Nitrogen seal assembly of external floating roof storage tank with oil installation

Abstract

The utility model provides an external floating roof storage tank nitrogen seal assembly with oil installation, relates to the technical field of petroleum storage and transportation, and solves the technical problems of complex transformation and use and limited application in the prior art. The assembly comprises a pipe joint, a telescopic sealing sleeve and a guide mechanism sealing cover, the pipe joint is connected with the top of an original guide pipe, the pipe joint is used for being connected with external nitrogen supply and return equipment, and the top end of the telescopic sealing sleeve is connected with the original guide pipe below the oil measuring platform. And the guide mechanism sealing cover is arranged at the bottom end of the telescopic sealing sleeve and covers the original guide mechanism in a sealing manner. According to the utility model, the pipe joint, the telescopic sealing sleeve and the guide mechanism sealing cover are matched with the original guide pipe and the original guide mechanism to realize the effects of supplying nitrogen and returning nitrogen towards the lower part of the floating disc, and the transformation can be carried out under the condition that oil is stored in the external floating roof storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum storage and transportation, in particular to a nitrogen sealing component for an external floating roof storage tank installed with oil. Background Art

[0002] Floating roof tanks are divided into external floating roof tanks and internal floating roof tanks. Large tanks usually adopt external floating roof structure. The State Administration of Work Safety has issued the "Ten Regulations on Fire Prevention and Explosion Prevention in Oil and Gas Tank Areas" in response to the safety and environmental protection issues of floating roof falling to the bottom. It clearly stipulates that it is strictly forbidden for the floating roof of internal floating roof tanks to fall to the bottom during operation. At the same time, most companies also clearly prohibit the working state of large external floating roof tanks falling to the bottom during operation, which has led to a direct decrease of nearly 20% in the overall volume utilization rate of floating roof oil tanks.

[0003] At present, the best solution to the safety and environmental protection problem of the floating plate falling to the bottom is nitrogen sealing. Nitrogen sealing means transforming the storage tank into a closed structure, installing a nitrogen pipeline on the top of the oil tank, and controlling the gas volume and tank pressure entering the oil tank through a pressure regulating valve to always keep the oil tank in a slightly positive pressure state. When the oil tank is discharging oil, outside air is not allowed to enter the oil tank, but nitrogen is used to prevent the oil and gas from being ignited. When the oil tank is collecting oil, the oil-containing gas in the tank is collected and recycled through pipelines to prevent the oil and gas from being discharged into the atmosphere and polluting the environment.

[0004] The existing Chinese patent with the publication number CN113003027 discloses a safety protection system for the floating plate of a floating roof storage tank during the bottoming process. In order to achieve nitrogen sealing of the oil tank, a nitrogen injection and exhaust assembly is set at the bottom of the oil tank. The nitrogen injection and exhaust assembly is fixedly connected to the manhole at the bottom of the tank, and the nitrogen injection and exhaust port is close to the lowest position when the floating plate falls to the bottom. The nitrogen injection and exhaust assembly is then connected to the nitrogen recovery supply system. The safety and environmental protection problems when the floating plate falls to the bottom are solved by injecting nitrogen and VOCS recovery treatment. However, the structure is complicated, and the oil tank needs to be emptied and cleaned before it can be modified and installed. And when in use, there is residual liquid storage in the assembly. Only after the liquid in the assembly is emptied can it be started to inject nitrogen or extract oil-containing gas. The operation process is complicated, resulting in limited application. Utility Model Content

[0005] The purpose of the utility model is to provide a nitrogen sealing assembly for an external floating roof tank with oil installation, which solves the technical problems of complex transformation and use and limited application in the prior art. The preferred technical solution among the many technical solutions provided by the utility model can produce many technical effects as described below.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a nitrogen sealing assembly for an external floating roof storage tank installed with oil, comprising a pipe joint, a telescopic sealing sleeve and a guide mechanism sealing cover, wherein the pipe joint is connected to the top of an original guide pipe, the pipe joint is used to be connected to an external nitrogen supply return device, the top end of the telescopic sealing sleeve is connected to the original guide pipe below an oil measuring platform, the guide mechanism sealing cover is arranged at the bottom end of the telescopic sealing sleeve, and the guide mechanism sealing cover is covered on the original guide mechanism in a sealed manner.

[0008] Preferably, the telescopic sealing sleeve comprises a sealing membrane and a split frame, and the split frame is arranged in a sleeve-shaped body formed by surrounding the sealing membrane.

[0009] Preferably, it further comprises an airtight zipper arranged on the sealing film, and the airtight zipper is arranged along the length direction of the sealing film.

[0010] Preferably, the telescopic sealing sleeve is connected to the original guide pipe through a throat clamp.

[0011] Preferably, the top of the guide mechanism sealing cover has a through hole, the original guide tube is located in the through hole, and the telescopic sealing sleeve is connected to the peripheral side of the through hole through a split flange gasket.

[0012] Preferably, the guide mechanism sealing cover comprises a first shell and a second shell, the first shell and the second shell are buckled with each other, and the first shell and the second shell are both connected to the original guide mechanism.

[0013] Preferably, flange edges are provided on the first shell and the second shell, and the first shell and the second shell are connected to the flange edges by bolts.

[0014] Preferably, the pipe joint is a tee, a first end of the tee is connected to the original guide pipe, a liquid level detector is provided at the second end of the tee, and a third end of the tee is used to connect to the external nitrogen supply return device.

[0015] Preferably, the external nitrogen supply back equipment includes a nitrogen supply device and a nitrogen recovery and disposal device, and both the nitrogen supply device and the nitrogen recovery and disposal device are connected to the pipe joint through a control valve.

[0016] This application adopts the above technical solution, which has at least the following beneficial effects:

[0017] The nitrogen sealing assembly of the external floating roof storage tank installed with oil includes a pipe joint, a telescopic sealing sleeve and a guide mechanism sealing cover. The pipe joint is connected to the top of the original guide pipe. The pipe joint is used to connect with the external nitrogen supply return equipment. Nitrogen can enter and discharge from the pipe joint. The top of the telescopic sealing sleeve is connected to the original guide pipe under the oil measuring platform. The bottom of the telescopic sealing sleeve is provided with a guide mechanism sealing cover. The guide mechanism sealing cover is sealed on the original guide mechanism in a sealed manner. The original guide pipe and the guide mechanism are sealed by the telescopic sealing sleeve and the guide mechanism sealing cover to ensure that the nitrogen entering the original guide pipe from the pipe joint will not escape to the outside world, and the nitrogen is restricted from passing through the original guide mechanism and the original guide pipe. Nitrogen can enter the bottom of the floating plate or be discharged from the space under the floating plate. The nitrogen sealing assembly of the external floating roof storage tank installed with oil provided by the present application is a related assembly located at the top of the external floating roof storage tank, and the arrangement method does not produce open flames, etc. Therefore, it can be installed when oil is stored in the external floating roof storage tank, making the installation simple and easy, and there is no restriction when using it.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of a nitrogen sealing assembly for an external floating roof storage tank with oil installation provided by an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the AA section structure;

[0022] Figure 3 yes Figure 1 Schematic diagram of the BB cross-section structure;

[0023] Figure 4 yes Figure 1 Schematic diagram of the enlarged structure of local C in the middle.

[0024] In the figure, 1, pipe joint; 2, telescopic sealing sleeve; 3, sealing cover of guide mechanism; 4, original guide pipe; 5, oil measuring platform; 6, original guide mechanism; 7, sealing membrane; 8, split frame; 9, airtight zipper; 10, throat clamp; 11, first shell; 12, second shell; 13, flange edge; 14, liquid level detector; 15, split flange gasket; 16, floating plate; 17, air vent of pipe wall; 18, strip hole of guide mechanism. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0026] The specific embodiment of the utility model provides a nitrogen sealing assembly for an external floating roof storage tank with oil installation, combined with the attached Figure 1 As shown, it mainly includes a pipe joint 1, a telescopic sealing sleeve 2 and a guide mechanism sealing cover 3;

[0027] The pipe joint 1 is connected to the top of the original guide pipe 4, and the pipe joint 1 is used to connect to the external nitrogen supply and return equipment, and the external nitrogen supply and return equipment is used to supply and recover nitrogen; nitrogen can flow between the pipe joint 1 and the original guide pipe 4;

[0028] The top of the telescopic sealing sleeve 2 is connected to the original guide pipe 4 below the oil measuring platform 5, and the bottom of the telescopic sealing sleeve 2 is provided with a guide mechanism sealing cover 3. The telescopic sealing sleeve 2 is used to achieve a sealed connection with the original guide pipe 4. Because a plurality of pipe wall vents 17 are provided in the length direction of the original guide pipe 4 of the original external floating roof storage tank, the telescopic sealing sleeve 2 is provided to confine nitrogen in the telescopic sealing sleeve 2 to prevent nitrogen from leaking out.

[0029] The guide mechanism sealing cover 3 is sealed on the original guide mechanism 6. The original guide mechanism 6 can be sealed by the guide mechanism sealing cover 3. The original guide mechanism 6 is arranged above the floating plate 16 of the original external floating roof storage tank. The original guide mechanism 6 can be slidably arranged on the original guide pipe 4. In this way, the original guide pipe 4 and the original guide mechanism 6 on the floating plate 16 are sealed by both the telescopic sealing sleeve 2 and the guide mechanism sealing cover 3 to avoid nitrogen leakage, and ensure that nitrogen can only enter the bottom of the floating plate 16 from the inlet pipe wall vent 17 on the original guide pipe 4 below the floating plate 16 and the guide mechanism strip hole 18 on the original guide mechanism 6.

[0030] The above-mentioned pipe joint 1, telescopic sealing sleeve 2 and guide mechanism sealing cover 3, in actual installation, only need to remove the liquid level detector 14 originally set on the top of the original guide tube 4, and then set the pipe joint 1. For this purpose, the pipe joint 1 is a tee, the first end of the tee is connected to the original guide tube 4, the second end of the tee is provided with the liquid level detector 14, and the third end of the tee is used to connect the external nitrogen supply return device, so that the normal operation of the liquid level detector 14 can be ensured, and nitrogen can be introduced into the original guide tube 4 or nitrogen can flow from the original guide tube 4 to the external nitrogen supply return device; pipe joint After the head 1 is installed, the telescopic sealing sleeve 2 can be set to the outside of the original guide pipe 4 below the oil measuring platform 5. The bottom of the telescopic sealing sleeve 2 is connected to the guide mechanism sealing cover 3, and the guide mechanism sealing cover 3 is set in the original guide mechanism 6. In this way, the installation of this component can be realized. After connecting the external nitrogen supply back to the equipment, it can work. There is no open flame during the installation process. Therefore, it can be installed when the oil is stored in the external floating roof tank, making the installation simple and easy. During use, there will be no problems such as injecting nitrogen from the bottom and extracting the oil-containing gas in the prior art.

[0031] In one embodiment of the present application, Figure 1 As shown, the telescopic sealing sleeve 2 includes a sealing membrane 7 and a split frame 8. The split frame 8 can be a circular ring structure or a semi-circular ring structure. The split frame 8 is connected to the inner wall of the sealing membrane 7 to support the sealing membrane 7, which forms a sleeve-like body surrounded by the sealing membrane 7.

[0032] To facilitate the actual installation, the sealing film 7 can be set into a sheet structure, and airtight zippers 9 are set on both sides of the sealing film 7. The airtight zipper 9 is set along the length direction of the sealing film 7. The two sides of the sealing film 7 are connected by the airtight zipper 9, so that a sleeve-like structure can be formed. This structural form is more convenient for installation with the telescopic sealing sleeve 2.

[0033] After the telescopic sealing sleeve 2 is installed, the telescopic sealing sleeve 2 can be connected to the original guide pipe 4 through the throat clamp 10.

[0034] In another embodiment of the present application, a through hole can also be set at the top center of the guide mechanism sealing cover 3, the original guide tube 4 is located in the through hole, the telescopic sealing sleeve 2 is connected to the peripheral side of the through hole through the split flange gasket 15, and the telescopic sealing sleeve 2 is sealed through the split flange gasket 15.

[0035] Specifically in the present application, the guide mechanism sealing cover 3 can also include a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 have a semi-annular shell structure. The first shell 11 and the second shell 12 can be interlocked to form a whole annular sealing cover structure. The first shell 11 and the second shell 12 are both connected to the original guide mechanism 6. Specifically, bolts are used to achieve the connection with the original guide mechanism 6, which is convenient and quick, and there is no safety hazard.

[0036] Flange edges 13 may also be provided at the places where the first shell 11 and the second shell 12 are buckled together, and the first shell 11 and the second shell 12 are connected to the two flange edges 13 by bolts.

[0037] It should be noted that the external nitrogen supply back equipment in the present application includes a nitrogen supply device and a nitrogen recovery and disposal device, both of which are connected to the pipe joint 1 through a control valve. When the floating plate of the external floating roof storage tank falls to the bottom of the oil delivery operation, the control valve at the nitrogen supply device is opened, and the control valve pipe wall at the nitrogen recovery and disposal device, at this time, the nitrogen enters the original guide pipe 4 through the pipe joint 1, and the nitrogen will move downward along the original guide pipe 4. Part of the nitrogen will enter the telescopic sealing sleeve 2 but will still move downward, and then the nitrogen will pass through the guide mechanism strip hole 18 on the original guide mechanism 6 to enter the bottom of the floating plate 16, and the nitrogen in the original guide pipe 4 will enter the bottom of the floating plate 16 through the pipe wall vent 17 below the floating plate 16, thereby realizing the nitrogen sealing protection of the gas phase space of the oil tank to prevent fire.

[0038] During the oil collection operation when the floating plate of the external floating roof storage tank falls to the bottom, part of the gas discharged from the storage tank enters the original guide pipe 4 through the pipe wall vent hole 17 and rises, and part of the gas enters the telescopic sealing sleeve 2 through the guide mechanism strip hole 18 and rises. Finally, the nitrogen will enter the top position of the original guide pipe 4, and enter the nitrogen recovery and disposal device with the control valve opened through the pipe joint 1, while the control valve at the nitrogen supply device is in a closed state. The nitrogen recovery and disposal device performs harmless treatment on the mixed gas to prevent oil and gas from being discharged into the air and causing environmental pollution.

[0039] The nitrogen supply device and nitrogen recovery and disposal device in this application are both conventional equipment and do not belong to the protection points of this application, so they will not be described in detail.

[0040] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", "some examples", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A nitrogen sealing assembly for an external floating roof storage tank with oil installation, characterized in that: It includes a pipe joint, a telescopic sealing sleeve and a guide mechanism sealing cover. The pipe joint is connected to the top of the original guide pipe. The pipe joint is used to connect to the external nitrogen supply return equipment. The top of the telescopic sealing sleeve is connected to the original guide pipe below the oil measuring platform. The guide mechanism sealing cover is arranged at the bottom end of the telescopic sealing sleeve. The guide mechanism sealing cover is covered on the original guide mechanism in a sealed manner.

2. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The telescopic sealing sleeve comprises a sealing membrane and a split frame, wherein the split frame is arranged in a sleeve-shaped body formed by the sealing membrane.

3. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 2, characterized in that: It also includes an airtight zipper arranged on the sealing film, and the airtight zipper is arranged along the length direction of the sealing film.

4. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The telescopic sealing sleeve is connected to the original guide pipe through a throat hoop.

5. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The top of the guide mechanism sealing cover is provided with a through hole, the original guide tube is located in the through hole, and the telescopic sealing sleeve is connected to the peripheral side of the through hole through a split flange gasket.

6. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The guide mechanism sealing cover comprises a first shell and a second shell, the first shell and the second shell are buckled with each other, and the first shell and the second shell are both connected to the original guide mechanism.

7. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 6, characterized in that: The first shell and the second shell are both provided with flange edges, and the first shell and the second shell are connected to the flange edges by bolts.

8. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The pipe joint is a tee, a first end of the tee is connected to the original guide pipe, a liquid level detector is arranged at the second end of the tee, and a third end of the tee is used to connect to the external nitrogen supply return device.

9. The nitrogen sealing assembly for an external floating roof storage tank installed with oil according to claim 1, characterized in that: The external nitrogen supply back equipment includes a nitrogen supply device and a nitrogen recovery and disposal device, and the nitrogen supply device and the nitrogen recovery and disposal device are both connected to the pipe joint through a control valve.

Images