Floating sealing structure of liquid storage tank

Abstract

The invention discloses a floating sealing structure of a liquid storage tank, and relates to the technical field of storage tank sealing, the floating sealing structure comprises a floating disc, the floating disc comprises a central floating body and a floating ring, and the central floating body is circular; the floating ring is annular, and the inner diameter of the floating ring is equal to the diameter of the central floating body; the floating ring comprises a plurality of floating cabins evenly distributed in the circumferential direction of the floating ring, one end of each floating cabin is located on the inner ring of the floating ring, and the other end of each floating cabin is located on the outer ring of the floating ring. The floating ring is sleeved on the central floating body, and one end of each floating cabin, which is positioned on the inner ring of the floating ring, is hermetically connected with the edge of the central floating body; the top ends of the first supporting legs are fixedly connected with the central floating body; the top ends of the second supporting legs are fixedly connected with the outer edge of the floating ring. According to the floating disc, the floating rings are formed by the floating cabins which are distributed in the circumferential direction, so that when the floating rings are subjected to external force, the stress can be more uniformly dispersed, local stress concentration is reduced, the overall strength of the floating disc is improved, and the floating disc can bear large external force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tank sealing, in particular to a floating sealing structure of a liquid storage tank. BACKGROUND

[0002] The inner floating disc, as a liquid level covering device of a storage tank, is widely used in the fields of petroleum, chemical industry, energy and the like. Its core function is to reduce the volatile loss of medium by covering the liquid level and to improve the operation safety of the storage tank. With the strict limitation of VOCs emission by the increasingly stringent global environmental protection regulations and the trend of large-scale storage tanks, the technical limitations of the traditional inner floating disc are increasingly highlighted.

[0003] The storage tank body, as a main finished product storage facility in the petroleum and chemical industry, stores liquid hydrocarbon products such as crude oil and finished oil, and the operation safety becomes the core focus of the industry. The floating disc, as a device for preventing oil evaporation of the oil tank storage facility, separates the air in the tank body from the stored medium by the floating disc made of aluminum alloy, carbon steel or stainless steel, and prevents and reduces the contact between the medium and the air by physical isolation, thereby reducing the gas phase space above the liquid level and reducing the evaporation loss of oil. However, the floating disc equipment with various materials and structures in actual operation has different degrees of deficiencies, and there are many shortcomings in stability, safety and strength. For example, the floating disc of the floating cylinder type uses discrete cylindrical floats as the core buoyancy unit. However, this structure has many risks: (1) Local loss of buoyancy; a single float may have defects in welding during manufacturing, causing the weld to leak, resulting in the whole float being immersed in the medium and thus failing. At this time, the buoyancy of the surrounding 3-5 square meters of the area will suddenly decrease, and the disc may be easily offset in a large-diameter storage tank. (2) Poor adaptability to large storage tanks; when the diameter is greater than 40 meters, the arrangement of the floats cannot avoid the difference in buoyancy between the edge and the center, causing the floating disc to be stuck and offset. (3) Excessive VOCs emission; there is a gap between the floats, forming an oil and gas space of 0.8-1.2 cubic meters per square meter, and the actual measured VOCs emission is 2.5-3.5 kg / (m 2 .a), which is much higher than the national standard.

[0004] The full-liquid tank type floating disc uses a continuous floating box, a rigid beam body and a fully enclosed panel to achieve the sealing effect of full liquid, which will cause a sharp increase in material consumption and have a significant impact on the load-bearing capacity of the storage tank foundation. The self-weight of the floating disc is too large, which reduces the effective buoyancy. When the density of the medium in the tank fluctuates greatly, the risk of insufficient buoyancy is easily caused. The floating disc is arranged in a triangular shape on the plane of the whole disc box, and the buoyancy is uniform. However, the self-weight of the multiple seals and the friction of the tank wall cause the floating disc to sag when it rises, which easily causes the floating disc to be stuck and sink.

[0005] In summary, the existing floating disc structure has many deficiencies. The floating disc body structure design has problems, and the force distribution is uneven when the medium enters and exits, which causes the floating disc to swing greatly and has poor stability, seriously affecting the normal operation of the running equipment. The connection mode of some floating disc structures is unreasonable, the structural strength and rigidity are insufficient, and the floating disc is prone to tilt and jam. SUMMARY

[0006] The purpose of the present application is to provide a liquid storage tank floating sealing structure to solve the problems existing in the prior art and improve the stability of the liquid storage tank sealing.

[0007] To achieve the above purpose, the present application provides the following scheme: The present application provides a liquid storage tank floating sealing structure, comprising: A floating disc, the floating disc comprises a center floating body and a floating ring, the center floating body is circular; the floating ring is annular and the inner diameter of the floating ring is equal to the diameter of the center floating body; the floating ring comprises a plurality of floating cabins uniformly distributed along the circumference of the floating ring, each floating cabin has one end located at the inner circle of the floating ring and the other end located at the outer circle of the floating ring; the floating ring is sleeved on the center floating body, and one end of each floating cabin located at the inner circle of the floating ring is sealingly connected with the edge of the center floating body; A plurality of first support legs, the top end of the first support leg is fixedly connected with the center floating body; A plurality of second support legs, the top end of the second support leg is fixedly connected with the outer edge of the floating ring.

[0008] Preferably, the top surface and the bottom surface of the floating cabin are both fan ring-shaped, the two side surfaces of the floating cabin spaced apart along the radial direction of the floating ring are both circular arc surfaces, and the two side surfaces of the floating cabin spaced apart along the circumferential direction of the floating ring are both rectangular end surfaces.

[0009] Preferably, a filling material is arranged in each floating cabin, and the filling material is polyurethane foaming material, aluminum honeycomb plate or support truss.

[0010] Preferably, the center floating body comprises a support frame, an upper sealing plate and a lower sealing plate, the upper sealing plate is fixedly laid on the top surface of the support frame, the lower sealing plate is fixedly laid on the bottom surface of the support frame, and the edges of the upper sealing plate and the lower sealing plate are sealingly connected with each floating cabin.

[0011] Preferably, the support frame comprises a plurality of main beams and a plurality of auxiliary beams arranged parallel and spaced apart, the main beams and the auxiliary beams are perpendicular to each other, and the main beams and the auxiliary beams are perpendicular to the axial direction of the center floating body; the main beams and the auxiliary beams are fixedly connected at the intersection.

[0012] Preferably, the edge of the upper sealing plate is sealed to each of the floats via a first connecting cylinder. The first connecting cylinder includes a first ring parallel to the upper sealing plate and a second ring perpendicular to the upper sealing plate. The outer edge of the first ring is sealed to the bottom end of the second ring. The first ring is fixedly connected to the upper sealing plate, and the second ring is sealed to each of the floats.

[0013] Preferably, the edge of the lower sealing plate is sealed to each of the floats via a second connecting cylinder. The second connecting cylinder includes a third ring parallel to the lower sealing plate and a fourth ring perpendicular to the lower sealing plate. The outer edge of the third ring is sealed to the top of the fourth ring. The third ring is fixedly connected to the lower sealing plate, and the fourth ring is sealed to each of the floats.

[0014] Preferably, both the upper sealing plate and the lower sealing plate are made of stainless steel.

[0015] Preferably, it further includes a protective cylinder fixedly sleeved on the float ring, with one end of each float located on the outer ring of the float ring being fixedly connected to the inner wall of the protective cylinder; the top end of the protective cylinder is also fixedly provided with an upper annular end plate located above the float ring, and the bottom end of the protective cylinder is fixedly provided with a lower annular end plate located below the float ring; the top end of the second support leg is fixedly provided with a connecting plate, the connecting plate being used to fixally connect with the protective cylinder, and the top end of the second support leg also abuts against the bottom end of the protective cylinder.

[0016] Preferably, a support top plate is fixedly provided at the top of the first support leg, and the support top plate is used to be fixedly connected to the bottom surface of the central floating body.

[0017] The present invention achieves the following technical effects compared to the prior art: The floating sealing structure for liquid storage tanks of this invention employs multiple circumferentially arranged floating chambers to form a floating ring. This allows the floating ring to distribute external forces more evenly, reducing localized stress concentration and thus improving the overall strength of the floating plate, enabling it to withstand greater external forces. The support frame in the central floating body includes cross-braced main beams and secondary beams, with the upper and lower sealing plates welded to the support frame. This forms a rigid frame structure for the central floating body, effectively enhancing the overall rigidity of the floating device and reducing deformation during use. By using multiple circumferentially arranged floating chambers to form the floating ring, combined with the addition of first and second support legs, the overall structure maintains good stability in environments such as liquid surfaces. It is less prone to tilting or swaying. Due to the higher strength and rigidity of the floating sealing structure for liquid storage tanks, and its structural stability, the frequency of maintenance and replacement due to deformation and damage is reduced, thereby extending the service life of the floating device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the floating sealing structure for the liquid storage tank of the present invention. Figure One ; Figure 2 This is a schematic diagram of the floating sealing structure for the liquid storage tank of the present invention. Figure Two ; Figure 3 This is a schematic diagram of the floating sealing structure for the liquid storage tank of the present invention. Figure Three ; Figure 4 This is a schematic diagram of the floating tank structure in the floating sealing structure of the liquid storage tank of the present invention; Figure 5 This is a partial structural schematic diagram of the floating sealing structure for liquid storage tanks of the present invention; Figure 6 This is a schematic diagram of the structure of the first support leg in the floating sealing structure of the liquid storage tank of the present invention. Figure One ; Figure 7 This is a schematic diagram of the structure of the first support leg in the floating sealing structure of the liquid storage tank of the present invention. Figure Two ; Figure 8 This is a schematic diagram of the second support leg in the floating sealing structure of the liquid storage tank of the present invention. Figure One ; Figure 9This is a schematic diagram of the second support leg in the floating sealing structure of the liquid storage tank of the present invention. Figure Two ; Figure 10 This is a partial structural diagram of the central floating body in the floating sealing structure of the liquid storage tank of the present invention; In the diagram: 1. Floating hull; 101. Front baffle; 103. Filling material; 104. Rear baffle; 2. First support leg; 3. Second support leg; 4. Third support leg; 5. Support frame; 501. Main beam; 502. Sub-beam; 6. Central floating body; 7. Upper sealing plate; 8. Lower sealing plate; 9. First connecting cylinder; 10. Second connecting cylinder; 11. Protective cylinder; 12. Upper annular end plate; 13. Lower annular end plate; 14. Connecting plate; 15. Support top plate. Detailed Implementation

[0020] The technical solutions of the embodiments 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, and 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.

[0021] The purpose of this invention is to provide a floating sealing structure for liquid storage tanks to solve the problems existing in the prior art and improve the stability of liquid storage tank sealing.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 10 As shown, this embodiment provides a floating seal structure for a liquid storage tank, including: The floating roof comprises a central floating body 6 and a floating ring. The central floating body 6 is circular. The floating ring is annular, and its inner diameter is equal to that of the central floating body 6. The floating ring includes multiple buoyancy chambers 1 evenly distributed along its circumference. Each buoyancy chamber 1 has one end located on the inner ring of the floating ring and the other end located on the outer ring of the floating ring. The floating ring is fitted onto the central floating body 6, and the end of each buoyancy chamber 1 located on the inner ring of the floating ring is sealed to the edge of the central floating body 6. The buoyancy chamber 1 is both a sealing element for the surface of the sealed medium and a buoyancy element for the floating roof, ensuring the overall buoyancy of the floating sealing structure of the liquid storage tank. It can float on the surface of the medium in the storage tank, isolating the stored medium from contact with air and preventing the volatilization of oil and gas. Multiple first support legs 2, the top of the first support legs 2 being fixedly connected to the central floating body 6; Multiple second support legs 3, the top of the second support legs 3 being fixedly connected to the outer edge of the floating ring.

[0024] This embodiment employs a floating sealing structure for the liquid storage tank, with multiple circumferentially arranged floating chambers 1 forming a floating ring. This allows the floating ring to distribute external forces more evenly, reducing localized stress concentration and thus improving the overall strength of the floating roof, enabling it to withstand greater external forces. When the height of the medium inside the storage tank is lower than the height of the floating roof, the first support leg 2 and the second support leg 3 can support the floating roof, preventing it from falling to the ground and colliding with and damaging other components of the tank.

[0025] In the optional schemes of this embodiment, a third support leg 4 is more preferably connected to the middle of the bottom end of each floating pod 1.

[0026] In the optional schemes of this embodiment, it is more preferred that the top and bottom surfaces of the float 1 are fan-shaped, the two sides of the float 1 that are radially spaced along the float ring (where the side located in the inner ring of the float ring is the rear baffle 104 and the side located in the outer ring of the float ring is the front baffle 101) are both arc surfaces, and the two sides of the float 1 that are circumferentially spaced along the float ring are both rectangular end faces.

[0027] In the optional schemes of this embodiment, it is more preferred that each floating hull 1 is provided with filling material 103, which is polyurethane foam, aluminum honeycomb panel or supporting truss; the physical density of filling material 103 is greater than or equal to 30 kg per cubic meter, providing extra buoyancy, so that even if the weld of the floating hull is damaged due to corrosion or collision, it can still maintain a floating state with a buoyancy loss of less than 20%.

[0028] In the optional scheme of this embodiment, the more preferred one is that the central floating body 6 includes a support frame 5, an upper sealing plate 7 and a lower sealing plate 8. The upper sealing plate 7 is fixedly laid on the top surface of the support frame 5, and the lower sealing plate 8 is fixedly laid on the bottom surface of the support frame 5. The edges of the upper sealing plate 7 and the lower sealing plate 8 are sealed and connected to each floating pod 1. Specifically, the upper sealing plate 7 and the lower sealing plate 8 are respectively welded to the support frame 5 using argon arc welding to ensure welding quality and avoid defects such as porosity and cracks.

[0029] In the optional embodiments of this example, the preferred embodiment includes a plurality of parallel and spaced main beams 501 and a plurality of parallel and spaced secondary beams 502. The main beams 501 and secondary beams 502 are perpendicular to each other and are both perpendicular to the axis of the central floating body 6. The main beams 501 and secondary beams 502 are fixedly connected at their intersections, for example by welding or by bolts. Double-sided welding is used during welding. Alternatively, the main beams 501 and secondary beams 502 can be welded and fixed at their intersections first, and then bolts can be added to both sides of the weld to enhance the strength and stability of the connection. The main beams 501 and secondary beams 502 support each other, forming a more stable grid-like frame structure. Compared with beam connections in a single direction, this structure can more effectively distribute the load, significantly improve the strength and stiffness of the floating body structure, and enable the floating body to withstand greater weight. The support frame 5 can distribute the pressure on the floating plate and improve the overall resistance to deformation.

[0030] In the optional scheme of this embodiment, it is more preferred that the edge of the upper sealing plate 7 is sealed to each float 1 through the first connecting cylinder 9. The first connecting cylinder 9 includes a first ring parallel to the upper sealing plate 7 and a second ring perpendicular to the upper sealing plate 7. The outer edge of the first ring is sealed to the bottom end of the second ring. The first ring is fixedly connected to the upper sealing plate 7, and the second ring is sealed to each float 1.

[0031] In the optional scheme of this embodiment, it is more preferred that the edge of the lower sealing plate 8 is sealed to each float 1 through the second connecting cylinder 10. The second connecting cylinder 10 includes a third ring parallel to the lower sealing plate 8 and a fourth ring perpendicular to the lower sealing plate 8. The outer edge of the third ring is sealed to the top of the fourth ring. The third ring is fixedly connected to the lower sealing plate 8, and the fourth ring is sealed to each float 1.

[0032] In the optional schemes of this embodiment, it is more preferred that the upper sealing plate 7 and the lower sealing plate 8 are both made of stainless steel. Stainless steel plates have the characteristics of corrosion resistance and high strength. The welds between the upper sealing plate 7 and the lower sealing plate 8 and the main beam and the secondary beam 502, as well as between the stainless steel plates, must be fully welded to prevent liquid from entering and corroding the main and secondary beams 502. The upper sealing plate 7 and the lower sealing plate 8 are not only isolation elements that isolate the medium inside the tank from the central floating body 6, but also rigidity strengthening elements of the central floating body 6. The upper sealing plate 7 and the lower sealing plate 8 surround the support frame 5 inside, so that the support frame 5 is not corroded by the medium material and forms a rigid whole. Compared with the traditional welded frame, the sealing performance is improved by 90%, the service life of the components is extended to more than 20 years, and the loss of buoyancy caused by leakage can be avoided.

[0033] In the optional scheme of this embodiment, a more preferred option is to further include a protective cylinder 11 fixedly sleeved on the floating ring. One end of each float 1 located on the outer ring of the floating ring is fixedly connected to the inner wall of the protective cylinder 11. The top end of the protective cylinder 11 is also fixedly provided with an upper annular end plate 12 located above the floating ring, and the bottom end of the protective cylinder 11 is fixedly provided with a lower annular end plate 13 located below the floating ring. The protective cylinder 11 is the first sealing barrier between the floating roof and the inner wall of the storage tank. It can isolate the harsh environment inside the tank from the damage to the center of the floating roof, and can also minimize the gap between the edge of the floating roof and the inner wall of the storage tank, block the direct contact between the liquid surface and the gas phase space at the top of the tank, and reduce evaporation loss.

[0034] A connecting plate 14 is fixedly provided at the top of the second support leg 3. The connecting plate 14 is used to fix and connect with the protective cylinder 11. The top of the second support leg 3 also abuts against the bottom of the protective cylinder 11.

[0035] In the optional scheme of this embodiment, a more preferred embodiment is that a support top plate 15 is fixedly provided at the top of the first support leg 2. The support top plate 15 is used to be fixedly connected to the bottom surface of the central floating body 6. The support top plate 15 is provided with a connection hole, and the connection hole is fixedly connected to the bottom surface of the central floating body 6 by bolts.

[0036] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A floating sealing structure for a liquid storage tank, characterized in that, include: A floating platform, comprising a central floating body and a floating ring, wherein the central floating body is circular; the floating ring is annular and its inner diameter is equal to the diameter of the central floating body; the floating ring comprises a plurality of buoyancy chambers evenly distributed along the circumference of the floating ring, each buoyancy chamber having one end located on the inner ring of the floating ring and the other end located on the outer ring of the floating ring; the floating ring is fitted onto the central floating body, and the end of each buoyancy chamber located on the inner ring of the floating ring is sealed to the edge of the central floating body; Several first support legs, the top of which are fixedly connected to the central floating body; Several second support legs, the top of which is fixedly connected to the outer edge of the floating ring.

2. The floating sealing structure for liquid storage tanks according to claim 1, characterized in that: The top and bottom surfaces of the float are both fan-shaped, the two sides of the float that are radially spaced along the float ring are both arc surfaces, and the two sides of the float that are circumferentially spaced along the float ring are both rectangular end faces.

3. The floating sealing structure for liquid storage tanks according to claim 1, characterized in that: Each of the aforementioned buoys is provided with filling material, which may be polyurethane foam, aluminum honeycomb panels, or supporting trusses.

4. The floating sealing structure for liquid storage tanks according to claim 1, characterized in that: The central floating body includes a support frame, an upper sealing plate, and a lower sealing plate. The upper sealing plate is fixedly laid on the top surface of the support frame, and the lower sealing plate is fixedly laid on the bottom surface of the support frame. The edges of the upper sealing plate and the lower sealing plate are sealed to each of the floating pods.

5. The floating sealing structure for liquid storage tanks according to claim 4, characterized in that: The support frame includes multiple main beams and multiple secondary beams arranged in parallel and spaced apart. The main beams and the secondary beams are perpendicular to each other, and both the main beams and the secondary beams are perpendicular to the axis of the central floating body. The main beams and the secondary beams are fixedly connected at their intersections.

6. The floating sealing structure for liquid storage tanks according to claim 4, characterized in that: The edge of the upper sealing plate is sealed to each of the floats via a first connecting cylinder. The first connecting cylinder includes a first ring parallel to the upper sealing plate and a second ring perpendicular to the upper sealing plate. The outer edge of the first ring is sealed to the bottom end of the second ring. The first ring is fixedly connected to the upper sealing plate, and the second ring is sealed to each of the floats.

7. The floating sealing structure for liquid storage tanks according to claim 4, characterized in that: The edge of the lower sealing plate is sealed to each of the floats via a second connecting cylinder. The second connecting cylinder includes a third ring parallel to the lower sealing plate and a fourth ring perpendicular to the lower sealing plate. The outer edge of the third ring is sealed to the top of the fourth ring. The third ring is fixedly connected to the lower sealing plate, and the fourth ring is sealed to each of the floats.

8. The floating sealing structure for liquid storage tanks according to claim 4, characterized in that: Both the upper and lower sealing plates are made of stainless steel.

9. The floating sealing structure for liquid storage tanks according to claim 1, characterized in that: It also includes a protective cylinder fixedly sleeved on the floating ring, with one end of each float located on the outer ring of the floating ring being fixedly connected to the inner wall of the protective cylinder; the top end of the protective cylinder is also fixedly provided with an upper annular end plate located above the floating ring, and the bottom end of the protective cylinder is fixedly provided with a lower annular end plate located below the floating ring; the top end of the second support leg is fixedly provided with a connecting plate, which is used to fixally connect with the protective cylinder, and the top end of the second support leg also abuts against the bottom end of the protective cylinder.

10. The floating sealing structure for a liquid storage tank according to claim 1, characterized in that: A support plate is fixedly provided at the top of the first support leg, and the support plate is used to be fixedly connected to the bottom surface of the central floating body.

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