Normal-pressure storage tank floating roof guide column pipe inner and outer sealing device and normal-pressure storage tank

Abstract

The invention relates to the technical field of normal-pressure floating roof storage tank sealing, and provides a normal-pressure storage tank floating roof guide column pipe inner and outer sealing device and a normal-pressure storage tank. The sealing device comprises a floating disc and a guide column, a through hole is formed in the floating disc, the guide column penetrates through the through hole, a lower sealing plate is fixedly arranged on the upper surface of a floating roof, and a coaxial hole with the same diameter as the through hole is formed in the lower sealing plate; an upper sealing plate is arranged on the lower sealing plate in a sliding and sealing manner and is sealed with the guide columns; a buoy is arranged in the guide column, an upper butterfly-shaped leather cup is arranged at the upper end of the buoy, a lower butterfly-shaped leather cup is arranged at the lower end of the buoy, two oil passing holes are formed in the bent portion of the lower butterfly-shaped leather cup, a through screw is arranged in the buoy in a sealed mode, a rubber leather pipe is arranged in the through screw, a steel wire rope is arranged in the rubber leather pipe in a sealed and penetrating mode, and the lower end of the steel wire rope is connected with a suspension wire conical heavy hammer. The upper end of the steel wire rope is connected to the center of the sealing cover plate at the top of the guide post. The sealing device can effectively seal two leakage sources and can adapt to horizontal drifting of the floating roof.

Description

Technical Field

[0001] This application belongs to the technical field of atmospheric pressure floating roof storage tank sealing. More specifically, it relates to an internal and external sealing device for the guiding column pipe of the floating roof of an atmospheric pressure storage tank and an atmospheric pressure storage tank. Background Art

[0002] During the operation of an atmospheric pressure floating roof storage tank, in order to ensure that the floating roof (floating disc) rises and falls smoothly with the liquid level without deviation, a guiding device (guiding column or guiding steel wire rope; the floating roof guiding device of large storage tanks generally uses guiding columns) is provided. The guiding column vertically penetrates the floating roof to reach the bottom of the storage tank. In addition to restricting the horizontal drift of the floating roof, it also uses functions such as detecting the oil level, sampling inside the tank, and installing a radar level gauge with a flange through the guiding column.

[0003] In order to balance the pressure inside the guiding column with the pressure under the floating roof and make the oil products inside the pipe consistent with the oil products at the same height inside the tank, balance holes are opened axially on the guiding column. And because of the insertion fit formed between the through holes of the guiding column and the floating roof, there are inevitably gaps, and this gap is also the key point for preventing oil and gas volatilization and loss. Thus, there are two leakage sources at the place where the guiding column passes through the floating roof. One is the annular gap of the opening between the guiding column and the through hole of the floating roof, and the other is the oil surface inside the guiding column pipe. During the operation of existing atmospheric pressure storage tanks, most of them use fixed sealing packing to seal between the guiding column and the floating roof. The sealing effect is not good, and because there is a horizontal drift phenomenon when the floating roof rises and falls, the sealing packing cannot adapt to the horizontal drift of the floating roof and is severely worn, resulting in oil and gas leakage from the packing; currently, most measures have not been taken for the leakage of the oil surface inside the guiding column. At most, it is only required to cover the cover tightly after gauging and sampling. For the openings on the guiding column, if it is an internal floating roof tank, the oil and gas leak from the openings on the guiding column into the gas space between the floating roof and the arch roof, resulting in non-compliance of VOC at the discharge port of the tank top breathing valve. If it is an external floating roof tank, it is directly discharged into the atmosphere, causing pollution. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the purpose of the embodiment of this application is to provide an internal and external sealing device for the guiding column pipe of the floating roof of an atmospheric pressure storage tank, which can effectively seal two leakage sources and can adapt to the horizontal drift of the floating roof.

[0005] To achieve the above object, the technical solution adopted in this application is as follows: A floating roof guide post sealing device is provided, which includes a floating disc and a guide post. The floating disc is provided with a through hole, and the guide post passes through the through hole. The diameter of the through hole is larger than the diameter of the guide post. A lower sealing plate is fixedly provided on the upper surface of the floating disc. The lower sealing plate is provided with a coaxial hole having the same diameter as the through hole. An upper sealing plate is slidably and sealingly arranged on the lower sealing plate, and the upper sealing plate is sealed with the guide post. A floating cylinder is arranged inside the guide post. An upper butterfly leather cup is arranged at the upper end of the floating cylinder, and a lower butterfly leather cup is arranged at the lower end of the floating cylinder. Two oil passing holes are arranged on the bending part of the lower butterfly leather cup. A hollow screw rod is hermetically arranged inside the floating cylinder. A rubber hose is arranged inside the hollow screw rod. A steel wire rope is hermetically passed through the rubber hose. The lower end of the steel wire rope is connected with a suspension line conical weight, and the upper end of the steel wire rope is connected to the center of the sealing cover plate at the top of the guide post.

[0006] In one embodiment, a plurality of rectangular grooves surrounding the coaxial hole are formed on the upper surface of the lower sealing plate, and graphite strip packing is filled in the rectangular grooves.

[0007] In one embodiment, an annular sunk groove surrounding the guide post is formed on the upper surface of the upper sealing plate. Sealing packing is arranged in the annular sunk groove, and a packing gland for pressing the sealing packing is arranged on the upper sealing plate.

[0008] In one embodiment, both the upper sealing plate and the lower sealing plate are wooden plates. Both the upper sealing plate and the lower sealing plate are formed by splicing two half plates with semi-circular holes opened in the middle. The joint surfaces of the two half plates are coated with oil-resistant sealant. Installation holes are arranged on both sides of the two half plates at the semi-circular holes, and a double-headed bolt is passed through the installation holes to splice the two half plates into a whole.

[0009] In one embodiment, the side length of the upper sealing plate is larger than the side length of the lower sealing plate.

[0010] In one embodiment, the sealing and fixing between the lower sealing plate and the floating disc are achieved by bonding with oil-resistant sealant or using an oil-resistant rubber gasket plus self-tapping screws.

[0011] In one embodiment, nuts are screwed at both ends of the hollow screw rod. Both the bottom of the upper butterfly leather cup and the bottom of the lower butterfly leather cup are sleeved with leather cup gland through the hollow screw rod and are pressed tightly by the nuts.

[0012] In one embodiment, the floating cylinder, the leather cup gland and the hollow screw rod are all made of copper. An electrostatic conductive copper sheet is also fixed on the upper butterfly leather cup through a hollow screw rod and a nut.

[0013] In one embodiment, the static conductive copper sheet has a V-shaped structure, and both ends are bent into an arc shape, and the vertex of the arc contacts the inner wall of the guiding column.

[0014] In one embodiment, the upper butterfly leather cup, the lower butterfly leather cup and the rubber hose are all made of wear-resistant and oil-resistant rubber.

[0015] Another object of the present application is to provide an atmospheric storage tank, including: a tank body and the inner and outer sealing device of the floating roof guiding column pipe of the atmospheric storage tank as described above.

[0016] The beneficial effects of the inner and outer sealing device of the floating roof guiding column pipe of the atmospheric storage tank and the atmospheric storage tank provided by the present application are as follows:

[0017] 1. The upper sealing plate and the guiding column are taken as a whole, and the lower sealing plate and the floating disc are taken as a whole, so that the gap between the guiding column and the floating disc adopts the surface sealing of the upper sealing plate and the lower sealing plate, and the upper sealing plate can slide relative to the lower sealing plate, which can be applicable to the horizontal drift movement of the floating disc relative to the guiding column and ensure the sealing performance, thereby ensuring no leakage at the leakage source between the guiding column and the floating disc.

[0018] 2. The sealing inside the guiding column is carried out by combining a floating cylinder with upper and lower butterfly leather cups. The floating cylinder always floats on the oil surface inside the guiding column, and the upper and lower butterfly leather cups always press on the inner wall of the guiding column, ensuring no leakage at the leakage source inside the guiding column.

[0019] 3. The floating cylinder can ensure the sealing performance of the steel wire rope through the rubber hose inside the through-core screw, and the suspension line conical weight suspended by the steel wire rope can drive the floating cylinder to be pulled out of the guiding column upward, which is beneficial to the maintenance and sampling of the floating cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic cross-sectional plane structure diagram of the inner and outer sealing device of the floating roof guiding column pipe of the atmospheric storage tank provided by the embodiment of the present application;

[0022] Figure 2 It is a schematic installation structure diagram of the floating roof in the inner and outer sealing device of the floating roof guiding column pipe of the atmospheric storage tank provided by the embodiment of the present application;

[0023] Figure 3 It is a schematic splicing structure diagram of the lower sealing plate of the inner and outer sealing device of the floating roof guiding column pipe of the atmospheric storage tank provided by the embodiment of the present application.

[0024] Among them, each reference numeral in the figure:

[0025] 1. Floating disc; 11. Through hole; 2. Guide post; 21. Sealing cover plate; 3. Lower sealing plate; 31. Coaxial hole; 32. Rectangular groove; 33. Graphite strip packing; 34. Mounting hole; 35. Stud bolt; 4. Upper sealing plate; 41. Annular sink; 42. Sealing packing; 43. Packing gland; 44. Fastening screw; 5. Float; 51. Upper butterfly leather cup; 52. Lower butterfly leather cup; 521. Oil passing hole; 53. Leather cup gland; 6. Through-core screw; 61. Rubber hose; 62. Nut; 7. Steel wire rope; 71. Suspension line conical weight; 8. Static conductive copper sheet; 81. Arc shape. Detailed implementation manners

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus cannot be understood as a limitation to this application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0030] Such as Figures 1 - 3As shown in the figure, a device for inner and outer seals of a floating roof guiding column pipe in an atmospheric storage tank provided by an embodiment of the present application will be described. The device for inner and outer seals of the floating roof guiding column pipe in the atmospheric storage tank is arranged inside the tank body of the atmospheric storage tank. The device for inner and outer seals of the floating roof guiding column pipe in the atmospheric storage tank includes a floating disc 1 and a guiding column 2. A through hole 11 is provided on the floating disc 1. The guiding column 2 passes through the through hole 11. The diameter of the through hole 11 is larger than the diameter of the guiding column 2. The guiding column 2 is a hollow pipe. The floating disc 1 is arranged inside the tank body. A lower sealing plate 3 is fixedly provided on the upper surface of the floating disc 1. Specifically, the lower sealing plate 3 and the floating disc 1 are fixedly sealed by gluing with oil-resistant sealant or by using an oil-resistant rubber pad and self-tapping screws. A coaxial hole 31 with the same diameter as the through hole 11 is provided on the lower sealing plate 3, that is, the lower sealing plate 3 and the floating disc 1 move synchronously as a whole. An upper sealing plate 4 is slidably sealed on the lower sealing plate 3. The upper sealing plate 4 can slide horizontally relative to the lower sealing plate 3 and ensure a sealed state between the two. The upper sealing plate 4 is sealed with the guiding column 2, thereby realizing the seal between the floating disc 1 and the guiding column 2. Since the upper sealing plate 4 and the guiding column 2 are a whole, and the lower sealing plate 3 and the floating disc 1 are a whole, the gap between the guiding column 2 and the floating disc 1 is sealed by the surface of the upper sealing plate 4 and the lower sealing plate 3. Moreover, the upper sealing plate 4 can slide horizontally relative to the lower sealing plate 3, which can adapt to the horizontal drift movement of the floating disc 1 relative to the guiding column 2 and ensure the sealing performance, thereby ensuring no leakage at the leakage source between the guiding column 2 and the floating disc 1.

[0031] In this embodiment, a floating cylinder 5 is arranged inside the guiding column 2. The diameter of the floating cylinder 5 is smaller than the inner diameter of the guiding column 2, so that the floating cylinder 5 can rise and fall with the oil level in the guiding column 2. The floating cylinder 5 is a closed cylindrical structure. An upper butterfly leather cup 51 is provided at the upper end of the floating cylinder 5, and a lower butterfly leather cup 52 is provided at the lower end of the floating cylinder 5. Two oil passing holes 521 are provided on the bending part of the lower butterfly leather cup 52. The upper butterfly leather cup 51 is sealed and connected with the inner wall of the guiding column 2. The lower butterfly leather cup 52 is used to ensure the coaxiality of the floating cylinder 5. The oil passing holes 521 are used to discharge the oil when the floating cylinder 5 is lifted. Under normal conditions, the lower butterfly leather cup 52 is immersed in the oil. A through-core screw rod 6 is hermetically arranged inside the floating cylinder 5. Both ends of the through-core screw rod 6 extend out of both ends of the floating cylinder 5. A rubber hose 61 is arranged inside the through-core screw rod 6. A steel wire rope 7 is hermetically arranged inside the rubber hose 61. A hanging line conical weight 71 is connected to the lower end of the steel wire rope 7. The upper end of the steel wire rope 7 is connected to the center of the sealing cover plate 21 at the top of the guiding column 2. The hanging line conical weight 71 suspended by the steel wire rope 7 can drive the floating cylinder 5 to be pulled out of the guiding column 2 upward, which is beneficial to the maintenance and sampling work of the floating cylinder 5. In this way, both the sealing performance inside the guiding column 2 is ensured, and the sampling, maintenance and other work are convenient.

[0032] When a radar level meter is installed on the upper end of the guide column 2, the wire rope 7 is a waveguide wire rope provided with the radar level meter. The function of the wire rope 7 is to pull the buoy 5 out of the guide column 2 when measuring or sampling through the guide column 2, when the radar level meter needs to be repaired, or when there is a problem with the buoy 5 itself.

[0033] In this embodiment, the upper surface of the lower sealing plate 3 is provided with multiple circles of rectangular grooves 32 surrounding the coaxial hole 31, and the rectangular grooves 32 are filled with graphite strip fillers 33. When the upper sealing plate 4 is placed on the lower sealing plate 3, a seal is formed by the multiple circles of graphite strip fillers 33. The graphite strip fillers 33 are pressed into the rectangular grooves 32 and are slightly larger than the size of the rectangular grooves 32. Graphite powder is evenly filled between the graphite strip fillers 33 to ensure sealing and have a lubricating effect, so that the upper sealing plate 4 can move horizontally relative to the lower sealing plate 3.

[0034] In this embodiment, the upper surface of the upper sealing plate 4 is provided with an annular recessed groove 41 surrounding the guide column 2, and a sealing packing 42 is provided in the annular recessed groove 41. The upper sealing plate 4 is provided with a packing gland 43 for pressing the sealing packing 42. The sealing between the upper sealing plate 4 and the guide column 2 is achieved by the sealing packing 42. The packing gland 43 is fixed to the upper sealing plate 4 by a plurality of fastening screws 44 and presses the sealing packing 42, so as to facilitate the replacement of the sealing packing 42. In this embodiment, the sealing packing 42 is a graphite packing with a cutout, which is pressed at least two times and the cutouts are staggered, and the packing gland 43 is two semicircular rings with bosses.

[0035] In this embodiment, the upper sealing plate 4 and the lower sealing plate 3 are both wooden boards, preferably weather-resistant wooden boards. Figure 3 As shown, the upper sealing plate 4 and the lower sealing plate 3 are both formed by splicing two half plates with a semicircular hole in the middle, wherein the joint surfaces of the two half plates are coated with oil-resistant sealant; the two half plates are provided with mounting holes 34 on both sides of the diameter of the semicircular hole, stud bolts 35 are passed through the mounting holes 34 to splice the two half plates into a whole, four mounting holes 34 are provided, and four stud bolts 35 are provided. In the actual processing process, the shape, center hole and mounting hole 34 of the upper sealing plate 4 and the lower sealing plate 3 are first processed, and then cut in half, and finally the joint surfaces are coated with oil-resistant sealant, and during assembly, the stud bolts 35 are used to lock the joint surfaces. Preferably, the upper surface of the floating plate 1 used for mounting the lower sealing plate 3 is also coated with oil-resistant sealant. Similarly, the packing gland 43 is also a semicircular structure of two halves, which is convenient for the disassembly and assembly of the packing gland 43.

[0036] In this embodiment, both the upper sealing plate 4 and the lower sealing plate 3 are square plates, and the side length of the upper sealing plate 4 is greater than that of the lower sealing plate 3. In this way, when the upper sealing plate 4 slides horizontally relative to the lower sealing plate 3, the upper sealing plate 4 always covers the lower sealing plate 3. In this embodiment, the minimum side length of the lower sealing plate 3 is 200 mm larger than the diameter of the through hole 11 of the floating disc 1, the thickness of the lower sealing plate 3 is about 50 mm, and the thickness of the upper sealing plate is adjusted according to the gas phase space pressure under the floating disc, the density of the wood board, and the sliding sealing area.

[0037] In this embodiment, external thread segments are provided at both ends of the through-core screw 6 extending out of the floating cylinder 5, and nuts 62 are screwed on the external thread segments. The bottoms of the upper butterfly leather cup 51 and the lower butterfly leather cup 52 are both sleeved with leather cup pressing caps 53 through the through-core screw 6 and are tightened by the nuts 62. The function of the leather cup pressing cap 53 is to press the bottom of the butterfly leather cup to prevent deformation, so that only the bent part of the butterfly leather cup is in sealing contact with the inner wall of the guide post 2; the diameter of the bent part of the butterfly leather cup is larger than the inner diameter of the guide post 2.

[0038] In this embodiment, the floating cylinder 5, the leather cup pressing cap 53, and the through-core screw 6 are all made of copper. An electrostatic conductive copper sheet 8 is also fixed on the upper butterfly leather cup 51 through the through-core screw 6 and the nut 62. The electrostatic conductive copper sheet 8 is used to conduct away the static electricity generated by friction. Specifically, the electrostatic conductive copper sheet 8 is of a V-shaped structure, and both ends are bent into arcs 81. The vertex of the arc 81 contacts the inner wall of the guide post 2, so as to ensure that the electrostatic conductive copper sheet 8 is in sliding contact with the inner wall of the guide post 2.

[0039] In this embodiment, the upper butterfly leather cup 51, the lower butterfly leather cup 52, and the rubber hose 61 are all made of wear-resistant and oil-resistant rubber.

[0040] In this embodiment, the through-core screw 6 is welded and sealed on the upper and lower end covers of the floating cylinder 5. The hanging wire conical weight 71 is a copper hammer, and its maximum diameter is larger than the diameter of the through-core screw 6 and smaller than the inner diameter of the guide post 2.

[0041] In this embodiment, an atmospheric storage tank is further provided, including: a tank body and the internal and external sealing device of the floating roof guide post pipe of the atmospheric storage tank as described above.

[0042] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An internal and external sealing device for a floating roof guide column pipe of an atmospheric storage tank, comprising a floating disc (1) and a guide column (2). A through hole (11) is provided on the floating disc (1), and the guide column (2) passes through the through hole (11). The diameter of the through hole (11) is larger than the diameter of the guide column (2), and it is characterized in that: The upper surface of the floating disc (1) is fixedly provided with a lower sealing plate (3). The lower sealing plate (3) is provided with a coaxial hole (31) having the same diameter as the through hole (11). An upper sealing plate (4) is slidably and sealingly arranged on the lower sealing plate (3). The upper sealing plate (4) is sealingly connected to the guide post (2). A floating cylinder (5) is arranged inside the guide post (2). An upper butterfly leather cup (51) is arranged at the upper end of the floating cylinder (5). A lower butterfly leather cup (52) is arranged at the lower end of the floating cylinder (5). Two oil passing holes (521) are arranged on the bent part of the lower butterfly leather cup (52). A hollow screw rod (6) is sealingly arranged inside the floating cylinder (5). A rubber hose (61) is arranged inside the hollow screw rod (6). A steel wire rope (7) is sealingly passed through the rubber hose (61). The lower end of the steel wire rope (7) is connected with a suspension line conical weight (71). The upper end of the steel wire rope (7) is connected to the center of the sealing cover plate (21) at the top of the guide post (2).

2. The internal and external sealing device for the floating roof guiding column pipe of the atmospheric storage tank according to claim 1, wherein: The upper surface of the lower sealing plate (3) is provided with a multi-turn rectangular groove (32) surrounding the coaxial hole (31). The rectangular groove (32) is filled with graphite strip packing (33).

3. The internal and external sealing device of the floating roof guiding column pipe of the atmospheric storage tank according to claim 1, characterized in that: The upper surface of the upper sealing plate (4) is provided with an annular sink (41) surrounding the guide post (2). A sealing packing (42) is arranged inside the annular sink (41). A packing gland (43) for pressing the sealing packing (42) is arranged on the upper sealing plate (4).

4. The internal and external sealing device for the floating roof guide column pipe of the atmospheric storage tank according to claim 1, wherein: Both the upper sealing plate (4) and the lower sealing plate (3) are wooden plates. Both the upper sealing plate (4) and the lower sealing plate (3) are formed by splicing two half plates with semi-circular holes in the middle. The joint surfaces of the two half plates are coated with oil-resistant sealant. The two half plates are provided with mounting holes (34) on both sides of the semi-circular holes. A double-headed bolt (35) is passed through the mounting holes (34) to splice the two half plates into a whole.

5. The internal and external sealing device for the floating roof guiding column pipe of the atmospheric storage tank according to claim 1, wherein: The side length of the upper sealing plate (4) is greater than the side length of the lower sealing plate (3).

6. The internal and external sealing device for the floating roof guide column pipe of the atmospheric storage tank according to claim 1, characterized in that: Nuts (62) are arranged at both ends of the hollow screw rod (6). The bottoms of the upper butterfly leather cup (51) and the lower butterfly leather cup (52) are both sleeved with leather cup pressing covers (53) through the hollow screw rod (6) and are pressed by the nuts (62).

7. The internal and external sealing device for the floating roof guide column pipe of the atmospheric storage tank according to claim 6, characterized in that: The floating cylinder (5), the leather cup pressing cover (53) and the hollow screw rod (6) are all made of copper. An electrostatic conductive copper sheet (8) is also fixed on the upper butterfly leather cup (51) through the hollow screw rod (6) and the nut (62).

8. The internal and external sealing device for the floating roof guide column pipe of the atmospheric storage tank according to claim 7, characterized in that: The electrostatic conductive copper sheet (8) is of a V-shaped structure, and both ends are bent into arcs (81). The vertex of the arc (81) contacts the inner wall of the guide post (2).

9. The internal and external sealing device for the floating roof guiding column pipe of the atmospheric storage tank according to claim 1, characterized in that: The upper butterfly leather cup (51), the lower butterfly leather cup (52) and the rubber hose (61) are all made of wear-resistant and oil-resistant rubber.

10. An atmospheric storage tank, characterized in that, Comprising: A tank body and an atmospheric storage tank floating roof guide post pipe inner and outer sealing device as described in any one of claims 1-9.

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