates are adopted to replace refractory bricks to serve as main circumferential heat insulation materials, the multiple calcium silicate plates are detachably spliced to form the annular structure layer, operation is easy, disassembly is convenient, meanwhile, a shallow refractory brick structure is arranged on the inner side of the calcium silicate plate layer and used for effectively bearing the load of the storage tank, and the service life of the storage tank is prolonged. On the premise that the foundation heat preservation structure meets the heat preservation and bearing requirements, the construction process is greatly simplified, construction is more convenient and efficient, maintenance is convenient, and cost is low. And the excellent thermodynamic property of the calcium silicate board is also beneficial to obviously reducing the circumferential heat loss, so that the overall heat preservation effect of the fused salt storage tank foundation structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fused salt energy storage, especially to a foundation heat preservation structure of fused salt storage tank. BACKGROUND

[0002] With the development of various photothermal fused salt energy storage projects at home and abroad, remarkable progress has been made in recent years, and the industry has higher requirements for the power generation scale of in-service and under-construction projects for storage tanks. During the operation of the photothermal fused salt storage tank, the high-temperature molten salt stored therein has relatively high thermal energy, and therefore the foundation heat loss is relatively large. In order to effectively reduce these heat losses, it is particularly important to perform heat insulation treatment on the ring wall part of the storage tank. The existing ring wall is laid with refractory bricks from bottom to top, but this scheme has some obvious shortcomings. First, the thermal conductivity of refractory bricks is usually high, and the heat insulation performance is low. In addition, refractory bricks usually have high porosity, which makes them prone to looseness, cracking or gap formation when subjected to external loads. This not only increases the complexity of construction, making the construction process more cumbersome and time-consuming, but also may result in difficulty in ensuring construction quality.

[0003] In addition, the maintenance of refractory bricks is relatively difficult. Once a problem occurs, large-scale replacement or repair is often required, which is time-consuming and labor-intensive, and even increases the construction cost. Therefore, although refractory bricks have some unique performance advantages, their disadvantages are more prominent in this application scenario, and they have great limitations in actual application.

[0004] Therefore, there is an urgent need for a more efficient and reliable foundation structure with lower cost to improve the heat loss problem of photothermal fused salt storage tanks. SUMMARY

[0005] (I) Technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a foundation heat preservation structure of fused salt storage tank, which solves the problems of the traditional foundation structure, such as the whole laying of refractory bricks from top to bottom at the ring wall, the complicated construction process, the relatively difficult maintenance once a problem occurs, the high maintenance cost and the difficulty in ensuring construction quality.

[0007] (II) Technical scheme

[0008] In order to achieve the above-mentioned purposes, the utility model adopts the main technical scheme comprising:

[0009] The utility model provides a kind of foundation heat preservation structure of fused salt storage tank, including ring wall part, center heat preservation layer part and foundation layer part.Ring wall part and center heat preservation layer part are set on foundation layer part, ring wall part surrounds outside center heat preservation layer part, and center heat preservation layer part is used to support fused salt storage tank.Ring wall part includes steel ring wall and at least one calcium silicate board layer, the calcium silicate board layer is annular structure by several pieces of calcium silicate board detachable splicing, and the upper and lower surfaces of the calcium silicate board layer are flush with the upper and lower surfaces of steel ring wall.When the number of calcium silicate board layer is multilayer, multilayer calcium silicate board layer is stacked along vertical direction, and the splicing joint of the calcium silicate board layer of upper and lower adjacent layers is circumferentially staggered arrangement.

[0010] Optionally, center heat preservation layer part includes fine sand cushion layer, sandy soil cushion layer, ceramsite soil layer and annular foundation bearing layer.Ceramsite soil layer, sandy soil cushion layer and fine sand cushion layer are sequentially stacked on foundation layer part from bottom to top, and are all along the central axis of fused salt storage tank Center-symmetric cylindrical shape.

[0011] Ceramsite soil layer is connected with the inner wall of calcium silicate board layer, and the lower surface of ceramsite soil layer is flush with the lower surface of calcium silicate board layer.The width dimension of fine sand cushion layer and sandy soil cushion layer along the radial direction of fused salt storage tank is less than that of ceramsite soil layer, and annular foundation bearing layer is arranged between calcium silicate board layer and fine sand cushion layer and sandy soil cushion layer.The upper surface of annular foundation bearing layer is flush with the upper surface of fine sand cushion layer and the upper surface of calcium silicate board layer.The outer edge of fused salt storage tank is located at the middle position of annular foundation bearing layer.

[0012] Optionally, annular foundation bearing layer includes steel fiber reinforced concrete layer and clay refractory brick layer, and steel fiber reinforced concrete layer is arranged above clay refractory brick layer, and the width dimension of steel fiber reinforced concrete layer along the radial direction of fused salt storage tank is greater than that of clay refractory brick layer.

[0013] Optionally, the ceramsite soil layer is separated into a horizontal multi-layer structure by a separation layer, which is a steel mesh or a ceramic fiber cloth.

[0014] Optionally, the calcium silicate board layer is arranged in a three-layer structure, which includes an outer calcium silicate board layer, an intermediate foam glass layer and an inner calcium silicate board layer from outside to inside. The outer and inner calcium silicate board layers are curved calcium silicate boards, and the splicing surfaces between each curved calcium silicate board along the circumference of the fused salt storage tank are arranged in a mortise and tenon structure and connected by mortise and tenon to form an annular structure layer. The intermediate foam glass layer is arranged between the outer and inner calcium silicate board layers. When the number of calcium silicate board layers is multiple, the multiple calcium silicate board layers are all three-layer structures, and the splicing joints of the outer calcium silicate board layers of the upper and lower adjacent layers and the splicing joints of the inner calcium silicate board layers of the upper and lower adjacent layers are circumferentially staggered arranged.

[0015] Optionally, the thickness ratio of the outer calcium silicate plate layer, the intermediate foam glass layer and the inner calcium silicate plate layer along the radial direction of the molten salt storage tank is 1:1:2. The intermediate foam glass layer is an annular structure layer formed by detachably splicing foam glass wool boards, and the splicing seams of the intermediate foam glass layer are circumferentially staggered with the splicing seams of the outer calcium silicate plate layers and the splicing seams of the inner calcium silicate plate layers.

[0016] Optionally, the base layer part comprises an annular concrete layer and a fine gravel layer, the width of the annular concrete layer is greater than the sum of the widths of the steel ring wall and the calcium silicate plate layer, and the steel ring wall and the calcium silicate plate layer are arranged at the middle position of the annular concrete layer. The fine gravel layer is arranged inside the annular concrete layer, and the upper and lower surfaces of the fine gravel layer are flush with the upper and lower surfaces of the annular concrete layer, and the upper surface of the fine gravel layer is connected with the central heat preservation layer part.

[0017] Optionally, a plurality of ventilation pipes are horizontally buried at the middle position of the fine gravel layer.

[0018] Optionally, the ring wall part further comprises an elastic connection layer arranged between the steel ring wall and the calcium silicate plate layer.

[0019] Optionally, the base heat preservation structure formed by the ring wall part, the central heat preservation layer part and the base layer part is partially buried below the ground, and the buried height is more than half of the height of the steel ring wall.

[0020] (Three) beneficial effects

[0021] The beneficial effects of the utility model are:

[0022] The base heat preservation structure of the molten salt storage tank of the utility model adopts modular calcium silicate plates to replace firebricks as the main circumferential heat insulation material, a plurality of calcium silicate plates are detachably spliced to form an annular structure layer, which is simple to operate and convenient to disassemble, greatly simplifies the construction process, makes the construction more convenient and efficient, and is convenient to maintain and low in cost. Meanwhile, the excellent thermodynamic performance of the calcium silicate plate also helps to significantly reduce the circumferential heat loss, thereby improving the overall heat preservation effect of the base structure of the molten salt storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic view of embodiment 1 of the base heat preservation structure of the molten salt storage tank of the utility model;

[0024] Figure 2 It is a schematic view of embodiment 2 of the base heat preservation structure of the molten salt storage tank of the utility model;

[0025] Figure 3 It is Figure 2 It is a structural schematic view of the calcium silicate plate layer.

[0026] REFERENCE NUMERALS

[0027] 1: ring wall part; 11: steel ring wall; 12: calcium silicate board layer; 121: outer calcium silicate board layer; 122: intermediate foam glass layer; 123: inner calcium silicate board layer; 13: elastic connecting layer;

[0028] 2: central heat preservation layer part; 21: fine sand cushion layer; 22: sandy soil cushion layer; 23: ceramsite soil layer; 231: isolation layer; 24: annular foundation bearing layer; 241: steel fiber reinforced concrete layer; 242: clay firebrick layer;

[0029] 3: foundation layer part; 31: annular concrete layer; 32: fine gravel layer; 321: ventilation pipe;

[0030] 10: molten salt storage tank. DETAILED DESCRIPTION

[0031] In order to better explain the utility model, so as to facilitate understanding, below, by specific implementation, the utility model is described in detail. In which, the "upper", "lower", "inner", "outer" and other orientation terms mentioned in this paper are with the orientation of the reference, that is, the lava storage tank is normally located on a horizontal plane, the tank top direction is upper, the tank bottom direction is lower, the direction close to the central axis of the storage tank is inner, and the direction away from the central axis of the storage tank is outer. Figure 1

[0032] The utility model embodiment proposes a kind of foundation heat preservation structure of molten salt storage tank, it uses modular calcium silicate board to replace firebrick as the main heat insulation material of circumference, and shallow firebrick structure is set in the inner side of calcium silicate board, by this double-layer protection measures, under the premise that the heat preservation foundation can effectively bear the load of storage tank, greatly simplify the construction process, make construction more convenient, reduce construction difficulty.Calcium silicate board material itself good heat preservation performance and temperature resistance, further make foundation part can more effectively insulate heat radiation, ensure that in the service life of entire storage tank, the heat insulation performance of foundation part will not be reduced due to environmental factors or material aging, and in the case of insufficient light bad weather or longer night, by increasing the release of heat energy to continue to generate electricity, so as to improve the overall efficiency and stability of power generation system.

[0033] In order to better understand the above technical solutions, the exemplary embodiments of the utility model will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the utility model and to convey the complete scope of the utility model to those skilled in the art.

[0034] Example 1:​

[0035] Referring to Figure 1 The base heat preservation structure of the molten salt storage tank shown in the embodiment comprises a ring wall part 1, a center heat preservation layer part 2 and a base layer part 3, the ring wall part 1 and the center heat preservation layer part 2 are arranged on the base layer part 3, the ring wall part 1 surrounds the outside of the center heat preservation layer part 2, and the center heat preservation layer part 2 is used to support the molten salt storage tank 10.

[0036] The ring wall part 1 comprises a steel ring wall 11 and at least one layer of calcium silicate board layer 12, and the upper and lower surfaces of the calcium silicate board layer 12 are flush with the upper and lower surfaces of the steel ring wall 11 (that is, the thickness of the calcium silicate board layer 12 in the height direction is consistent with the height of the steel ring wall 11). In the embodiment, the steel ring wall 11 is an annular structure formed by welding, which wraps the heat preservation material and the bearing structure, provides protection in multiple aspects, ensures the integrity of the overall structure, and prevents relative displacement or separation of the layers during high-temperature operation. The steel ring wall 11 preferably uses low-alloy high-strength steel plate, which is a kind of low-alloy high-strength structural steel with good mechanical properties and corrosion resistance, suitable for long-term use in high-temperature and corrosive environments, and is very suitable for the peripheral setting of the base. The specification of the steel ring wall 11 is preferably 30-40 mm thick. Of course, the present application is not limited to this, and those skilled in the art can select other materials and sizes of the steel ring wall 11 according to actual needs, but the selected material should have good corrosion resistance.

[0037] The calcium silicate plate layer 12 is an annular structure formed by detachably splicing several calcium silicate plates. When the number of calcium silicate plate layers 12 is multiple layers, the multiple calcium silicate plate layers 12 are stacked along the vertical direction, and the splicing joints of the calcium silicate plate layers 12 of the adjacent layers are arranged in the circumferential direction. The connection between the calcium silicate plates can be to set them as plate materials with a dovetail structure and connect them through the dovetail, or can be connected through fasteners. However, it should be noted that in a high-temperature environment, the calcium silicate plate will expand, so a certain expansion gap should be ensured between the plates during connection, which helps to avoid local stress concentration caused by temperature changes and ensures the thermal stability of the material. This modular and detachable design makes the laying of the calcium silicate plate layer 12 very convenient, can greatly simplify the construction process, is convenient for maintenance, and reduces the maintenance cost. At the same time, the thermal conductivity of the calcium silicate plate is usually between 0.1-0.2 W / m·K, has good heat preservation performance and temperature resistance, and the material itself can work stably at a temperature of 650℃ or even higher. It can maintain good dimensional stability under the influence of high-temperature molten salt for a long time, avoid structural changes or stress concentration caused by thermal expansion or shrinkage, and is not easy to deform, crack or degrade when heated, and can be used to provide direct high-temperature insulation protection and effectively block the heat transfer path, thereby significantly reducing heat loss. In the embodiment, each calcium silicate plate in the calcium silicate plate layer 12 is a single-layer structure, and the thickness of the calcium silicate plate along the radial direction of the molten salt storage tank 10 is preferably set to be between 200mm-350mm. When the calcium silicate plate layer 12 is multiple layers above and below, the circumferential offset size of the splicing joints of the calcium silicate plate layers 12 of the adjacent layers above and below should be greater than or equal to 100mm. Of course, in other embodiments of the utility model, only one calcium silicate plate layer 12 can be provided.

[0038] Considering the difference in thermal expansion coefficients between the calcium silicate plate and the steel plate, a certain expansion gap is left between the steel ring wall 11 and the calcium silicate plate layer 12 during installation, and an elastic connection layer 13 is added in the gap to prevent the steel plate and the calcium silicate plate from being extruded after thermal displacement and causing material cracking. The elastic connection layer 13 preferably uses flexible graphite gaskets or expanded graphite winding gaskets and other high-temperature-resistant elastic members. This connection method can effectively absorb thermal stress caused by temperature changes while ensuring sealing performance and avoiding the generation of thermal bridge effect.

[0039] The central insulation layer part 2 comprises a fine sand cushion layer 21, a sandy soil cushion layer 22, a ceramsite soil layer 23 and an annular foundation bearing layer 24. The ceramsite soil layer 23, the sandy soil cushion layer 22 and the fine sand cushion layer 21 are stacked in sequence from bottom to top on the foundation layer part 3, and are all in a central symmetrical cylindrical shape along the central axis of the molten salt storage tank 10. The ceramsite soil layer 23 is in contact with the inner wall of the calcium silicate board layer 12, and the lower surface of the ceramsite soil layer 23 is flush with the lower surface of the calcium silicate board layer 12. The width dimension of the fine sand cushion layer 21 and the sandy soil cushion layer 22 in the radial direction of the molten salt storage tank 10 is smaller than that of the ceramsite soil layer 23, and the annular foundation bearing layer 24 is arranged between the calcium silicate board layer 12 and the fine sand cushion layer 21 and the sandy soil cushion layer 22. The upper surface of the annular foundation bearing layer 24 is flush with the upper surface of the fine sand cushion layer 21 and the upper surface of the calcium silicate board layer 12. The outer edge of the molten salt storage tank 10 is located at the middle position of the annular foundation bearing layer 24.

[0040] The fine sand cushion layer 21 and the sandy soil cushion layer 22 can play a good buffering role in the foundation structure. When the molten salt storage tank 10 is in operation, the tank bottom has a high temperature, and the foundation structure is easily affected by temperature fluctuations. By arranging the fine sand cushion layer 21 and the sandy soil cushion layer 22 in direct contact with the tank bottom, the thermal expansion coefficient of the sand and fine sand is low, which can maintain good physical properties in a high temperature environment, is not easy to chemically decompose or material degradation, and can maintain relatively stable mechanical properties at high temperatures, and will not fail due to long-term high temperature exposure, so it can better cope with the high temperature and temperature changes at the tank bottom position. At the same time, arranging the fine sand cushion layer 21 above the sandy soil cushion layer 22 can well fill the irregular areas of the foundation and can absorb part of the downward load of the molten salt storage tank 10. Specifically, when the foundation structure is subjected to the downward load of the storage tank, it acts on the fine sand cushion layer 21 first. The fine sand in the fine sand cushion layer 21 will flow slightly and penetrate into the sandy soil cushion layer 22 under the continuous action of the load, until a flat surface is formed at the tank bottom and a relatively stable mixed state is formed between the fine sand cushion layer 21 and the sandy soil cushion layer 22. It can not only level the top surface of the foundation structure to ensure that a uniform support surface is provided for the storage tank, but also disperses the tank load, so that the entire foundation structure can avoid large deformation due to thermal expansion or contraction, thereby reducing the foundation stress caused by temperature changes, preventing excessive displacement or uneven settlement of the tank bottom, and playing an important filling and adjusting role. At the same time, it can also provide certain drainage and ventilation capacity to ensure the stability and safety of the storage tank foundation during long-term use. In this embodiment, the thickness of the fine sand cushion layer 21 is preferably about 10-30 mm.

[0041] The ceramic soil layer 23 is used as a soft thermal insulation material in the central part of the infrastructure, which has good air permeability and drainage, can effectively prevent the risk of settlement caused by groundwater accumulation, and has good corrosion resistance and environmental adaptability, which helps to prolong the service life of the equipment and meets the needs of sustainable development, improves cost-effectiveness, and thus can prolong the service life of the storage tank system and reduce maintenance and repair costs. Specifically, the ceramic soil layer 23 is arranged inside the calcium silicate board layer 12, and the lower surface of the ceramic soil layer 23 is flush with the lower surface of the calcium silicate board layer 12. The ceramic soil layer 23 preferably uses shale ceramic soil, which is natural shale after high-temperature baking, has high-efficiency thermal insulation performance, can absorb and prevent heat radiation from the bottom of the molten salt storage tank 10 from being transmitted to the ground, thereby reducing the temperature rise of the underlying infrastructure. At the same time, the low-density characteristics of the ceramic soil make the overall structure of the ceramic soil layer 23 lighter, which can reduce the burden on the foundation. At the same time, as a main part of the central insulation layer part 2, the ceramic soil has good thermal insulation performance, and in addition, the ceramic soil has good bearing capacity, especially after compaction, which can provide stable support and prevent the storage tank structure from sinking or uneven settlement.

[0042] The annular foundation bearing layer 24 includes a steel fiber concrete layer 241 and a clay firebrick layer 242, wherein the steel fiber concrete layer 241 is arranged above the clay firebrick layer 242, and the width dimension of the steel fiber concrete layer 241 along the radial direction of the molten salt storage tank 10 is greater than the width dimension of the clay firebrick layer 242. Both are precisely placed in the high-stress concentration area directly bearing the load of the wall of the molten salt storage tank 10, so as to better support and bear the load of the entire storage tank, and ensure the stability, durability and safety of the storage tank structure during long-term operation. Specifically, the clay firebrick layer 242 and the steel fiber concrete layer 241 are stacked from bottom to top on the ceramic soil layer 23, the outer wall of the steel fiber concrete layer 241 and the clay firebrick layer 242 is attached to the inner wall of the calcium silicate board layer 12, and the inner wall of the steel fiber concrete layer 241 and the clay firebrick layer 242 is connected with the fine sand cushion layer 21 and the sand cushion layer 22.

[0043] The annular foundation bearing layer 24 is supported by a lower layer of clay firebrick 242, which provides additional high-temperature protection and insulation. This material maintains good structural integrity under high-temperature conditions, avoiding material softening or disintegration. It has excellent volume stability at high temperatures, with a low coefficient of thermal expansion, which helps to avoid significant volume changes during temperature fluctuations, thus preventing structural deformation due to high temperatures. Above the clay firebrick layer 242, a layer of steel fiber reinforced concrete 241 is poured, which can withstand significant loads in critical areas. The dispersion reinforcement of steel fibers greatly improves the tensile strength of the concrete, effectively resisting stress concentration due to thermal expansion and contraction, preventing concrete cracking. At the same time, its good wear resistance allows it to maintain surface integrity under long-term high loads, reducing wear and tear and extending service life. This makes the entire foundation structure more uniform in load bearing, with no obvious weak areas, better able to withstand various mechanical stresses during the operation of the molten salt storage tank 10, ensuring that the uneven settlement of the surface meets the requirements, thus ensuring the stability and safety of the entire structure. In this embodiment, the thickness of the clay firebrick layer 242 is preferably set to about 100 mm.

[0044] The foundation layer portion 3 includes an annular concrete layer 31 and a fine gravel layer 32. The width of the annular concrete layer 31 is greater than the sum of the widths of the steel ring wall 11 and the calcium silicate board layer 12, and the steel ring wall 11 and the calcium silicate board layer 12 are arranged in the middle of the annular concrete layer 31. In actual construction, an annular concrete layer 31 about 500 mm high is poured in the area below the steel ring wall 11 to provide a solid support foundation for the foundation structure itself and the molten salt storage tank 10. Because concrete has good compressive strength, it can bear the heavy weight of the storage tank system and distribute the load on the foundation to resist various stresses that may occur during the operation of the storage tank, especially the compressive stress generated when the storage tank is fully loaded. Then, a fine gravel layer 32 is laid in the central area of the annular concrete layer 31, with its upper and lower surfaces flush with the upper and lower surfaces of the annular concrete layer 31. The upper surface of the fine gravel layer 32 is connected to the central insulation layer portion 2 (i.e., to the ceramsite soil layer 23), and multiple groups of ventilation pipes 321 are horizontally embedded in the middle of the fine gravel layer 32 to deal with the possibility of overheating of the foundation structure under certain extreme conditions. In this way, heat can be effectively removed from the interior of the foundation structure, especially when the temperature below the ceramsite soil layer 23 exceeds 70°C. The ventilation pipes 321 can effectively reduce the foundation temperature, maintain the stability of the foundation temperature, reduce the accumulation of thermal stress, and prevent foundation cracking or local deformation due to thermal expansion. This design not only improves the durability of the foundation, but also ensures the stability and safety of the entire structure under various complex environments.

[0045] Meanwhile, the relative position between the foundation thermal insulation structure formed by the ring wall part 1, the center thermal insulation layer part 2 and the foundation layer part 3 as a whole and the ground can be adjusted according to the land conditions in different regions. In the embodiment, more than half of the entire foundation structure is buried below the ground, that is, more than half of the height of the steel ring wall 11 is arranged below the ground.

[0046] Embodiment 2

[0047] With reference to Figure 2 The foundation thermal insulation structure of the molten salt storage tank shown in the embodiment sets the calcium silicate board layer 12 as a three-layer structure including an outer calcium silicate board layer 121, an intermediate foam glass layer 122 and an inner calcium silicate board layer 123 from outside to inside. The outer calcium silicate board layer 121 and the inner calcium silicate board layer 123 are both curved calcium silicate boards, and are arranged in a mortise and tenon structure and connected by mortise and tenon to form an annular structure layer. The intermediate foam glass layer 122 is arranged between the outer calcium silicate board layer 121 and the inner calcium silicate board layer 123. In the embodiment, the total thickness of the calcium silicate board layer 12 along the radial direction of the molten salt storage tank 10 is between 300 mm and 400 mm, and the thickness ratio of the three-layer structure from outside to inside (that is, in the order of the outer calcium silicate board layer 121, the intermediate foam glass layer 122 and the inner calcium silicate board layer 123) is 1:1:2. The intermediate foam glass layer 122 is an annular structure layer formed by detachable splicing of foam glass wool boards. When multiple foam glass wool boards are spliced, the positions of the splicing seams should be circumferentially staggered with the splicing seams of the outer calcium silicate board layers 121 and the inner calcium silicate board layers 123 on both sides. The staggered size of the splicing seams between the inner and outer adjacent layers should be greater than or equal to 100 mm.

[0048] Therefore, in the embodiment, the calcium silicate board layer is formed by detachable splicing of the curved calcium silicate boards of the inner layer and the outer layer, and foam glass wool boards are added between the two layers to form an annular structure. The "calcium silicate board layer is an annular structure formed by detachable splicing of a plurality of calcium silicate boards" in the utility model means that the main part of the calcium silicate board layer is composed of calcium silicate boards, but other auxiliary materials can be added to increase the corresponding properties such as thermal insulation.

[0049] When the number of calcium silicate plate layers 12 is multiple layers, the multiple calcium silicate plate layers 12 are all three-layer structures, and the splicing joints of the outer calcium silicate plate layers 121 of the upper and lower adjacent layers and the splicing joints of the inner calcium silicate plate layers 123 of the upper and lower adjacent layers are also circumferentially staggered, and the size of the staggered splicing joints should be greater than or equal to 100 mm. The foam glass wool board filled in the curved calcium silicate plate is a porous structure, and the thermal conductivity is 0.039-0.065 W / m·K, which has a large number of closed pores, so that heat is not easily transmitted, thereby reducing heat loss, and the weight is relatively light, has the characteristics of corrosion resistance and no water absorption, which helps to reduce the overall structural burden, and is very suitable for application in high requirement environmental conditions, and the foam glass wool board has excellent compression performance and relatively strong compression strength, can uniformly bear a large external pressure, and is suitable for being used in heat preservation parts that need to bear lateral load. The three-layer structure heat preservation layer combined by the calcium silicate plate and the foam glass wool board can keep low thermal conductivity in a high temperature environment, thereby effectively preventing heat from being transmitted downward and reducing heat loss, and can fully play the advantages of both in heat insulation and compression, and can provide better heat preservation effect for the molten salt storage tank 10. In the embodiment, except for the improvement of the specific structure of the single calcium silicate plate in the calcium silicate plate layer 12, other parts are the same as those in Embodiment 1, and details are not described herein.

[0050] Embodiment 3:

[0051] The base heat preservation structure of the molten salt storage tank shown in the embodiment can further enhance the heat insulation effect, reduce the heat conduction between different layers, enhance the overall stability of the structure, help to uniformly distribute the upper load, and effectively prevent the occurrence of settlement and deformation by separating the ceramsite soil layer 23 into a transverse multi-layer structure through the isolation layer 231.

[0052] The isolation layer 231 can be a steel wire mesh or a ceramic fiber cloth. The ceramic fiber cloth itself has excellent heat preservation and high temperature resistance performance, and can provide additional heat insulation protection in a high temperature environment. The ceramsite soil layer 23 is preferably divided into four layers, and each layer has a thickness of about 300 mm-400 mm. In the embodiment, except for the structure improvement of the ceramsite soil layer 23, other parts are the same as those in Embodiment 1, and details are not described herein.

[0053] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0054] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect;Can be two element inside communication or two element mutual action relation.For ordinary skilled person in the art, can understand the specific meaning of above-mentioned terms in the utility model according to specific circumstances.

[0055] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature, which can be directly above or obliquely above the first feature, or simply means that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature, which can be directly below or obliquely below the first feature, or simply means that the first feature is lower than the second feature in horizontal height.

[0056] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0057] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled person in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the utility model.

Claims

1. A foundation heat insulation structure of a molten salt storage tank, comprising a ring wall portion (1), a center heat insulation layer portion (2) and a foundation layer portion (3), the ring wall portion (1) and the center heat insulation layer portion (2) are arranged on the foundation layer portion (3), the ring wall portion (1) surrounds outside the center heat insulation layer portion (2), and the center heat insulation layer portion (2) is used for supporting a molten salt storage tank (10), characterized in that: the ring wall portion (1) comprises a steel ring wall (11) and at least one layer of calcium silicate board layer (12); the calcium silicate board layer (12) is an annular structure formed by detachably splicing a plurality of calcium silicate boards, and upper and lower surfaces of the calcium silicate board layer (12) are flush with upper and lower surfaces of the steel ring wall (11); when the number of the calcium silicate board layer (12) is multiple layers, the multiple layers of the calcium silicate board layer (12) are vertically stacked, and the splicing seams of the calcium silicate board layers (12) of adjacent layers are circumferentially arranged in a staggered manner.

2. The foundation heat insulation structure of the molten salt storage tank according to claim 1, characterized in that: the center heat insulation layer portion (2) comprises a fine sand cushion layer (21), a sandy soil cushion layer (22), a ceramsite soil layer (23) and an annular foundation bearing layer (24); the ceramsite soil layer (23), the sandy soil cushion layer (22) and the fine sand cushion layer (21) are sequentially stacked on the foundation layer portion (3) from bottom to top, and all are in a central symmetrical cylindrical shape along a central axis of the molten salt storage tank (10); the ceramsite soil layer (23) is connected with an inner wall of the calcium silicate board layer (12), and a lower surface of the ceramsite soil layer (23) is flush with a lower surface of the calcium silicate board layer (12); a width dimension of the fine sand cushion layer (21) and the sandy soil cushion layer (22) along a radial direction of the molten salt storage tank (10) is smaller than that of the ceramsite soil layer (23), the annular foundation bearing layer (24) is arranged between the calcium silicate board layer (12) and the fine sand cushion layer (21) and the sandy soil cushion layer (22), and an upper surface of the annular foundation bearing layer (24) is flush with an upper surface of the fine sand cushion layer (21) and an upper surface of the calcium silicate board layer (12); an outer edge of the molten salt storage tank (10) is located at a middle position of the annular foundation bearing layer (24).

3. The foundation heat insulation structure of the molten salt storage tank according to claim 2, characterized in that: the annular foundation bearing layer (24) comprises a steel fiber reinforced concrete layer (241) and a clay refractory brick layer (242), the steel fiber reinforced concrete layer (241) is arranged above the clay refractory brick layer (242), and a width dimension of the steel fiber reinforced concrete layer (241) along the radial direction of the molten salt storage tank (10) is greater than that of the clay refractory brick layer (242).

4. The foundation heat insulation structure of the molten salt storage tank according to claim 2, characterized in that: the ceramsite soil layer (23) is divided into a transverse multi-layer structure by a separation layer (231), and the separation layer (231) is a steel wire mesh or a ceramic fiber cloth. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. The foundation thermal insulation structure of a molten salt storage tank according to claim 1, wherein the calcium silicate board layer (12) is arranged in a three-layer structure, which comprises, from outside to inside, an outer calcium silicate board layer (121), an intermediate foam glass layer (122), and an inner calcium silicate board layer (123), the outer calcium silicate board layer (121) and the inner calcium silicate board layer (123) are curved calcium silicate boards, and the joint surfaces of each of the curved calcium silicate boards along the circumferential direction of the molten salt storage tank (10) are arranged in a mortise and tenon structure, and are connected to form an annular structure layer, and the intermediate foam glass layer (122) is arranged between the outer calcium silicate board layer (121) and the inner calcium silicate board layer (123). When the number of the calcium silicate board layers (12) is multiple, each of the multiple calcium silicate board layers (12) is arranged in the three-layer structure, and the joint seams of the outer calcium silicate board layers (121) of the upper and lower adjacent layers are circumferentially staggered with the joint seams of the inner calcium silicate board layers (123) of the upper and lower adjacent layers.

6. The foundation thermal insulation structure of a molten salt storage tank according to claim 5, wherein the thickness ratio of the outer calcium silicate board layer (121), the intermediate foam glass layer (122), and the inner calcium silicate board layer (123) along the radial direction of the molten salt storage tank (10) is 1:1:

2. The intermediate foam glass layer (122) is an annular structure layer formed by detachably connecting foam glass cotton boards, and the joint seams of the intermediate foam glass layer (122) are circumferentially staggered with the joint seams of the outer calcium silicate board layers (121) and the inner calcium silicate board layers (123) on both sides.

7. The foundation thermal insulation structure of a molten salt storage tank according to claim 1, wherein the foundation layer portion (3) comprises an annular concrete layer (31) and a fine gravel layer (32), the width of the annular concrete layer (31) is greater than the sum of the widths of the steel ring wall (11) and the calcium silicate board layer (12), and the steel ring wall (11) and the calcium silicate board layer (12) are arranged at the middle position of the annular concrete layer (31); The fine gravel layer (32) is arranged inside the annular concrete layer (31), and the upper and lower surfaces of the fine gravel layer (32) are flush with the upper and lower surfaces of the annular concrete layer (31); The upper surface of the fine gravel layer (32) is connected with the center thermal insulation layer portion (2).

8. The foundation thermal insulation structure of a molten salt storage tank according to claim 7, wherein a plurality of groups of ventilation pipes (321) are horizontally buried at the middle position of the fine gravel layer (32).

9. The foundation thermal insulation structure of a molten salt storage tank according to any one of claims 1-8, wherein the ring wall portion (1) further comprises an elastic connection layer (13), which is arranged between the steel ring wall (11) and the calcium silicate board layer (12).

10. The foundation thermal insulation structure of a molten salt storage tank according to any one of claims 1-8, wherein ​ ​ ​ ​ ​ The base heat preservation structure formed by the ring wall part (1), the center heat preservation layer part (2) and the base layer part (3) is partially buried below the ground, and the buried height is more than half of the height of the steel ring wall (11).

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