High-temperature storage tank composite foundation for high underground water level

Abstract

The invention belongs to the technical field of high-temperature energy storage, and discloses a high-temperature storage tank composite foundation for a high underground water level. A layer of inner ring beam outer side annular steel plate is laid on the outer side of an inner ring beam, a fireproof ceramic fiber plate is filled between the height range of the inner ring beam and an outer ring wall, and the outer ring wall is placed on a bearing raft; a sliding layer is arranged between the outer ring wall and the bearing raft, a heat preservation layer adheres to the outer side of the outer ring wall, the waterproof cofferdam and the bearing raft are integrally poured together, a waterproof heat preservation layer and a drainage ditch are arranged in the waterproof cofferdam, the drainage ditch is provided with a water collecting pit, and the two sides of the waterproof heat preservation layer are flashed and fixedly connected with the waterproof cofferdam and the bearing raft respectively. A high ring wall protrusion is arranged at the contact position of the bearing raft and the outer ring wall to serve as a sliding step, a reinforced concrete limiting tenon integrally poured with the sliding step is arranged on the inner side of the outer ring wall above the sliding step, four drainage pipes are evenly arranged on the periphery of the top face of the bearing raft, and a ventilation pipe is buried in the bearing raft. Meanwhile, the functions of water resistance, heat preservation, effective temperature stress release and the like are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-temperature energy storage, is mainly applied to high-temperature storage tank foundations, and specifically relates to a high-temperature storage tank composite foundation for a high groundwater level. Background Art

[0002] As a high-temperature heat transfer energy storage method, high-temperature energy storage has the advantages of high energy storage density, good stability, and long time. It is widely used in solar thermal power generation systems, power peak regulation, green electricity absorption, industrial waste heat recovery and other fields. At present, the working temperature of high-temperature energy storage media is about 550°C. With the increase of energy storage scale, the working temperature of energy storage media will gradually increase, even exceeding 1000°C, and the foundation of high-temperature storage tanks will be subject to huge temperature stress challenges. With the advancement of the construction of the "three reservoirs" of gas storage, carbon storage, and energy storage, in the field of energy storage, it is urgently needed to study the basic form that can adapt to high groundwater levels in high temperature environments and has better thermal insulation performance, so as to better serve the green and low-carbon development strategy of the oil industry.

[0003] At present, there is no supporting foundation for high-temperature storage tanks at high groundwater levels, resulting in a large amount of heat loss. Summary of the invention

[0004] The present invention designs a high-temperature storage tank composite foundation suitable for high groundwater levels. The composite foundation has the functions of waterproofing, heat preservation and effective release of temperature stress, which fills the gap in the application of high-temperature storage tank foundation in oil field ground engineering technology, and can provide technical support for power peak regulation, green electricity absorption, industrial waste heat recovery and other fields as well as high-temperature gas injection in heavy oil fields.

[0005] The above object of the present invention is achieved through the following technical solutions:

[0006] A composite foundation for high-temperature storage tanks with high groundwater levels, wherein a layer of annular steel plate is laid on the outer side of the inner ring beam, a refractory ceramic fiberboard is filled between the height range of the inner ring beam and the outer ring wall, the outer ring wall is placed on the load-bearing raft, a sliding layer is arranged between the outer ring wall and the load-bearing raft, an insulation layer is pasted on the outer side of the outer ring wall, and the waterproof cofferdam is an annular concrete structure, which is integrally cast together with the load-bearing raft to form an underground semi-enclosed structure to prevent groundwater from entering; a waterproof insulation layer and a drainage ditch are arranged inside the waterproof cofferdam, a sump is arranged in the drainage ditch, and flooding is done on both sides of the waterproof insulation layer, which are respectively connected to the waterproof cofferdam The weir and the load-bearing raft are fixedly connected, and a high ring wall protrusion is set at the contact position between the load-bearing raft and the outer ring wall as a sliding step to support the weight of the outer ring wall and allow the outer ring wall to slide thereon; a reinforced concrete limiting tenon cast integrally with the sliding step is set on the inner side of the outer ring wall above the sliding step, and a gap of 50 to 100 mm is set between the limiting tenon and the outer ring wall, and the flexible insulation material is filled inside, and 4 drainage pipes are evenly arranged around the top surface of the load-bearing raft and inclined outwardly at a slope of 2%; a valve is set on the drainage pipe, and a ventilation pipe is set on the top of the load-bearing raft, and the ventilation pipe is buried in the load-bearing raft.

[0007] Furthermore, the inner filling materials of the inner ring beam are respectively: expanded clay, aluminum silicate fiber blanket layer, and medium-coarse sand cushion layer from the top surface of the load-bearing raft slab from bottom to top; the expanded clay is high-strength shale expanded clay with a thickness of 1500-2000mm; the aluminum silicate fiber blanket layer is laid in two layers, each layer has a virtual thickness of 30-50mm, and the medium-coarse sand cushion layer is laid on the aluminum silicate fiber blanket layer, with a thickness of 100mm at the thinnest part, and a slope of 1.5% from the center to the surrounding area, and a compaction coefficient of not less than 0.96.

[0008] Furthermore, the inner ring beam is 400 mm wide and 400-600 mm high, and is made of heat-resistant concrete material or refractory bricks.

[0009] Furthermore, the material of the outer annular steel plate of the inner ring beam is S34779 stainless steel.

[0010] Furthermore, the refractory ceramic fiberboard is made of flexible thermal insulation material.

[0011] Furthermore, the slip layer is a steel plate with a thickness of 4 to 6 mm.

[0012] Furthermore, the thermal insulation layer is made of ceramic fiberboard.

[0013] Furthermore, the waterproof and thermal insulation layer structure consists of, from bottom to top, thermal insulation layer + lightweight aggregate slope layer + 20 mm thick cement mortar leveling layer + waterproof membrane + 10 mm mortar isolation layer + C20 fine stone concrete protective layer, with a steel mesh inside the protective layer.

[0014] Furthermore, the drainage ditch is 200 mm wide and 80 mm deep at the starting point. It is arranged in a circle along the bottom of the waterproof cofferdam and slopes toward the sump at 2%.

[0015] Furthermore, the spacing between the ventilation pipes is 0.5m to 1m, and the diameter of the ventilation pipes is determined by calculation based on natural convection ventilation or forced ventilation.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. The tank foundation adopts the structure of inner ring beam + outer ring wall + load-bearing raft. The inner ring beam, outer ring wall and load-bearing raft are independent of each other and have no influence on each other due to temperature deformation. They can deform freely to release temperature stress.

[0018] Second, a layer of steel plate is laid on the outside of the inner ring beam, so that the concrete and steel plate bear forces in different directions respectively. The overall force is simple, clear and reasonable, giving full play to the advantages of different materials in terms of different force properties;

[0019] 3. An insulation layer is set on the outside of the outer ring wall, which can effectively prevent the heat loss in the storage tank, reduce the impact of the ambient temperature on the outer ring wall, reduce the temperature difference of the outer ring wall, play a role in thermal insulation and reduce temperature stress;

[0020] 4. The tank foundation has waterproof and drainage functions, which can meet the use needs of high water level areas. It also has the monitoring and storage functions when molten salt leaks in the early stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 This is a cross-sectional view of the foundation of the composite high-temperature storage tank with a high groundwater level of the present invention;

[0023] Figure 2 It is the basic plan view of the composite high temperature storage tank with high groundwater level of the present invention;

[0024] Figure 3 This is the structural diagram of the sliding layer of the outer ring wall.

[0025] Among them: 1. Inner ring beam; 2. Circumferential steel plate outside the inner ring beam; 3. Outer ring wall; 4. Waterproof cofferdam; 5. Load-bearing raft; 6. Refractory ceramic fiberboard; 7. Expanded clay; 8. Aluminum silicate fiber blanket layer; 9. Medium-coarse sand cushion layer; 10. Ventilation pipe; 11. Sliding layer; 12. Drain pipe; 13. Waterproof and thermal insulation layer; 14. Drainage ditch; 15. Thermal insulation layer; 16. Sump; 17. Sliding step; 18 Limiting tenon. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail in conjunction with the following specific embodiments, but it should not be understood as limiting the scope of implementation of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, etc. used can be obtained from commercial channels.

[0027] Example 1

[0028] The present invention is a composite foundation for a high-temperature molten salt storage tank, which can provide technical support for power peak and frequency regulation, green electricity absorption, industrial waste heat recovery, and high-temperature gas injection energy storage in heavy oil and gas fields. The invention mainly consists of the following parts: inner ring beam 1, outer annular steel plate 2 of the inner ring beam, outer ring wall 3, waterproof cofferdam 4, load-bearing raft 5, refractory ceramic fiber board 6, ceramsite 7, aluminum silicate fiber blanket layer 8, medium-coarse sand cushion layer 9, ventilation pipe 10, sliding steel plate 11, drainage pipe 12, waterproof insulation layer 13, drainage ditch 14, insulation layer 15, sump 16, sliding step 17, and limiting tenon 18.

[0029] Specifically, the present invention provides a composite foundation for a high-temperature storage tank which is suitable for high water levels, has the features of waterproofing, heat preservation and effective release of temperature stress. The technical solution of the foundation is as follows: inner ring beam 1 + outer ring wall 3 + waterproof cofferdam 4 + drainage measures + thermal insulation materials + load-bearing raft 5.

[0030] The inner ring beam 1 is 400mm wide and 400-600mm high and is made of heat-resistant concrete. It is located on the lower side of the tank wall and is mainly used to support the deadweight of the tank. A layer of S34779 stainless steel outer annular steel plate 2 is laid on the outer side of the inner ring beam 1. The inner ring beam outer annular steel plate 2 bears the horizontal lateral pressure generated by the weight of the medium in the tank. In this way, the inner ring beam 1 and the inner ring beam outer annular steel plate 2 form a force system, which bears forces in different directions respectively. The force is simple, clear and reasonable, and can give full play to the compressive properties of concrete and the tensile properties of steel. The heat-resistant concrete material of the inner ring beam 1 can also be replaced by refractory bricks.

[0031] Flexible thermal insulation material refractory ceramic fiberboard 6 is filled between the height range of the inner ring beam 1 and the outer ring wall 3. This can release the lateral pressure generated by the expansion of the inner ring beam 1 due to the increase in temperature, and can play a role in thermal insulation. It can also effectively reduce the temperature and lateral pressure acting on the outer ring wall 3, which is beneficial to reducing the thickness of the outer ring wall 3 and the amount of steel bars used.

[0032] The outer ring wall 3 is placed on the load-bearing raft 5, and a sliding layer 11 is arranged between the outer ring wall 3 and the load-bearing raft 5. The sliding layer 11 is a steel plate with a thickness of 4 to 6 mm. The width of the steel plate is the thickness of the outer ring wall plus the shrinkage and expansion deformation. The outer ring wall 3 can slide when the temperature rises and falls to produce expansion and contraction, and freely release the overall temperature stress; the outer side of the outer ring wall 3 is pasted with an insulation layer 15 made of ceramic fiber board. The thickness of the ceramic fiber board (or other insulation materials) is determined according to the convection heat transfer calculation. The insulation layer 15 can reduce the influence of the ambient temperature and effectively reduce the temperature difference between the inside and outside of the outer ring wall 3 (in cold areas, the low temperature in winter has a greater impact on the temperature difference of the outer ring wall 3), which is conducive to reducing the temperature difference stress of the outer ring wall;

[0033] The waterproof cofferdam 4 is an annular concrete structure, which is integrally cast with the load-bearing raft 5 to form an underground semi-enclosed structure to prevent groundwater from entering; a waterproof insulation layer 13 and a drainage ditch 14 are arranged inside the waterproof cofferdam 4, and the waterproof insulation layer 13 is composed of the following structures from bottom to top: insulation layer + light aggregate slope layer + 20mm thick cement mortar leveling layer + waterproof membrane + 10mm mortar isolation layer + C20 fine stone concrete protective layer (with a steel mesh in the protective layer), and the waterproof insulation layer 13 is flooded on both sides, and is fixedly connected to the waterproof cofferdam 4 and the load-bearing raft 5 respectively; the drainage ditch 14 is 200mm wide and 80mm deep at the starting point, and is arranged in a circle along the bottom of the waterproof cofferdam 4, and is sloped toward the sump 16 at 2%; the water level in the waterproof cofferdam 4 is interlocked with the water pump, and once there is water accumulation, it is pumped away in time with the pump and discharged to the designated area of ​​the site. The waterproof cofferdam 4, the waterproof insulation layer 13 and the drainage ditch 14 constitute an effective drainage system, which can prevent groundwater from entering and effectively discharge rainwater in the waterproof cofferdam 4. At the same time, it has the monitoring and storage functions when the molten salt leaks in the early stage, so as to buy time for timely detection of problems and taking measures;

[0034] The load-bearing raft 5 is located at the bottom of the entire structure, mainly bearing the weight of the upper storage tank and the internal medium, and can effectively adjust the uneven settlement of the molten salt in the storage tank under the periodic cyclic load, and can also serve as a pile foundation cap on a weak foundation; a 200-300mm high ring wall protrusion sliding step 17 is set at the contact position between the load-bearing raft 5 and the outer ring wall 3, and the width can be the same as the width of the steel plate of the sliding layer 11 at the bottom of the outer ring wall, which is used to support the weight of the outer ring wall 3 and allow the outer ring wall 3 to slide thereon; a reinforced concrete limiting tenon 18 integrally cast with the sliding step 17 is set on the inner side of the outer ring wall 3 above the sliding step 17, and a gap of 50-100mm is set between the limiting tenon 18 and the outer ring wall 3, and a flexible thermal insulation material is filled inside. The limiting tenon 18 mainly plays a limiting role, so that the outer ring wall 3 can slide and be limited within a limited sliding range; 4 positions are evenly arranged around the top surface of the load-bearing raft 5 A drainage pipe 12 is provided, and is inclined outward at a slope of 2%; a valve is arranged on the drainage pipe 12 to discharge rainwater accumulated during construction and rainwater that may penetrate along the tank wall during use; the valve on the drainage pipe 12 should be in a closed state under normal working conditions and is opened only in the drainage state to prevent the accumulated water in the cofferdam 4 from entering the expanded clay 7 through the drainage pipe and affecting the thermal insulation performance of the expanded clay; a ventilation pipe 10 is arranged on the top of the load-bearing raft 5, and the ventilation pipe 10 is buried in the load-bearing raft 5, the spacing between the ventilation pipes 10 is 0.5m to 1m, and the diameter of the ventilation pipe is determined by calculation based on natural convection ventilation or forced ventilation.

[0035] The filling materials in the inner ring beam 1 are respectively: ceramsite 7, aluminum silicate fiber blanket layer 8, and medium-coarse sand cushion layer 9 from the top surface of the load-bearing raft 5 from bottom to top; the ceramsite 7 is high-strength shale ceramsite with a thickness of 1500-2000mm, which must be compacted in layers and is the main thermal insulation material; the aluminum silicate fiber blanket layer 8 is laid in two layers, and each layer has a virtual thickness of 30-50mm, which is mainly used to prevent the medium-coarse sand cushion layer 9 from penetrating into the ceramsite 7 during the compaction process; the medium-coarse sand cushion layer 9 is laid on the aluminum silicate fiber blanket layer 8, with a thickness of 100mm at the thinnest part, and a slope of 1.5% from the center to the surroundings, and a compaction coefficient of not less than 0.96; the main function of the medium-coarse sand cushion layer 9 is to fully contact with the bottom plate of the tank to transmit pressure.

[0036] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A composite foundation for a high-temperature storage tank at a high groundwater level, characterized in that: A layer of annular steel plate (2) is laid on the outer side of the inner ring beam (1), a refractory ceramic fiberboard (6) is filled between the height range of the inner ring beam (1) and the outer ring wall (3), the outer ring wall (3) is placed on the load-bearing raft (5), a sliding layer (11) is arranged between the outer ring wall (3) and the load-bearing raft (5), an insulation layer (15) is pasted on the outer side of the outer ring wall (3), the waterproof cofferdam (4) is an annular concrete structure, and is integrally cast together with the load-bearing raft (5) to form an underground semi-enclosed structure to prevent groundwater from entering; a waterproof insulation layer (13) and a drainage ditch (14) are arranged inside the waterproof cofferdam (4), a sump (16) is arranged in the drainage ditch (14), and flooding is done on both sides of the waterproof insulation layer (13), respectively connected to the waterproof cofferdam (4) and the load-bearing raft (5) The invention relates to a fixed connection, wherein a high ring wall protrusion is arranged at the contact position between the load-bearing raft plate (5) and the outer ring wall (3) as a sliding step (17), which is used to support the weight of the outer ring wall (3) and allow the outer ring wall (3) to slide thereon; a reinforced concrete limiting tenon (18) integrally cast with the sliding step (17) is arranged on the inner side of the outer ring wall (3) above the sliding step (17); a gap of 50 to 100 mm is arranged between the limiting tenon (18) and the outer ring wall (3), and a flexible thermal insulation material is filled inside; drainage pipes (12) are evenly arranged (4) around the top surface of the load-bearing raft plate (5) and are inclined outwardly at a slope of 2%; a valve is arranged on the drainage pipe (12); a ventilation pipe (10) is arranged on the top of the load-bearing raft plate (5), and the ventilation pipe (10) is buried in the load-bearing raft plate (5).

2. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The inner filling materials of the inner ring beam (1) are respectively: ceramsite (7), aluminum silicate fiber blanket layer (8), and medium-coarse sand cushion layer (9) from the top surface of the load-bearing raft (5) from bottom to top; the ceramsite (7) is high-strength shale ceramsite with a thickness of 1500-2000 mm; the aluminum silicate fiber blanket layer (8) is laid in two layers, each layer has a virtual thickness of 30-50 mm, and the medium-coarse sand cushion layer (9) is laid on the aluminum silicate fiber blanket layer (8), with a thickness of 100 mm at the thinnest part, and a slope of 1.5% from the center to the surroundings, and a compaction coefficient of not less than 0.

96.

3. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The inner ring beam (1) is 400 mm wide and 400-600 mm high, and is made of heat-resistant concrete material or refractory bricks.

4. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The material of the outer annular steel plate (2) of the inner ring beam is S34779 stainless steel.

5. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The refractory ceramic fiberboard (6) is made of a flexible thermal insulation material.

6. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The slip layer (11) is a steel plate with a thickness of 4 to 6 mm.

7. The composite foundation for high temperature storage tanks at high groundwater level according to claim 1, characterized in that: The thermal insulation layer (15) is made of ceramic fiberboard.

8. The composite foundation for high temperature storage tanks at high groundwater level according to claim 1, characterized in that: The waterproof and thermal insulation layer (13) is composed of the following structures from bottom to top: thermal insulation layer + light aggregate slope layer + 20 mm thick cement mortar leveling layer + waterproof coiled material + 10 mm mortar isolation layer + C20 fine stone concrete protective layer, wherein a steel mesh is arranged inside the protective layer.

9. The composite foundation for high-temperature storage tanks at high groundwater levels according to claim 1, characterized in that: The drainage ditch (14) is 200 mm wide and 80 mm deep at the starting point. It is arranged in a circle along the bottom of the waterproof cofferdam (4) and slopes toward the sump (16) at a rate of 2%.

10. The composite foundation for high temperature storage tanks at high groundwater level according to claim 1, characterized in that: The spacing between the ventilation pipes (10) is 0.5 m to 1 m, and the diameter of the ventilation pipes is determined by calculation based on natural convection ventilation or forced ventilation.

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