WO2023225976A1

WO2023225976A1 - Foundation structure for high-temperature storage tank

Info

Publication number: WO2023225976A1
Application number: PCT/CN2022/095431
Authority: WO
Inventors: 司继松; 代春雷; 赵国明; 魏治; 张学博; 赵国峰
Original assignee: 蓝星(北京)化工机械有限公司
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2023-11-30

Abstract

A foundation structure for a high-temperature storage tank, comprising a raft foundation provided in the horizontal direction. A graded sandstone layer is laid in the middle of the top of the raft foundation in the horizontal direction; a ventilation pipe burying layer is laid on the top of the graded sandstone layer in the horizontal direction; ventilation pipes used for heat exchange and cooling are provided in the ventilation pipe burying layer in the horizontal direction; a composite heat preservation layer is laid on the top of the ventilation pipe burying layer in the horizontal direction; a sand cushion is laid on the top of the composite heat preservation layer in the horizontal direction; and a net-shaped inner ring wall leakage detection groove is formed between the sand cushion and the composite heat preservation layer in the horizontal direction. The objective is to provide the foundation structure for the high-temperature storage tank which is convenient for analogue simulation design by means of a computer, can truly reproduce the stress condition of a storage tank foundation, enables a bottom plate of the high-temperature storage tank to be uniformly stressed, ensures the safety of the foundation, releases thermal stress, so as to ensure the operation safety of the storage tank, and can find the molten salt leakage phenomenon in time to recover the leaked molten salt and avoid pollution to the environment.

Description

Infrastructure used in high-temperature storage tanks

Technical field

The present invention relates to the field of solar thermal power generation, and specifically relates to a basic structure applied to high-temperature storage tanks.

Background technique

Solar energy is a clean, renewable energy source. One of the challenges in harnessing renewable energy, especially solar energy, is dealing with the intermittency of energy supplies caused by weather, diurnal sunlight fluctuations and seasonal changes. One way to effectively manage the variability of solar resources is to add them to The thermal energy storage device stores the changing energy when there is residual power, and then releases the stored energy when the power generated by the solar energy is insufficient or no power is generated, thereby realizing the need for continuous power supply. In order to avoid low energy flow density and being restricted by factors such as day and night, seasons, clouds and rain, a technology has been developed to directly store solar energy in the form of heat, which is called solar thermal storage technology.

In solar thermal storage technology, high-temperature thermal storage systems for storing solar energy have been a hot topic of research in recent years. In high-temperature thermal storage systems, the design of the basic structure of the high-temperature storage tank of the core equipment has always been a difficulty in this field. How to ensure the stability of the operation of high-temperature storage tanks is also a top priority in the design of this infrastructure. Currently, the foundations of high-temperature storage tanks are mostly made of ceramsite insulation materials, but ceramsite insulation materials are granular and difficult to compact. , its nature is a mechanical problem of discontinuous media. The stress analysis and calculation of discontinuous media is relatively complex, and it is difficult to truly reproduce its stress and load conditions in simulations and simulations. Therefore, the existing thermal insulation materials are easily made of ceramsite insulation materials. The basic structure is prone to local collapse and other hidden dangers that endanger the safety of the storage tank.

In addition, the molten salt storage tank still leaks, causing the molten salt storage tank to be unable to be used normally and causing serious pollution to the environment. How to quickly detect molten salt leakage is currently a key issue in this field.

Contents of the invention

The purpose of the present invention is to provide a convenient simulation design through a computer, which can truly reproduce the stress condition of the storage tank foundation, make the stress on the bottom plate of the high-temperature storage tank uniform, ensure the safety of the foundation, and release thermal stress, thereby ensuring the safe operation of the storage tank. , and can detect molten salt leakage in time, recycle the leaked molten salt, and avoid environmental pollution when used in the infrastructure of high-temperature storage tanks.

The basic structure of the present invention applied to high-temperature storage tanks includes a raft foundation arranged along the horizontal direction. The raft foundation is made of reinforced concrete. A graded sand and gravel layer is laid in the middle of the top of the raft foundation along the horizontal direction. There is a steel mesh in the sand and gravel layer. The compaction coefficient of the graded sand and gravel layer is above 0.98. The top of the graded sand and gravel layer is laid with a ventilation pipe buried layer in the horizontal direction. There is a ventilation pipe buried layer in the horizontal direction in the horizontal direction. A ventilation pipe for heat exchange and cooling. One end of the ventilation pipe is connected to the air outlet or air inlet of the cooling fan. There are multiple temperature sensors on the ventilation pipe;

The top of the buried layer of the ventilation pipe is laid with a composite insulation layer in the horizontal direction, and the top of the composite insulation layer is laid with a sand cushion in the horizontal direction. The sand used for the sand cushion is high-temperature resistant quartz sand. The sand cushion is There is a mesh-shaped inner ring wall leakage detection groove along the horizontal direction between the composite insulation layer and the inner ring wall leakage detection groove. There are multiple temperature sensors in the inner ring wall leakage detection groove;

The outer wall of the sand cushion and the composite insulation layer is surrounded by an inner ring wall in the vertical direction. The bottom end of the inner ring wall is close to the top of the ventilation pipe buried layer. The outer wall of the inner ring wall is located along the vertical direction. There is a composite insulation layer between the surrounding walls in the straight direction. The bottom end of the composite insulation layer between the surrounding walls is close to the top of the buried layer of the ventilation pipe. The top of the composite insulation layer between the surrounding walls is provided with an annular outer ring wall leakage in the horizontal direction. Detection tank, the outer ring wall leakage detection tank is equipped with multiple temperature sensors;

There is an outer ring wall surrounding the outer wall of the composite insulation layer, the ventilation pipe buried layer and the graded sand and gravel layer between the ring walls in the vertical direction. The bottom end of the outer ring wall is in contact with the top of the raft foundation. The inner wall of the ring wall is in contact with the outer wall of the composite insulation layer, the ventilation pipe buried layer and the graded sand and gravel layer between the ring walls. The outer ring wall is made of reinforced refractory concrete or steel plates;

The bottom of the inner ring wall leakage detection tank and the bottom of the outer ring wall leakage detection tank are respectively provided with liquid outlets. The liquid outlet at the bottom of the inner ring wall leakage detection tank and the liquid outlet at the bottom of the outer ring wall leakage detection tank are respectively It is connected to the molten salt leakage collection tank through the drainage pipeline, and the molten salt leakage collection tank is arranged outside the outer ring wall;

Preferably, the cross section of the inner ring wall leakage detection groove is rectangular, the cross section of the outer ring wall leakage detection groove is rectangular, and the cross sections of the inner ring wall and the outer ring wall along the horizontal direction are circular.

Preferably, the thickness of the bottom end and the raft foundation in the vertical direction is 600mm-2000mm, the thickness of the graded sand and gravel layer in the vertical direction is 1000mm-3000mm, and the thickness of the ventilation pipe buried layer in the vertical direction is 300mm. -1000mm, the thickness of the composite insulation layer in the vertical direction is 400mm-1200mm, the thickness of the sand cushion in the vertical direction is 300mm-600mm, the thickness of the outer ring wall in the horizontal direction is 300mm-600mm, and the thickness of the inner ring wall in the horizontal direction The thickness in the direction is 300mm-600mm.

Preferably, the thickness of the bottom end and the raft foundation in the vertical direction is 800mm-1800mm, the thickness of the graded sand and gravel layer in the vertical direction is 1200mm-2800mm, and the thickness of the ventilation pipe buried layer in the vertical direction is 500mm. -800mm, the thickness of the composite insulation layer in the vertical direction is 600mm-1000mm, the thickness of the sand cushion in the vertical direction is 350mm-550mm, the thickness of the outer ring wall in the horizontal direction is 350mm-550mm, and the thickness of the inner ring wall in the horizontal direction The thickness in the direction is 350mm-550mm.

Preferably, the thickness of the bottom end and the raft foundation in the vertical direction is 1000mm-1600mm, the thickness of the graded sand and gravel layer in the vertical direction is 1500mm-2500mm, and the thickness of the ventilation pipe buried layer in the vertical direction is 600mm. -700mm, the thickness of the composite insulation layer in the vertical direction is 700mm-900mm, the thickness of the sand cushion in the vertical direction is 400mm-500mm, the thickness of the outer ring wall in the horizontal direction is 400mm-500mm, and the thickness of the inner ring wall in the horizontal direction The thickness in the direction is 400mm-500mm.

Compared with the existing basis of solar high-temperature storage tanks, the present invention has the following advantages:

1. The present invention can realize the uniform bearing of the bottom plate of the high-temperature storage tank, thereby ensuring the free expansion and contraction of the bottom plate of the molten salt storage tank under the action of alternating temperature difference loads under various working conditions, thereby ensuring the safe and stable operation of the storage tank.

2. The grid structure of the graded sand and gravel layer of the present invention can effectively fix the sand and gravel in a region, thereby avoiding the large inclination or collapse of the bottom plate of the storage tank caused by the collapse or flow of local sand and gravel, thus Ensure the stability and security of the foundation.

3. The multiple temperature sensors provided in the inner ring wall leakage detection tank and the multiple temperature sensors in the outer ring wall leakage detection tank of the present invention can effectively monitor the leakage of the tank bottom plate and wall plate, and through the inner ring wall leakage detection tank, The structure and measurement points of the ring wall leakage detection tank and the outer ring wall leakage detection tank can accurately determine the initial leak location and provide a reference for tank repair. The leaked material can be collected into the molten salt leakage collection tank through the drainage pipeline. Properly dispose of them within the facility to avoid any impact on the environment.

To sum up, the basic structure of the present invention applied to high-temperature storage tanks has the advantages of convenient simulation design through computers, can truly reproduce the stress condition of the foundation of the storage tank, make the stress on the bottom plate of the high-temperature storage tank uniform, ensure the safety of the foundation, and release thermal stress. This ensures the safe operation of the storage tank, detects molten salt leakage in time, and recycles the leaked molten salt to avoid environmental pollution.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Description of the drawings

Figure 1 is a front cross-sectional view of a schematic structural diagram of a basic structure applied to a high-temperature storage tank according to the present invention;

Figure 2 is a partially enlarged structural schematic diagram of the basic structure of the present invention applied to high-temperature storage tanks along the horizontal cross-sectional direction where the inner ring wall leakage detection groove is located.

Detailed ways

As shown in Figures 1 and 2, the basic structure of the present invention applied to high-temperature storage tanks includes a raft foundation 7 arranged in the horizontal direction. The raft foundation 7 is made of reinforced concrete. The middle edge of the top of the raft foundation 7 A graded sand and gravel layer 6 is laid in the horizontal direction. A steel mesh is provided in the graded sand and gravel layer 6. The compaction coefficient of the graded sand and gravel layer 6 is above 0.98. The top of the graded sand and gravel layer 6 is laid with a steel mesh in the horizontal direction. The ventilation pipe buried layer 5 has a ventilation pipe 12 for heat exchange and cooling along the horizontal direction. One end of the ventilation pipe 12 is connected to the air outlet or air inlet of the cooling fan. The ventilation pipe 12 is provided with a plurality of Temperature sensor; when in use, natural ventilation and forced ventilation can be switched according to the temperature of the ventilation duct buried layer 5 to ensure that the temperature of the ventilation duct buried layer 5 is not higher than 70 degrees Celsius.

The top of the ventilation pipe buried layer 5 is laid with a composite insulation layer 4 along the horizontal direction. The top of the composite insulation layer 4 is laid with a sand cushion layer 2 along the horizontal direction. The sand used for the sand cushion layer 2 is high temperature resistant quartz sand. , a mesh inner ring wall leakage detection tank 3 is provided in the horizontal direction between the sand cushion layer 2 and the composite insulation layer 4, and a plurality of temperature sensors are provided in the inner ring wall leakage detection tank 3;

The outer walls of the sand cushion layer 2 and the composite insulation layer 4 are surrounded by an inner ring wall 1 in the vertical direction. The compressive strength of the inner ring wall 1 is not less than 5Mpa. The bottom end of the inner ring wall 1 is in contact with the ventilation The tops of the pipe buried layer 5 are close to each other, and the outer wall of the inner ring wall 1 is surrounded by a composite insulation layer 9 between the ring walls in the vertical direction. The bottom end of the composite insulation layer 9 between the ring walls is connected to the top of the ventilation pipe buried layer 5 Adjacent to each other, the top of the composite insulation layer 9 between the ring walls is provided with an annular outer ring wall leakage detection groove 10 along the horizontal direction, and the outer ring wall leakage detection groove 10 is provided with multiple temperature sensors;

The composite insulation layer 9 between the ring walls, the ventilation pipe buried layer 5 and the graded sand and gravel layer 6 are surrounded by an outer ring wall 8 in the vertical direction. The bottom end of the outer ring wall 8 is connected to the raft foundation 7 The top of the outer ring wall 8 is in contact with each other, and the inner wall of the outer ring wall 8 is in contact with the outer wall of the composite insulation layer 9, the ventilation pipe buried layer 5 and the graded sand and gravel layer 6. The outer ring wall 1 is made of reinforced refractory concrete or steel plate. production;

The bottom of the inner ring wall leakage detection tank 3 and the bottom of the outer ring wall leakage detection tank 10 are respectively provided with liquid outlets. The liquid outlet at the bottom of the inner ring wall leakage detection tank 3 and the bottom of the outer ring wall leakage detection tank 10 The liquid outlets are respectively connected to the molten salt leakage collection tank 11 through the drainage pipe 13, and the molten salt leakage collection tank 11 is arranged outside the outer ring wall 1;

The multiple temperature sensors provided in the inner ring wall leakage detection tank 3 and the multiple temperature sensors provided in the outer ring wall leakage detection tank 10 of the present invention can effectively monitor the leakage of the tank bottom plate and wall plate, and through The structure and measuring points of the inner ring wall leakage detection tank 3 and the outer ring wall leakage detection tank 10 can accurately determine the initial leakage position and provide a reference for tank repair. The leaked material can be collected into the melt through the drainage pipe 13 The salt leakage should be properly disposed of in the collection tank 11 to avoid impact on the environment.

As a further improvement of the present invention, the cross-section of the above-mentioned inner ring wall leakage detection groove 3 is rectangular, the cross-section of the outer ring wall leakage detection groove 10 is rectangular, and the cross-sections of the inner ring wall 1 and the outer ring wall 1 along the horizontal direction are circular. shape.

As a further improvement of the present invention, the thickness of the above-mentioned bottom end and raft foundation 7 along the vertical direction is 600mm-2000mm, the thickness of the graded sand and gravel layer 6 along the vertical direction is 1000mm-3000mm, and the ventilation pipe buried layer 5 is along the vertical direction. The thickness in the vertical direction is 300mm-1000mm, the thickness of the composite insulation layer 4 in the vertical direction is 400mm-1200mm, the thickness of the sand cushion layer 2 in the vertical direction is 300mm-600mm, and the thickness of the outer ring wall 8 in the horizontal direction is 300mm-600mm, the thickness of the inner ring wall 1 along the horizontal direction is 300mm-600mm.

As a further improvement of the present invention, the thickness of the above-mentioned bottom end and raft foundation 7 along the vertical direction is 800mm-1800mm, the thickness of the graded sand and gravel layer 6 along the vertical direction is 1200mm-2800mm, and the ventilation pipe buried layer 5 is along the vertical direction. The thickness in the vertical direction is 500mm-800mm, the thickness of the composite insulation layer 4 in the vertical direction is 600mm-1000mm, the thickness of the sand cushion layer 2 in the vertical direction is 350mm-550mm, and the thickness of the outer ring wall 8 in the horizontal direction is 350mm-550mm, the thickness of the inner ring wall 1 along the horizontal direction is 350mm-550mm.

As a further improvement of the present invention, the thickness of the above-mentioned bottom end and raft foundation 7 along the vertical direction is 1000mm-1600mm, the thickness of the graded sand and gravel layer 6 along the vertical direction is 1500mm-2500mm, and the ventilation pipe buried layer 5 is along the vertical direction. The thickness in the vertical direction is 600mm-700mm, the thickness of the composite insulation layer 4 in the vertical direction is 700mm-900mm, the thickness of the sand cushion layer 2 in the vertical direction is 400mm-500mm, and the thickness of the outer ring wall 8 in the horizontal direction is 400mm-500mm, the thickness of the inner ring wall 1 along the horizontal direction is 400mm-500mm.

When the membrane electrode distance sub-membrane electrolyzer buffer network of the present invention is used, the present invention can realize uniform bearing of the bottom plate of the high-temperature storage tank, thereby ensuring the free expansion and contraction of the bottom plate of the molten salt storage tank under the action of alternating temperature difference loads under various working conditions. This ensures the safe and stable operation of the storage tank; the grid structure of the graded sand and stone layer of the present invention can effectively fix the sand and gravel in a region, thereby avoiding serious damage to the storage tank due to local sand and gravel collapse or flow. Large inclination or collapse of the bottom plate, thereby ensuring the stability and safety of the foundation; the inner ring wall leakage detection system of the present invention has multiple temperature sensors provided in the inner ring wall leakage detection tank 3 and an outer ring wall leakage detection tank 10. Some multiple temperature sensors can effectively monitor the leakage of the tank bottom plate and wall plate, and accurately determine the initial leakage position through the structure and measuring point settings of the inner ring wall leakage detection tank 3 and the outer ring wall leakage detection tank 10 , providing a reference basis for storage tank repair. The leaked materials can be collected into the molten salt leakage collection tank 11 through the drainage pipeline 13 for proper treatment to avoid impact on the environment. Therefore, the basic structure of the present invention applied to high-temperature storage tanks has the advantages of convenient simulation design through computers, which can truly reproduce the stress condition of the foundation of the storage tank, make the stress on the bottom plate of the high-temperature storage tank uniform, ensure the safety of the foundation, and release thermal stress, thereby It ensures the safe operation of the storage tank, detects molten salt leakage in time, and recycles the leaked molten salt to avoid environmental pollution.

The above-described embodiments are only descriptions of preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, ordinary engineers and technicians in the art may make various modifications to the technical solutions of the present invention. and improvements shall fall within the protection scope determined by the claims of the present invention.

Claims

The basic structure applied to high-temperature storage tanks is characterized by: including a raft foundation (7) arranged along the horizontal direction. The raft foundation (7) is made of reinforced concrete, and the middle of the top of the raft foundation (7) is along the horizontal direction. A graded sand and gravel layer (6) is laid, and a steel mesh is provided in the graded sand and gravel layer (6). The compaction coefficient of the graded sand and gravel layer (6) is above 0.98. A ventilation pipe buried layer (5) is laid along the horizontal direction on the top. A ventilation pipe (12) for heat exchange and cooling is provided in the horizontal direction within the ventilation pipe buried layer (5). One end of the ventilation pipe (12) is connected to the outlet of the cooling fan. The air outlets or air inlets are connected, and the ventilation pipe (12) is provided with multiple temperature sensors;

The top of the ventilation pipe buried layer (5) is laid with a composite insulation layer (4) in the horizontal direction, and the top of the composite insulation layer (4) is laid with a sand cushion (2) in the horizontal direction. The sand cushion (2) ) The sand and gravel used are high-temperature-resistant quartz sand, and a mesh inner ring wall leakage detection slot (3) is provided in the horizontal direction between the sand cushion layer (2) and the composite insulation layer (4). There are multiple temperature sensors inside the tank (3);

An inner ring wall (1) is arranged around the outer walls of the sand cushion layer (2) and the composite insulation layer (4) in the vertical direction. The bottom end of the inner ring wall (1) is connected to the ventilation pipe buried layer (5). ) are in contact with each other at the top. The outer wall of the inner ring wall (1) is surrounded by an inter-ring wall composite insulation layer (9) in the vertical direction. The bottom end of the inter-ring wall composite insulation layer (9) is connected to the ventilation pipe buried layer. (5) are adjacent to each other, and the top of the composite insulation layer (9) between the ring walls is provided with an annular outer ring wall leakage detection groove (10) along the horizontal direction, and the outer ring wall leakage detection groove (10) is provided with a plurality of Temperature Sensor;

There is an outer ring wall (8) surrounding the outer wall of the composite insulation layer (9), the ventilation pipe buried layer (5) and the graded sand and gravel layer (6) in the vertical direction. The outer ring wall (8) The bottom end of 8) is in contact with the top of the raft foundation (7), and the composite insulation layer (9), ventilation pipe buried layer (5) and graded sand and gravel layer (5) between the inner wall of the outer ring wall (8) and the ring wall The outer walls of 6) are in contact with each other, and the outer ring wall (1) is made of reinforced refractory concrete or steel plates;

The bottom of the inner ring wall leakage detection tank (3) and the bottom of the outer ring wall leakage detection tank (10) are respectively provided with liquid outlets. The liquid outlets at the bottom of the inner ring wall leakage detection tank (3) and the outer ring wall The liquid outlet at the bottom of the leakage detection tank (10) is connected to the molten salt leakage collection tank (11) through the drainage pipe (13), and the molten salt leakage collection tank (11) is arranged outside the outer ring wall (1);
The basic structure used in high-temperature storage tanks according to claim 1, characterized in that: the inner ring wall leakage detection groove (3) has a rectangular cross-section, and the outer ring wall leakage detection groove (10) has a rectangular cross-section, The cross-sections of the inner ring wall (1) and the outer ring wall (1) along the horizontal direction are circular.
The basic structure used in high-temperature storage tanks according to claim 2, characterized in that: the thickness of the bottom end and the raft foundation (7) in the vertical direction is 600mm-2000mm, and the graded sand and gravel layer (6) The thickness along the vertical direction is 1000mm-3000mm, the thickness of the ventilation pipe buried layer (5) along the vertical direction is 300mm-1000mm, the thickness of the composite insulation layer (4) along the vertical direction is 400mm-1200mm, and the sand cushion layer (2) The thickness along the vertical direction is 300mm-600mm, the thickness of the outer ring wall (8) along the horizontal direction is 300mm-600mm, and the thickness of the inner ring wall (1) along the horizontal direction is 300mm-600mm.
The basic structure used in high-temperature storage tanks according to claim 3, characterized in that: the thickness of the bottom end and the raft foundation (7) in the vertical direction is 800mm-1800mm, and the graded sand and gravel layer (6) The thickness along the vertical direction is 1200mm-2800mm, the thickness of the ventilation pipe buried layer (5) along the vertical direction is 500mm-800mm, the thickness of the composite insulation layer (4) along the vertical direction is 600mm-1000mm, and the sand cushion layer (2) The thickness along the vertical direction is 350mm-550mm, the thickness of the outer ring wall (8) along the horizontal direction is 350mm-550mm, and the thickness of the inner ring wall (1) along the horizontal direction is 350mm-550mm.
The basic structure used in high-temperature storage tanks according to claim 4, characterized in that: the thickness of the bottom end and the raft foundation (7) in the vertical direction is 1000mm-1600mm, and the graded sand and gravel layer (6) The thickness along the vertical direction is 1500mm-2500mm, the thickness of the ventilation pipe buried layer (5) along the vertical direction is 600mm-700mm, the thickness of the composite insulation layer (4) along the vertical direction is 700mm-900mm, and the sand cushion layer (2) The thickness along the vertical direction is 400mm-500mm, the thickness of the outer ring wall (8) along the horizontal direction is 400mm-500mm, and the thickness of the inner ring wall (1) along the horizontal direction is 400mm-500mm.