Liquefied hydrocarbon storage tank system covered by prefabricated hole body

Abstract

The invention provides a liquefied hydrocarbon storage tank system covered with a prefabricated hole body. The liquefied hydrocarbon storage tank system comprises a liquefied hydrocarbon storage tank body, the concrete prefabricated hole body, a storage tank body support, a basin type support and a fire-fighting spraying system. The liquefied hydrocarbon storage tank body is connected with a bottom foundation of the concrete prefabricated hole body through the storage tank body support, the concrete prefabricated hole body surrounds the periphery of the storage tank, and a certain interval is kept between the liquefied hydrocarbon storage tank body and the concrete prefabricated hole body; the basin-type support is arranged between a liquefied hydrocarbon storage tank support and a base on a bottom foundation so as to provide the capacity of transverse displacement of the storage tank; the fire-fighting spraying systems are uniformly arranged on the inner side of the concrete prefabricated hole body; the liquefied hydrocarbon tank area comprises a plurality of liquefied hydrocarbon storage tank bodies, and each liquefied hydrocarbon storage tank body is independently sealed in the corresponding independent prefabricated hole body. The problem that deep inspection is difficult to carry out in a traditional soil covering type storage tank system can be solved, inspection and defect repair of the storage tank can be completed without removing covering soil, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of finished oil storage tanks, and in particular to a liquefied hydrocarbon storage tank system covered by a prefabricated cave body. Background Art

[0002] Liquefied hydrocarbon storage tanks are large storage tanks for storing flammable and explosive gases such as liquefied petroleum gas and liquefied natural gas. When designing and building liquefied hydrocarbon storage tanks, their safety must be taken into consideration, including the structural design of the tank itself, material selection, construction quality control and other aspects. Traditional liquefied hydrocarbon storage tank systems that use prefabricated caverns to cover, such as the European earth-covered storage tank system, have improved the safety of the storage tanks to a certain extent, but there are still some potential risks in actual applications. For example, the entire storage tank is covered with sand and gravel, which makes regular inspections and defect repairs difficult and cannot meet the requirements of domestic pressure vessel specifications. Secondly, the storage tank itself will expand and contract due to temperature, and the surrounding covering sand and gravel will cause excessive bending moments during the expansion process. The European guidelines have strict restrictions on the aspect ratio of the storage tank (the ratio of the length of the storage tank to the diameter), which should not exceed 8, which greatly limits the volume of the storage tank. Thirdly, there are certain errors in the construction of the sand bed itself, which causes the storage tank to be placed on the sand bed and cannot fit tightly, causing the storage tank to have a certain inclination. At the same time, the uneven settlement of the sand bed will also cause uneven force on the storage tank, leaving certain potential risks. Summary of the invention

[0003] The object of the present invention is to provide a liquefied hydrocarbon storage tank system covered by a prefabricated cavern in view of the deficiencies of the prior art.

[0004] The specific technical solutions are as follows:

[0005] A liquefied hydrocarbon storage tank system covered by a prefabricated cavern, comprising a liquefied hydrocarbon storage tank body, a concrete prefabricated cavern, a storage tank body support, a basin support and a fire sprinkler system; wherein:

[0006] The liquefied hydrocarbon storage tank body is connected to the bottom foundation of the prefabricated concrete cavity through the storage tank body support. The prefabricated concrete cavity surrounds the storage tank to form a closed protective shell, and a certain distance is maintained between the liquefied hydrocarbon storage tank body and the prefabricated concrete cavity;

[0007] The pot-type support is arranged between the liquefied hydrocarbon storage tank support and the base on the bottom foundation to provide the storage tank with the ability to move laterally, allowing the storage tank to move freely during thermal expansion and contraction;

[0008] The fire sprinkler system is evenly arranged on the inner side of the prefabricated concrete cavity, and the nozzle of the fire sprinkler system is aimed at the center of the liquefied hydrocarbon storage tank body and covers the liquefied hydrocarbon storage tank body;

[0009] The liquefied hydrocarbon tank area includes a plurality of liquefied hydrocarbon storage tank bodies, each of which is independently enclosed in an independent prefabricated cavern.

[0010] Optionally, combustible gas detectors are arranged in sub-areas inside the precast concrete cavity to detect leaking gas in a timely manner.

[0011] Optionally, both ends of the prefabricated concrete cavity are sealed with refractory brick walls, and only a door for people to enter and exit is reserved on the ground, using refractory materials.

[0012] Optionally, the external reinforcement of the liquefied hydrocarbon storage tank body adopts a cross arrangement of double ring ribs and single ring ribs.

[0013] Optionally, the precast concrete cavity includes a precast vault and a precast plate, the lower end of the precast plate is fixedly connected to the bottom foundation, and the precast vault is arranged on the precast plate.

[0014] Optionally, the connection between the prefabricated panel and the bottom foundation adopts high-strength anchors.

[0015] Optionally, the connection between the prefabricated vault and the prefabricated slab is cast on site to form a seamless connection, thereby improving the stability of the overall structure.

[0016] Optionally, a sand and gravel filling layer is provided between the prefabricated vaults, and then the upper surface is cast with plain concrete.

[0017] Optionally, the prefabricated arch as a whole forms a drainage slope of 100:1 to avoid rainwater accumulation.

[0018] Optionally, an elastic gasket is provided between the pot-type support and the liquefied hydrocarbon storage tank body to further alleviate stress caused by temperature changes in the storage tank and enhance the seismic resistance of the storage tank.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This application solves the problem of difficulty in deep inspection in traditional earth-covered tank systems by reserving a gap between the precast concrete cavity and the liquefied hydrocarbon storage tank body. The inspection and defect repair of the tank can be completed without removing the covering soil, which complies with the requirements of national pressure vessel specifications and improves maintenance efficiency. The pot-type support allows the tank to expand and contract freely when the temperature changes, effectively alleviating bending stress, breaking the European tank aspect ratio limit, and broadening the tank volume potential. The structure of the precast concrete cavity is more stable, reducing the uncertainty caused by sand and stone construction, avoiding tank tilting and uneven force caused by uneven settlement of the sand bed, and eliminating potential safety hazards. The fire sprinkler system is integrated and precisely positioned to ensure rapid response, significantly improving fire extinguishing efficiency and surpassing the limitations of traditional systems. Each tank is wrapped in an independent precast cavity to effectively isolate mutual interference, reduce the possibility of chain reactions, and enhance safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the liquefied hydrocarbon storage tank body and the prefabricated concrete cavern;

[0022] Figure 2 This is a schematic diagram of the structure with closed ends of the prefabricated cavern;

[0023] Figure 3 This is a schematic diagram of the tank farm layout and the arch sand filling treatment structure;

[0024] Figure 4 It is a structural schematic diagram of the connection between the liquefied hydrocarbon storage tank body and the support.

[0025] Reference numerals:

[0026] 1. Liquefied hydrocarbon storage tank body; 101. Cylinder; 102. Manhole; 103. Head; 104. Drain pipe interface; 105. Instrument pipe interface; 2. External reinforcement ribs; 3. Prefabricated vault; 4. Combustible gas detector; 5. Prefabricated plate; 6. Storage tank body support; 7. Basin support; 8. Base; 9. Bottom foundation; 10. Anchor bolts; 11. Fire sprinkler system; 12. Sand and gravel filling layer; 13. Refractory brick wall; 14. Refractory door. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0030] The liquefied hydrocarbon storage tank system provided by the present invention using a prefabricated cavern covering is referred to Figure 1-Figure 4 , including a liquefied hydrocarbon storage tank body 1, a prefabricated concrete cavern, a storage tank body support 6, a basin support 7 and a fire sprinkler system 11; wherein:

[0031] The liquefied hydrocarbon storage tank body 1 is connected to the bottom foundation 9 of the prefabricated concrete cavity through the storage tank body support 6. The prefabricated concrete cavity surrounds the storage tank to form a closed protective shell, and a certain distance is maintained between the liquefied hydrocarbon storage tank body 1 and the prefabricated concrete cavity.

[0032] The pot-type support 7 is arranged between the liquefied hydrocarbon storage tank support and the base 8 on the bottom foundation 9 to provide the storage tank with the ability to move laterally, allowing the storage tank to move freely during thermal expansion and contraction;

[0033] The fire sprinkler system 11 is evenly arranged inside the prefabricated concrete cavity, and the nozzle of the fire sprinkler system 11 is aimed at the center of the liquefied hydrocarbon storage tank body 1 and covers the liquefied hydrocarbon storage tank body 1;

[0034] The liquefied hydrocarbon tank area includes a plurality of liquefied hydrocarbon storage tank bodies 1, and each liquefied hydrocarbon storage tank body 1 is independently enclosed in an independent prefabricated cave.

[0035] In this embodiment, refer to Figure 4The liquefied hydrocarbon storage tank body 1 is composed of a cylinder 101, a head 103, a manhole 102, a liquid inlet and outlet interface, an instrument pipe interface 105, etc. The material is preferably high-pressure resistant and corrosion-resistant alloy steel to ensure the stability of the medium inside the tank. The inner lining is specially coated to prevent the liquefied hydrocarbon from directly corroding the metal wall and extend the life of the tank. The external design of the liquefied hydrocarbon storage tank body 1 is cylindrical, with a pressure release valve on the top and an emptying pipeline at the bottom to ensure safe operation. In addition, the internal body of the liquefied hydrocarbon storage tank 1 is provided with external reinforcement ribs 2. The precast concrete cave body is constructed with high-strength and high-fire-resistant precast concrete materials. The thickness is customized according to the size of the tank. A closed cavity is formed around the tank. The bottom of the precast concrete cave body is firmly connected to the ground foundation. A certain gap is reserved between the precast concrete cave body and the liquefied hydrocarbon storage tank body 1 for easy inspection and maintenance. The inner wall is coated with waterproof and moisture-proof coatings to enhance the structural integrity. The tank body support 6 and the basin support 7 are both made of high-strength steel with large bearing capacity and adaptable to various geological conditions. The basin support 7 is embedded in the prefabricated concrete cavity and the bottom of the tank, allowing the tank to move in any direction during thermal expansion and contraction, reducing stress accumulation. The nozzles of the fire sprinkler system 11 are densely arranged, and the spraying angle is precisely pointed to the center of the tank, with a wide coverage area and high fire extinguishing efficiency. In addition, the supporting water source is sufficient and the pressure is constant, ensuring that the fire extinguishing procedure can be started at any time. The layout of the liquefied hydrocarbon tank area has multiple tanks distributed independently with appropriate distances between each other to reduce the risk of chain reactions. Each tank is surrounded by an independent prefabricated cavity. Even if a single tank has a problem, it will not affect the surrounding area. Firebreaks are set up at the edge of the tank area to effectively block leaked liquids and avoid environmental pollution.

[0036] In this embodiment, refer to Figure 1 , combustible gas detectors 4 are arranged in different areas inside the prefabricated concrete cave to detect leaking gas in time. Combustible gas detectors 4 such as electrochemical, catalytic combustion, infrared absorption or semiconductor can be selected, and appropriate sensing technology can be selected according to the characteristics of different types of gases to ensure high accuracy and rapid response. In the preset area around the liquefied hydrocarbon storage tank body 1, especially near the tank inlet and outlet, valves and locations prone to leakage, a multi-level detection network is formed. The specific gravity of the gas should be taken into account. If the liquefied hydrocarbon is heavier than the air, the detector should be installed at a relatively low position, otherwise it should be installed at a higher position to capture gases of different densities. The number of detectors is determined according to the size and shape of the tank. In principle, it should be ensured that all possible leakage points are within the detection range. It is generally recommended to install at least one detector at a certain distance (such as about 10 meters). For large storage tanks or complex layouts, a grid layout strategy is adopted to ensure full area coverage without leaving dead ends.

[0037] Specifically, refer to Figure 2The two ends of the concrete prefabricated cave are sealed with refractory bricks to form refractory brick walls 13, and only a door for people to enter and exit is reserved on the ground, and refractory materials are used to form a fire-resistant door. Among them, the refractory bricks are selected from high-temperature resistant and high-strength refractory bricks, which can resist high-temperature flames and have good thermal insulation properties. During construction, first, clean the surfaces at both ends of the precast concrete cavity to remove dust, oil and other impurities to ensure that the wall surface is flat and dry; then measure and mark the position of the brick wall to ensure that the two walls are parallel and perpendicular to the ground to pave the way for subsequent operations; secondly, apply refractory mud to the back of the first refractory brick and place it stably in the designated position to ensure that the mud fills the gaps. Use a brick knife or other tools to smooth the mud to avoid excessive accumulation or omissions, ensure that each layer of bricks is firmly bonded, and lay bricks layer by layer from the bottom layer. Each brick is tightly bonded to the adjacent bricks with refractory mud. Pay attention to the width of the brick joints, which should not exceed the specified value. After each row is laid, use a level to check the verticality and flatness of the wall and make fine adjustments if necessary to ensure that the bricks are The linearity and overall beauty of the wall; mark the location of the main door at ground height, reserve an opening in advance to ensure that the passage is unobstructed, and use refractory materials to seal the edges around the opening to enhance the structural strength of the door frame and balance the overall fire resistance; add additional refractory materials between the brick wall and the contact surface of the precast concrete cavity, such as expanded perlite board, calcium silicate board, etc., to enhance the thermal insulation effect. This material can effectively prevent heat conduction and reduce the impact on internal storage tanks. It is also part of a good fire barrier; finally, after the entire wall construction project is completed, conduct a comprehensive inspection to confirm that there are no cracks or falling off, ensure that the wall quality meets the standards, clean up the construction site, handle the remaining materials, keep the work area clean, and prepare for the next step or put it into use.

[0038] In this embodiment, refer to Figure 1 The external reinforcement of the liquefied hydrocarbon storage tank body 1 adopts a cross arrangement of double ring ribs and single ring ribs. Circumferential and longitudinal reinforcement ribs are arranged on the outer wall of the storage tank to form an interlaced network, which can disperse and carry various loads, especially wind pressure, seismic force and deformation force caused by the contents. This arrangement can effectively improve the tensile, bending and torsional rigidity of the storage tank, and reduce stress concentration caused by temperature changes and internal pressure fluctuations.

[0039] Specifically, refer to Figure 1The concrete prefabricated cave body includes a prefabricated vault 3 and a prefabricated panel 5. The lower end of the prefabricated panel 5 is fixedly connected to the bottom foundation 9, and the prefabricated vault 3 is arranged on the prefabricated panel 5. In this embodiment, the connection between the prefabricated vault 3 and the prefabricated panel 5 is cast on site. The on-site casting method ensures that the interface between the vault and the prefabricated panel 5 is completely sealed, enhances the integrity of the entire structure, improves the overall wind resistance and earthquake resistance, and effectively prevents moisture penetration, protecting internal facilities from corrosion; the connection between the prefabricated panel 5 and the bottom foundation 9 adopts a high-strength anchor, and the high-strength anchor can be connected with anchor bolts 10. This connection method can withstand large tension and shear force, ensuring that under various environmental conditions, the prefabricated panel 5 and the bottom foundation 9 always maintain a stable connection, providing solid support for the liquefied hydrocarbon storage tank body 1.

[0040] Reference Figure 3 A gravel filling layer 12 is provided above the multiple prefabricated vaults 3. A layer of gravel is laid first to play a preliminary isolation and diversion role, and then plain concrete is poured on it to form a smooth and flat surface. Such double protection can not only effectively prevent rainwater accumulation, but also reduce the impact of solar radiation on the storage tank, extending the service life. In order to further ensure that rainwater can flow smoothly to the surroundings and avoid water accumulation, the two sides of the prefabricated vaults 3 at the edge are designed to be tilted outward to form a 100:1 water dispersion slope, which is not only conducive to drainage, but also helps the natural outflow of snow water after melting, avoiding the danger of ice accumulation on the top of the storage tank in freezing weather.

[0041] In addition, an elastic gasket is arranged between the basin-type support 7 and the liquefied hydrocarbon storage tank body 1, which can effectively absorb and alleviate the stress caused by the thermal expansion and contraction of the storage tank caused by temperature changes. At the same time, in sudden situations such as earthquakes, the elastic gasket can also play a shock-absorbing role, thereby improving the seismic resistance of the storage tank and protecting the storage tank from damage.

[0042] The basin support 7 is equipped with a temperature sensing element for real-time monitoring of the thermal expansion and contraction of the storage tank, and timely making corresponding adjustments to reduce the stress of the storage tank. The temperature sensing element is usually made of high-tech materials such as thermal resistors (RTDs), thermocouples or semiconductor temperature sensors. It is embedded in the basin support 7 or in a key position close to the basin support 7 to ensure that the changes in the ambient temperature around the storage tank can be accurately sensed. The temperature sensing element continuously collects data wirelessly or wired and transmits it to the central monitoring system. When the system detects that the temperature change exceeds the preset range, it automatically triggers the adjustment mechanism. For example, temperature rise will cause the storage tank to expand. At this time, the structural design of the basin support 7 allows a certain degree of free extension to compensate for the volume change, and vice versa. The central system analyzes the temperature trend, predicts the thermal expansion and contraction of the storage tank in advance, issues early warnings in a timely manner, and guides the operator to adjust the storage conditions, such as the injection or discharge of coolant, to ensure that the storage tank is in the most suitable temperature control environment.

[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquefied hydrocarbon storage tank system covered by a prefabricated cavern, characterized in that: It includes a liquefied hydrocarbon storage tank body, a prefabricated concrete cavern, a storage tank body support, a basin support and a fire sprinkler system; among which: The liquefied hydrocarbon storage tank body is connected to the bottom foundation of the prefabricated concrete cavity through the storage tank body support. The prefabricated concrete cavity surrounds the storage tank to form a closed protective shell, and a certain distance is maintained between the liquefied hydrocarbon storage tank body and the prefabricated concrete cavity; The pot-type support is arranged between the liquefied hydrocarbon storage tank support and the base on the bottom foundation to provide the storage tank with the ability to move laterally, allowing the storage tank to move freely during thermal expansion and contraction; The fire sprinkler system is evenly arranged on the inner side of the prefabricated concrete cavity, and the nozzle of the fire sprinkler system is aimed at the center of the liquefied hydrocarbon storage tank body and covers the liquefied hydrocarbon storage tank body; The liquefied hydrocarbon tank area includes a plurality of liquefied hydrocarbon storage tank bodies, each of which is independently enclosed in an independent prefabricated cavern.

2. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 1, characterized in that: Combustible gas detectors are arranged in sub-areas inside the prefabricated concrete cavity to detect leaking gas in time.

3. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 1, characterized in that: Both ends of the prefabricated concrete cavity are sealed with refractory brick walls, and only a door for people to enter and exit is reserved on the ground, using refractory materials.

4. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 1, characterized in that: The external reinforcement of the liquefied hydrocarbon storage tank body adopts a cross arrangement of double ring ribs and single ring ribs.

5. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 1, characterized in that: The prefabricated concrete cavity comprises a prefabricated vault and a prefabricated plate, the lower end of the prefabricated plate is fixedly connected to the bottom foundation, and the prefabricated vault is arranged on the prefabricated plate.

6. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 5, characterized in that: The connection between the prefabricated panel and the bottom foundation adopts high-strength anchoring pieces.

7. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 5, characterized in that: The joints between the prefabricated vault and the prefabricated panels are cast on site to form seamless joints, thereby improving the stability of the overall structure.

8. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 5, characterized in that: A sand and gravel filling layer is arranged between the prefabricated vaults, and then the upper surface is poured with plain concrete.

9. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 8, characterized in that: The prefabricated arch as a whole forms a drainage slope of 100:1 to avoid rainwater accumulation.

10. The liquefied hydrocarbon storage tank system covered by a prefabricated cavern according to claim 1, characterized in that: An elastic gasket is arranged between the pot-type support and the liquefied hydrocarbon storage tank body to further alleviate the stress caused by temperature changes in the storage tank and improve the seismic resistance of the storage tank.

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