A membrane separation process oil vapor recovery unit for an oil terminal

Abstract

The application relates to the technical field of oil and gas membrane separation, and particularly relates to a membrane separation method oil and gas recovery device for an oil depot, which comprises a gas treatment assembly, a gas pipe assembly and a membrane assembly, the gas pipe assembly comprises an outer sleeve and an inner sleeve, the outer sleeve is installed in the inner part of the gas pipe assembly, a plurality of docking units are equidistantly installed on the outer side wall of the outer sleeve, the gas treatment assembly comprises an air inlet pump, an air exhaust pump, a condensation module and a liquid collecting tank, and the output end of the air inlet pump is communicated with one end of the outer sleeve. In the application, the gas pipe assembly is arranged, the gas is introduced into a pipeline one in the corresponding docking unit, the pipeline one guides the gas into the inner part of the separation membrane, the separation membrane continuously rotates when working, one position on the separation membrane is prevented from being aligned with the pipeline one for a long time, the influence of the concentration gradient of the oil and gas in the separation membrane on the separation membrane is reduced, the working load of the separation membrane is the same as a whole, the membrane separation efficiency is improved, and the stability of the quality is improved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas membrane separation technology, specifically to a membrane separation oil and gas recovery device for oil depots. Background Technology

[0002] In the oil and petrochemical industry, oil depots (including storage tanks and loading / unloading platforms) are one of the main sources of volatile organic compounds (VOCs), especially light oil products, from volatilization and emission. These VOCs not only cause serious waste of valuable energy and economic losses, but are also important precursors to PM2.5 and ozone, posing a significant threat to the environment and human health. Therefore, efficient and reliable oil and gas recovery technologies have become a mandatory environmental requirement and a key aspect of cost reduction and efficiency improvement in oil depot operations. Among numerous oil and gas recovery technologies (such as adsorption, absorption, and condensation), membrane separation stands out due to its advantages, including simple process, flexible operation, no secondary pollution, and relatively low energy consumption.

[0003] Existing membrane separators mostly employ end-inlet or side-inlet methods. When a large amount of oil and gas enters the limited-volume membrane housing at a high flow rate, it creates severe turbulence and collisions at the inlet. This results in the membrane directly facing the inlet experiencing extremely high gas velocity and pressure differential, while the membrane located at the edge of the housing or far from the inlet is in a "starved" state, with significantly lower gas flow rates. This uneven distribution causes some membranes to become prematurely fouled, clogged, or mechanically fatigued, leading to reduced membrane life and separation efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a membrane separation oil and gas recovery device for oil depots to solve the problems mentioned in the background art.

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

[0006] A membrane separation oil and gas recovery device for oil depots includes:

[0007] The tracheal assembly includes an outer sleeve and an inner sleeve, wherein the outer sleeve is installed inside the tracheal assembly and multiple docking units are equidistantly installed on the outer side wall of the outer sleeve;

[0008] A gas handling assembly includes an intake pump, a suction pump, a condensation module, and a collection tank. The output end of the intake pump is connected to one end of an outer sleeve, the input end of the suction pump is fixedly connected to one end of an inner sleeve, the output end of the suction pump is connected to the condensation module, one end of the condensation module is connected to the collection tank, a heating module is installed on one side of the intake pump, and an intake pipe is fixedly connected to the input end of the intake pump. The heating module is used to heat the intake pipe.

[0009] The membrane module, in multiple quantities, includes an inner wall assembly. A separation membrane and an outer shell assembly are detachably mounted on the outer wall of the inner wall assembly. The outer shell assembly is located outside the separation membrane. The inner wall assembly is fixedly connected to pipe one and pipe three. One end of pipe one is fixedly connected to pipe two on the outer wall. One end of pipe two is fixedly connected to the inner wall assembly of the inner wall assembly by multiple branch pipes. The connection point between one end of each branch pipe and the inner wall assembly is located between the separation membrane and the outer shell assembly.

[0010] Furthermore, the docking unit includes an outer connecting pipe, one end of which is fixedly connected to a valve pipe two. The valve pipe two is fixedly installed with the inner sleeve, and the outer connecting pipe is fixedly installed with the outer sleeve. Threaded grooves are provided on the inner wall of the other end of the outer connecting pipe and the outer wall of the other end of the pipe two. The other end of the pipe two is used to screw into the other end of the outer connecting pipe. An inner connecting pipe is installed inside the docking unit, and one end of the inner connecting pipe is used to insert into one end of the pipe one.

[0011] Furthermore, a ring frame is installed on one side of the annular inner wall of the separation membrane, and a pipe is installed on the inner wall of the inner wall component. The pipe is used to drive the separation membrane to rotate through the ring frame.

[0012] Furthermore, a support ring is snapped onto the outer wall of the inner tile, one end of the support ring has an air inlet, and the other end of the support ring has an air outlet. The air inlet is aligned with the pipe, and the air outlet is aligned with the pipe. The support ring is located between the separation membrane and the inner tile, and a gap cavity is formed between the separation membrane and the support ring.

[0013] Furthermore, the drive module includes a second ring frame, a fixed tube, and a reduction gearbox. The second ring frame is rotatably connected to the inner wall of the inner tile. Multiple magnetic blocks are equidistantly embedded in the inner walls of the first and second ring frames. A bevel gear ring is fixedly connected to the inner wall of the second ring frame. The fixed tube is fixedly sleeved with the third pipe. A fan blade is rotatably connected to the top of the fixed tube. A drive shaft is rotatably connected to the inner wall of the fixed tube. The top of the drive shaft is rotatably connected to the fan blade. The bottom of the drive shaft is drively connected to the input end of the reduction gearbox. The first pipe is fixedly installed on the inner tile. A bevel gear is fixedly sleeved at the output end of the reduction gearbox. The bevel gear meshes with the bevel gear ring.

[0014] Furthermore, a closing part is provided on one side of the inner tile, which is used to fit and snap onto the outer shell, and an outer retaining ring is detachably installed on the other side of the inner tile.

[0015] Furthermore, the inner wall of the inner connecting pipe is slidably sleeved with a valve pipe, one end of the valve pipe has a valve hole, and the other end of the valve pipe is fixedly connected with a limiting ring, which is used to abut against the pipe.

[0016] Furthermore, the outer wall of the second valve tube is provided with a second valve hole, one end of the first valve tube is fixedly connected to a shaft, one end of the shaft is fixedly installed with two valve plates, and the shaft is slidably inserted into the inner connecting tube.

[0017] Furthermore, one end of the valve tube 2 penetrates the inner wall of the inner sleeve, and one end of the valve tube 2 communicates with the interior of the outer sleeve.

[0018] Furthermore, the top of the liquid collection tank is fixedly connected to a return gas pipe, and one end of the return gas pipe is fixedly connected to the inlet gas pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Through the configuration of the gas pipe assembly, oil and gas are pressurized by the air pump and introduced into the outer sleeve. The gas is then introduced into pipe one through the corresponding docking unit. Pipe one guides the gas into the interior of the separation membrane, and oil molecules permeate to the outside of the separation membrane, forming a highly saturated permeate gas on the outside of the separation membrane. The permeate gas is introduced into the inner sleeve through pipe two. When the separation membrane is working, the separation membrane rotates continuously, avoiding the separation membrane from being aligned with pipe one for a long time. This reduces the influence of the concentration gradient of oil and gas in the separation membrane on the separation membrane, making the overall working load of the separation membrane the same over a long period of time, thus improving the membrane separation efficiency and quality stability.

[0021] 2. By setting up the docking unit, when the membrane module is removed, pipe two is unscrewed from the outer docking pipe, so that one end of pipe one exits from the inner docking pipe, releasing the resistance to the limiting ring. Due to the higher air pressure inside the outer sleeve and the lower air pressure inside the inner sleeve, the valve plate is pushed under the pressure difference, causing the shaft and valve pipe one to move outward, causing valve hole one to be misaligned with the inner docking pipe. The inner wall of the inner docking pipe seals valve hole one. At the same time, when the shaft moves outward, valve hole two is between the two valve plates, so that valve hole two is disconnected from the outer docking pipe. This achieves the sealing of both the outer and inner docking pipes, facilitating the installation and removal of the membrane module. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the membrane module structure in this invention;

[0024] Figure 3 This is a schematic diagram of the tracheal assembly structure in this invention;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the membrane module in this invention;

[0026] Figure 5 This is a schematic diagram of the pipe three-way drive module structure in this invention;

[0027] Figure 6 This is a schematic diagram of the docking unit structure in this invention;

[0028] Figure 7 yes Figure 6 Enlarged view of a portion at point A;

[0029] Figure 8 yes Figure 6 A magnified view of section B.

[0030] In the diagram: 100, Gas handling assembly; 110, Heating module; 111, Inlet pipe; 120, Inlet pump; 130, Suction pump; 140, Condensation module; 150, Liquid collection tank; 151, Return pipe; 200, Gas pipe assembly; 210, Outer sleeve; 220, Inner sleeve; 230, Docking unit; 231, Outer connecting pipe; 232, Inner connecting pipe; 233, Valve pipe one; 234, Valve hole one; 235, Limiting ring; 236, Valve pipe two; 2361, Valve hole two; 237, Shaft; 2371, Valve plate; 30 0. Membrane module; 310. Inner membrane element; 311. Outer retaining ring; 312. Sealing part; 320. Outer shell; 330. Separation membrane; 331. Gap cavity; 332. Ring frame one; 340. Support ring; 341. Air inlet; 342. Air outlet; 350. Pipe one; 360. Pipe two; 361. Branch pipe; 370. Drive module; 371. Ring frame two; 372. Bevel gear ring; 373. Fixing pipe; 374. Fan blade; 375. Reduction gearbox; 376. Bevel gear; 377. Drive shaft; 380. Pipe three. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-5In this embodiment of the invention, a membrane separation oil and gas recovery device for an oil depot includes a gas processing component 100, a gas pipe assembly 200, and a membrane assembly 300. The gas pipe assembly 200 includes an outer sleeve 210 and an inner sleeve 220. The outer sleeve 210 is installed inside the gas pipe assembly 200, and multiple docking units 230 are equidistantly installed on the outer side wall of the outer sleeve 210. The gas processing component 100 includes an intake pump 120, a suction pump 130, a condensation module 140, and a collection tank 150. The output end of the intake pump 120 is connected to one end of the outer sleeve 210, and the input end of the suction pump 130 is fixedly connected to one end of the inner sleeve 220. The output end of the suction pump 130 is connected to the condensation module 140, and one end of the condensation module 140 is connected to the collection tank 150. A heating module 110 is installed on one side of the intake pump 120, and an intake pipe 111 is fixedly connected to the input end of the intake pump 120. 10 is used to heat the inlet pipe 111. The top of the liquid collection tank 150 is fixedly connected to the return pipe 151. One end of the return pipe 151 is fixedly connected to the inlet pipe 111. There are multiple membrane modules 300. The membrane module 300 includes an inner wall 310. The outer wall of the inner wall 310 is detachably mounted with a separation membrane 330 and an outer shell 320. The outer shell 320 is located outside the separation membrane 330. The inner wall of the inner wall 310 is fixedly connected to a pipe 1 350 and a pipe 3 380. One end of the outer wall of the pipe 1 350 is fixedly connected to a pipe 2 360. One end of the pipe 2 360 is fixedly connected to the inner wall of the inner wall 310 with multiple branch pipes 361. One end of the branch pipe 361 is connected to the inner wall 310 between the separation membrane 330 and the outer shell 320. It also includes a mounting frame. All components on the gas treatment assembly 100 and the outer sleeve 210 are fixedly mounted on the mounting frame.

[0033] Specifically, the oil and gas are input through the inlet pipe 111, heated by the heating module 110 to reduce the gas saturation, and then pressurized by the inlet pump 120 before entering the outer sleeve 210. The gas then passes through the corresponding docking unit 230 into the first pipe 350, which guides the gas into the interior of the separation membrane 330. The oil in the oil and gas comes into contact with the separation membrane 330 and dissolves within it. Under pressure difference, the oil molecules permeate to the outside of the separation membrane 330, creating a highly saturated permeate gas on its outer side. The separated waste gas is discharged through the third pipe 380, and the permeate gas enters the inner sleeve 2 through the second pipe 360. Inside the inner sleeve 220, the permeate gas is introduced into the collection tank 150 through the condensation module 140. The condensation module 140 condenses the permeate gas, causing it to precipitate into droplets. The droplets fall into the collection tank 150. The cooled gas is then introduced back into the inlet pipe 111 through the return pipe 151, mixed with the oil and gas, and reintroduced into the membrane module 300 for oil and gas separation. When the separation membrane 330 is working, the separation membrane 330 rotates continuously to prevent the previous position of the separation membrane 330 from being aligned with the pipe 350 for a long time. This reduces the influence of the concentration gradient of oil and gas in the separation membrane 330 on the separation membrane 330, ensuring that the working load of the separation membrane 330 is the same at all points.

[0034] Example 1

[0035] like Figures 2-8As shown, in this embodiment, a ring frame 332 is installed on one annular inner wall of the separation membrane 330, and a pipe 380 is installed on the inner wall of the inner tile 310. The pipe 380 is used to drive the separation membrane 330 to rotate through the ring frame 332. A support ring 340 is snapped onto the outer wall of the inner tile 310. One end of the support ring 340 has an air inlet 341, and the other end has an air outlet 342. The air inlet 341 is aligned with the pipe 350, and the air outlet 342 is aligned with the pipe 380. The support ring 340 is located between the separation membrane 330 and the inner tile 310, forming a gap cavity 331 between the separation membrane 330 and the support ring 340. The drive module 370 includes a ring frame 371, a fixed pipe 373, and a reduction gearbox 375. The ring frame 371 is rotatably connected to the inner wall of the inner tile 310. 2. Multiple magnetic blocks are embedded and installed equidistantly on the inner wall of the second ring frame 371. A bevel ring 372 is fixedly connected to the inner wall of the second ring frame 371. The fixed tube 373 is fixedly sleeved with the third pipe 380. The top end of the fixed tube 373 is rotatably connected to a fan blade 374. The inner wall of the fixed tube 373 is rotatably connected to a drive shaft 377. The top end of the drive shaft 377 is rotatably connected to the fan blade 374. The bottom end of the drive shaft 377 is connected to the input end of the reduction gearbox 375. The first pipe 350 is fixedly installed on the inner tile 310. A bevel gear 376 is fixedly sleeved on the output end of the reduction gearbox 375. The bevel gear 376 meshes with the bevel ring 372. A closing part 312 is provided on one side of the inner tile 310. The closing part 312 is used to fit and snap against the outer shell 320. An outer retaining ring 311 is detachably installed on the other side of the inner tile 310.

[0036] In this embodiment, when the exhaust gas is discharged outward through pipe 380, the gas drives the fan blade 374 to rotate. The fan blade 374 drives the bevel gear 376 to rotate through the transmission shaft 377 and the reduction gearbox 375. The bevel gear 376 drives the bevel gear ring 372 to rotate. The bevel gear ring 372 drives the ring frame 332 to rotate through multiple embedded magnetic blocks, thereby driving the separation membrane 330 to rotate. The rotation of the reduction gearbox 375 reduces the torque of the bevel gear 376 and the rotational speed of the separation membrane 330, so that the separation membrane 330 is in a rotating state during operation, thereby avoiding a single position on the separation membrane 330. After being aligned with pipe 350 for an extended period, the oil and gas enter the gap cavity 331 through pipe 350, then bypass the gap cavity 331 from both sides and enter pipe 380 through the outlet 342. The support ring 340 reduces the thickness of the gap cavity 331, facilitating gas contact with the separation membrane 330 during flow. Furthermore, the annular design of the separation membrane 330 ensures that the airflow trajectory within the gap cavity 331 is arc-shaped, facilitating the collision and contact of oil molecules with the separation membrane 330 during airflow, thereby improving the membrane separation efficiency of the separation membrane 330 for oil and gas.

[0037] Example 2

[0038] like Figures 5-8 As shown, in this embodiment, the docking unit 230 includes an outer docking pipe 231. One end of the outer docking pipe 231 is fixedly connected to a valve pipe 236. The valve pipe 236 is fixedly installed between the valve pipe 236 and the inner sleeve 220. The outer docking pipe 231 is fixedly installed between the outer sleeve 210 and the outer sleeve 210. Threaded grooves are provided on the inner wall of the other end of the outer docking pipe 231 and the outer wall of the other end of the pipe 260. The other end of the pipe 260 is used to screw into the other end of the outer docking pipe 231. An inner docking pipe 232 is installed inside the docking unit 230. One end of the inner docking pipe 232 is used to insert into one end of the pipe 350. A valve tube 233 is slidably sleeved on the inner wall of the connecting pipe 232. One end of the valve tube 233 has a valve hole 234. The other end of the valve tube 233 is fixedly connected to a limit ring 235, which is used to abut against the pipe 350. A valve hole 2361 is opened on the outer wall of the valve tube 236. One end of the valve tube 233 is fixedly connected to a shaft 237. Two valve plates 2371 are fixedly installed on one end of the shaft 237. The shaft 237 is slidably inserted into the inner connecting pipe 232. One end of the valve tube 236 penetrates the inner wall of the inner sleeve 220 and communicates with the inside of the outer sleeve 210.

[0039] In specific implementation, through the setting of the docking unit 230, during installation, the inner sleeve 310 is rotated to screw the second pipe 360 ​​into the outer docking pipe 231. When the second pipe 360 ​​is screwed in, the first pipe 350 pushes the limiting ring 235 inward, so that the first valve hole 234 is connected to the inner docking pipe 232, and the second valve hole 2361 is connected to the outer docking pipe 231. The gas in the outer sleeve 210 enters the first valve pipe 233 through the first valve hole 234, and then introduces the gas into the first pipe 350. The permeate gas in the second pipe 360 ​​enters the outer docking pipe 231, so that the permeate gas enters the inner sleeve 220 through the second valve pipe 236 and the second valve hole 2361. When the membrane module 300 is removed, the second pipe 360 ​​is unscrewed from the outer docking pipe 231, so that the first pipe 350... One end of the tube exits from the inner connecting pipe 232, releasing the resistance to the limiting ring 235. Due to the higher air pressure inside the outer sleeve 210 and the lower air pressure inside the inner sleeve 220, the pressure difference pushes the valve plate 2371, causing the shaft 237 and valve pipe 1 233 to move outward. This causes the valve hole 1 234 to be misaligned with the inner connecting pipe 232, and the inner wall of the inner connecting pipe 232 seals the valve hole 1 234. At the same time, when the shaft 237 moves outward, the valve hole 2361 is located between the two valve plates 2371, causing the valve hole 2361 to be disconnected from the outer connecting pipe 231. This achieves the sealing of both the outer connecting pipe 231 and the inner connecting pipe 232. Similarly, when pipe 2 360 is screwed in, it automatically opens the outer connecting pipe 231 and the inner connecting pipe 232, facilitating the installation and removal of the membrane module 300.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A membrane separation oil and gas recovery device for oil depots, characterized in that, include: The tracheal assembly (200) includes an outer sleeve (210) and an inner sleeve (220), wherein the outer sleeve (210) is installed inside the tracheal assembly (200), and a plurality of docking units (230) are equidistantly installed on the outer side wall of the outer sleeve (210); A gas processing assembly (100) includes an intake pump (120), a vacuum pump (130), a condensation module (140), and a collection tank (150). The output end of the intake pump (120) is connected to one end of the outer sleeve (210), the input end of the vacuum pump (130) is fixedly connected to one end of the inner sleeve (220), the output end of the vacuum pump (130) is connected to the condensation module (140), one end of the condensation module (140) is connected to the collection tank (150), a heating module (110) is installed on one side of the intake pump (120), and an intake pipe (111) is fixedly connected to the input end of the intake pump (120). The heating module (110) is used to heat the intake pipe (111). There are multiple membrane modules (300). Each membrane module (300) includes an inner wall (310). A separation membrane (330) and an outer shell (320) are detachably installed on the outer wall of the inner wall (310). The outer shell (320) is located outside the separation membrane (330). The inner wall of the inner wall (310) is fixedly connected to a first pipe (350) and a third pipe (380). One end of the outer wall of the first pipe (350) is fixedly connected to a second pipe (360). One end of the second pipe (360) is fixedly connected to the inner wall of the inner wall (310) with multiple branch pipes (361). The connection point between one end of the branch pipe (361) and the inner wall (310) is located between the separation membrane (330) and the outer shell (320). A ring frame (332) is installed on one side of the annular inner wall of the separation membrane (330), and a pipe (380) is installed on the inner wall of the inner wall component (310). The pipe (380) is used to drive the separation membrane (330) to rotate through the ring frame (332). A support ring (340) is snapped onto the outer wall of the inner tile (310). One end of the support ring (340) has an air inlet (341), and the other end has an air outlet (342). The air inlet (341) is aligned with pipe one (350), and the air outlet (342) is aligned with pipe three (380). The support ring (340) is located between the separation membrane (330) and the inner tile (310), and a gap cavity (331) is formed between the separation membrane (330) and the support ring (340). The drive module (370) includes a second ring frame (371), a fixed tube (373), and a reduction gearbox (375). The second ring frame (371) is rotatably connected to the inner wall of the inner tile (310). Multiple magnetic blocks are equidistantly embedded in the inner walls of the first ring frame (332) and the second ring frame (371). A bevel ring (372) is fixedly connected to the inner wall of the second ring frame (371). The fixed tube (373) is fixedly sleeved with the third pipe (380). A fan blade is rotatably connected to the top of the fixed tube (373). 374), the inner wall of the fixed pipe (373) is rotatably connected to a drive shaft (377), the top end of the drive shaft (377) is rotatably connected to the front of the fan blade (374), the bottom end of the drive shaft (377) is connected to the input end of the reduction gearbox (375), the pipe (350) is fixedly installed on the inner wall (310), and the output end of the reduction gearbox (375) is fixedly sleeved with a bevel gear (376), and the bevel gear (376) meshes with the bevel gear ring (372) for transmission.

2. The membrane separation oil and gas recovery device for oil depots according to claim 1, characterized in that, The docking unit (230) includes an outer connecting pipe (231), one end of which is fixedly connected to a valve pipe (236). The valve pipe (236) is fixedly installed with an inner sleeve (220), and the outer connecting pipe (231) is fixedly installed with an outer sleeve (210). The inner wall of the other end of the outer connecting pipe (231) and the outer wall of the other end of the pipe (260) are both provided with threaded grooves. The other end of the pipe (260) is used to screw and connect with the other end of the outer connecting pipe (231). An inner connecting pipe (232) is installed inside the docking unit (230), and one end of the inner connecting pipe (232) is used to insert into one end of the pipe (350).

3. The membrane separation oil and gas recovery device for oil depots according to claim 1, characterized in that, The inner tile (310) has a closure (312) on one side, which is used to fit and snap against the outer shell (320). The inner tile (310) has an outer retaining ring (311) that can be detachably installed on the other side.

4. A membrane separation oil and gas recovery device for oil depots according to claim 2, characterized in that, The inner wall of the inner connecting pipe (232) is slidably sleeved with a valve pipe (233). One end of the valve pipe (233) is provided with a valve hole (234), and the other end of the valve pipe (233) is fixedly connected with a limiting ring (235). The limiting ring (235) is used to abut against the pipe (350).

5. A membrane separation oil and gas recovery device for oil depots according to claim 4, characterized in that, The outer wall of the valve tube 2 (236) is provided with valve hole 2 (2361). One end of the valve tube 1 (233) is fixedly connected to a shaft (237). Two valve plates (2371) are fixedly installed at one end of the shaft (237). The shaft (237) is slidably inserted into the inner connecting tube (232).

6. A membrane separation oil and gas recovery device for oil depots according to claim 5, characterized in that, One end of the valve tube (236) penetrates the inner wall of the inner sleeve (220), and the other end of the valve tube (236) is connected to the inside of the outer sleeve (210).

7. A membrane separation oil and gas recovery device for oil depots according to claim 1, characterized in that, The top of the liquid collection tank (150) is fixedly connected to a return gas pipe (151), and one end of the return gas pipe (151) is fixedly connected to the air inlet pipe (111).

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