A full liquid contact skin bag expansion and contraction type inner top floating disc device for storage tank

Abstract

A fully liquid-contact bladder-type internal roof floating roof device for storage tanks includes a storage tank with an inflatable bladder installed inside. The top of the tank is equipped with a gas filling / discharging pipe for the bladder, a first air discharge pipe, and a second air discharge pipe. A weighing sensor is installed at the bottom of the tank. Oil discharge pipes, a first control valve, an oil inlet pipe, and a second control valve are respectively located on the left and right sides below the tank. A hollow float plate is also installed inside the tank, with a gap between the hollow float plate and the tank wall. For the external piping, a gas source is connected to the gas filling / discharging pipe for the bladder via a first cumulative flow meter and a third check valve. Simultaneously, the gas filling / discharging pipe for the inflatable bladder is connected to the exhaust port via an electrically controlled ball valve and a second cumulative flow meter. The first and second air discharge pipes are connected to the exhaust port via a first and a second check valve, respectively. The first and second cumulative flow meters, the gas source, the weighing sensor, and the electrically controlled ball valve are all electrically connected to a computer control system. By replacing the internal floating roof seal with a bladder seal, the structure is simplified and the sealing effect is improved.

Description

Technical Field

[0001] This invention relates to the technical field of floating roofs for storage tanks, and particularly to a fully liquid-contact bladder-type internal roof floating roof device for storage tanks. Background Technology

[0002] Storage tanks are containers used to store media such as gases, liquefied gases, and liquids. Based on the material, storage tanks can be broadly classified into: polyethylene storage tanks, polypropylene storage tanks, fiberglass storage tanks, ceramic storage tanks, rubber storage tanks, and stainless steel storage tanks. In terms of cost-effectiveness, steel-lined polyethylene storage tanks are currently the most superior, possessing excellent corrosion resistance, high strength, and long service life. After storing the media, to reduce the loss of internal oil, gas, liquid, and chemical media and lower the risk of explosion, it is necessary to prevent the oil inside the tank from contacting air. Therefore, internal floating roofs are generally installed inside the tank to achieve the effect of isolating the oil from air.

[0003] Existing internal floating roofs require a complex sealing structure, making them prone to wear and increasing manufacturing and maintenance costs. Furthermore, the existing sealing structure is susceptible to jamming and flipping during use, failing to achieve the designed sealing performance. Additionally, the existing C-shaped seals are prone to partial flipping during vertical movement. The tank wall surface is not entirely smooth; it may contain weld slag, weld scars, or protrusions. When the seals encounter these defects during vertical movement, they can flip, easily detaching from the tank wall and failing to achieve the theoretical sealing effect. Sometimes, during vertical movement, the sealing end of the seal may be partially downward and partially upward, creating a twist and resulting in gaps and leakage. Although the seals have elastic support, they are also susceptible to bending and deformation due to gravity, reducing the sealing effect. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide a fully liquid-contact bladder-type internal roof floating roof device for storage tanks. By replacing the internal floating roof seal with an inflatable bladder seal, the structure is simplified and the sealing effect is improved.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fully liquid-contact bladder-type internal roof floating roof device for storage tanks includes a storage tank 1. An inflatable bladder 2 is installed inside the storage tank 1. The top of the storage tank 1 is equipped with a gas filling / discharging pipe 3, a first air discharge pipe 4-1, and a second air discharge pipe 4-2. A weighing sensor 5 is installed at the bottom of the storage tank 1. Oil discharge pipes 6, a first control valve 7-1, an oil inlet pipe 8, and a second control valve 7-2 are respectively located on the left and right sides below the storage tank 1. A hollow float 9 is also installed inside the storage tank 1. A gas source 10 is connected to the gas filling / discharging pipe 3 inside the bladder via a first cumulative flow meter 11-1 and a third check valve 12-3. Simultaneously, the gas filling / discharging pipe 3 inside the bladder is connected to an exhaust port 14 via an electrically controlled ball valve 13 and the second cumulative flow meter 11-2. The first air discharge pipe 4-1 and the second air discharge pipe 4-2 are connected to the exhaust port 14 via the first check valve 12-1 and the second check valve 12-2, respectively. In addition, the first cumulative flow meter 11-1, the second cumulative flow meter 11-2, the air source 10, the weighing sensor 5, and the electrically controlled ball valve 13 are all electrically connected to the computer 15.

[0007] The hollow float 9 is composed of multiple buoyancy units 19 obtained by a composite connection of an upper cover plate 16, a lower cover plate 17, and partitions 18 through a "riveting and welding" method. The two partitions 18 are first riveted together by rivets 20. Then, the two partitions 18 fixedly connected by rivets 20 are connected to the upper cover plate 16 by friction stir welding, forming a solid metallurgical connection weld point 21. The two partitions 18 fixedly connected by rivets 20 are connected to the lower cover plate 17 by friction stir welding, also forming a solid metallurgical connection weld point 21, thus finally obtaining the hollow float 9.

[0008] Compared with the prior art, the present invention provides a fully liquid-contact bladder-type internal roof floating roof device for storage tanks, the specific beneficial effects of which are as follows:

[0009] (1) Compared with the traditional tank floating structure, the tank full liquid contact bladder expansion and contraction internal roof floating device provided by the present invention has a simpler overall structure and a simpler operation process.

[0010] (2) The present invention provides a fully liquid-contact bladder-type internal roof floating device for storage tanks, which mainly adopts a "pneumatic bladder 2 + hollow float 9" structure. During the flushing process of the storage tank, the hollow float 9 can provide a large buoyancy, causing the pneumatic bladder 2 to undergo flexible deformation, squeezing out the oil or a small amount of "oil gas" present in the oil. Of course, even if there is a "large amount of oil gas", it will be discharged through the first air discharge pipe 4-1 and the second air discharge pipe 4-2, respectively, through the first one-way valve 12-1 and the second one-way valve 12-2, and then through the exhaust port 14. Therefore, the present invention can realize the "full liquid contact" mode of the floating plate during the flushing process of the storage tank. Therefore, the sealing effect of the entire storage tank is better.

[0011] (3) The main manufacturing method of the "hollow floating plate 9" used in this invention is achieved through two solid-state connection processes: "riveting and friction stir welding". The hollow floating plate 9 is divided into multiple small hollow units. Even if one hollow unit leaks, the other hollow units will not have problems. Of course, since the two solid-state connection processes of "riveting and friction stir welding" will have cracks in the connected plates, its sealing performance is very good and can prevent leakage. In addition, the processing and manufacturing process of the hollow floating plate 9 is efficient and low-cost, and its mechanical structure has good mechanical properties and excellent stability. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the present invention. In the diagram, the dashed lines represent electrical connections, and the cross-line areas represent the skin.

[0013] Figure 2 This is a partial cross-sectional view of the hollow floating plate 9.

[0014] Figure 3 This is a state diagram of the present invention before it is filled with oil. The dotted lines in the diagram represent electrical connections, and the cross lines represent the skin bladder.

[0015] Figure 4 This is a diagram showing the state after the oil filling of this invention is completed. The dotted lines in the diagram represent electrical connections, and the cross lines represent the skin bladder. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Reference Figure 1 A fully liquid-contact bladder-type internal roof floating roof device for storage tanks includes a storage tank 1. An inflatable bladder 2 is installed inside the storage tank 1. The top of the storage tank 1 is equipped with a gas filling / discharging pipe 3, a first air discharge pipe 4-1, and a second air discharge pipe 4-2. A weighing sensor 5 is installed at the bottom of the storage tank 1. Oil discharge pipes 6, a first control valve 7-1, an oil inlet pipe 8, and a second control valve 7-2 are respectively located on the left and right sides below the storage tank 1. A hollow float 9 is also installed inside the storage tank 1. A gas source 10 is connected to the gas filling / discharging pipe 3 inside the bladder via a first cumulative flow meter 11-1 and a third one-way valve 12-3. Simultaneously, the gas filling / discharging pipe 3 inside the bladder is connected to an exhaust port 14 via an electrically controlled ball valve 13 and the second cumulative flow meter 11-2. The first air discharge pipe 4-1 and the second air discharge pipe 4-2 are connected to the exhaust port 14 via the first one-way valve 12-1 and the second one-way valve 12-2, respectively. In addition, the first cumulative flow meter 11-1, the second cumulative flow meter 11-2, the air source 10, the weighing sensor 5, and the electrically controlled ball valve 13 are all electrically connected to the computer 15.

[0018] Reference Figure 2The hollow float 9 is composed of multiple buoyancy units 19 obtained by a composite connection of an upper cover plate 16, a lower cover plate 17, and partition plates 18 through a "riveting and welding" method. The two partition plates 18 are first riveted together by rivets 20. Then, the two partition plates 18 fixedly connected by rivets 20 are connected to the upper cover plate 16 by friction stir welding, forming a solid-state metallurgical connection weld point 21. The two partition plates 18 fixedly connected by rivets 20 are connected to the lower cover plate 17 by friction stir welding, also forming a solid-state metallurgical connection weld point 21, thus finally obtaining the hollow float 9.

[0019] The working principle of this invention is as follows:

[0020] Reference Figure 3 and Figure 4 As shown, the state of storage tank 1 before it is filled with oil is as follows: Figure 3 As shown, the computer control system 15 controls the opening of the gas source 10. The gas supplied by the gas source 10 passes through the first cumulative flow meter 11-1, the third one-way valve 12-3, and the gas filling / discharging pipe 3 inside the bladder before being filled into the inflatable bladder 2. This causes the inflatable bladder 2 to gradually expand and fill the entire internal space of the storage tank 1. At the same time, excess air inside the storage tank 1 is discharged through the first air discharge pipe 4-1 and the second air discharge pipe 4-2, respectively, through the first one-way valve 12-1 and the second one-way valve 12-2, and then through the exhaust port 14. Ultimately, the air inside the storage tank 1 is completely discharged by the expansion and compression of the inflatable bladder 2, ensuring a sealing effect.

[0021] During the oil filling process, the second control valve 7-2 opens, and the oil enters the storage tank 1 through the pipe 8. The weight of the oil being filled is monitored in real time by the weighing sensor 5 installed at the bottom of the storage tank 1, and the data is fed back to the computer control system 15. The computer control system 15 converts the weight of the oil into its volume, thus determining the volume of gas to be discharged from the inflatable bladder 2, thereby achieving real-time sealing of the oil in the storage tank 1. At this time, the computer control system 15 controls the ball valve 13 to open, allowing the gas inside the inflatable bladder 2 to be discharged through the gas filling / discharging pipe 3, the ball valve 13, the second cumulative flow meter 11-2, and the exhaust port 14. The third one-way valve 12-3 prevents gas from flowing back to the gas source 10. The volume of the discharged gas is monitored in real time by the second cumulative flow meter 11-2 and fed back to the computer control system 15. When the volume of the discharged gas reaches the required volume, the computer control system 15 controls the ball valve 13 to close.

[0022] The state at the end of oil filling is as follows Figure 4 As shown, the hollow float 9, under the action of the buoyancy of the oil, presses the inflatable bladder 2 in real time, so that the upper surface of the inflatable bladder 2 is always in close contact with the tank wall of the storage tank 1, thereby preventing air from entering and thus achieving a "full liquid contact" seal for the oil in the storage tank 1.

[0023] During the oil discharge process, the first control valve 7-1 opens, and the oil is discharged from the storage tank 1 through the oil discharge pipe 6. The weight of the discharged oil is monitored in real time by the weighing sensor 5 installed at the bottom of the storage tank 1 and fed back to the computer control system 15. The computer control system 15 converts the weight of the discharged oil into its volume, thus determining the volume of gas to be filled into the inflatable bladder 2. Simultaneously, the computer control system 15 controls the gas source 10 to open, allowing gas to flow through the first cumulative flow meter 11-1, the third one-way valve 12-3, and the gas filling / discharging pipe 3 into the inflatable bladder 2, causing it to inflate. The volume of gas filled is monitored in real time by the first cumulative flow meter 11-1 and fed back to the computer control system 15. When the required gas volume is reached, the computer control system 15 controls the gas source 10 to close, thereby achieving real-time sealing of the oil in the storage tank 1.

Claims

1. A fully liquid-contact bladder-type internal roof floating roof device for storage tanks, characterized in that: The system includes a storage tank (1) and a gas source (10). The storage tank (1) is equipped with an inflatable bladder (2). The top of the storage tank (1) is provided with a gas filling / discharging pipe (3), a first air discharge pipe (4-1), and a second air discharge pipe (4-2). A weighing sensor (5) is installed at the bottom of the storage tank (1). The left and right sides below the storage tank (1) are respectively provided with an oil discharge pipe (6), a first control valve (7-1), an oil inlet pipe (8), and a second control valve (7-2). A hollow float plate (9) is also installed inside the storage tank (1). The gas source (10) is connected to the gas source via a first cumulative flow meter (11-1) and a third check valve (1). 2-3) Connected to the gas filling / discharging tube (3) inside the bladder; at the same time, the gas filling / discharging tube (3) inside the bladder is connected to the exhaust port (14) through the electric ball valve (13) and the second cumulative flow meter (11-2); the first air exhaust tube (4-1) and the second air exhaust tube (4-2) are respectively connected to the exhaust port (14) through the first check valve (12-1) and the second check valve (12-2); in addition, the first cumulative flow meter (11-1), the second cumulative flow meter (11-2), the gas source (10), the weighing sensor (5), and the electric ball valve (13) are all connected to the computer (15); The hollow float (9) is composed of multiple buoyancy units (19) obtained by a composite connection of an upper cover plate (16), a lower cover plate (17) and a partition plate (18) through "riveting and welding". The two partition plates (18) are first riveted together by rivets (20). Then, the two partition plates (18) fixedly connected by the rivets (20) are connected to the upper cover plate (16) by friction stir welding, forming a solid metallurgical connection weld (21). The two partition plates (18) fixedly connected by the rivets (20) are connected to the lower cover plate (17) by friction stir welding, also forming the solid metallurgical connection weld (21), and finally the hollow float (9) is obtained.

2. The fully liquid-contact bladder-type internal roof floating roof device for storage tanks according to claim 1, characterized in that: Before the storage tank (1) is filled with oil, the gas source (10) is opened by the computer (15). The gas provided by the gas source (10) is filled into the inflatable bladder (2) through the first cumulative flow meter (11-1), the third one-way valve (12-3), and the gas filling / discharging pipe (3) in the bladder, so that the inflatable bladder (2) gradually expands and gradually fills the entire internal space of the storage tank (1). At the same time, the excess air inside the storage tank (1) will be discharged through the exhaust port (14) through the first air discharge pipe (4-1) and the second air discharge pipe (4-2) respectively through the first one-way valve (12-1) and the second one-way valve (12-2), so that the air inside the storage tank (1) is completely discharged by the expansion and compression of the inflatable bladder (2) to ensure the sealing effect.

3. The fully liquid-contact bladder-type internal roof floating roof device for storage tanks according to claim 1, characterized in that: During the filling process, the second control valve (7-2) is opened, and the oil enters the storage tank (1) through the oil inlet pipe (8); the weight of the filled oil is detected in real time by the weighing sensor (5) installed at the bottom of the storage tank (1), and fed back to the computer (15); the computer (15) converts the weight of the filled oil into the volume of the oil, and thus obtains the volume of gas that should be discharged from the inflatable bladder (2), thereby achieving real-time sealing of the oil in the storage tank (1); at this time, the computer (15) controls the electric ball valve ( 13) Open the air in the inflatable bladder (2) so that the gas inside the bladder passes through the gas filling / discharging tube (3), the electrically controlled ball valve (13), the second cumulative flow meter (11-2), and the exhaust port (14) before being discharged; the third one-way valve (12-3) prevents the gas from flowing back to the gas source (10); the volume of the discharged gas is monitored in real time by the second cumulative flow meter (11-2) and fed back to the computer (15). When the volume of the discharged gas reaches the required volume of the discharged gas, the computer (15) controls the electrically controlled ball valve (13) to close.

4. The fully liquid-contact bladder-type internal roof floating roof device for storage tanks according to claim 1, characterized in that: When the filling is finished, the hollow float (9) presses the inflatable bladder (2) in real time under the action of the buoyancy of the oil, so that the upper surface of the inflatable bladder (2) is always in close contact with the tank wall of the storage tank (1), thereby preventing air from entering and thus achieving a "full liquid contact" seal for the oil in the storage tank (1).

5. The fully liquid-contact bladder-type internal roof floating roof device for storage tanks according to claim 1, characterized in that: During the oil discharge process, the first control valve (7-1) is opened, and the oil is discharged from the storage tank (1) through the oil discharge pipe (6). The weight of the discharged oil is detected in real time by the weighing sensor (5) installed at the bottom of the storage tank (1), and fed back to the computer (15). The computer (15) converts the weight of the discharged oil into the volume of the oil, and thus obtains the volume of gas that should be filled into the inflatable bladder (2). At the same time, the computer (15) controls the gas source (10) to open, so that the gas passes through the... The first cumulative flow meter (11-1), the third one-way valve (12-3), and the gas filling / discharging pipe (3) of the bladder are used to fill the inflatable bladder (2) so that the inflatable bladder (2) expands. The volume of the gas filled is monitored in real time by the first cumulative flow meter (11-1) and fed back to the computer (15). When the volume of the gas filled reaches the required volume, the computer (15) controls the gas source (10) to be shut off, thereby achieving real-time sealing of the oil in the storage tank (1).

Images