A device for separating natural gas and hydrogen based on hydrate method

Abstract

The present invention relates to a technical field of separation of hydrogen and natural gas, and specifically to a device for separating natural gas and hydrogen based on a hydrate method. The device includes a plate heat exchanger, the plate heat exchanger is connected to a hydrogen-mixed natural gas pipeline, the plate heat exchanger is connected to a hydrate reactor through a pipeline, the plate heat exchanger is also connected to a propane refrigeration device, a water pipeline is connected to the hydrate reactor, the hydrate reactor is respectively connected to a hydrogen pipeline and a water-containing natural gas pipeline, the water-containing natural gas pipeline is connected to a natural gas dehydration device, the natural gas dehydration device is also connected to a dehydrated natural gas pipeline, a first natural gas pipeline is connected to the hydrate reactor, and an electric heater is provided on the first natural gas pipeline. The present invention utilizes the characteristics that hydrogen is difficult to generate hydrates, while natural gas is easy to generate hydrates under certain temperature and pressure conditions, to achieve efficient separation of hydrogen and natural gas.

Description

Technical Field

[0001] The invention relates to the technical field of separation of hydrogen and natural gas, and in particular to a device for separating natural gas and hydrogen based on a hydrate method. Background Art

[0002] Due to the particularity of hydrogen, first of all, the place where hydrogen is produced is often not the place where hydrogen is used, and hydrogen needs to be transported from the place of production to cities and other places where hydrogen is used; secondly, hydrogen has a small density and light weight, and the transportation cost is very high if a separate pipeline is built. Using natural gas pipelines to mix hydrogen for transportation is a good way to solve the high cost of hydrogen transportation. After the mixed hydrogen natural gas is transported, the separation of natural gas and hydrogen needs to be carried out at the end of the pipeline transportation.

[0003] Hydrate is a small molecule substance, an ice-like crystalline substance formed by hydrate and water under certain temperature and pressure. Due to the requirement of hydrate to form a cage structure, if the gas molecule is too small (smaller than argon molecule), it cannot play a stabilizing role in supporting the pores, and if it is too large (larger than n-butane molecule), it cannot enter the pores, and hydrates cannot be formed. Since hydrogen molecules are too small, they cannot form a hydrate cage structure with water, that is, hydrates cannot be formed.

[0004] Hydrate gas separation technology is particularly suitable for hydrogen, a gas that is difficult to separate using existing technologies. Taking advantage of the fact that hydrogen cannot exist in hydrates, the idea of ​​separating and purifying hydrogen in hydrogen-containing gases using the hydrate method is proposed: the components in the hydrogen-containing mixed gas that can form hydrates form solid hydrates, and then the gas that does not form hydrates (hydrogen-rich gas) is separated from the solid hydrates, thereby achieving the purpose of purifying hydrogen, and at the same time, the hydrates are dissolved to obtain gas that is easy to form hydrates (hydrogen-poor gas). Since the hydrogen content in hydrates is basically zero, the theoretical recovery rate of hydrogen is 100%.

[0005] Based on the above reasons, the solution of separating natural gas and hydrogen based on the hydrate method takes advantage of the fact that hydrogen is difficult to form hydrates, while natural gas is easy to form hydrates under certain temperature and pressure conditions, and can achieve 100% separation of hydrogen and natural gas.

[0006] In addition, when separating natural gas and hydrogen from hydrogen-mixed natural gas, it is necessary to cool and produce natural gas hydrates. In the process of cooling the hydrogen-mixed natural gas, the plate heat exchanger used is easily blocked by impurities in the low-temperature medium, resulting in the inability to effectively cool the hydrogen-mixed natural gas. The existing plate heat exchanger equipped with a filter device is not convenient for cleaning the filter device. After a certain period of use, the filter device needs to be replaced as a whole, which is costly. Summary of the invention

[0007] The technical problem to be solved by the present invention is: according to the characteristics of hydrogen-mixed natural gas, a relatively simple device can be used to effectively ensure the complete separation of hydrogen and natural gas. In addition, in a plate heat exchanger that uses a filter tube to filter impurities in a low-temperature medium, the inner and outer sides of the filter tube can be effectively cleaned.

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] A device for separating natural gas and hydrogen based on a hydrate method comprises a plate heat exchanger, the plate heat exchanger is connected to a hydrogen-mixed natural gas pipeline, the plate heat exchanger is connected to a hydrate reactor through a pipeline, the plate heat exchanger is also connected to a propane refrigeration device, a water pipeline is connected to the hydrate reactor, the hydrate reactor is respectively connected to a hydrogen pipeline and a water-containing natural gas pipeline, the water-containing natural gas pipeline is connected to a natural gas dehydration device, the natural gas dehydration device is also connected to a dehydrated natural gas pipeline, a first natural gas pipeline is connected to the hydrate reactor, and an electric heater is arranged on the first natural gas pipeline.

[0010] Specifically, the dehydrated natural gas pipeline is connected to the first natural gas pipeline upstream of the electric heater.

[0011] Specifically, the plate heat exchanger is provided with an inlet cavity, an outlet cavity, a mixed gas inlet cavity and a mixed gas outlet cavity, and a filtering device is provided in the inlet cavity;

[0012] The filtering device comprises a filtering tube, which is rotatably sealed and connected in the inlet cavity. A driving device is arranged in the plate heat exchanger, which drives the filtering tube to rotate in the inlet cavity. An external cleaning device for cleaning the outer edge of the filtering tube is arranged in the inlet cavity, and an internal cleaning device for cleaning the inner edge of the filtering tube is arranged in the inlet cavity.

[0013] Specifically, the external cleaning device includes an arc-shaped elastic sheet, which is in a continuous wave shape and forms multiple peaks and troughs. External bristles are fixed on the top of the troughs, and the external bristles are in contact with the outer edge of the filter tube. Both ends of the filter tube are provided with guide rings concentric therewith. The guide ring is fixed in the inlet cavity through a first fixed plate. The guide ring passes through the peaks and troughs of the elastic sheet, and the guide ring slides with the peaks and troughs of the elastic sheet. The guide rings on both sides of the elastic sheet are installed with first air drive devices, and the first air drive devices allow the elastic sheet to be driven to move on the guide rings.

[0014] Specifically, the internal cleaning device includes an arc-shaped spring piece, an outer edge of which is fixed with inner bristles, the inner bristles are in contact with the inner edge of the filter tube, connecting rods are fixed at both ends of the arc-shaped spring piece, a semicircular sliding groove is provided on the plate heat exchanger, one end of the connecting rod is slidably set in the sliding groove, and a second air drive device is provided on the plate heat exchanger. The second air drive device allows the two connecting rods to be driven to slide in the arc-shaped groove at the same time. During the sliding process of the two connecting rods in the sliding groove, the two connecting rods approach each other, the curvature of the arc-shaped spring piece increases, and the gap between the inner bristles increases.

[0015] Specifically, the plate heat exchanger also includes a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are connected by pressing bolts, the two ends of the filter tube are respectively rotatably sealed and connected to the first pressing plate and the second pressing plate of the plate heat exchanger, a plurality of cooling medium plates and a plurality of material plates are arranged between the first pressing plate and the second pressing plate, the material plates and the cooling medium plates are staggered and contact each other, the plurality of cooling medium plates and the plurality of material plates are clamped by the first pressing plate and the second pressing plate, the inlet cavity, the outlet cavity, the mixed gas inlet cavity and the mixed gas exhaust cavity all pass through the first pressing plate, the plurality of cooling medium plates and the plurality of material plates, the inlet cavity and the outlet cavity are connected with the interior of the cooling medium plate to form a cooling channel, the mixed gas inlet cavity and the mixed gas exhaust cavity are connected with the interior of the material plate to form a material channel.

[0016] Specifically, the driving device includes a gear ring fixed on the filter tube, a motor is fixed on the second pressing plate of the plate heat exchanger, a gear is fixed on the output shaft of the motor, and the gear is meshed with the gear ring.

[0017] Specifically, the first air drive device includes a second fixing plate fixed on the guide ring, and a telescopic airbag is sleeved on the guide ring between the second fixing plate and the elastic sheet, and the telescopic airbag is connected to the air pump.

[0018] Specifically, the second air drive device includes a piston rod fixed at one end of the connecting rod, the piston rod is arc-shaped, and an arc-shaped piston cavity is opened on the second clamping plate of the plate heat exchanger. The piston cavity is connected and concentric with the sliding groove. The piston rod is concentrically arranged with the piston cavity, and the piston cavity and the sliding groove form a circular guide channel. The piston rod is slidingly sealed and connected in the piston cavity. The piston cavity part between the two piston rods is connected to the gas channel on the second clamping plate, and the gas channel is connected to the gas source.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This method utilizes the fact that hydrogen is difficult to form hydrates, while natural gas is easy to form hydrates under certain temperature and pressure conditions, and can achieve efficient separation of hydrogen and natural gas. It mainly includes a gas source cooling process, a gas separation process, a heating regeneration process, and a natural gas dehydration process. This device can achieve efficient separation of hydrogen and natural gas in hydrogen-mixed natural gas.

[0021] The present invention provides a deformable elastic sheet and an arc-shaped spring sheet. When the elastic sheet is deformed, the outer bristles on the elastic sheet can increase the pressure on the outer edge of the filter tube, thereby improving the dredging effect on the filter holes on the filter tube. After the outer bristle brush increases the pressure on the outer edge of the filter tube, the outer bristles make the impurities in the filter holes of the filter cartridge move toward the inside of the filter cartridge, making it convenient to remove and discharge the impurities in the filter holes of the filter cartridge.

[0022] The inner edge of the filter tube can be cleaned simultaneously during its rotation, and the cleaning efficiency is high.

[0023] After the arc-shaped spring piece is deformed, the curvature of the arc-shaped spring piece increases, and the inner bristles of the arc-shaped spring piece are separated from the inner edge of the filter tube. At the same time, the gap between the inner bristles increases, thereby facilitating the discharge of impurities removed from the filter tube and preventing the inner bristles from hindering the discharge of impurities, thereby enabling the impurities to be completely discharged from the filter tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a three-dimensional view of the plate heat exchanger;

[0026] Figure 3 is a cross-sectional view of the inlet cavity;

[0027] Figure 4 for Figure 3 A magnified image of area A;

[0028] Figure 5 It is a schematic diagram of the coordination of the arc-shaped spring piece, the connecting rod and the piston rod;

[0029] Figure 6 is a partial cross-sectional view of a second pressing plate;

[0030] Figure 7 for Figure 6 Enlarged view of area B;

[0031] Figure 8 It is a cross-sectional view of the matching structure of the elastic sheet and the filter tube;

[0032] Fig. 9 for Figure 8 Enlarged view of the middle C area;

[0033] Fig.10 A three-dimensional view of the coordination of the elastic sheet, the guide ring and the first air drive device.

[0034] The names of the parts in the attached drawings are:

[0035] 101. Hydrogen-mixed natural gas pipeline; 102. Plate heat exchanger; 103. Hydrate reactor A; 104. Hydrate reactor B; 105. Natural gas dehydration device; 106. Hydrogen pipeline; 107. Water-containing natural gas pipeline; 108. Dehydrated natural gas pipeline; 109. First natural gas pipeline; 110. Water pipeline; 111. Propane refrigeration device; 112. Electric heater; 1. First clamping plate; 2. Cooling medium plate; 3. Second clamping plate; 4. Clamping bolts ; 5. Inlet cavity; 6. Filter tube; 7. Gear ring; 8. Gear; 9. Motor; 10. Arc-shaped spring piece; 11. Connecting rod; 12. Piston rod; 13. Sliding groove; 14. Piston cavity; 15. Gas channel; 16. Elastic sheet; 17. External bristles; 18. Guide ring; 19. First fixed plate; 20. Telescopic airbag; 21. Second fixed plate; 22. Mixed gas inlet cavity; 23. Mixed gas outlet cavity; 24. Exit cavity; 25. Wave trough; 26. Wave peak; 27. Material plate. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, a device for separating natural gas and hydrogen based on the hydrate method includes a plate heat exchanger 102. The plate heat exchanger 102 is connected to the hydrogen-mixed natural gas pipeline 101, and the plate heat exchanger 102 is connected to the hydrate reactor through a pipeline. The plate heat exchanger 102 is also connected to a propane refrigeration device 111. The water pipeline 110 is connected to the hydrate reactor, and the hydrate reactor is respectively connected to the hydrogen pipeline 106 and the water-containing natural gas pipeline 107. In this embodiment, there are two hydrate reactors, namely, hydrate reactor A103 and hydrate reactor B104. The water-containing natural gas pipeline 107 is connected to the natural gas dehydration device 105, and the natural gas dehydration device 105 is also connected to the dehydrated natural gas pipeline 108. The first natural gas pipeline 109 is connected to the hydrate reactor, and the first natural gas pipeline 109 is provided with an electric heater 112.

[0037] The dehydrated natural gas pipeline 108 is connected to the first natural gas pipeline 109 upstream of the electric heater 112 .

[0038] The hydrogen-mixed natural gas has a hydrogen molar content of 30% and a methane molar content of 70%; the gas source pressure is 3.5 MPa and the temperature is 20°C. It enters the plate heat exchanger 102 through the hydrogen-mixed natural gas pipeline 101, and the plate heat exchanger 102 exchanges the low-temperature medium with the propane refrigeration device 111 to 10°C. The cooled hydrogen-mixed natural gas enters the hydrate reactor A103 and the hydrate reactor B104, and water also enters the hydrate reactor A103 and the hydrate reactor B104 through the water pipeline 110. Water and the cooled hydrogen-mixed natural gas form natural gas hydrates. Hydrogen enters the hydrogen pipeline 106 through the top of the hydrate reactor A103 and the hydrate reactor B104. After the solid volume in the hydrate reactor A103 and the hydrate reactor B104 reaches the set volume, it enters the regeneration state. Natural gas enters the electric heater 12 through the first natural gas pipeline 109 for heating, and enters the hydrate reactor A103 and the hydrate reactor B104 after being heated to 50°C. Natural gas enters the natural gas dehydration device 105 through the water-containing natural gas pipeline 107, and after dehydration, enters the downstream pipeline through the dehydrated natural gas pipeline 108.

[0039] The first natural gas pipeline 109 may also introduce natural gas from the dehydrated natural gas pipeline 108 .

[0040] The device of the present invention mainly comprises a gas source cooling process part, a gas separation process part, a heating regeneration process part and a natural gas dehydration process part.

[0041] Gas source cooling process: mainly by using propane refrigeration process to refrigerate hydrogen-containing natural gas, the temperature reaches the temperature for natural gas to form hydrates. Gas separation process: the cooled hydrogen-containing natural gas and water enter the hydrate reactor, the natural gas generates solid hydrates, and hydrogen is separated from the top and enters the hydrogen pipeline network. When the hydrate volume in hydrate reactor A103 reaches the set capacity, it automatically switches to hydrate reactor B104 for processing. The present invention can use two hydrate reactors at the same time, or it can use two hydrate reactors intermittently. In the heating and regeneration process, heated natural gas is introduced into the hydrate reactor switched to the heating and regeneration process to promote the decomposition of natural gas hydrates, and the decomposed natural gas enters the dehydration process. In the dehydration process, the water-containing natural gas at the outlet of the heating and regeneration process enters the natural gas dehydration device, and after dehydration by adsorption, the dry natural gas enters the downstream natural gas pipeline network.

[0042] like Figure 2 and Figure 3As shown, the plate heat exchanger 102 is provided with an inlet cavity 5, an outlet cavity 24, a mixed gas inlet cavity 22 and a mixed gas exhaust cavity 23. The plate heat exchanger 102 includes a first pressing plate 1 and a second pressing plate 3, and the first pressing plate 1 and the second pressing plate 3 are connected by a clamping bolt 4. A plurality of cooling medium plates 2 and a plurality of material plates 27 are arranged between the first pressing plate 1 and the second pressing plate 3. The material plates 27 and the cooling medium plates 2 are arranged alternately and contact each other. The plurality of cooling medium plates 2 and the plurality of material plates 27 are clamped by the first pressing plate 1 and the second pressing plate 3. The inlet cavity 5, the outlet cavity 24, the mixed gas inlet cavity 22 and the mixed gas exhaust cavity 23 all penetrate the first pressing plate 1, the plurality of cooling medium plates 2 and the plurality of material plates 27. The inlet cavity 5 and the outlet cavity 24 are connected to the inside of the cooling medium plate 2 to form a cooling channel. The mixed gas inlet cavity 22 and the mixed gas exhaust cavity 23 are connected to the inside of the material plate 27 to form a material channel.

[0043] like Figure 3 and Figure 4 As shown, a filtering device is provided in the inlet cavity 5. The filtering device includes a filtering tube 6, and the two ends of the filtering tube 6 are respectively connected to the first pressing plate 1 and the second pressing plate 3 of the plate heat exchanger 102 for rotation and sealing. A driving device is provided in the plate heat exchanger 102, and the driving device drives the filtering tube 6 to rotate in the inlet cavity 5. The driving device includes a gear ring 7 fixed on the filtering tube 6, and a motor 9 is fixed on the second pressing plate 3 of the plate heat exchanger 102. A gear 8 is fixed on the output shaft of the motor 9, and the gear 8 is meshed with the gear ring 7.

[0044] An external cleaning device for cleaning the outer edge of the filter tube 6 is provided in the inlet cavity 5. An internal cleaning device for cleaning the inner edge of the filter tube 6 is provided in the inlet cavity 5.

[0045] like Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.10 As shown, the external cleaning device includes an arc-shaped elastic sheet 16. The arc-shaped elastic sheet 16 is in a continuous wave shape and forms a plurality of crests 26 and troughs 25. An outer bristle 17 is fixed on the top of the arc of the trough 25, and the outer bristle 17 contacts the outer edge of the filter tube 6. Both ends of the filter tube 6 are sleeved with a guide ring 18 concentric therewith. The guide ring 18 is fixed in the inlet cavity 5 by a first fixing plate 19, and the guide ring 18 passes through the crests 26 and troughs 25 of the elastic sheet 16, and the guide ring 18 is slidably matched with the crests 26 and troughs 25 of the elastic sheet 16. The guide ring 18 on both sides of the elastic sheet 16 is installed with a first air drive device, and the first air drive device allows the elastic sheet 16 to be driven to move on the guide ring 18. The first air drive device includes a second fixing plate 21 fixed on the guide ring 18, and a telescopic air bag 20 is sleeved on the guide ring 18 between the second fixing plate 21 and the elastic sheet 16, and the telescopic air bag 20 is connected to the air pump.

[0046] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the internal cleaning device includes an arc-shaped spring piece 10. The outer edge of the arc-shaped spring piece 10 is fixed with inner bristles, and the inner bristles are in contact with the inner edge of the filter tube 6. Connecting rods 11 are fixed at both ends of the arc-shaped spring piece 10. A semicircular sliding groove 13 is provided on the plate heat exchanger 102 inside the filter tube 6. One end of the connecting rod 11 is slidably set in the sliding groove 13. A second air drive device is provided on the plate heat exchanger 102. The second air drive device allows the two connecting rods 11 to be driven to slide in the arc-shaped groove at the same time. During the sliding process of the two connecting rods 11 in the sliding groove 13, the two connecting rods 11 approach each other, the curvature of the arc-shaped spring piece 10 increases, and the gap between the inner bristles increases. The second air drive device includes a piston rod 12 fixed at one end of the connecting rod 11, and the piston rod 12 is arc-shaped. An arc-shaped piston cavity 14 is provided on the second pressing plate 3 of the plate heat exchanger 102. The piston rod 12 is concentrically arranged with the piston cavity 14. The piston chamber 14 is connected and concentric with the sliding groove 13, and the piston chamber 14 and the sliding groove 13 form a circular guide channel. The piston rod 12 is slidingly sealed and connected in the piston chamber 14. The piston chamber 14 between the two piston rods 12 is connected to the gas channel 15 on the second clamping plate 3, and the gas channel 15 is connected to the gas source.

[0047] When the filter tube 6 needs to be cleaned, the pipeline connected to the inlet chamber 5 is removed. Then the air pump connected to the telescopic airbag 20 is started, and the telescopic airbag 20 expands after the air pump is started. During the expansion of the telescopic airbags 20 on both sides of the elastic sheet 16, the elastic sheet 16 is compressed on the guide ring 18. The crest 26 and the trough 25 of the elastic sheet 16 are deformed, and the pressure of the outer bristles 17 fixed at the arc end of the trough 25 on the outer edge of the filter tube 6 increases. Then the motor 9 is started, and the motor 9 drives the filter tube 6 to rotate. During the rotation of the filter tube 6, since the pressure of the outer bristles 17 on the outer edge of the filter tube 6 increases after the elastic sheet 16 is compressed, during the rotation of the filter tube 6, part of the outer bristles 17 can extend into the filter hole of the filter tube 6, and the outer bristles 17 can push the impurities in the filter hole of the filter tube 6 to move into the inside of the filter tube 6. During the rotation of the filter tube 6, the inner bristles on the arc-shaped spring sheet 10 can remove the impurities adhering to the inner edge of the filter tube 6. At the same time, the impurities pushed out of the filter holes of the filter tube 6 by the outer bristles 17 are caught in the gaps between the inner bristles.

[0048] After the filter tube 6 rotates for a certain period of time, the air source is turned on so that the compressed air is injected into the piston chamber 14 through the gas channel 15. Under the pressure of the compressed air, the two piston rods 12 move away from each other in the piston chamber 14. In the process of the two piston rods 12 moving away from each other, the connecting rod 11 slides in the sliding groove 13, and the two connecting rods 11 move closer to each other in the process of sliding in the sliding groove 13. In the process of the two connecting rods 11 moving in the sliding groove 13, the two connecting rods 11 drive the arc-shaped spring sheet 10 to undergo elastic deformation. In the process of the arc-shaped spring sheet 10 deforming, the inner bristles on the arc-shaped spring sheet 10 separate from the inner edge of the filter tube 6, the curvature of the arc-shaped spring sheet 10 increases, and the gap between the inner bristles increases. After the inner bristles are separated from the inner edge of the filter tube 6, the impurities between the outer edge of the arc-shaped spring sheet 10 and the inner edge of the filter tube 6 are conveniently discharged. After the gap between the inner bristles increases, it is convenient to discharge the impurities mixed between the inner bristles. High-pressure pure water is introduced into the outlet chamber 24 to backwash the plate heat exchanger 102. The pure water enters the inlet chamber 5 and enters the filter tube 6 through the filter holes on the filter tube 6. The pure water entering the filter tube 6 can carry the impurities in the filter tube 6 and discharge them.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for separating natural gas and hydrogen based on a hydrate method, comprising a plate heat exchanger (102), characterized in that: The plate heat exchanger (102) is connected to the hydrogen-mixed natural gas pipeline (101), the plate heat exchanger (102) is connected to the hydrate reactor through a pipeline, the plate heat exchanger (102) is also connected to the propane refrigeration device (111), the water pipeline (110) is connected to the hydrate reactor, the hydrate reactor is respectively connected to the hydrogen pipeline (106) and the water-containing natural gas pipeline (107), the water-containing natural gas pipeline (107) is connected to the natural gas dehydration device (105), and the natural gas dehydration device (105) is also connected to the dehydrated natural gas pipeline The plate heat exchanger (102) is connected to a gas pipeline (108), a first natural gas pipeline (109) is connected to a hydrate reactor, and an electric heater (112) is provided on the first natural gas pipeline (109); an inlet chamber (5), an outlet chamber (24), a mixed gas inlet chamber (22) and a mixed gas outlet chamber (23) are provided in the plate heat exchanger (102), and a filtering device is provided in the inlet chamber (5); the filtering device comprises a filtering tube (6), and the filtering tube (6) is rotatably sealed and connected to the inlet chamber (5); a driving device is provided in the plate heat exchanger (102), and a driving device is provided to drive the driving device. The device drives the filter tube (6) to rotate in the inlet chamber (5); an external cleaning device for cleaning the outer edge of the filter tube (6) is arranged in the inlet chamber (5); an internal cleaning device for cleaning the inner edge of the filter tube (6) is arranged in the inlet chamber (5); the external cleaning device comprises an arc-shaped elastic sheet (16); the arc-shaped elastic sheet (16) is in a continuous wave shape and forms a plurality of wave crests (26) and wave troughs (25); an external brush (17) is fixed on the arc top of the wave trough (25); the external brush (17) contacts the outer edge of the filter tube (6), and the filter Both ends of the tube (6) are sleeved with guide rings (18) concentric therewith, the guide rings (18) being fixed in the inlet cavity (5) via a first fixing plate (19), the guide rings (18) penetrating the wave crests (26) and wave troughs (25) of the elastic sheet (16), the guide rings (18) being slidably matched with the wave crests (26) and wave troughs (25) of the elastic sheet (16), the guide rings (18) on both sides of the elastic sheet (16) being installed with first air drive devices, the first air drive devices allowing the elastic sheet (16) to be driven to move on the guide rings (18).

2. The device for separating natural gas and hydrogen based on the hydrate method according to claim 1, characterized in that: The dehydrated natural gas pipeline (108) is connected to the first natural gas pipeline (109) upstream of the electric heater (112).

3. The device for separating natural gas and hydrogen based on the hydrate method according to claim 1, characterized in that: The internal cleaning device comprises an arc-shaped spring piece (10), the outer edge of which is fixed with inner bristles, the inner bristles contacting the inner edge of the filter tube (6), connecting rods (11) fixed at both ends of the arc-shaped spring piece (10), a semicircular ring-shaped sliding groove (13) is provided on the plate heat exchanger (102), one end of the connecting rod (11) is slidably arranged in the sliding groove (13), and a second air drive device is provided on the plate heat exchanger (102), the second air drive device allows the two connecting rods (11) to be driven to slide in the arc-shaped groove at the same time, and during the sliding process of the two connecting rods (11) in the sliding groove (13), the two connecting rods (11) approach each other, the curvature of the arc-shaped spring piece (10) increases, and the gap between the inner bristles increases.

4. The device for separating natural gas and hydrogen based on the hydrate method according to claim 3, characterized in that: The plate heat exchanger (102) further comprises a first pressing plate (1) and a second pressing plate (3), wherein the first pressing plate (1) and the second pressing plate (3) are connected via a pressing bolt (4), and both ends of the filter tube (6) are rotatably sealedly connected to the first pressing plate (1) and the second pressing plate (3) of the plate heat exchanger (102), respectively, and a plurality of cooling medium plates (2) and a plurality of material plates (27) are arranged between the first pressing plate (1) and the second pressing plate (3), and the material plates (27) and the cooling medium plates (2) are arranged alternately and mutually The plurality of cooling medium plates (2) and the plurality of material plates (27) are clamped by the first clamping plate (1) and the second clamping plate (3); the inlet cavity (5), the outlet cavity (24), the mixed gas inlet cavity (22) and the mixed gas outlet cavity (23) all penetrate the first clamping plate (1), the plurality of cooling medium plates (2) and the plurality of material plates (27); the inlet cavity (5) and the outlet cavity (24) are connected to the interior of the cooling medium plates (2) to form a cooling channel; the mixed gas inlet cavity (22) and the mixed gas outlet cavity (23) are connected to the interior of the material plates (27) to form a material channel.

5. The device for separating natural gas and hydrogen based on the hydrate method according to claim 1, characterized in that: The driving device comprises a gear ring (7) fixed on the filter tube (6), a motor (9) is fixed on the second pressing plate (3) of the plate heat exchanger (102), a gear (8) is fixed on the output shaft of the motor (9), and the gear (8) is meshed with the gear ring (7).

6. The device for separating natural gas and hydrogen based on the hydrate method according to claim 1, characterized in that: The first air drive device comprises a second fixing plate (21) fixed on the guide ring (18), a telescopic airbag (20) is sleeved on the guide ring (18) between the second fixing plate (21) and the elastic sheet (16), and the telescopic airbag (20) is connected to the air pump.

7. The device for separating natural gas and hydrogen based on the hydrate method according to claim 4, characterized in that: The second gas drive device comprises a piston rod (12) fixed to one end of a connecting rod (11), the piston rod (12) being arc-shaped, and an arc-shaped piston chamber (14) is provided on the second clamping plate (3) of the plate heat exchanger (102), the piston chamber (14) being connected and concentric with the sliding groove (13), the piston rod (12) and the piston chamber (14) being concentrically arranged, the piston chamber (14) and the sliding groove (13) forming a circular guide channel, the piston rod (12) being slidingly sealedly connected in the piston chamber (14), the piston chamber (14) between the two piston rods (12) being connected to a gas channel (15) on the second clamping plate (3), and the gas channel (15) being connected to a gas source.

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