Liquid-filled oilless gas sealing system

Abstract

This utility model relates to a liquid-filled oil-free gas sealing system, comprising a primary seal and a secondary seal disposed between the floating roof and the tank wall of a storage tank, and a burst-suppressing membrane disposed between the primary and secondary seals. The primary seal includes an annular sling installed on the side of the floating roof and located between the floating roof and the tank wall; a liquid-filling pipe is disposed within the annular space between the sling and the floating roof; and a liquid-filling tube is disposed on the liquid-filling pipe. The secondary seal includes a pressure plate fixed at its lower end to the top of the outer ring of the floating roof; a sliding piece fixed at the upper end of the pressure plate and pressed against the tank wall by the elasticity of the pressure plate; and a barrier membrane disposed on the back of the pressure plate. The upper and lower ends of the burst-suppressing membrane are connected to the sliding piece and the side of the floating roof, respectively; the middle of the burst-suppressing membrane is kept parallel to the vertical tank wall by its own weight. This liquid-filled oil-free gas sealing system of the utility model has good sealing effect, low oil and gas loss, and good safety.

Description

Technical Field

[0001] This utility model relates to a liquid-filled oil-free gas-free sealing system, belonging to the field of oil tank sealing technology. Background Technology

[0002] When designing and constructing external floating roof tanks, in order to ensure that the floating roof can move up and down flexibly, a certain annular gap needs to be maintained between the outer edge of the floating roof and the tank wall plate. This annular gap is the necessary space for the floating roof to move up and down. This annular space is connected to the exposed oil surface inside the tank and is the main channel for the release of oil and gas. It is usually sealed with a sealing device to reduce the evaporation loss of oil and gas.

[0003] Currently, floating roof oil tank sealing devices generally adopt oil-free sealing systems, which include a two-stage sealing structure. The primary seal, used for direct sealing of the oil surface, is the most important sealing facility. To ensure better sealing performance, reduce oil and gas evaporation losses, and improve tank operation safety, a secondary seal is installed outside the primary seal to protect it. This further reduces oil and gas loss and minimizes oil and gas accumulation inside the sealing structure, thus improving tank operation safety. Existing oil-free sealing systems often use a packing-type elastic soft seal for the primary seal. However, when tank wall deformation is significant, the sealing effect is unsatisfactory, easily causing oil and gas to leak from the primary seal and accumulate between the primary and secondary seals. This results in significant oil and gas evaporation losses and can easily create safety hazards.

[0004] Therefore, there is an urgent need for an oil-free sealing system that offers good sealing performance, low oil and gas loss, and high safety. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an oil-free sealing system with good sealing effect, low oil and gas loss, and good safety, which can ensure the safe and stable operation of oil tanks.

[0006] The purpose of this utility model is achieved as follows:

[0007] The liquid-filled oilless gas sealing system includes a primary seal and a secondary seal installed between the floating roof and the tank wall of the storage tank, and an explosion suppression membrane installed between the primary seal and the secondary seal;

[0008] The primary seal includes an annular sling installed on the side of the floating roof and located between the floating roof and the tank wall. A filling pipe is provided in the annular space between the sling and the floating roof, and a filling tube is provided on the filling pipe. The lower end of the filling tube extends into the filling pipe body, the middle part is connected to the floating roof, and a filling valve is installed at the upper end.

[0009] The secondary seal includes a pressure plate fixed at the bottom of the outer ring of the floating roof, a sliding piece fixed at the top of the pressure plate and pressed against the tank wall by the elasticity of the pressure plate, and a barrier membrane set on the back of the pressure plate.

[0010] The upper and lower ends of the explosion suppression membrane are connected to the sliding plate and the side of the floating roof, respectively, and the middle part of the explosion suppression membrane is kept parallel to the vertical tank wall by its own weight.

[0011] Furthermore, the upper end of the sling and the lower end of the explosion-proof membrane are both fixed to the top side of the floating roof by L-shaped pressure plates and bolts; the lower end of the sling is fixed to the lower side of the floating roof by a lower pressure plate and bolts.

[0012] Furthermore, the filling tube is filled with saline solution with a volume percentage of 60% to 70%.

[0013] Furthermore, the outer surfaces of the sling and the explosion-proof membrane are provided with a toothed structure.

[0014] Furthermore, an electrostatic conductive sheet is installed on the sliding plate to slide in contact with the tank wall, thereby electrically connecting the floating roof and the tank wall.

[0015] Furthermore, the sling, filling tube, sliding plate, barrier membrane, and explosion-suppressing membrane are all made of polymer materials.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention uses a liquid-filled seal as the primary seal, which can adapt to large deformations of the tank wall, has a good sealing effect, and prevents oil and gas from overflowing. The secondary seal and the primary seal form a double seal, which enhances the effect of suppressing oil and gas volatilization and protects the primary seal, effectively extending its service life. An explosion-suppressing membrane is set between the primary and secondary seals, which prevents oil and gas from accumulating in large quantities, minimizes oil and gas loss, and ensures high safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the liquid-filled oil-free gas sealing system of this utility model.

[0019] Figure 2 This is a partial structural schematic diagram of the liquid-filled oil-free gas sealing system of this utility model.

[0020] Figure 3 This is a schematic diagram of the sliding plate structure of the liquid-filled oil-free gas sealing system of this utility model.

[0021] in:

[0022] Floating roof 1, tank wall 2, lifting strap 3, filling pipe body 4, filling pipe 5, filling valve 6, pressure plate 7, sliding plate 8, barrier membrane 9, explosion suppression membrane 10, L-shaped pressure plate 11, lower pressure plate 12, static electricity conductive plate 13. Detailed Implementation

[0023] See Figures 1-3The present invention relates to a liquid-filled oil-free gas sealing system, comprising a primary seal and a secondary seal disposed between the floating roof 1 and the tank wall 2 of the storage tank, and an explosion-suppressing membrane 10 disposed between the primary seal and the secondary seal.

[0024] The primary seal includes an annular sling 3 installed on the side of the floating roof 1 and located between the floating roof 1 and the tank wall 2. Specifically, the upper end of the sling 3 and the lower end of the explosion-proof membrane 10 are both fixed to the top side of the floating roof 1 by L-shaped pressure plates 11 and bolts, and the lower end of the sling 3 is fixed to the lower side of the floating roof 1 by lower pressure plates 12 and bolts. A filling pipe 4 is provided in the annular space between the sling 3 and the floating roof 1, and the filling pipe 4 is filled with brine with a volume percentage of 60% to 70%. A filling pipe 5 is provided on the filling pipe 4 for injecting or discharging brine into the filling pipe 4. The lower end of the filling pipe 5 extends into the filling pipe 4, the middle part is connected to the floating roof 1, and the upper end is equipped with a filling valve 6. The sling 3 and the filling pipe 4 are both made of polymer materials, preferably fluororubber, nitrile rubber, EPDM rubber, etc. The outer surface of the sling 3 is provided with a toothed structure to improve its wear resistance and sealing performance with the tank wall 2. The filling pipe 4, which is internally filled with brine, has good flexibility and deformation capacity, which can effectively fill the annular space of the storage tank to form a seal. The tank wall 2 has strong compensation capacity when deformed, large sealing contact area, good sealing effect, and prevents oil and gas leakage.

[0025] The secondary seal includes a pressure plate 7 fixed at its lower end to the top of the outer ring of the floating roof 1, a sliding piece 8 fixed at the upper end of the pressure plate 7 and pressed tightly against the tank wall 2 by the elasticity of the pressure plate 7, and a barrier membrane 9 disposed on the back of the pressure plate 7. The connection between the middle part of the filling pipe 5 and the floating roof 1, the barrier membrane 9 and the pressure plate 7 is fixed and sealed by a sealing element. The sliding piece 8 is equipped with a conductive sheet 13 that slides in contact with the tank wall 2, electrically connecting the floating roof 1 and the tank wall 2 to achieve equipotential between the floating roof 1 and the tank wall 2, eliminating static electricity generated during operation. The sliding piece 8 is a polymer material, preferably synthetic nitrile rubber, and the barrier membrane 9 is a polymer material, preferably fluororubber, nitrile rubber, EPDM rubber, etc. The secondary seal can effectively prevent rainwater from seeping into the tank, forming a double seal with the primary seal, enhancing the effect of inhibiting oil and gas volatilization, and protecting the primary seal, effectively extending the service life of the primary seal and improving operational safety.

[0026] The upper and lower ends of the explosion-suppressing membrane 10 are connected to the sides of the sliding plate 8 and the floating roof 1, respectively. The middle part of the explosion-suppressing membrane 10 relies on the counterweight of the toothed structure set on its surface to maintain parallelism with the vertical tank wall 2. In actual operation, multiple membranes can be bonded together with a special adhesive to form a single membrane covering the primary and secondary seals, with an overlap width of not less than 300 mm. A gap of 5-10 mm is left between the explosion-suppressing membrane 10 and the tank wall 2. The explosion-suppressing membrane 10 is made of polymer materials, such as nitrile rubber, fluororubber, chlorosulfonated polyethylene, etc. Its connection with the sliding plate 8 and the floating roof 1 shares the fastening position and fasteners with the primary and secondary seals. The explosion-suppressing membrane 10 and the barrier membrane 9 of the secondary seal form a sealed air pocket, reducing the oil and gas space between the primary and secondary seals, reducing the amount of oil and gas accumulation between the primary and secondary seals, reducing oil and gas loss and improving operational safety, effectively reducing the risk of flash explosion accidents in the sealing ring caused by open flames such as lightning strikes.

[0027] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A liquid-filled oil-free airtight sealing system, comprising a primary seal and a secondary seal arranged between a floating roof (1) and a tank wall (2), and a blast suppression membrane (10) arranged between the primary seal and the secondary seal, characterized in that: the primary seal comprises a ring-shaped hanger belt (3) mounted on the side of the floating roof (1) and located between the floating roof (1) and the tank wall (2), a liquid-filled pipe body (4) arranged in the annular space between the hanger belt (3) and the floating roof (1), and a liquid-filled pipe (5) arranged on the liquid-filled pipe body (4); the lower end of the liquid-filled pipe (5) extends into the liquid-filled pipe body (4), the middle part is connected with the floating roof (1), and the upper end is provided with a liquid-filled valve (6); the secondary seal comprises a pressure plate (7) fixed at the top of the outer ring of the floating roof (1), a sliding sheet (8) fixed at the upper end of the pressure plate (7) and tightly attached to the tank wall (2) by the elasticity of the pressure plate (7), and a barrier membrane (9) arranged on the back of the pressure plate (7); the upper and lower ends of the blast suppression membrane (10) are connected with the sliding sheet (8) and the side of the floating roof (1), respectively, and the middle part of the blast suppression membrane (10) is kept parallel to the vertical tank wall (2) by its own weight; the upper end of the hanger belt (3) and the lower end of the blast suppression membrane (10) are both fixed on the top of the side of the floating roof (1) through an L-shaped pressing plate (11) and bolts; the lower end of the hanger belt (3) is fixed on the lower part of the side of the floating roof (1) through a lower pressing plate (12) and bolts; the inside of the liquid-filled pipe body (4) is filled with 60%-70% of brine by volume; the outer surfaces of the hanger belt (3) and the blast suppression membrane (10) are provided with a tooth-shaped structure; the sliding sheet (8) is provided with a static conductive sheet (13) in sliding contact with the tank wall (2) and electrically connected with the floating roof (1) and the tank wall (2); the hanger belt (3), the liquid-filled pipe body (4), the sliding sheet (8), the barrier membrane (9), and the blast suppression membrane (10) are all made of a high polymer material. ​ ​ ​ 2. The liquid-filled, oil-free gas seal system of claim 1, wherein: ​ 3. The liquid-filled, oil-free gas seal system of claim 1, wherein: ​ 4. The liquid-filled, oil-free gas seal system of claim 1, wherein: ​ 5. The liquid-filled, oil-free gas seal system of claim 1, wherein: ​ 6. The liquid-filled, oil-free gas seal system of claim 1, wherein: ​

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