Double-layer storage tank with composite structure

Abstract

The invention belongs to the technical field of storage equipment, and relates to a double-layer storage tank with a composite structure. The storage tank comprises an outer-layer pressure-bearing shell, an inner-layer sealing bag, an intelligent interlayer arranged between the inner layer and the outer layer, and a monitoring system integrated in the intelligent interlayer. The outer-layer pressure-bearing shell is formed by winding a carbon fiber composite material, the inner-layer sealing bag is made of a nano self-repairing fluoropolymer film, and the intelligent interlayer is filled with intelligent aerogel and is provided with an optical fiber sensing network. The pressure of the interlayer is adjusted in real time through the dynamic pressure balance system, self-repairing of microcracks of the inner capsule is achieved through the self-healing material, the multi-physics coupling monitoring technology is combined, real-time health monitoring, leakage early warning and self-adaptive protection of the storage tank are achieved, the safety performance of the storage tank is remarkably improved, and the service life of the storage tank is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the technical field of storage devices, and more particularly to a composite structure double-layer storage tank. Background Technology

[0002] Underground storage tanks are widely used in the petroleum, chemical, and energy industries to store various liquid materials. Traditional underground storage tanks mostly use single-layer steel structures, which have problems such as susceptibility to corrosion, high risk of leakage, and outdated monitoring methods. According to estimates by the U.S. Environmental Protection Agency (EPA), about 70% of underground steel oil tanks that have been in use for 15 years may have a risk of leakage. Leaked oil or other chemicals can cause serious pollution to groundwater and soil, and the cost of remediation is very high.

[0003] In existing technologies, double-walled storage tanks are frequently used. Currently, the main double-walled storage tank technologies include composite structures (SF tanks) with a steel inner tank and a glass fiber reinforced plastic (FRP) outer tank: these tanks have simple manufacturing processes and low costs. Alternatively, all-fiberglass (FRP) double-walled storage tanks can be used: these offer better corrosion resistance and longer service life.

[0004] The two types of storage tanks mentioned above still have limited monitoring capabilities and require regular maintenance. Furthermore, they are not very adaptable and have limited ability to cope with extreme conditions (such as earthquakes and large temperature changes). Summary of the Invention

[0005] The purpose of this invention is to provide a composite structure double-layer storage tank to solve the problems of monitoring lag, insufficient safety redundancy, high maintenance costs and poor adaptability in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A composite double-layer storage tank, comprising: The outer pressure-bearing shell, the inner sealing bladder, the intelligent interlayer, the dynamic pressure balancing system, and the monitoring system; The intelligent interlayer is disposed between the outer pressure-bearing shell and the inner sealing bladder; The dynamic pressure balancing system is connected to the intelligent interlayer; A monitoring system is installed in the intelligent interlayer to monitor the structural health status and leakage of the storage tank in real time; The outer pressure-bearing shell is a pressure-bearing structure made of fiber-reinforced composite material; The inner sealing bladder is a polymer film with self-healing function; The smart interlayer is filled with a functional filling material.

[0007] As a preferred embodiment of the present invention, the outer pressure-bearing shell is made of a fiber-reinforced composite material, wherein the fiber-reinforced composite material includes at least one of carbon fiber, glass fiber, and aramid fiber combined with a thermosetting or thermoplastic resin matrix; preferably, it is a carbon fiber / epoxy resin composite material. The outer pressure-bearing shell is formed by a winding process.

[0008] As a preferred embodiment of the present invention, the polymer used in the inner sealing bladder is a fluoropolymer, preferably polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), or fluorinated ethylene propylene copolymer (FEP). The inner sealing capsule contains self-healing microcapsules, the shell material of which is urea-formaldehyde resin, melamine-formaldehyde resin or gelatin, and the core material is silane-terminated polyurethane, cyclopentadiene dimer or epoxy resin.

[0009] As a preferred embodiment of the present invention, at least one of carbon nanotubes, graphene, or metal nanowires is added to the inner sealing bladder, with an addition amount of 0.5% to 5% by weight; the thickness of the inner sealing bladder is 0.5 mm to 5 mm.

[0010] As a preferred embodiment of the present invention, the functional filling material filled in the intelligent interlayer is aerogel, expanded perlite, or vacuum insulation board. The functional filler material has thermal insulation properties, and its thermal conductivity is less than 0.05 W / (m·K).

[0011] As a preferred embodiment of the present invention, the monitoring system includes at least two of the following: an optical fiber sensor network, an ultrasonic guided wave sensor array, and a microwave dielectric constant probe. The fiber optic sensing network includes fiber Bragg grating sensors deployed in the smart interlayer for monitoring strain and temperature. The ultrasonic guided wave sensing array includes a piezoelectric ultrasonic transducer arranged on the tank wall for exciting and receiving guided waves to monitor the wall thickness reduction and defects of the inner sealing bladder. The microwave dielectric constant probe is used to monitor the change in the dielectric constant of the medium in the smart interlayer.

[0012] As a preferred embodiment of the present invention, the dynamic pressure balancing system includes a pressure sensor, a control unit, and a regulating valve; The pressure sensor is used to monitor the pressure within the smart interlayer; The control unit receives pressure sensor signals and calculates control commands based on the pressure fluctuations of the inner sealing bladder. The regulating valve operates according to the instructions of the control unit to adjust the pressure of the intelligent interlayer, so that the pressure difference between the inner and outer layers is maintained within a set range.

[0013] As a preferred embodiment of the present invention, the intelligent interlayer is pre-embedded with filamentous adhesive tape for supporting and forming pressure-balanced microchannels, and the filamentous adhesive tape is made of PET, PP or PA material.

[0014] As a preferred embodiment of the present invention, the storage tank is a horizontal cylindrical structure, suitable for underground or soil-covered installation; the bottom of the storage tank is provided with a continuous sand bed foundation, and the upper part and the sides of the storage tank are covered with soil; the manhole and all openings of the storage tank are centrally arranged at the top of the tank.

[0015] The beneficial effects of this invention are: 1. Through a dual-layer structure, combined with real-time monitoring and self-healing capabilities, the risk of leakage is greatly reduced, and safety is significantly improved.

[0016] 2. Through physical-level coupling monitoring of at least two of the following: fiber optic sensor networks, ultrasonic guided wave sensor arrays, and microwave dielectric constant probes, early warning and precise positioning can be achieved, demonstrating advanced monitoring capabilities.

[0017] 3. By combining the outer and inner layers of materials, the corrosion resistance and self-healing properties of the storage tank are improved, thereby extending the service life of the storage tank.

[0018] 4. The dynamic pressure balancing system and reinforced structural design enhance the ability to cope with extreme working conditions and improve environmental adaptability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the double-layer storage tank of the present invention; Figure 2 This is a schematic diagram of the radial cross-sectional structure of the double-layer storage tank of the present invention; Figure 3 This is a block diagram of the monitoring system architecture; Figure 4 This is a block diagram of a dynamic pressure balance system.

[0020] Legend: 1. Outer pressure-bearing shell; 2. Inner sealing capsule; 21. Self-healing microcapsule; 3. Intelligent interlayer; 31. Filamentous tape; 4. Dynamic pressure balancing system; 41. Pressure sensor; 42. Control unit; 43. Regulating valve; 5. Monitoring system; 51. Fiber optic sensor network; 52. Ultrasonic guided wave sensor array; 53. Microwave dielectric constant probe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: like Figures 1 to 4 As shown, a composite double-layer storage tank includes: an outer pressure-bearing shell 1, an inner sealing bladder 2, an intelligent interlayer 3, a dynamic pressure balancing system 4, and a monitoring system 5; the intelligent interlayer 3 is disposed between the outer pressure-bearing shell 1 and the inner sealing bladder 2.

[0023] like Figure 1 and Figure 2 As shown, the functional filler material in the intelligent interlayer 3 is aerogel, expanded perlite, or vacuum insulation board; the functional filler material has thermal insulation properties, and its thermal conductivity is less than 0.05 W / (m·K). Through the functional filler material, thermal insulation and vacuum isolation can be achieved, improving the thermal insulation performance of the storage tank. Filamentous adhesive tape 31, made of PET, PP, or PA material, is pre-embedded in the intelligent interlayer 3 to support and form pressure-balanced microchannels, thereby improving the overall strength.

[0024] The intelligent interlayer 3 is equipped with a monitoring system 5 to monitor the structural health status and leakage of the storage tank in real time.

[0025] like Figure 3 As shown, the monitoring system 5 includes at least two of the following: fiber optic sensor network 51, ultrasonic guided wave sensor array 52, and microwave dielectric constant probe 53; by using two or more monitoring systems 5 at the physical level, the conditions inside the double-layer storage tank are monitored, enabling the double-layer storage tank to operate stably.

[0026] Among them, the fiber optic sensing network 51 includes fiber optic grating sensors deployed in the smart interlayer 3 for monitoring strain and temperature; the ultrasonic guided wave sensing array 52 includes piezoelectric ultrasonic transducers arranged on the tank wall for exciting and receiving guided waves to monitor the wall thickness reduction and defects of the inner sealing bladder 2; and the microwave dielectric constant probe 53 is used to monitor the change of dielectric constant of the medium in the smart interlayer 3.

[0027] like Figures 1 to 4As shown, the dynamic pressure balancing system 4 is connected to the intelligent interlayer 3; the dynamic pressure balancing system 4 includes a pressure sensor 41, a control unit 42, and a regulating valve 43; the pressure sensor 41 is used to monitor the pressure inside the intelligent interlayer 3; the control unit 42 receives the signal from the pressure sensor 41 and calculates control commands based on the pressure fluctuations of the inner sealing bladder 2; the regulating valve 43 operates according to the commands of the control unit 42 to adjust the pressure of the intelligent interlayer 3 so that the pressure difference between the inner and outer layers is maintained within a set range.

[0028] The outer pressure-bearing shell 1 is a pressure-bearing structure made of fiber-reinforced composite material; the inner sealing bladder 2 is a polymer film with self-healing function; the smart interlayer 3 is filled with functional filler material.

[0029] like Figure 1 As shown, the outer pressure shell 1 is made of fiber-reinforced composite material, which includes at least one of carbon fiber, glass fiber, and aramid fiber combined with a thermosetting or thermoplastic resin matrix; preferably, it is a carbon fiber / epoxy resin composite material; the outer pressure shell 1 is formed by a winding process.

[0030] The inner sealing bladder 2 is made of a fluoropolymer, preferably polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), or fluorinated ethylene propylene copolymer (FEP). Self-healing microcapsules 21 are dispersed within the inner sealing bladder 2. The shell material of the self-healing microcapsules 21 is urea-formaldehyde resin, melamine-formaldehyde resin, or gelatin, and the core material is silane-terminated polyurethane, cyclopentadiene dimer, or epoxy resin. Through the self-healing microcapsules 21, the inner sealing bladder 2 can self-repair, thereby reducing damage to the inner layer and improving overall environmental adaptability.

[0031] The inner sealing capsule 2 also contains at least one of carbon nanotubes, graphene, or metal nanowires, at a weight percentage of 0.5% to 5%; the thickness of the inner sealing capsule 2 is 0.5 mm to 5 mm. The strength of the inner sealing capsule 2 is improved by adding at least one of carbon nanotubes, graphene, or metal nanowires.

[0032] Meanwhile, the storage tank has a horizontal cylindrical structure, suitable for underground or soil-covered installation; the bottom of the storage tank is equipped with a continuous sand bed foundation, and the top and sides of the storage tank are covered with soil; the manhole and all openings of the storage tank are centrally located at the top of the tank.

[0033] In summary, the dual-layer structure, combined with real-time monitoring and self-healing capabilities, significantly reduces leakage risk and greatly enhances safety. Early warning and precise location are achieved through physical-level coupling monitoring using at least two of the following: fiber optic sensor network 51, ultrasonic guided wave sensor array 52, and microwave dielectric constant probe 53. The combination of outer and inner layer materials improves the storage tank's corrosion resistance and self-healing properties, thereby extending its service life. The dynamic pressure balancing system 4 and reinforced structural design enhance its ability to withstand extreme operating conditions and improve environmental adaptability.

[0034] All the devices selected in this application are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0035] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A composite structure double-layer storage tank, characterized in that, include: The outer pressure shell (1), the inner sealing bladder (2), the intelligent interlayer (3), the dynamic pressure balance system (4), and the monitoring system (5) are all included. The intelligent interlayer (3) is disposed between the outer pressure-bearing shell (1) and the inner sealing bladder (2); The dynamic pressure balancing system (4) is connected to the intelligent interlayer (3); A monitoring system (5) is installed in the intelligent interlayer (3) to monitor the structural health status and leakage of the storage tank in real time; The outer pressure shell (1) is a pressure-bearing structure made of fiber-reinforced composite material; The inner sealing bladder (2) is a polymer film with self-healing function; The smart interlayer (3) is filled with a functional filling material.

2. The composite structure double-layer storage tank as described in claim 1, characterized in that, The outer pressure shell (1) is made of fiber-reinforced composite material, which includes at least one of carbon fiber, glass fiber, and aramid fiber combined with a thermosetting or thermoplastic resin matrix. The outer pressure shell (1) is formed by a winding process.

3. A composite structure double-layer storage tank as described in claim 2, characterized in that, The inner sealing bladder (2) is made of a fluoropolymer, specifically polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), or fluorinated ethylene propylene copolymer (FEP). The inner sealing capsule (2) contains self-healing microcapsules (21), the shell material of which is urea formaldehyde resin, melamine formaldehyde resin or gelatin, and the core material is silane-terminated polyurethane, cyclopentadiene dimer or epoxy resin.

4. A composite structure double-layer storage tank as described in claim 3, characterized in that, The inner sealing bladder (2) also contains at least one of carbon nanotubes, graphene or metal nanowires, with an addition amount of 0.5% to 5% by weight; the thickness of the inner sealing bladder (2) is 0.5 mm to 5 mm.

5. A composite structure double-layer storage tank as described in claim 4, characterized in that, The functional filling material in the intelligent interlayer (3) is aerogel, expanded perlite, or vacuum insulation board; The functional filler material has thermal insulation properties and its thermal conductivity is less than 0.05 W / (m·K).

6. A composite structure double-layer storage tank as described in claim 5, characterized in that, The monitoring system (5) includes at least two of the following: fiber optic sensor network (51), ultrasonic guided wave sensor array (52), and microwave dielectric constant probe (53); The fiber optic sensing network (51) includes fiber optic grating sensors deployed in the smart interlayer (3) for monitoring strain and temperature; The ultrasonic guided wave sensing array (52) includes a piezoelectric ultrasonic transducer arranged on the tank wall for exciting and receiving guided waves to monitor the wall thickness reduction and defects of the inner sealing bladder (2). The microwave dielectric constant probe (53) is used to monitor the change of dielectric constant of the medium in the smart interlayer (3).

7. A composite structure double-layer storage tank as described in claim 6, characterized in that, The dynamic pressure balancing system (4) includes a pressure sensor (41), a control unit (42), and a regulating valve (43); The pressure sensor (41) is used to monitor the pressure inside the smart interlayer (3); The control unit (42) receives the signal from the pressure sensor (41) and calculates the control command based on the pressure fluctuation of the inner sealing bladder (2); The regulating valve (43) operates according to the instructions of the control unit (42) to regulate the pressure of the intelligent interlayer (3) so that the pressure difference between the inner and outer layers is maintained within the set range.

8. A composite structure double-layer storage tank as described in claim 7, characterized in that, The intelligent interlayer (3) is pre-embedded with filamentous tape (31) for supporting and forming pressure-balanced microchannels. The filamentous tape (31) is made of PET, PP or PA material.

9. A composite structure double-layer storage tank as described in claim 8, characterized in that, The storage tank has a horizontal cylindrical structure, suitable for underground or soil-covered installation; The bottom of the storage tank is provided with a continuous sand bed foundation, and the top and sides of the storage tank are covered with soil. The manholes and all openings of the storage tank are centrally located at the top of the tank.

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