Oil gas treatment nitrogen recovery device based on membrane separation technology

Abstract

The utility model relates to the related technical field of nitrogen recovery, in particular to an oil gas treatment nitrogen recovery device based on a membrane separation technology, which comprises a shell, a first cover plate and a second cover plate are respectively and rotatably mounted at two ends of the shell, and a gas inlet and a gas outlet are respectively formed in the first cover plate and the second cover plate. The membrane separation assembly is arranged in the shell; according to the membrane separation device, the elastic plugging piece is arranged between the membrane separation assembly and the gas outlet, so that when the membrane separation efficiency of the membrane separation assembly is reduced and the impurity gas in the shell is not completely discharged, the elastic plugging piece is extruded by increasing the gas pressure in the shell, and the membrane separation efficiency of the membrane separation assembly is improved; and the elastic plugging piece deforms to plug the gas outlet, so that nitrogen in the shell cannot be discharged temporarily, and the purity of the nitrogen discharged from the gas outlet is improved while most of impurity gas in the shell is separated and discharged cleanly.

Description

Technical Field

[0001] The utility model relates to the technical field related to nitrogen recovery, in particular to an oil and gas treatment nitrogen recovery device based on membrane separation technology. Background Art

[0002] Nitrogen plays a key role in various industries, particularly in oil and gas recovery platforms. Nitrogen is primarily used as an inert gas to reduce the presence of oxygen, prevent adverse reactions such as oil oxidation, acidification, and deterioration, and improve oil quality. Due to the extremely high purity requirements for nitrogen (typically greater than 99.99%), used nitrogen often contains a certain amount of nitrogen. By recovering this waste nitrogen, it can be reused, thereby reducing production costs.

[0003] Currently, there are various methods for nitrogen recovery. Depending on different application scenarios and needs, the following different methods can be adopted. When membrane separation technology is used, different components in the gas are separated by using a separation membrane, and then the nitrogen is compressed to a certain degree again by using the pressure difference before being reused. However, when the separation efficiency of the separation membrane is reduced, some impurity gases in the gas are not separated out, resulting in a reduction in the purity of the recovered nitrogen and failing to achieve the expected separation effect. Utility Model Content

[0004] The purpose of the utility model is to provide an oil and gas treatment nitrogen recovery device based on membrane separation technology to solve the problems raised in the above background technology.

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

[0006] An oil and gas processing nitrogen recovery device based on membrane separation technology includes a housing, a first cover plate and a second cover plate rotatably mounted on both ends of the housing, an air inlet and an air outlet formed on the first cover plate and the second cover plate, respectively, and a membrane separation assembly disposed within the housing;

[0007] An elastic sealing member is provided between the membrane separation assembly and the gas outlet. If the gas in the shell is not discharged in time, the pressure in the shell increases, thereby controlling the elastic sealing member to seal the gas outlet.

[0008] The oil and gas processing nitrogen recovery device based on membrane separation technology as described above: the shell is formed with an air guide hole communicating with the inner side.

[0009] The oil and gas processing nitrogen recovery device based on membrane separation technology as described above: the membrane separation component includes an isolation plate and a second sleeve sealed to the inner wall of the shell, and a first separation member, a second separation member and a third separation member are arranged between the isolation plate and the second sleeve.

[0010] As described above, the oil and gas processing nitrogen recovery device based on membrane separation technology: the first separation element includes a plurality of first membrane tubes distributed along the circumference, one end of the first membrane tube passes through the isolation plate, and the other end is connected to the inner side of the second casing.

[0011] The oil and gas processing nitrogen recovery device based on membrane separation technology as described above: the second separation element includes a first casing arranged along the axial direction of the shell, the first casing is connected to the isolation plate, and a plurality of second membrane tubes distributed along the circumference are arranged between the first casing and the second casing, one end of the second membrane tube is connected to the inner side of the first casing, and the other end is connected to the inner side of the second casing.

[0012] The oil and gas processing nitrogen recovery device based on membrane separation technology as described above: the third separation element includes a connecting sleeve arranged along the axial direction of the shell, and a plurality of third membrane tubes distributed along the circumference are arranged between the connecting sleeve and the first sleeve. One end of the third membrane tube is connected to the inner side of the first sleeve, and the other end is connected to the inner side of the connecting sleeve.

[0013] As described above, in the oil and gas processing nitrogen recovery device based on membrane separation technology, a conduit is axially arranged in the shell, one end of the conduit is connected to the connecting sleeve, and the other end is connected to the gas outlet.

[0014] The oil and gas processing nitrogen recovery device based on membrane separation technology as described above: the elastic sealing member includes an extrusion block arranged axially along the conduit, one end of the extrusion block being slidably connected to the inner wall of the conduit, and the other end of the extrusion block having an abutting surface arranged in a conical structure, the abutting surface being adapted to fit with a sealing ring on the inner wall of the conduit;

[0015] It also includes a spring, one end of which abuts against the extrusion block, and the other end of which abuts against a limiting ring arranged along the axial direction of the air outlet.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The elastic sealing piece arranged between the membrane separation component and the air outlet can, when the membrane separation efficiency of the membrane separation component decreases and the impurity gas in the shell is not completely discharged, squeeze the elastic sealing piece through the increase of air pressure in the shell, causing the elastic sealing piece to deform and seal the air outlet, so that the nitrogen in the shell cannot be discharged temporarily, thereby ensuring that most of the impurity gas in the shell is separated and discharged cleanly, while improving the purity of the nitrogen discharged from the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the oil and gas processing nitrogen recovery device based on membrane separation technology.

[0019] Figure 2 This is a structural schematic diagram from another angle of the oil and gas processing nitrogen recovery device based on membrane separation technology.

[0020] Figure 3 This is a schematic diagram of the structure inside the shell of an oil and gas processing nitrogen recovery device based on membrane separation technology.

[0021] Figure 4 This is a schematic cross-sectional view of the shell of an oil and gas processing nitrogen recovery device based on membrane separation technology.

[0022] Figure 5 This is a schematic diagram of the structure of the membrane separation component in the oil and gas processing nitrogen recovery device based on membrane separation technology.

[0023] Figure 6 This is a schematic diagram of the structure of the membrane separation component and elastic sealing parts in the oil and gas processing nitrogen recovery device based on membrane separation technology.

[0024] Figure 7 This is a schematic diagram of the structure of the elastic sealing component in the oil and gas processing nitrogen recovery device based on membrane separation technology.

[0025] In the figure: 1. Shell; 101. Air guide hole; 2. First cover plate; 201. Air inlet; 3. Second cover plate; 301. Air outlet; 4. Isolation plate; 5. First sleeve; 6. Second sleeve; 7. Connecting sleeve; 8. First membrane tube; 9. Second membrane tube; 10. Third membrane tube; 11. Conduit; 1101. Strip groove; 12. Limiting ring; 13. Extrusion block; 1301. Strip block; 14. Spring; 15. Sealing ring. DETAILED DESCRIPTION

[0026] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0027] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0028] In addition, numerous specific details are provided in the following specific examples to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, and components well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0029] See also Figures 1 to 7In an embodiment of the present invention, an oil and gas processing nitrogen recovery device based on membrane separation technology includes a shell 1, a first cover plate 2, a second cover plate 3, an air inlet 201, an air outlet 301, a membrane separation component and an elastic sealing member.

[0030] For details, please refer to Figure 1 、 Figure 6 ,include;

[0031] A housing 1, wherein a first cover plate 2 and a second cover plate 3 are rotatably mounted on both ends of the housing 1, wherein an air inlet 201 and an air outlet 301 are formed on the first cover plate 2 and the second cover plate 3, respectively, and further comprising a membrane separation assembly disposed within the housing 1;

[0032] The elastic sealing member is provided between the membrane separation assembly and the gas outlet 301 . If the gas in the shell 1 is not discharged in time, the pressure in the shell 1 increases, thereby controlling the elastic sealing member to seal the gas outlet 301 .

[0033] Specifically, in this embodiment, the oil and gas processing nitrogen recovery device based on membrane separation technology described in the present invention is used. When in use, the gas containing oil and water obtained during surface extraction of the oil field is filtered to remove the oil. The remaining gas is then compressed and delivered to the housing 1 through the air inlet 201. Under the action of the membrane separation assembly, due to the low permeability of nitrogen, impurities such as water vapor, oxygen, carbon dioxide, and inert gases (hereinafter referred to as impurity gases) contained in the gas are first discharged from the housing 1. The remaining nitrogen is discharged to the recovery tank through the air outlet 301. If the membrane separation efficiency of the membrane separation assembly decreases, resulting in incomplete discharge of the impurity gases in the housing 1, the air pressure in the housing 1 increases, thereby squeezing the elastic sealing member, causing the elastic sealing member to deform and block the air outlet 301, temporarily preventing the discharge of the nitrogen in the housing 1. This ensures that most of the impurity gases in the housing 1 are separated and discharged cleanly, while improving the purity of the nitrogen discharged from the air outlet 301.

[0034] Preferably, an air guide hole 101 communicating with the inner side is formed on the shell 1 , so that the impurity gas in the shell 1 is discharged to the outside through the air guide hole 101 .

[0035] As a further solution to this problem, please refer to Figure 4 and Figure 5 The membrane separation assembly includes an isolation plate 4 and a second sleeve 6 sealed to the inner wall of the shell 1, and a first separation member, a second separation member and a third separation member are arranged between the isolation plate 4 and the second sleeve 6.

[0036] The first separation element includes a plurality of first membrane tubes 8 distributed along the circumference. One end of the first membrane tube 8 passes through the isolation plate 4 , and the other end is connected to the inner side of the second sleeve 6 .

[0037] The second separator includes a first sleeve 5 axially arranged along the shell 1, the first sleeve 5 is connected to the isolation plate 4, and a plurality of second membrane tubes 9 distributed along the circumference are arranged between the first sleeve 5 and the second sleeve 6. One end of the second membrane tube 9 is connected to the inner side of the first sleeve 5, and the other end is connected to the inner side of the second sleeve 6.

[0038] The third separating member includes a connecting sleeve 7 axially arranged along the shell 1 , and a plurality of third membrane tubes 10 distributed along the circumference are arranged between the connecting sleeve 7 and the first sleeve 5 , one end of the third membrane tube 10 is connected to the inner side of the first sleeve 5 , and the other end is connected to the inner side of the connecting sleeve 7 .

[0039] The first membrane tube 8, the second membrane tube 9 and the third membrane tube 10 all use hollow fiber reset membranes, and the nitrogen recovery work is completed according to the different selective permeabilities of impurity gases and nitrogen to the reset membrane. Among them, the selective permeability of nitrogen to the reset membrane is slower, so that the reset membrane discharges the separated impurity gases out of the shell 1, while the unseparated nitrogen is discharged into the recovery tank through the outlet 301.

[0040] To elaborate, the compressed gas enters the shell 1 from the air inlet 201, passes through the isolation plate 4 and enters the first membrane tube 8. Part of the impurity gas is separated by the first membrane tube 8 and discharged through the air guide hole 101. The unseparated impurity gas and nitrogen reach the second sleeve 6 and enter the second membrane tube 9. Under the action of the second membrane tube 9, part of the impurity gas is separated out, while the impurity gas and nitrogen that are not completely separated reach the first sleeve 5, pass through the first sleeve 5 and enter the third membrane tube 10. After separation by the third membrane tube 10, the remaining gas reaches the connecting sleeve 7. At this time, the impurity gas in the gas is not completely removed. The separation of the first membrane tube 8, the second membrane tube 9 and the third membrane tube 10 further improves the purity of the nitrogen discharged from the air outlet 301.

[0041] It should be noted that the diameters of the first membrane tube 8, the second membrane tube 9, and the third membrane tube 10 are inconsistent and decrease in order to ensure that as much impurity gas as possible is separated out while saving membrane tube material. Specifically, when the compressed gas first enters the first membrane tube 8, after multiple separations, the gas volume gradually decreases. When it reaches the connecting sleeve 7, only nitrogen and a small amount of residual impurity gas remain.

[0042] As a further solution to this problem, please refer to Figure 6 and Figure 7A conduit 11 is axially arranged in the shell 1 , one end of the conduit 11 is connected to the connecting sleeve 7 , and the other end is connected to the air outlet 301 .

[0043] The elastic sealing member includes an extrusion block 13 arranged axially along the conduit 11. One end of the extrusion block 13 is slidably connected to the inner wall of the conduit 11, and the other end is formed with an abutment surface with a conical structure. The abutment surface is adapted to the sealing ring 15 on the inner wall of the conduit 11.

[0044] The air outlet 301 further includes a spring 14 , one end of which abuts against the extrusion block 13 , and the other end of which abuts against a limiting ring 12 axially arranged along the air outlet 301 .

[0045] Preferably, at least one group of strip grooves 1101 is formed on the inner wall of the conduit 11, and a strip block 1301 is formed on the extrusion block 13, which slides with the strip grooves 1101. Under the restrictive action of the strip grooves 1101 and the strip block 1301, a sliding connection between the extrusion block 13 and the inner wall of the conduit 11 is achieved.

[0046] In the initial state, the spring 14 is in a compressed state. Due to the input of compressed air into the housing 1, the air pressure inside the housing 1 is greater than the external air pressure. Under the action of the compression potential energy of the spring 14, the abutting surface on the extrusion block 13 and the sealing ring 15 are in a separated state, and a gap is formed between the extrusion block 13 and the sealing ring 15, so that the separated nitrogen is discharged.

[0047] When the separation rate of the impurity gas in the shell 1 decreases, the impurity gas in the shell 1 cannot be discharged quickly, so that the pressure in the shell 1 increases. At this time, the squeezing force on the extrusion block 13 in the shell 1 is greater than the elastic force of the spring 14 itself, so that the extrusion block 13 moves toward the sealing ring 15, and the gap between the extrusion block 13 and the sealing ring 15 decreases until the abutting surface on the extrusion block 13 abuts against the sealing ring 15, so that the conduit 11 is in a blocked state, so as to ensure that most of the impurity gas in the shell 1 is separated and discharged cleanly, while improving the purity of the nitrogen discharged from the outlet 301.

[0048] 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 present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An oil and gas treatment nitrogen recovery device based on membrane separation technology, comprising a shell (1), a first cover plate (2) and a second cover plate (3) being rotatably mounted on both ends of the shell (1), an air inlet (201) and an air outlet (301) being formed on the first cover plate (2) and the second cover plate (3), respectively, and a membrane separation component arranged in the shell (1), characterized in that ； An elastic sealing member is arranged between the membrane separation component and the gas outlet (301). If the gas in the shell (1) is not discharged in time, the pressure in the shell (1) increases, thereby controlling the elastic sealing member to seal the gas outlet (301).

2. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 1 is characterized in that: An air guide hole (101) communicating with the inner side is formed on the shell (1).

3. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 1 is characterized in that: The membrane separation assembly comprises an isolation plate (4) and a second sleeve (6) sealed to the inner wall of the shell (1); a first separation member, a second separation member and a third separation member are provided between the isolation plate (4) and the second sleeve (6).

4. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 3 is characterized in that: The first separation element comprises a plurality of first membrane tubes (8) distributed along the circumference, one end of the first membrane tube (8) passes through the isolation plate (4), and the other end is communicated with the inner side of the second sleeve (6).

5. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 4 is characterized in that: The second separation element comprises a first sleeve (5) arranged axially along the shell (1), the first sleeve (5) being connected to the isolation plate (4), a plurality of second membrane tubes (9) distributed along the circumference being arranged between the first sleeve (5) and the second sleeve (6), one end of the second membrane tube (9) being in communication with the inner side of the first sleeve (5), and the other end being in communication with the inner side of the second sleeve (6).

6. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 5, characterized in that: The third separating member comprises a connecting sleeve (7) arranged axially along the shell (1), and a plurality of third membrane tubes (10) distributed along the circumference are arranged between the connecting sleeve (7) and the first sleeve (5), and one end of the third membrane tube (10) is communicated with the inner side of the first sleeve (5), and the other end is communicated with the inner side of the connecting sleeve (7).

7. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 1, characterized in that: A conduit (11) is axially arranged in the housing (1); one end of the conduit (11) is in communication with the connecting sleeve (7), and the other end is in communication with the air outlet (301).

8. The oil and gas treatment nitrogen recovery device based on membrane separation technology according to claim 7, characterized in that: The elastic sealing member comprises an extrusion block (13) arranged axially along the conduit (11), one end of the extrusion block (13) being slidably connected to the inner wall of the conduit (11), and the other end of the extrusion block (13) being formed with an abutment surface having a conical structure, the abutment surface being adapted to the sealing ring (15) on the inner wall of the conduit (11); It also includes a spring (14), one end of the spring (14) abuts against the extrusion block (13), and the other end abuts against a limiting ring (12) arranged axially along the air outlet (301).

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