A skid-mounted natural gas helium extraction device

Abstract

The utility model discloses a kind of skid-mounted natural gas helium extraction devices, including outer skid seat and respectively install on outer skid seat natural gas main pipe, controller, helium ionization detector, pressure swing adsorption module, membrane separation module, natural gas inlet pipe and gas distribution pipe group;The output end of the natural gas main pipe is divided into two ways, one way passes through natural gas inlet pipe and pressure swing adsorption module intercommunication;Another road is communicated with membrane separation module through gas distribution pipe group;The helium ionization detector is also communicated with the intermediate section of natural gas main pipe;Electromagnetic valve is set on the natural gas inlet pipe;Intake pump is set between the natural gas main pipe and gas distribution pipe group;The controller is respectively connected with helium ionization detector, electromagnetic valve and intake pump signal connection.The utility model realizes for different concentration of helium-containing natural gas's helium extraction processing and collection, improves natural gas helium extraction processing precision, and practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of natural gas helium extraction equipment technology, specifically a skid-mounted natural gas helium extraction device. Background Technology

[0002] Helium is widely used in various fields, such as high-end manufacturing, due to its low density, inertness, high thermal conductivity, and stability at extremely low temperatures. Because helium is present in very low concentrations in the air and has stable chemical properties, it is difficult to produce using chemical methods. Therefore, natural gas helium extraction is the primary source of helium. Natural gas helium extraction technology refers to the process technology for separating and purifying helium from helium-containing natural gas.

[0003] Currently, natural gas helium extraction units often only have a single helium extraction processing mechanism, which has poor functionality; it is difficult to meet the needs of natural gas with different helium concentrations, making it difficult to achieve precise helium extraction processing.

[0004] Therefore, developing a highly efficient and precise helium extraction device for different natural gas sources is currently a research topic. Utility Model Content

[0005] The purpose of this invention is to provide a skid-mounted natural gas helium extraction device to solve the problems mentioned in the background art.

[0006] This utility model discloses a skid-mounted natural gas helium extraction device. By setting up a helium ionization detector to detect the helium concentration in natural gas, the controller controls the opening and closing of the solenoid valve and intake pump set on the natural gas intake pipe according to the detection result of the helium concentration. In turn, it controls the conduction and closing of the pressure swing adsorption module or membrane separation module, so as to achieve efficient and accurate helium extraction from different natural gas sources and has good flexibility.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A skid-mounted natural gas helium extraction device includes an outer skid base and a natural gas main pipe, a controller, a helium ionization detector, a pressure swing adsorption module, a membrane separation module, a natural gas inlet pipe, and a gas distribution pipe assembly, all of which are respectively installed on the outer skid base.

[0009] The output end of the natural gas main is divided into two paths: one path is connected to the natural gas inlet pipe and the pressure swing adsorption module; the other path is connected to the membrane separation module through the gas distribution pipe group; the helium ionization detector is also connected to the middle section of the natural gas main.

[0010] A solenoid valve is installed on the natural gas inlet pipe; an inlet pump is installed between the natural gas main pipe and the gas distribution pipe group; the controller is connected to the helium ionization detector, the solenoid valve and the inlet pump respectively.

[0011] Further specifying, the pressure swing adsorption module includes an adsorption tower and a high-pressure control tank, a first helium collection tank, and a first heavy gas recovery tank, which are respectively connected to the adsorption tower; the natural gas inlet pipe is connected to the high-pressure control tank.

[0012] Further specifying, the pressure swing adsorption module also includes a high-pressure regulating pipe, a helium collection pipe, and a first heavy gas recovery pipe; the adsorption tower is connected to the high-pressure control tank via the high-pressure regulating pipe; the adsorption tower is connected to the first helium collection tank via the helium collection pipe; and the adsorption tower is connected to the first heavy gas recovery tank via the first heavy gas recovery pipe.

[0013] Further specified, solenoid valves are installed on both the high-pressure regulating pipe and the helium collection pipe; a vacuum pump is installed on the first heavy gas recovery pipe; and both the solenoid valves and the vacuum pump are electrically connected to the controller.

[0014] Furthermore, the air intake pump, the air extraction pump, and the high-pressure regulating pipe are all equipped with air pressure sensors; and the air pressure sensors are all connected to the controller.

[0015] Further specifying, the membrane separation module includes a polymer membrane separation box and a second helium collection tank and a second heavy gas recovery tank respectively connected to the polymer membrane separation box; the gas distribution pipe assembly is connected to the polymer membrane separation box.

[0016] Furthermore, the gas distribution pipe assembly is also equipped with a flow control valve, which is electrically connected to the controller.

[0017] Further specifying, the membrane separation module also includes a helium collection pipe assembly and a second heavy gas recovery pipe assembly; the polymer membrane separation box is connected to the second helium collection tank via the helium collection pipe assembly; the polymer membrane separation box is also connected to the second heavy gas recovery tank via the second heavy gas recovery pipe assembly.

[0018] Furthermore, both the second heavy gas recovery pipe and the helium collection pipe assembly are equipped with solenoid valves, and the solenoid valves are electrically connected to the controller.

[0019] Further specified, there are multiple polymer membrane separation boxes, gas distribution pipe groups, helium collection pipe groups, and second heavy gas recovery pipe fittings; one end of each of the multiple gas distribution pipe groups, one end of each of the multiple helium collection pipe groups, and one end of each of the multiple second heavy gas recovery pipe fittings are connected to the multiple polymer membrane separation boxes one-to-one; the other end of each of the multiple gas distribution pipe groups is connected to the natural gas main pipeline; the other end of each of the multiple helium collection pipe groups is connected to the second helium collection tank; and the other end of each of the multiple second heavy gas recovery pipe fittings is connected to the second heavy gas recovery tank.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This skid-mounted natural gas helium extraction device detects the helium concentration in natural gas using a helium ionization detector. The controller, based on the helium concentration detection results, controls the opening and closing of the solenoid valve and intake pump on the natural gas inlet pipe, thereby controlling the on / off state of the pressure swing adsorption (PSA) module or membrane separation module. Specifically, when the helium concentration is high, the PSA module is used for adsorption and helium extraction; when the helium concentration is low, the helium enters the membrane separation module for separation and helium extraction, achieving efficient and precise helium extraction from different natural gas sources with good flexibility.

[0022] 2. The pressure swing adsorption (PSA) module includes an adsorption tower and a high-pressure control tank, a first helium collection tank, and a first heavy gas recovery tank, all connected to the adsorption tower. The natural gas inlet pipe is connected to the high-pressure control tank. High-concentration natural gas is first pressurized in the high-pressure control tank before entering the adsorption tower. It preferentially adsorbs gases with larger molecular weights, such as methane, carbon dioxide, and nitrogen. Helium, due to its small molecular size and weak adsorption capacity, is separated as a product gas. The separated helium enters the first helium collection tank, which has been pre-vacuumed, through a helium collection pipe, achieving helium extraction through adsorption. The structure is simple and the operation is convenient.

[0023] 3. In this utility model, after the helium extraction in the adsorption tower is completed, the internal pressure of the adsorption tower is reduced by a vacuum pump, and the adsorbed heavy gas is desorbed and discharged into the first heavy gas recovery tank. This not only realizes the collection of heavy gas, but also desorbs and regenerates the molecular sieve adsorption layer, realizes recycling, improves the service life of the adsorption tower, and improves the adsorption effect.

[0024] 4. In this invention, the membrane separation module includes a polymer membrane separation box and a second helium collection tank and a second heavy gas recovery tank, both connected to the polymer membrane separation box; the gas distribution pipe assembly is connected to the polymer membrane separation box. Low-concentration natural gas enters the polymer membrane separation box, where helium preferentially permeates through the membrane module inside the box to the permeate side, while heavy gases such as methane remain on the feed side, thus achieving helium extraction from the natural gas. Separation via the polymer membrane separation box improves the separation efficiency.

[0025] 5. This utility model achieves a high degree of integration of helium concentration detection, helium adsorption and separation by assembling a helium ionization detector, a pressure swing adsorption module and a membrane separation module on an external skid mount, thus optimizing the structure and functionality of the device; at the same time, each structural component is detachably installed from the external skid mount, which facilitates flexible disassembly and maintenance. Attached Figure Description

[0026] Figure 1 This is a front view structural diagram of the present invention;

[0027] Figure 2This is a side view of the structure of this utility model;

[0028] Figure 3 This is a partial cross-sectional view of the pressure swing adsorption module of this utility model.

[0029] Figure 4 This is a partial cross-sectional view of the membrane separation module of this utility model.

[0030] Figure 5 This is a front view structural diagram of the polymer membrane separation box of this utility model.

[0031] In the picture:

[0032] 1. Pressure Swing Adsorption Module; 2. Membrane Separation Module; 3. External Skid Mount; 4. Controller; 5. Detection Port; 6. Helium Ionization Detector; 7. Helium Collection Pipeline; 8. Pump; 9. First Heavy Gas Recovery Pipeline; 10. First Heavy Gas Recovery Tank; 11. Adsorption Tower; 12. High Pressure Regulating Pipe; 13. High Pressure Control Tank; 14. Natural Gas Inlet Pipe; 15. First Helium Collection Tank; 16. Polymer Membrane Separation Box; 17. Second Helium Collection Tank; 18. Second Heavy Gas Recovery Tank; 19. Solenoid Valve; 20. Helium Collection Pipeline Assembly; 21. Inlet Pump; 22. Pressure Sensor; 23. Gas Distribution Pipeline Assembly; 24. Flow Control Valve; 25. Second Heavy Gas Recovery Pipeline. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] Please see Figure 1-5 One embodiment of this utility model is a skid-mounted natural gas helium extraction device, which includes an outer skid 3 and a natural gas main pipe, a controller 4, a helium ionization detector 6, a pressure swing adsorption module 1, a membrane separation module 2, a natural gas inlet pipe 14, and a gas distribution pipe group 23, which are respectively installed on the outer skid 3.

[0035] The output end of the natural gas main is divided into two paths. One path is connected to the pressure swing adsorption module 1 via the natural gas inlet pipe 14; the other path is connected to the membrane separation module 2 via the gas distribution pipe group 23; the helium ionization detector 6 is also connected to the middle section of the natural gas main.

[0036] A solenoid valve 19 is installed on the natural gas inlet pipe 14; an inlet pump 21 is installed between the natural gas main pipe and the gas distribution pipe group 23; the controller 4 is connected to the helium ionization detector 6, the solenoid valve 19 and the inlet pump 21 respectively.

[0037] Preferably, a controller 4 and a helium ionization detector 6 are sequentially installed on the outer side wall of the outer skid mount 3, and a pressure swing adsorption module 1 and a membrane separation module 2 are sequentially fixed inside the outer skid mount 3; a handle is provided on the top of both the pressure swing adsorption module 1 and the membrane separation module 2, and a disassembly and installation structure is formed between the pressure swing adsorption module 1 and the membrane separation module 2 and the outer skid mount 3; a locking post is provided at the bottom of both the pressure swing adsorption module 1 and the membrane separation module 2 to engage with the outer skid mount 3.

[0038] The helium ionization detector 6 is equipped with a detection port 5; a detection branch pipe is connected to the middle section of the natural gas main pipe. The natural gas main pipe is connected to the helium ionization detector 6 through the detection branch pipe and the detection port 5. Since the detection branch pipe is located at the front end of the natural gas inlet pipe 14 and the gas distribution pipe group 23, after the natural gas enters the natural gas main pipe, it first passes through the detection branch pipe so that the natural gas enters the helium ionization detector 6 through the detection port 5, detects the helium concentration in the natural gas, and feeds back the helium concentration to the controller 4. The controller 4 controls the opening of the solenoid valve 19 on the natural gas inlet pipe 14 and the solenoid valve 19 on the gas distribution pipe group 23 according to the helium concentration.

[0039] When the detected helium concentration is greater than 0.5%, indicating a high concentration of natural gas, the solenoid valve 19 on the natural gas inlet pipe 14 opens, while the solenoid valve 19 on the gas distribution pipe assembly 23 closes. The natural gas in the main natural gas pipe enters the pressure swing adsorption module 1 through the natural gas inlet pipe 14, where it is purified and collected by pressure swing adsorption. Conversely, when the detected helium concentration is less than or equal to 0.5%, indicating a low concentration of natural gas, the solenoid valve 19 on the natural gas inlet pipe 14 closes, while the solenoid valve 19 on the gas distribution pipe assembly 23 opens. The natural gas in the main natural gas pipe enters the membrane separation module 2 through the gas distribution pipe assembly 23, where it is purified and collected by membrane separation.

[0040] Another embodiment of the present invention is provided: the pressure swing adsorption module 1 includes an adsorption tower 11 and a high-pressure control tank 13, a first helium collection tank 15 and a first heavy gas recovery tank 10, which are respectively connected to the adsorption tower 11; the natural gas inlet pipe 14 is connected to the high-pressure control tank 13.

[0041] In this embodiment, the pressure swing adsorption module 1 further includes a high-pressure regulating pipe 12, a helium collection pipe 7, and a first heavy gas recovery pipe 9; the adsorption tower 11 is connected to the high-pressure regulating tank 13 through the high-pressure regulating pipe 12; the adsorption tower 11 is connected to the first helium collection tank 15 through the helium collection pipe 7; and the adsorption tower 11 is connected to the first heavy gas recovery tank 10 through the first heavy gas recovery pipe 9.

[0042] In this embodiment, the top of the high-pressure regulating tank 13 is connected to the natural gas inlet pipe 14, facilitating the entry of natural gas with a helium concentration greater than 0.5% into the high-pressure regulating tank 13. The adsorption tower 11 has a uniformly arranged molecular sieve adsorption layer inside. Natural gas from the high-pressure regulating tank 13 enters the adsorption tower 11 through the high-pressure regulating pipe 12, and after passing through the molecular sieve adsorption layer, the gas with larger molecular weights is adsorbed by the molecular sieve adsorption layer, separating the helium. The helium is then collected into the first helium collection tank 15 using the helium collection pipe 7, completing the helium extraction process.

[0043] In this embodiment, solenoid valves 19 are installed on the high-pressure regulating pipe 12 and the helium collection pipe 7; both solenoid valves 19 are electrically connected to the controller 4. Based on the operating status of the pressure swing adsorption module 1, the controller 4 controls the opening or closing of the solenoid valves 19 on the high-pressure regulating pipe 12 and the helium collection pipe 7.

[0044] In this embodiment, a vacuum pump 8 is installed on the first heavy gas recovery pipe fitting 9; the vacuum pump 8 is electrically connected to the controller 4. According to the operating requirements of the pressure swing adsorption module 1, the vacuum pump 8 is turned on or off by the controller 4. When the vacuum pump 8 is turned off, the pressure swing adsorption module 1 is in the adsorption stage; when the adsorption is completed, the vacuum pump 8 is turned on to desorb the molecular sieve adsorption layer in the adsorption tower 11.

[0045] In this embodiment, both the air pump 8 and the high-pressure regulating pipe 12 are equipped with air pressure sensors 22; the air pressure sensors 22 are connected to the controller 4. The monitored air pressure data signals are transmitted to the controller 4.

[0046] Preferably, the first helium collection tank 15, the high-pressure control tank 13, the adsorption tower 11 and the first heavy gas recovery tank 10 are connected to the pressure swing adsorption module 1 by screws to form a disassembly and installation structure.

[0047] In use, for natural gas sources with a detected helium concentration greater than 0.5%, which is considered a high concentration, the helium-containing natural gas first enters the high-pressure regulating tank 13 to adjust the pressure to achieve high pressure. The high-pressure parameters are designed based on the requirements of stable process operation and adsorption in the adsorption tower 11, and are not limited here. The high-pressure natural gas enters the adsorption tower 11 through the high-pressure regulating pipe 12. The molecular sieve adsorption layer inside the adsorption tower 11 preferentially adsorbs gases with larger molecular weights, such as heavy gases like methane, carbon dioxide, and nitrogen. Helium, due to its small molecular size and weak adsorption capacity, is separated as a product gas. The separated helium enters the first helium collection tank 15, which has been pre-vacuumed, through the helium collection pipe 7. Finally, the pressure inside the adsorption tower 11 is reduced by the vacuum pump 8, and the adsorbed gases with larger molecular weights are desorbed and discharged from the adsorption tower 11. They are then drawn into the first heavy gas recovery tank 10 through the first heavy gas recovery pipe 9. This embodiment not only achieves the classified adsorption and collection of gases with different molecular weights in natural gas, but also facilitates the desorption of the molecular sieve adsorption layer, i.e., desorption and regeneration of the molecular sieve adsorption layer, realizing the recycling of the molecular sieve adsorption layer.

[0048] Another embodiment of the present invention is provided: the membrane separation module 2 includes a polymer membrane separation box 16 and a second helium gas collection tank 17 and a second heavy gas recovery tank 18 respectively connected to the polymer membrane separation box 16; the gas distribution pipe group 23 is connected to the polymer membrane separation box 16.

[0049] Preferably, the polymer membrane separation box 16, the second helium collection tank 17, the second heavy gas recovery tank 18, and the membrane separation module 2 are all connected by screws to form a disassembly and installation structure.

[0050] Preferably, an intake pump 21 is installed between the gas distribution pipe group 23 and the natural gas main pipe; the intake pump 21 is connected to the controller 4, and the controller 4 controls the start and stop of the intake pump 21. When natural gas enters the membrane separation module 2, the intake pump 21 starts and draws the natural gas in the natural gas main pipe into the polymer membrane separation box 16 through the gas distribution pipe group 23 for helium extraction.

[0051] Preferably, a pressure sensor 22 is also installed on the air intake pump 21. The pressure sensor 22 monitors the pressure of the natural gas entering the gas distribution pipe assembly 23.

[0052] Preferably, a flow control valve 24 is also provided at one end of the gas distribution pipe assembly 23 near the polymer membrane separation box 16. The flow control valve 24 is connected to the controller 4, which facilitates the regulation of the flow rate of natural gas entering the polymer membrane separation box 16 and optimizes the subsequent membrane separation effect.

[0053] In this embodiment, a membrane module is installed in the middle of the interior of the polymer membrane separation box 16 using screws; the membrane module separates the natural gas entering the polymer membrane separation box 16. The membrane module is a polymer membrane module, and its function is to separate helium and heavy gases; the specific material selection for the polymer membrane module is not limited here.

[0054] In this embodiment, the membrane separation module 2 further includes a helium collection tube assembly 20 and a second heavy gas recovery tube assembly 25; the polymer membrane separation box 16 is connected to the helium collection tube assembly 20 and the second helium collection tank 17; the polymer membrane separation box 16 is also connected to the second heavy gas recovery tank 18 through the second heavy gas recovery tube assembly 25.

[0055] Preferably, both the second heavy gas recovery pipe fitting 25 and the helium collection pipe assembly 20 are equipped with solenoid valves 19, and the solenoid valves 19 are electrically connected to the controller 4. Depending on the operation of the membrane separation module 2, the controller 4 controls the opening or closing of the solenoid valves 19 on the second heavy gas recovery pipe fitting 25 and the helium collection pipe assembly 20.

[0056] In this embodiment, to improve separation efficiency, multiple polymer membrane separation boxes 16 are arranged in parallel. Correspondingly, there are multiple gas distribution pipe groups 23, helium collection pipe groups 20, and second heavy gas recovery pipes 25. One end of each gas distribution pipe group 23 is connected to the natural gas main pipe through an air intake pump 21, and the other end of each gas distribution pipe group 23 is connected to one polymer membrane separation box 16. One end of each helium collection pipe group 20 is connected to the second helium collection tank 17, and the other end of each helium collection pipe group 20 is connected to one polymer membrane separation box 16. One end of each second heavy gas recovery pipe 25 is connected to the second heavy gas recovery tank 18, and the other end of each second heavy gas recovery pipe 25 is connected to one polymer membrane separation box 16.

[0057] In practice, the more polymer membrane separation boxes 16 there are, the better the separation effect. For example, there may be three, four, five or more polymer membrane separation boxes 16. The specific number is designed according to the actual helium extraction target and is not limited here.

[0058] In use, for natural gas sources where the detected helium concentration is less than or equal to 0.5% and is in a low concentration state, the natural gas, driven by the pressure of the intake pump 21, enters the three corresponding polymer membrane separation boxes 16 sequentially from the natural gas main pipe through the gas distribution pipe group 23. Then, the helium in the natural gas preferentially passes through the membrane module inside the polymer membrane separation box 16 into the permeate side (i.e., the side opposite to the natural gas intake), while heavy gases such as methane remain on the feed side (i.e., the natural gas intake side), thus realizing the separation and helium extraction of natural gas. Then, the heavy gases such as methane in each polymer membrane separation box 16 are collected in the second heavy gas recovery tank 18 through the second heavy gas recovery pipe fitting 25, and the helium is collected in the second helium collection tank 17 through the helium collection pipe group 20.

[0059] It should be noted that the various tanks, towers, pipe assemblies, fittings, pumps, solenoid valves, and pressure sensors used in the above embodiments are all conventional chemical equipment in the field, and all meet the pressure and corrosion requirements of natural gas and helium for chemical equipment.

[0060] It should be noted that the controller used in the above embodiments is a PLC controller, which is a commercially available product commonly used in the chemical industry, such as a Siemens PLC controller.

[0061] This invention integrates a detection module and two helium extraction processing modules by assembling a helium ionization detector 6, a pressure swing adsorption module 1, and a membrane separation module 2 on an outer skid mount 3. The modular assembly of the various modules enhances functionality and facilitates flexible disassembly and maintenance.

[0062] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A skid-mounted natural gas helium extraction device, characterized in that, The system includes an external skid mount (3) and a natural gas main pipe, a controller (4), a helium ionization detector (6), a pressure swing adsorption module (1), a membrane separation module (2), a natural gas inlet pipe (14), and a gas distribution pipe group (23) respectively installed on the external skid mount (3); the output end of the natural gas main pipe is divided into two paths, one path is connected to the pressure swing adsorption module (1) through the natural gas inlet pipe (14), and the other path is connected to the membrane separation module (2) through the gas distribution pipe group (23); the helium ionization detector (6) is also connected to the middle section of the natural gas main pipe; a solenoid valve (19) is installed on the natural gas inlet pipe (14); an intake pump (21) is installed between the natural gas main pipe and the gas distribution pipe group (23); the controller (4) is connected to the helium ionization detector (6), the solenoid valve (19), and the intake pump (21) respectively.

2. The skid-mounted natural gas helium extraction device according to claim 1, characterized in that, The pressure swing adsorption module (1) includes an adsorption tower (11) and a high-pressure control tank (13), a first helium collection tank (15) and a first heavy gas recovery tank (10) respectively connected to the adsorption tower (11); the natural gas inlet pipe (14) is connected to the high-pressure control tank (13).

3. The skid-mounted natural gas helium extraction device according to claim 2, characterized in that, The pressure swing adsorption module (1) further includes a high-pressure regulating pipe (12), a helium collection pipe (7), and a first heavy gas recovery pipe (9); the adsorption tower (11) is connected to the high-pressure regulating tank (13) through the high-pressure regulating pipe (12); the adsorption tower (11) is connected to the first helium collection tank (15) through the helium collection pipe (7); the adsorption tower (11) is connected to the first heavy gas recovery tank (10) through the first heavy gas recovery pipe (9).

4. The skid-mounted natural gas helium extraction device according to claim 3, characterized in that, Solenoid valves (19) are installed on both the high-pressure regulating pipe (12) and the helium collection pipe (7); a vacuum pump (8) is installed on the first heavy gas recovery pipe (9); both the solenoid valves (19) and the vacuum pump (8) are electrically connected to the controller (4).

5. The skid-mounted natural gas helium extraction device according to claim 4, characterized in that, Pressure sensors (22) are installed on the air intake pump (21), the air extraction pump (8), and the high pressure regulating pipe (12); the pressure sensors (22) are all connected to the controller (4).

6. The skid-mounted natural gas helium extraction device according to any one of claims 1-5, characterized in that, The membrane separation module (2) includes a polymer membrane separation box (16) and a second helium collection tank (17) and a second heavy gas recovery tank (18) respectively connected to the polymer membrane separation box (16); the gas distribution pipe group (23) is connected to the polymer membrane separation box (16).

7. The skid-mounted natural gas helium extraction device according to claim 6, characterized in that, The gas distribution pipe assembly (23) is also equipped with a flow control valve (24), which is electrically connected to the controller (4).

8. The skid-mounted natural gas helium extraction device according to claim 7, characterized in that, The membrane separation module (2) further includes a helium collection tube assembly (20) and a second heavy gas recovery tube assembly (25); the polymer membrane separation box (16) is connected to the helium collection tube assembly (20) and the second helium collection tank (17); the polymer membrane separation box (16) is also connected to the second heavy gas recovery tank (18) through the second heavy gas recovery tube assembly (25).

9. The skid-mounted natural gas helium extraction device according to claim 8, characterized in that, Solenoid valves (19) are installed on both the second heavy gas recovery pipe fitting (25) and the helium collection pipe assembly (20), and the solenoid valves (19) are electrically connected to the controller (4).

10. The skid-mounted natural gas helium extraction device according to claim 9, characterized in that, The polymer membrane separation box (16), gas distribution pipe group (23), helium collection pipe group (20), and second heavy gas recovery pipe (25) are all multiple; one end of each of the multiple gas distribution pipe groups (23), one end of each of the multiple helium collection pipe groups (20), and one end of each of the multiple second heavy gas recovery pipe (25) are connected to the multiple polymer membrane separation boxes (16) one by one; the other end of each of the multiple gas distribution pipe groups (23) is connected to the natural gas main pipe; the other end of each of the multiple helium collection pipe groups (20) is connected to the second helium collection tank (17); and the other end of each of the multiple second heavy gas recovery pipe (25) is connected to the second heavy gas recovery tank (18).

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