Thermal insulation foundation of fused salt storage tank

Abstract

The utility model discloses a fused salt storage tank heat preservation foundation which comprises a bottom plate, an inner ring wall and an outer ring wall, a ventilation pipe is arranged in the bottom plate, the inner ring wall and the outer ring wall are both arranged on the bottom plate, an inner core structure is arranged on the inner side of the inner ring wall, the inner core structure is provided with a buffer layer and a heat preservation layer from top to bottom, and an air heat insulation layer is arranged between the inner ring wall and the outer ring wall. A water collecting well is arranged between the inner ring wall and the outer ring wall, and a liquid level monitoring device and a water suction pump are arranged in the water collecting well. The high-temperature medium storage tank can be suitable for underground water or rainwater-rich areas, multi-layer water prevention, intelligent water level monitoring and drainage can be achieved, performance and strength failures of heat preservation materials are avoided, and safe operation of the high-temperature medium storage tank is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of molten salt energy storage, and specifically relates to a thermal insulation foundation of a molten salt storage tank. Background Art

[0002] With the rapid development of new energy power generation such as wind power and solar energy in my country, energy storage measures need to be taken to ensure the relative stability of new energy power generation. At present, molten salt has good heat storage and heat transfer performance as a heat storage medium, and high-temperature medium storage tanks such as molten salt are becoming more and more large-scale. Due to the high temperature of the heat storage medium, the insulation and strength performance of the tank foundation is one of the key factors affecting the efficiency and safety of the tank, and is the key to ensuring the stable operation of the high-temperature medium storage tank.

[0003] Usually, the temperature of the molten salt stored in the molten salt storage tank is between 200 and 600°C, and the tank bottom needs to be made of materials that have both support strength and thermal insulation to form an insulation foundation. The insulation foundation not only provides structural support for the storage tank, but also forms an insulation layer at the bottom of the tank to prevent the heat loss of the high-temperature molten salt. At the same time, insulation is performed to prevent the bottom soil or concrete bottom plate from overheating and affecting the foundation bearing capacity, and to prevent excessive uneven settlement of the foundation from causing stress concentration in the tank body and leaks. The insulation foundation needs to solve problems such as thermal insulation, support strength, uneven settlement, expansion stress, waterproofing, and leak repair.

[0004] Conventional insulation foundation is a single-layer ring wall structure such as inner ring wall or outer ring wall. The ring wall can be made of reinforced concrete, steel plate or refractory brick. Insulation materials such as ceramsite, vitrified brick or calcium silicate board are filled in the ring wall and laid in layers. The ring wall provides lateral support for the insulation material filled inside, restricts the displacement of the internal insulation material and the bottom of the tank, and prevents groundwater or rainwater from entering the insulation layer from the side, thereby avoiding the insulation material from being damp and failing. Figure 1 As shown. In this single-layer ring wall structure, the ring wall itself is affected by temperature and expands and displaces, and is also affected by the thrust generated by the expansion of the internal filler. Whether it is concrete, steel plate or masonry ring wall, the ring wall structure is very easy to crack under the influence of its own temperature difference and lateral thrust, and cannot effectively prevent groundwater or rainwater from infiltrating the insulation material, causing the insulation performance and foundation support strength to fail, and safety accidents are prone to occur. Therefore, this conventional insulation foundation structure is not suitable for areas with abundant groundwater or rainwater. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a molten salt storage tank insulation foundation, which can be suitable for areas with abundant groundwater or rainwater, can achieve multi-layer waterproofing, intelligent water level monitoring and drainage, avoid performance and strength failure of insulation materials, and ensure the safe operation of high-temperature medium storage tanks.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A molten salt storage tank insulation foundation comprises a bottom plate, an inner ring wall and an outer ring wall, wherein a ventilation pipe is arranged in the bottom plate, the inner ring wall and the outer ring wall are both arranged on the bottom plate, an inner core structure is arranged on the inner side of the inner ring wall, a buffer layer and an insulation layer are arranged on the inner core structure from top to bottom, an air insulation layer is arranged between the inner ring wall and the outer ring wall, and a water collection well is arranged between the inner ring wall and the outer ring wall, wherein a liquid level monitoring device and a water pump are arranged in the water collection well.

[0008] In one embodiment of the utility model, the base plate is provided with a support platform, which has a conical top and a horizontal ring portion surrounding the conical top, the conical top is supported by the inner core structure, and the conical top is provided with a drainage slope, and the horizontal ring portion is supported by the inner ring wall.

[0009] In one embodiment of the present invention, the inner core structure is further provided with a hydrophobic layer, which is spread on the bottom plate and located under the thermal insulation layer.

[0010] In one embodiment of the utility model, the inner core structure is also provided with a rigid layer and an anti-radiation layer. The anti-radiation layer is arranged on the upper layer of the thermal insulation layer and located below the rigid layer. The rigid layer is arranged on the lower layer of the buffer layer and located on the upper layer of the anti-radiation layer.

[0011] In an embodiment of the present invention, the inner ring wall is a steel plate ring wall.

[0012] In an embodiment of the present invention, the air insulation layer is partially filled with thermal insulation material.

[0013] In one embodiment of the utility model, the inner core structure is further provided with a ring beam for supporting the storage tank, and the ring beam is embedded in the top of the thermal insulation layer.

[0014] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0015] The utility model changes the side structure layout of the insulation foundation and adopts a multi-layer side ring wall combination consisting of an outer ring wall, an air insulation layer and an inner ring wall, so as to meet the side force requirements and achieve multiple waterproofing. In addition, the utility model also arranges a liquid level monitoring device in the water collection well between the outer ring wall and the inner ring wall to automatically monitor the water level, and uses a water pump to pump out water in time, which can ensure that in areas with abundant groundwater, the insulation foundation of the sunken storage tank is not affected by groundwater and can operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of a thermal insulation foundation in the prior art;

[0018] Figure 2 It is a cross-sectional view of the thermal insulation foundation in the utility model;

[0019] Figure 3 It is a schematic diagram of the cone top, horizontal ring part and drainage slope of the bottom plate of the utility model.

[0020] Icons: 1-ring beam, 2-inner ring wall, 3-air insulation layer, 4-outer ring wall, 5-water collection well, 6-rigid layer, 7-insulation layer, 8-buffer layer, 9-anti-radiation layer, 10-hydrophobic layer, 11-bottom plate, 111-cone top, 1111-drainage slope, 112-horizontal ring, 12-ventilation pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present utility model, it should be noted that if the terms "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "configure", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example

[0027] Please refer to Figure 2-3 , Figure 2 The cross-sectional view of the thermal insulation foundation of this embodiment is as follows. Since the thermal insulation foundation of this embodiment is a cylindrical structure of a rotating body, Figure 2 The cross-sectional view only records the left side structure of the cross-sectional view of the insulation foundation, and omits the symmetrical right side structure. The present embodiment provides a molten salt storage tank insulation foundation, which is a sunken insulation foundation, comprising a bottom plate 11, an inner ring wall 2 and an outer ring wall 4. The bottom plate 11 is of reinforced concrete structure. Several ventilation pipes 12 are embedded in the bottom plate 11. When in use, ventilation can be conducted into the ventilation pipes 12 to reduce the temperature of the bottom plate 11. The outer ring wall 4 is of reinforced concrete structure, and the outer ring wall 4 is cast after the bottom plate 11 is cast. The outer ring wall 4 can also be made of steel plate. The outer ring wall 4 of the present embodiment is of reinforced concrete structure. The inner annular wall 2 is made of steel plate and is movably connected to the bottom plate 11. In this embodiment, the inner annular wall 2 is directly placed on the bottom plate 11. When the inner annular wall 2 is under the dual effects of its own temperature difference and the lateral thrust generated by the expansion of the inner core structure inside the inner annular wall 2, the inner annular wall 2 with a steel plate structure will not produce cracks. The inner annular wall 2 and the bottom plate 11 are movably connected to avoid cracking at the bottom of the inner annular wall 2.

[0028] It should be noted that during the use of the molten salt storage tank, the high temperature will cause a large degree of expansion and deformation, and the inner ring wall 2 of the steel plate structure will also cause a large degree of expansion and deformation due to the high temperature. Placing the inner ring wall 2 directly on the bottom plate 11 is conducive to the free expansion and deformation of the inner ring wall 2. If the inner ring wall 2 is fixed to the bottom plate 11, it may cause the inner ring wall 2 to crack.

[0029] In this embodiment, there is a spacing between the outer annular wall 4 and the inner annular wall 2, and there is an air insulation layer 3 between the outer annular wall 4 and the inner annular wall 2, which can achieve the effect of efficient heat preservation and avoid heat loss on the side of the foundation. A water collection well 5 is dug on the bottom plate 11 between the inner annular wall 2 and the outer annular wall 4. The water collection well 5 is in a ring shape, and the part of the bottom plate 11 surrounded by the water collection well 5 is a base, which includes a cone top 111 and a horizontal ring part 112 surrounding the cone top. The top surface of the horizontal ring part 112 is a plane, and the inner annular wall 2 is placed on the plane of the horizontal ring part 112. The cone top 111 is used to support the inner core structure, and the inclined surface of the cone top 111 is a drainage slope 1111. When water enters the inner core structure, the water It flows along the drainage slope 1111 to the water collection well 5, and flows into the water collection well 5 through the gap between the inner ring wall 2 and the horizontal ring portion 112. A liquid level monitoring device and a water pump are also provided in the water collection well 5. A controller, a display and other supporting equipment for automatic monitoring and automatic drainage are also provided outside the insulation foundation. If the water level in the water collection well 5 rises to trigger the liquid level monitoring device, the controller controls the water pump to pump water out of the well in time, ensuring that the insulation foundation can operate reliably in areas with abundant groundwater and rainwater.

[0030] In this embodiment, the inner core structure in the inner ring wall 2 includes, from top to bottom, a buffer layer 8, a rigid layer 6, an anti-radiation layer 9, an insulation layer 7 and a hydrophobic layer 10. The hydrophobic layer 10 is laid on the bottom plate 11, and the insulation layer 7 is laid in layers using insulation materials such as ceramsite, ceramic sand, calcium silicate board, and vitrified bricks. The hydrophobic layer 10 is laid at the bottom of the insulation layer 7. The hydrophobic layer 10 can be made of crushed stone or other porous materials. Even if water penetrates into the inner core structure, the infiltrated water can flow into the water collection well 5 through the hydrophobic layer 10 and the drainage slope, and the water level is monitored by the liquid level monitoring device and discharged by the pump, so that the insulation foundation can operate reliably in areas with abundant groundwater and rainwater. The anti-radiation layer 9 is laid with a flexible insulation material with aluminum foil to reflect the thermal radiation of the molten salt and reduce the heat loss of the stored molten salt. The bottom of the tank is paved with refractory bricks or steel plates as a rigid layer 6 to form a foundation to support the tank and isolate the molten salt that may leak from the bottom of the tank from entering the insulation layer 7, so as to prevent the molten salt leakage from damaging the insulation performance of the insulation foundation. A sand layer is laid on the rigid layer 6 as a buffer layer 8 to enhance the fit between the tank and the insulation foundation and ensure that the thermal expansion of the tank body is not constrained.

[0031] It should be noted that in the air insulation layer 3 of the embodiment, flexible insulation materials such as aluminum silicate, glass wool, rock wool, etc. can be partially filled. Those skilled in the art can also set a cover plate on the top of the air insulation layer 3 to form a closed air insulation space and prevent the leakage of molten salt from entering the air insulation space, because the leaked molten salt is discharged to the side of the foundation through the top cover plate. After the insulation foundation of this embodiment is insulated by the air insulation layer 3, the external environment temperature can be reduced to below 90°C, which can prevent the concrete outer ring wall 4 from expanding and cracking, and at the same time form a good waterproof side wall.

[0032] In this embodiment, a ring beam 1 for supporting the storage tank is also provided on the top of the inner core structure and is embedded in the top of the insulation layer 7. The ring beam 1 can be made of heat-resistant concrete to increase the rigidity of the bottom of the tank wall and reduce uneven settlement.

[0033] The utility model changes the side structure layout of the insulation foundation and adopts a multi-layer side ring wall combination consisting of an outer ring wall 4, an air insulation layer 3, and an inner ring wall 2, so as to meet the side force requirements and multiple waterproofing. In this embodiment, a drainage slope is arranged on the rigid bottom plate 11, and a hydrophobic layer 10 is arranged, so that the water entering the insulation layer 7 can be discharged to between the outer ring wall 4 and the inner ring wall 2 in time. In addition, the utility model also arranges a liquid level monitoring device in the water collection well 5 between the outer ring wall 4 and the inner ring wall 2 to automatically monitor the water level, and uses a water pump to pump out water in time, which can ensure that in areas with abundant groundwater, the insulation foundation of the sunken storage tank is not affected by groundwater and can operate stably for a long time.

[0034] Take the insulation foundation of a high-temperature molten salt storage tank as an example. The tank has a diameter of 30m, a medium temperature of 560℃, and a groundwater of -1m. First, excavate the foundation to a depth of about -3m, cut the pile head, pour the cushion layer, and apply the cushion layer anti-corrosion and waterproof paint. Tie the bottom plate 11 steel bars and pre-embed the bottom ventilation pipe 12 at the same time. The ventilation pipe 12 uses a pipe with a diameter of 180mm and a wall thickness of 4mm. Support the bottom formwork, and after the steel bars and pre-embedded are accepted, the concrete thickness of the bottom plate 11 is 600mm. C30 heat-resistant concrete is used. The bottom plate 11 needs to be set with a slope for drainage of the hydrophobic layer 10. After the bottom plate 11 reaches the strength, weld the steel inner ring wall 2. The material of the inner ring wall 2 is Q235B and the thickness is 40mm. Lay the hydrophobic layer of the bottom plate 11 100mm. Lay the insulation material above the bottom plate 11 layer by layer with a thickness of 600mm, and press the acceptance test. Set up the template of the ring beam 1 at the bottom of the tank wall and split it, position the embedded parts, pour the concrete of the ring beam 1, remove the split template after reaching the strength, and fill it with high temperature resistant elastic material. Lay the anti-radiation layer, rigid layer 120mm, and sand layer 150mm layer by layer. Set up the outer ring wall 4 steel bars and templates, and pour the outer ring wall concrete after acceptance. Finally, weld the outer layer of the ventilation pipe 12 to the ground, and then backfill the foundation and compact it layer by layer.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A molten salt storage tank insulation foundation, comprising a bottom plate, an inner ring wall and an outer ring wall, wherein a ventilation pipe is arranged in the bottom plate, the inner ring wall and the outer ring wall are both arranged on the bottom plate, an inner core structure is arranged on the inner side of the inner ring wall, and the inner core structure is provided with a buffer layer and an insulation layer from top to bottom, characterized in that: An air insulation layer is arranged between the inner annular wall and the outer annular wall, and a water collecting well is dug on the bottom plate between the inner annular wall and the outer annular wall. A liquid level monitoring device and a water pump are arranged in the water collecting well.

2. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The bottom plate is provided with a support platform, which is provided with a cone top and a horizontal ring portion surrounding the cone top. The cone top is supported by the inner core structure, and the cone top is provided with a drainage slope. The horizontal ring portion is supported by the inner ring wall.

3. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The inner core structure is also provided with a hydrophobic layer, which is spread on the bottom plate and located under the thermal insulation layer.

4. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The inner core structure is also provided with a rigid layer and an anti-radiation layer. The anti-radiation layer is arranged on the upper layer of the thermal insulation layer and located below the rigid layer. The rigid layer is arranged on the lower layer of the buffer layer and located on the upper layer of the anti-radiation layer.

5. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The inner ring wall is a steel plate ring wall.

6. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The air insulation layer is partially filled with heat preservation material.

7. The molten salt storage tank insulation foundation according to claim 1, characterized in that: The inner core structure is also provided with a ring beam for supporting the storage tank, and the ring beam is embedded in the top of the thermal insulation layer.

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