Nitrogen pipeline sweeping device for oil inlet pipe of inner floating roof tank
By setting up a centralized oil and gas distribution barrel and multiple oil and gas diffusion pipelines in the inner floating roof tank, the layout and pore size of the diffusion hole group is optimized, and the safety hazards of the floating disk being impacted by the gas-liquid two-phase flow medium during the nitrogen sweep line are solved, and floating is achieved Safe operation of the disk.
Patent Information
- Application Number
- CN202421221484.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-30
AI Technical Summary
During the nitrogen sweep process of the inner floating roof tank, the rapid diffusion and violent disturbance of the gas-liquid two-phase flow medium lead to vibration, overturning or tearing of the floating disk, which poses a major safety hazard.
Design a nitrogen sweep line device for the oil inlet pipe of the inner floating roof tank. By setting up a centralized oil and gas distribution barrel and multiple oil and gas diffusion pipelines in the inner floating roof tank, the optimized layout of the diffusion hole group and the gradual expansion of the diffusion holes are used to reduce gas and liquid Impact velocity and stress distribution of two-phase flow medium.
It effectively reduces the velocity and stress distribution of the floating disk being impacted by the gas-liquid two-phase flow medium, and eliminates the severe "gas strike" phenomenon caused by the gas-liquid two-phase flow medium on the floating disk to the maximum, ensuring the safe operation of the floating disk.
Smart Images
Figure CN222453216U_ABST
Abstract
Description
[Technical field]
[0001] The utility model relates to the technical field of internal floating roof tanks, in particular to a nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank. [Background technology]
[0002] Internal floating roof tanks are used to store light oil products and play an important role in reducing the oil and gas loss of stored oil. The floating plate is an important component in the internal floating roof tank. During the operation of the internal floating roof tank, the floating plate always floats on the liquid surface, which can not only reduce the evaporation loss of oil products, but also has a certain protective effect on the combustion area of the stored oil products in the event of an accident such as a fire.
[0003] For a long time, people have paid little attention to the operation of the floating plate, and there are few studies on the safe operation of the floating plate. However, in the actual production process, the floating plate is often stuck, overturned, and the "gas shock" phenomenon of the sweeping line occurs, especially the "gas shock" phenomenon of the sweeping line damages the floating plate and the seal. At present, there is no mature and reliable solution for using gas to purge the liquid in the oil pipeline into the internal floating roof tank. The main reason is that during the gas sweeping process, the oil and gas will form a gas-liquid two-phase flow medium in the shorter oil inlet diffusion pipe, and the gas-liquid two-phase flow medium entering the internal floating roof tank diffuses very quickly, causing the medium in the internal floating roof tank to produce local violent disturbances near the oil inlet pipe, causing the floating plate in the internal floating roof tank to vibrate or even overturn or tear, so there is a great safety hazard. [Contents of the utility model]
[0004] In view of the above-mentioned problems, the purpose of the utility model is to provide a nitrogen sweeping device for the oil inlet pipe of an internal floating roof tank, which can reduce the speed and stress distribution of the floating plate impacted by the gas-liquid two-phase flow medium, thereby maximally eliminating the violent "gas shock" phenomenon caused by the gas-liquid two-phase flow medium on the floating plate, and ensuring the safe operation of the floating plate.
[0005] The utility model is implemented as follows: a nitrogen sweeping device for an oil inlet pipe of an inner floating roof tank comprises an inner floating roof tank, a floating plate, an oil pipeline, a nitrogen delivery pipeline, an oil and gas centralized distribution barrel and an oil and gas diffusion pipeline, wherein the floating plate is arranged in the inner floating roof tank, and the nitrogen delivery pipeline is connected to the oil pipeline; the oil and gas centralized distribution barrel is arranged at the inner bottom of the inner floating roof tank, and the oil pipeline is connected to the oil and gas centralized distribution barrel; a plurality of oil and gas diffusion pipelines are arranged around the oil and gas centralized distribution barrel, each of the oil and gas diffusion pipelines is connected to the inside of the oil and gas centralized distribution barrel, and each of the oil and gas diffusion pipelines is provided with a plurality of diffusion hole groups at intervals along the length direction, and the diffusion hole groups are arranged toward the inner bottom of the inner floating roof tank.
[0006] Furthermore, each of the diffusion hole groups includes a plurality of diffusion holes, and each of the diffusion holes points to the inner bottom of the internal floating roof tank at a different angle.
[0007] Furthermore, the diameter of the diffusion holes of the diffusion hole group on the oil and gas diffusion pipeline gradually increases from the connecting end to the free end.
[0008] Furthermore, the interval between two adjacent diffusion hole groups is 190-210 mm, each diffusion hole group includes 3-6 diffusion holes, and the aperture of the diffusion hole is 25 mm-45 mm.
[0009] Furthermore, a plurality of oil and gas diffusion pipes with different diameters are arranged around the oil and gas centralized distribution barrel.
[0010] Furthermore, the flow cross-sectional area of the oil and gas diffusion pipeline is 6-10 times the flow cross-sectional area of the oil pipeline.
[0011] Furthermore, at least one first mechanical breathing valve is provided on the floating plate.
[0012] Furthermore, at least one second mechanical breathing valve and at least one breathing valve with a flame arrester are provided on the top of the internal floating roof tank.
[0013] Furthermore, the oil pipeline is provided with a first control valve and a second control valve, the nitrogen delivery pipeline is connected between the first control valve and the second control valve, and the nitrogen delivery pipeline is provided with a third control valve.
[0014] Furthermore, the oil pipeline is connected to the middle and lower part of the oil and gas centralized distribution barrel, and the oil and gas diffusion pipeline is arranged at the upper part of the oil and gas centralized distribution barrel.
[0015] By adopting the technical solution of the utility model, at least the following beneficial effects are achieved:
[0016] 1. An oil and gas centralized distribution barrel is arranged in the inner floating roof tank, the oil pipeline is connected to the oil and gas centralized distribution barrel, a plurality of oil and gas diffusion pipelines are arranged around the oil and gas centralized distribution barrel, and each oil and gas diffusion pipeline is provided with a plurality of diffusion hole groups at intervals along the length direction, and the diffusion hole groups are arranged toward the inner bottom of the inner floating roof tank; in the process of sweeping the line with nitrogen, the gas-liquid two-phase flow medium can be distributed to each oil and gas diffusion pipeline through the oil and gas centralized distribution barrel, and diffused through the oil and gas diffusion pipeline before entering the inner floating roof tank, so that the speed and stress distribution of the floating plate impacted by the gas-liquid two-phase flow medium can be reduced, thereby improving the safety of the floating plate operation.
[0017] 2. By adopting a fan-shaped oil and gas diffusion pipeline structure and optimizing the diameter of the oil and gas diffusion pipeline, the interval between two adjacent diffusion hole groups, the number of diffusion holes in each diffusion hole group, the aperture of the diffusion holes, the direction of the diffusion holes, etc., the flow characteristics of the gas-liquid two-phase flow medium generated by the sweep line in the internal floating roof tank can be changed, which can further effectively reduce the speed and stress distribution of the floating plate impacted by the gas-liquid two-phase flow medium, thereby maximally eliminating the violent "gas shock" phenomenon caused by the gas-liquid two-phase flow medium on the floating plate, ensuring the safe operation of the floating plate.
Brief Description of the Drawings
[0018] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.
[0019] Figure 1 This is a front view of a nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank according to the utility model;
[0020] Figure 2 It is a top view of a nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank of the utility model;
[0021] Figure 3 It is a distribution diagram of the diffusion hole group on the oil and gas diffusion pipeline in the utility model.
[0022] Description of reference numerals:
[0023] Nitrogen sweeping device 100;
[0024] Internal floating roof tank 1;
[0025] Floating plate 2;
[0026] Oil pipeline 3;
[0027] Nitrogen delivery pipeline 4;
[0028] Oil and gas centralized distribution barrel 5;
[0029] Oil and gas diffusion pipeline 6, diffusion hole group 61, diffusion hole 611;
[0030] A first mechanical breathing valve 71, a second mechanical breathing valve 72, and a breathing valve with a flame arrester 73;
[0031] A first control valve 81 , a second control valve 82 , and a third control valve 83 . [Specific implementation method]
[0032] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0033] It should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing these embodiments 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. In addition, the terms "first", "second", etc., etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.
[0034] See also Figures 1 to 3 As shown, the utility model is a nitrogen sweeping device 100 for an oil inlet pipe of an internal floating roof tank, and the nitrogen sweeping device 100 comprises an internal floating roof tank 1, a floating plate 2, an oil pipeline 3, a nitrogen delivery pipeline 4, an oil and gas centralized distribution barrel 5 and an oil and gas diffusion pipeline 6, wherein the internal floating roof tank 1 is used to store oil products, the floating plate 2 is used to float on the liquid surface of the oil products to reduce the evaporation loss of the oil products, the oil pipeline 3 is used to input the oil products into the internal floating roof tank 1, the nitrogen delivery pipeline 4 is used to transport nitrogen for sweeping, the oil and gas centralized distribution barrel 5 is used to distribute the oil and gas to each oil and gas diffusion pipeline 6, and the oil and gas diffusion pipeline 6 is used to diffuse the oil and gas and transport the oil and gas to the internal floating roof tank 1.
[0035] The floating plate 2 is arranged in the inner floating roof tank 1, and the nitrogen delivery pipeline 4 is connected to the oil pipeline 3 so as to use nitrogen to sweep the oil pipeline 3; the oil and gas centralized distribution barrel 5 is arranged at the inner bottom of the inner floating roof tank 1, and the oil pipeline 3 is connected to the oil and gas centralized distribution barrel 5 so as to use the oil pipeline 3 to transport oil and gas to the oil and gas centralized distribution barrel 5 for centralized distribution; a plurality of oil and gas diffusion pipelines 6 are arranged around the oil and gas centralized distribution barrel 5, each of which is connected to the inside of the oil and gas centralized distribution barrel 5, and each of which is provided with a plurality of diffusion hole groups 61 at intervals along the length direction, and the diffusion hole groups 61 are arranged toward the inner bottom of the inner floating roof tank 1 to reduce the influence on the floating plate 2 floating on the oil liquid surface.
[0036] The utility model arranges an oil and gas centralized distribution barrel 5 in the inner floating roof tank 1, connects the oil pipeline 3 with the oil and gas centralized distribution barrel 5, arranges a plurality of oil and gas diffusion pipelines 6 around the oil and gas centralized distribution barrel 5, and each oil and gas diffusion pipeline 6 is provided with a plurality of diffusion hole groups 61 at intervals along the length direction, and the diffusion hole groups 61 are arranged toward the inner bottom of the inner floating roof tank 1; so that in the process of sweeping the line with nitrogen, the gas-liquid two-phase flow medium can be distributed to each oil and gas diffusion pipeline 6 through the oil and gas centralized distribution barrel 5, and diffused through the oil and gas diffusion pipeline 6 before entering the inner floating roof tank 1, so that the speed and stress distribution of the floating plate 2 impacted by the gas-liquid two-phase flow medium can be reduced, thereby improving the safety of the operation of the floating plate 2.
[0037] In some embodiments of the utility model, each of the diffusion hole groups 61 includes a plurality of diffusion holes 611, and each of the diffusion holes 611 points to the inner bottom of the inner floating roof tank 1 at different angles, so that during the line sweeping process, the gas-liquid two-phase flow medium can diffuse at different angles and enter the inner floating roof tank 1. For example, in the specific implementation of the utility model, in each of the diffusion hole groups 61, one of the diffusion holes 611 can be vertically pointed to the inner bottom of the inner floating roof tank 1 at 90°, and the other diffusion holes 611 can be distributed around the diffusion hole 611 at 90°.
[0038] Furthermore, the aperture of the diffusion hole 611 of the diffusion hole group 61 on the oil and gas diffusion pipe 6 gradually increases from the connecting end to the free end, so that the diffusion speed of the gas-liquid two-phase flow medium can be continuously reduced, and the speed at which the floating plate 2 is impacted by the gas-liquid two-phase flow medium can be effectively reduced.
[0039] Furthermore, in order to enable the gas-liquid two-phase flow medium to be better diffused to various positions and further reduce the speed at which the floating plate 2 is impacted by the gas-liquid two-phase flow medium, the interval between two adjacent diffusion hole groups 61 is 190-210mm. For example, the interval between two adjacent diffusion hole groups 61 can be set to any one of 190mm, 195mm, 200mm, 205mm, and 210mm; each of the diffusion hole groups 61 includes 3-6 diffusion holes 611, and the aperture of the diffusion hole 611 is 25mm-45mm. Since the aperture of the diffusion holes 611 of the diffusion hole group 61 gradually expands from the connection end to the free end of the oil and gas diffusion pipeline 6 during the specific implementation of the present invention, the number of the diffusion holes 611 can be gradually reduced from the connection end to the free end of the oil and gas diffusion pipeline 6. For example, as a specific implementation of the present invention, the oil and gas diffusion pipeline 6 is provided with 6 diffusion hole groups 61 in sequence from the connection end to the free end, and the number of the diffusion holes 611 of the 6 diffusion hole groups 61 is 6, 5, 4, 4, 3, and 3 in sequence, and the aperture of the diffusion holes 611 of the 6 diffusion hole groups 61 is 25 mm, 28 mm, 32 mm, 36 mm, 40 mm, and 45 mm in sequence. Of course, the above is only for illustration purposes, and the present invention is not limited thereto. In specific implementation, the interval between the two diffusion hole groups 61, the number of the diffusion holes 611 of each diffusion hole group 61, and the aperture of the diffusion holes 611 can be set according to actual needs.
[0040] Furthermore, a plurality of oil and gas diffusion pipes 6 with different diameters are arranged around the oil and gas centralized distribution barrel 5 .
[0041] Furthermore, the flow cross-sectional area of the oil and gas diffusion pipeline 6 is 6-10 times the flow cross-sectional area of the oil pipeline 3, which can effectively reduce the diffusion speed of the gas-liquid two-phase flow medium.
[0042] The utility model adopts a fan-shaped oil and gas diffusion pipeline 6 structure, and optimizes the diameter of the oil and gas diffusion pipeline 6, the interval between two adjacent diffusion hole groups 61, the number of diffusion holes 611 in each diffusion hole group 61, the aperture of the diffusion hole 611, the direction of the diffusion hole 611, etc., so as to change the flow characteristics of the gas-liquid two-phase flow medium generated by the sweep line in the internal floating roof tank 1, which can further effectively reduce the speed and stress distribution of the floating plate 2 impacted by the gas-liquid two-phase flow medium, thereby maximally eliminating the violent "gas shock" phenomenon caused by the gas-liquid two-phase flow medium on the floating plate 2, and ensuring that the floating plate 2 can operate safely.
[0043] In some embodiments of the utility model, at least one first mechanical breathing valve 71 is provided on the floating plate 2, so that the nitrogen after the sweeping line can be discharged into the upper space of the floating plate 2 through the first mechanical breathing valve 71. When the present invention is implemented, multiple first mechanical breathing valves 71 can be provided on the floating plate 2, so that the nitrogen can be discharged into the upper space of the floating plate 2 faster and better.
[0044] In some embodiments of the utility model, at least one second mechanical breathing valve 72 and at least one breathing valve with flame arrester 73 are provided on the top of the internal floating roof tank 1. The nitrogen entering the upper space of the floating plate 2 during the line sweeping process can be discharged to the outside of the internal floating roof tank 1 through the second mechanical breathing valve 72 and the breathing valve with flame arrester 73, and the breathing valve with flame arrester 73 also has a fire arresting function. When the utility model is implemented, a breathing valve with flame arrester 73 can be provided in the middle of the top of the internal floating roof tank 1, and a plurality of second mechanical breathing valves 72 are distributed around the breathing valve with flame arrester 73 to better achieve exhaust. It should be noted that the first mechanical breathing valve 71, the second mechanical breathing valve 72 and the breathing valve with flame arrester 73 are all prior art, and their specific implementation structures and principles are well known to those skilled in the art, so the first mechanical breathing valve 71, the second mechanical breathing valve 72 and the breathing valve with flame arrester 73 are not introduced in detail here.
[0045] In some embodiments of the utility model, the oil pipeline 3 is provided with a first control valve 81 and a second control valve 82, the nitrogen delivery pipeline 4 is connected between the first control valve 81 and the second control valve 82, and the nitrogen delivery pipeline 4 is provided with a third control valve 83. When the utility model is used, the first control valve 81 is used to control the delivery of oil products, the third control valve 83 is used to control the delivery of nitrogen, and the second control valve 82 can control the delivery of oil products and nitrogen.
[0046] In some embodiments of the present invention, the oil pipeline 3 is connected to the middle and lower part of the oil and gas centralized distribution barrel 5, and the oil and gas diffusion pipeline 6 is arranged at the upper part of the oil and gas centralized distribution barrel 5, so that the gas-liquid two-phase flow medium will be buffered by the oil and gas centralized distribution barrel 5 and then distributed to each oil and gas diffusion pipeline 6.
[0047] The specific working principle of the nitrogen sweeping device 100 of the utility model is as follows: the first control valve 81 on the oil pipeline 3 is closed to stop the oil product from being transported further, and the second control valve 82 is kept in an open state; the third control valve 83 on the nitrogen delivery pipeline 4 is opened, so that the nitrogen enters the oil and gas centralized distribution barrel 5 through the nitrogen delivery pipeline 4 and the oil pipeline 3 in turn, and in this process, the nitrogen and the purged oil product will form a gas-liquid two-phase flow medium; the oil and gas centralized distribution barrel 5 disperses and distributes the gas-liquid two-phase flow medium to each oil and gas diffusion pipeline 6, and after being diffused through each oil and gas diffusion pipeline 6, it enters the inner floating roof tank 1 through the diffusion hole 611, and then the nitrogen is first discharged into the upper space of the floating plate 2 through the first mechanical breathing valve 71 on the floating plate 2, and then the nitrogen in the upper space is discharged to the outside of the inner floating roof tank 1 through the second mechanical breathing valve 72 and the breathing valve with flame arrester 73, and the oil product is stored below the floating plate 2.
[0048] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.
Claims
1. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank, comprising an internal floating roof tank, a floating plate, an oil pipeline and a nitrogen delivery pipeline, wherein the floating plate is arranged in the internal floating roof tank, and the nitrogen delivery pipeline is connected to the oil pipeline; characterized in that: It also includes an oil and gas centralized distribution barrel and an oil and gas diffusion pipeline. The oil and gas centralized distribution barrel is arranged at the inner bottom of the inner floating roof tank, and the oil pipeline is connected to the oil and gas centralized distribution barrel; a plurality of oil and gas diffusion pipelines are arranged around the oil and gas centralized distribution barrel, each of the oil and gas diffusion pipelines is connected to the interior of the oil and gas centralized distribution barrel, and each of the oil and gas diffusion pipelines is provided with a plurality of diffusion hole groups at intervals along the length direction, and the diffusion hole groups are arranged toward the inner bottom of the inner floating roof tank.
2. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank as claimed in claim 1, characterized in that: Each of the diffusion hole groups includes a plurality of diffusion holes, and each of the diffusion holes points to the inner bottom of the internal floating roof tank at a different angle.
3. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank as claimed in claim 2, characterized in that: The diameter of the diffusion holes of the diffusion hole group on the oil and gas diffusion pipeline gradually increases from the connecting end to the free end.
4. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank as claimed in claim 2, characterized in that: The interval between two adjacent diffusion hole groups is 190-210 mm, each diffusion hole group includes 3-6 diffusion holes, and the aperture of the diffusion hole is 25 mm-45 mm.
5. The nitrogen sweeping device for the oil inlet pipe of an internal floating roof tank according to claim 1, characterized in that: A plurality of oil and gas diffusion pipelines with different diameters are arranged around the oil and gas centralized distribution barrel.
6. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank as claimed in claim 5, characterized in that: The flow cross-sectional area of the oil and gas diffusion pipeline is 6-10 times the flow cross-sectional area of the oil pipeline.
7. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank according to any one of claims 1 to 6, characterized in that: At least one first mechanical breathing valve is arranged on the floating plate.
8. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank according to any one of claims 1 to 6, characterized in that: The top of the internal floating roof tank is provided with at least one second mechanical breathing valve and at least one breathing valve with a flame arrester.
9. A nitrogen sweeping device for an oil inlet pipe of an internal floating roof tank according to any one of claims 1 to 6, characterized in that: The oil pipeline is provided with a first control valve and a second control valve, the nitrogen delivery pipeline is connected between the first control valve and the second control valve, and the nitrogen delivery pipeline is provided with a third control valve.
10. The nitrogen sweeping device for the oil inlet pipe of an internal floating roof tank according to claim 1, characterized in that: The oil delivery pipeline is connected to the middle and lower part of the oil and gas centralized distribution barrel, and the oil and gas diffusion pipeline is arranged on the upper part of the oil and gas centralized distribution barrel.