CN215113528U - Device for extracting helium from natural gas to prepare liquid helium - Google Patents

Device for extracting helium from natural gas to prepare liquid helium Download PDF

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Publication number
CN215113528U
CN215113528U CN202120846352.4U CN202120846352U CN215113528U CN 215113528 U CN215113528 U CN 215113528U CN 202120846352 U CN202120846352 U CN 202120846352U CN 215113528 U CN215113528 U CN 215113528U
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China
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helium
membrane separation
separation unit
pipe
natural gas
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孙立佳
高元景
李腾
张志杰
张宏利
李哲
杨耀森
郑宏亮
李文君
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Beijing Hengtai Jieneng Technology Co ltd
Shenyang Branch Of China National Petroleum Corp Northeast Refining & Chemical Engineering Co ltd
TIANBANG NATIONAL ENGINEERING RESEARCH CENTER OF MEMBRANE TECHNOLOGY CO LTD
Tianyi Technology (Dalian) Co.,Ltd.
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Shenyang Branch Of China National Petroleum Corp Northeast Refining & Chemical Engineering Co ltd
TIANBANG NATIONAL ENGINEERING RESEARCH CENTER OF MEMBRANE TECHNOLOGY CO LTD
Beijing Hengtai Jieneng Technology Co ltd
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Abstract

The utility model belongs to the technical field of gas separation, especially, a device for extracting helium and prepare liquid helium from natural gas, including one-level membrane separation unit, MDEA decarbonization unit, catalytic oxidation dehydrogenation unit, drying device, second grade membrane separation unit, tertiary membrane separation unit, PSA device, analytic gas compressor, non-permeate gas compressor and helium liquefying plant, the utility model provides a pair of draw the device that liquid helium was prepared to helium from natural gas, adopt membrane separation and PSA separation technique, draw out the helium in the natural gas and make high-purity helium to send to helium liquefying plant liquefaction and obtain liquid helium product, the device obtains high-purity helium in normal atmospheric temperature district, has characteristics such as the energy consumption is low, the helium rate of recovery is high, the investment is economized, flexible operation, operating mode adaptability is strong.

Description

Device for extracting helium from natural gas to prepare liquid helium
Technical Field
The utility model relates to a gas separation technical field especially relates to a device for extracting helium and prepare liquid helium from natural gas.
Background
Helium, known under the english name Helium and the chemical symbol He, is a colorless, odorless noble gas, also known as the lowest boiling point gas, which has the properties of being difficult to liquefy, good stability, strong diffusivity, low solubility, etc. Helium is an important scarce strategic resource which is irreplaceable and related to the national security and the development of high and new technology industries due to the special physical and chemical properties of helium.
Helium is typically extracted from natural gas in relatively high content proportions. Although there are numerous natural gas fields, there is no tendency for the fields from which helium can be extracted to increase substantially. The reason is that there are limited gas fields from which helium can be extracted at a cost effective rate. Recently, the vigorously exploited shale fields also cannot extract helium.
The helium-containing natural gas data of the main oil-gas-containing basin in China shows that the helium is widely distributed, has a plurality of levels, but has low research degree. At present, it is known that helium-containing natural gas is found in 8 basins such as Weihe, Sichuan, Tarim, Chadamu, Songliao, Bohai Bay, Subei, and Hiragel. In general, the large overlapping basin in the west and the flat break band in the east tanh have helium resource prospect. The Wenquan gas field in the Sichuan basin is the first gas field in China for realizing the commercial utilization of helium and is also the only helium field for industrial exploitation in China at present.
In recent years, the demand for helium resources in the fields of optical fibers and electronics of China and medical nuclear magnetic imaging rises year by year, the demand of about 2200 ten thousand cubic meters (namely 3922 tons) in 2018 is expected, and the demand of helium in China is expected to increase to 2240 ten thousand cubic meters (namely 4400 tons) in 2020. The development of 5G industry, semiconductor industry, aerospace industry and the like ensures that the demand of China for helium resources is high, but the helium market situation is more tense due to the events such as middle east conflict, middle American trade war and the like, the helium resource is not in demand and high in price at present, and the helium market situation is tense or continues to be continuous in short time.
The natural gas helium extraction equipment is divided into cryogenic equipment and non-cryogenic equipment, and the cryogenic equipment is still the main industrial choice. Non-cryogenic helium extraction equipment may be superior to cryogenic processes in energy and material consumption, but at the present time non-cryogenic equipment has not matured enough to be produced on a large scale in the natural gas helium extraction industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an extract helium and prepare device of liquid helium from natural gas, the device adopt membrane separation to add PSA separation technique, draw out the helium in the natural gas and make high-purity helium to send to helium liquefaction device liquefaction and obtain the liquid helium product.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for extracting helium from natural gas to prepare liquid helium comprises a primary membrane separation unit, an MDEA decarburization unit, a catalytic oxidation dehydrogenation unit, a drying device, a secondary membrane separation unit, a tertiary membrane separation unit, a PSA device, a desorption gas compressor, a non-permeation gas compressor and a helium liquefying device;
the top of the primary membrane separation unit is connected to a natural gas pipeline network through a pipeline, the middle of the primary membrane separation unit is connected to the MDEA decarburization unit through a pipeline, the MDEA decarburization unit is connected to the catalytic oxidation dehydrogenation unit through a pipeline, the catalytic oxidation dehydrogenation unit is connected to the drying device through a pipeline, and the drying device is connected to the inlet of the secondary membrane separation unit through a pipeline;
an outlet at one side of the secondary membrane separation unit is connected to an inlet of the non-permeable gas compressor through a pipeline, an outlet of the non-permeable gas compressor is connected to a natural gas pipe network through a pipeline, and an outlet at the other side of the secondary membrane separation unit is connected to the third-stage membrane separation unit through a pipeline;
the top of the three-stage membrane separation unit is connected with the tail section of the desorption gas compressor through a pipeline, and one side of the three-stage membrane separation unit is connected with the PSA device through a pipeline;
the top of the PSA device is connected with the helium liquefying device through a pipeline, one side of the PSA device is connected with an inlet of the desorption gas compressor through a pipeline, and an outlet of the desorption gas compressor is connected with an inlet of the secondary membrane unit.
Further, high-pressure helium-containing natural gas extracted from a wellhead is introduced into the primary membrane separation unit through a wellhead natural gas pipeline, then the natural gas of the primary membrane separation unit is sent to the natural gas pipe network, and the permeating gas of the primary membrane separation unit is sent to the MDEA decarburization unit.
Further, the MDEA decarburization unit comprises an absorption tower and a regeneration tower which are connected in sequence.
Further, the catalytic oxidation dehydrogenation unit comprises a catalytic oxidation dehydrogenating device and a water cooler which are sequentially connected, the outlet of the MDEA decarburization unit is connected with the catalytic oxidation dehydrogenating device through a pipeline, and the outlet of the water cooler is connected with the secondary membrane separation unit.
Further, the gas sent out by the water cooler enters the second-stage membrane separation unit, the non-permeate gas of the second-stage membrane separation unit is sent to the natural gas pipe network after being boosted by the non-permeate gas compressor, the permeate gas of the second-stage membrane separation unit is sent to the third-stage membrane separation unit, the non-permeate gas of the third-stage membrane separation unit is sent to the tail section of the desorption gas compressor, the gas in the desorption gas compressor is sent to the inlet of the second-stage membrane separation unit after being boosted, and the helium end outlet of the third-stage membrane separation unit is connected to the PSA device through a pipeline.
Further, an adsorbent is arranged in the PSA device.
Further, the drying device comprises a drying box, a plurality of condensing pipes are fixedly arranged on the inner wall of the drying box at equal intervals, a coiled pipe is fixedly arranged in the drying box, the coiled pipe is matched with the plurality of condensing pipes, two ends of the coiled pipe respectively extend to two sides of the drying box, a collecting box is fixedly arranged on the inner wall of the bottom of the drying box, a collecting pipe is fixedly arranged on the inner wall of the top of the collecting box, the top end of the collecting pipe extends into the coiled pipe and is fixedly connected with the inner wall of the bottom of the coiled pipe, a mounting box is fixedly arranged at the bottom of one side of the drying box, a conveying pipe is fixedly arranged on the inner wall of one side of the mounting box, one end of the conveying pipe extends into the collecting box and is fixedly connected with the inner wall of one side of the collecting box, a drain pipe is fixedly arranged on the inner wall of the other side of the mounting box, and one end of the drain pipe extends to the outer side of the mounting box, sealed sliding connection has the removal pipe on the drain pipe inner wall, the one end of removing the pipe extend to the install bin and with conveyer pipe sealed sliding connection, on the inner wall of conveyer pipe and on removing the inner wall of pipe respectively fixed mounting have first check valve and second check valve, and first check valve and second check valve cooperate, it is connected with the dwang to rotate on the top inner wall of install bin, and the dwang is connected with the transmission of removal pipe.
Preferably, the other end of the conveying pipe is fixedly communicated with a connecting cover, a sealing plate located in the connecting cover is fixedly sleeved on the movable pipe, the sealing plate is in sealing sliding connection with the inner wall of the connecting cover, and water can be prevented from leaking by virtue of the sealing sliding connection between the sealing plate and the connecting cover.
Preferably, sliding connection has the removal rack on the top inner wall of install bin, and the bottom fixed mounting who removes the rack has the movable plate, the dwang is connected with the transmission of removal rack, the bottom sliding connection of movable plate has the connecting rod, the bottom and the removal pipe transmission of connecting rod are connected, and through the longitudinal movement who removes the rack, can make the removal pipe carry out lateral motion.
Preferably, the bottom of connecting rod is rotated and is connected with the swivel becket, and the bottom of swivel becket and the rotation of the bottom one side inner wall of install bin are connected, the bottom of removing the pipe is removed and is installed L type pole, the one end of L type pole extends to in the swivel becket and contacts with the inner wall of swivel becket, through the cooperation motion of L type pole and swivel becket, can turn into the straight line lateral motion who removes the pipe with the rotary motion of swivel becket.
Preferably, the bottom of the movable plate is fixedly provided with a sliding rod, the sliding rod penetrates through the connecting rod and is in sliding connection with the connecting rod, the sliding rod is sleeved with a compression spring located on one side of the connecting rod, two ends of the compression spring are fixedly connected with one side of the connecting rod and one end of the sliding rod respectively, when the compression spring is used for performing transverse movement on the connecting rod, an auxiliary force is provided, and the rotating ring can be further conveniently rotated downwards.
Preferably, there are first arc rack and second arc rack in the both sides of dwang fixed mounting respectively, and tooth on the first arc rack and the tooth on the second arc rack are the symmetry and set up, it is connected with the pivot to rotate on one side inner wall of install bin, fixed cover is equipped with rotating gear in the pivot, rotating gear meshes with the removal rack mutually, the one end fixed mounting of pivot has drive gear, first arc rack and second arc rack respectively with drive gear movable engagement, through first arc rack and second arc rack and drive gear be interrupted the meshing, can drive rotating gear and carry out forward reverse rotation.
The utility model has the advantages that: the device is used for obtaining the high-purity helium gas in a normal temperature area, and has the characteristics of low energy consumption, high helium gas recovery rate, investment saving, flexible operation, strong adaptability to variable working conditions and the like.
Drawings
Fig. 1 is a schematic view of an apparatus for extracting helium from natural gas to produce liquid helium according to the present invention;
fig. 2 is a front view of the drying device of the device for extracting helium gas from natural gas to produce liquid helium according to the present invention;
fig. 3 is a front view of the internal structure of the installation box of the drying device of the device for extracting helium gas from natural gas to produce liquid helium according to the present invention;
fig. 4 is a top view of a connecting structure of the rotating rod, the first arc-shaped rack and the second arc-shaped rack of the drying device of the device for extracting helium gas from natural gas to prepare liquid helium according to the present invention;
fig. 5 is a rear view of the connection structure of the connection rod, the rotation ring and the moving pipe of the drying device of the device for extracting helium gas from natural gas to prepare liquid helium according to the present invention.
In the figure: 100 first-stage membrane separation units, 200MDEA decarburization units, 300 catalytic oxidative dehydrogenation units, 400 drying devices, 500 second-stage membrane separation units, 600 third-stage membrane separation units, 700PSA devices, 800 desorption gas compressors, 900 non-permeable gas compressors, 110 helium liquefying devices, 120 natural gas pipe networks, 130 wellhead natural gas pipelines, 1 drying box, 2 condensing pipes, 3 coiled pipes, 4 collecting boxes, 5 mounting boxes, 6 moving plates, 7 connecting rods, 8 compression springs, 9 water discharging pipes, 10 rotating rings, 11 conveying pipes, 12 first check valves, 13 moving pipes, 14 second check valves, 15 sealing plates, 16 connecting covers, 17 rotating shafts, 18 rotating gears, 19 transmission gears, 20 rotating rods, 21 first arc-shaped racks, 22 second arc-shaped racks, 23 moving racks and 24L-shaped rods.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
The numbers and data mentioned in this embodiment are only data measured by actual experiments, and are used for expressing the actual operation parameter status of the utility model, and the parameters can be adjusted in the actual use, so the numbers and data mentioned below do not limit the utility model in any way.
As shown in fig. 1, an apparatus for extracting helium from natural gas to prepare liquid helium comprises a primary membrane separation unit, an MDEA decarbonization unit, a catalytic oxidative dehydrogenation unit, a drying device, a secondary membrane separation unit, a tertiary membrane separation unit, a PSA device, a desorption gas compressor, a permeate gas compressor and a helium liquefaction device, wherein a non-permeate gas of the primary membrane separation unit is sent to a natural gas pipeline network through a pipeline, and a permeate gas is connected to the MDEA decarbonization unit through a pipeline; the non-permeate gas of the second-stage membrane separation unit is sent to the inlet of a non-permeate gas compressor through pipeline connection, the outlet of the non-permeate gas compressor is connected to a natural gas pipeline network through a pipeline, and the permeate gas is connected to the third-stage membrane separation unit through a pipeline; the non-permeate gas of the three-stage membrane separation unit is connected with the tail section of the desorption gas compressor through a pipeline, and the permeate gas is connected to the PSA device through a pipeline; the product gas pipeline of the PSA device is connected with the helium liquefying device, desorption gas is connected with an inlet of a desorption gas compressor, and an outlet of the desorption gas compressor is connected with a secondary membrane separation inlet.
The method comprises the steps of extracting helium from a wellhead at a high pressure and normal temperature, wherein the pressure of natural gas containing helium is 5.0-6.5 MPa, the concentration of helium is 0.6-1.5%, pre-concentrating the natural gas through a primary membrane separation unit, the pressure of the natural gas after helium extraction is 4.9-6.4 MPa, sending the natural gas to a natural gas pipe network, introducing 3.0-3.5 MPa permeation gas into an absorption tower of an MDEA decarburization unit to remove acid gas, arranging methyldiethanolamine inside the absorption tower, and purifying CO in the gas2Less than 30ppm, regenerating the rich amine solution absorbing acid gas in a regenerating tower and regeneratingAnd returning the after-treated lean amine liquid as a washing liquid to the absorption tower. The deacidified crude helium enters a catalytic oxidation dehydrogenation unit at the pressure of 2.9-3.4 MPa, a small amount of pure oxygen is supplemented, hydrogen contained in the catalytic oxidation dehydrogenation unit is oxidized into water under the action of a catalyst, the hydrogen removal precision reaches 1ppm, and the dehydrogenated high-temperature gas is cooled to normal temperature by a water cooler and then is sent to a drying device; in the drying device, the moisture contained in the gas is removed to below-65 ℃ of dew point. In another embodiment, CO can be arranged at the tail part of the drying device2Adsorber for further adsorbing CO2Introduction of CO into2Further removed to 2 ppm.
The purified crude helium pressure is 2.8-3.3 MPa, the purified crude helium enters a secondary membrane separation unit, the non-permeation gas is sent to a natural gas pipe network after being boosted to 5.0-6.5 MPa through a compressor, the permeation gas pressure is 2.5-2.8 MPa, the non-permeation gas is sent to a tertiary membrane separation unit for further concentration, the non-permeation gas of the tertiary membrane separation unit is sent to the tail end of a desorption gas compressor, the pressure is boosted to 3.0-3.4 MPa, the non-permeation gas is sent to an inlet of the secondary membrane separation unit, and the helium concentration in the permeation gas reaches 45% -50% and is sent to a PSA device. And (3) introducing the 1.5-1.7 MPa crude helium into a PSA (pressure swing adsorption) device, adsorbing the contained nitrogen, oxygen and other impurities by using an adsorbent to obtain high-purity helium with the purity of more than 99.999%, and liquefying the high-purity helium by using a helium liquefying device to obtain a liquid helium product. The adsorbent for adsorbing the impurities is regenerated after being decompressed, the adsorbed impurities are analyzed, and the analyzed gas is compressed and boosted by an analysis gas compressor and then is sent to an inlet of a secondary membrane separation unit.
PSA's meaning is pressure swing adsorption, PSA device 700 is the pressure swing adsorption equipment, the MDEA is methyl diethanolamine, as an preferred embodiment, the catalyst in catalytic oxidation dehydrogenation unit 300 is platinum base dehydrogenation catalyst, one-level membrane separation unit 100, second grade membrane separation unit 500 and tertiary membrane separation unit 600 are membrane separation device, helium liquefying plant 110 are the helium liquefier, the gas dryer that drying device 400 can adopt also can adopt embodiment 2 drying device.
Example 2
As shown in fig. 2-5, the drying device 400 includes a drying box 1, a plurality of condensing pipes 2 are fixedly installed on the inner wall of the drying box 1 at equal intervals, a serpentine pipe 3 is fixedly installed in the drying box 1, the serpentine pipe 3 is matched with the plurality of condensing pipes 2, two ends of the serpentine pipe 3 respectively extend to two sides of the drying box 1, a collecting box 4 is fixedly installed on the inner wall of the bottom of the drying box 1, a collecting pipe is fixedly installed on the inner wall of the top of the collecting box 4, the top end of the collecting pipe extends into the serpentine pipe 3 and is fixedly connected with the inner wall of the bottom of the serpentine pipe 3, a mounting box 5 is fixedly installed at the bottom of one side of the drying box 1, a conveying pipe 11 is fixedly installed on the inner wall of one side of the mounting box 5, one end of the conveying pipe 11 extends into the collecting box 4 and is fixedly connected with the inner wall of one side of the collecting box 4, a drain pipe 9 is fixedly installed on the inner wall of the other side of the mounting box 5, and the one end of drain pipe 9 extends to the outside of install bin 5, sealed sliding connection has removal pipe 13 on the drain pipe 9 inner wall, the one end of removing pipe 13 extends to in the install bin 5 and with conveyer pipe 11 sealed sliding connection, on the inner wall of conveyer pipe 11 and on removing the inner wall of pipe 13 respectively fixed mounting have first check valve 12 and second check valve 14, and first check valve 12 cooperatees with second check valve 14, it is connected with dwang 20 to rotate on the top inner wall of install bin 5, and dwang 20 is connected with removal pipe 13 transmission.
Wherein, the utility model discloses a rotating dwang 20 can drive and remove pipe 13 and carry out horizontal reciprocating motion to this alright can be fast with the water discharge that the gas after the dehydrogenation produced when the condensation is dry, guarantee to be in dry state in drying cabinet 1, make to be in clean dry state in the coiled pipe 3, so have good practicality.
The utility model discloses in, fixed intercommunication has connecting cover 16 on the other end of conveyer pipe 11, and removes on the pipe 13 fixed cover and be equipped with the closing plate 15 that is located connecting cover 16, and closing plate 15 and connecting cover 16's inner wall sealing sliding connection utilize the sealing sliding connection between closing plate 15 and the connecting cover 16, can prevent that water from taking place to leak.
The utility model discloses in, sliding connection has movable rack 23 on the top inner wall of install bin 5, and the bottom fixed mounting who removes rack 23 has movable plate 6, and dwang 20 is connected with the transmission of movable rack 23, and the bottom sliding connection of movable plate 6 has connecting rod 7, and the bottom of connecting rod 7 is connected with the transmission of removal pipe 13, through the longitudinal motion of removing rack 23, can be so that remove pipe 13 and carry out lateral motion.
The utility model discloses in, the bottom of connecting rod 7 is rotated and is connected with swivel 10, and the bottom of swivel 10 is connected with the bottom one side inner wall rotation of install bin 5, removes the bottom removal of pipe 13 and installs L type pole 24, and the one end of L type pole 24 extends to in the swivel 10 and contacts with the inner wall of swivel 10, through the cooperation motion of L type pole 24 and swivel 10, can turn into the straight line transverse motion that removes pipe 13 with the rotary motion of swivel 10.
The utility model discloses in, the bottom fixed mounting of movable plate 6 has the slide bar, and the slide bar run through connecting rod 7 and with connecting rod 7 sliding connection, the cover is equipped with the compression spring 8 that is located connecting rod 7 one side on the slide bar, compression spring 8's both ends respectively with one side of connecting rod 7 and the one end fixed connection of slide bar, when utilizing compression spring 8 can carry out lateral shifting for connecting rod 7, provide the auxiliary force, further can make things convenient for swivel 10 to rotate downwards.
The utility model discloses in, the both sides of dwang 20 fixed mounting respectively have first arc rack 21 and second arc rack 22, and tooth on the first arc rack 21 and the tooth on the second arc rack 22 are the symmetry and set up, it is connected with pivot 17 to rotate on one side inner wall of install bin 5, fixed cover is equipped with rotating gear 18 in the pivot 17, rotating gear 18 meshes with removal rack 23 mutually, the one end fixed mounting of pivot 17 has drive gear 19, first arc rack 21 and second arc rack 22 respectively with 19 swing joint of drive gear, through the meshing of being interrupted of first arc rack 21 and second arc rack 22 and drive gear 19, can drive rotating gear 18 and carry out forward and reverse rotation.
In the utility model, the technical proposal is that a plurality of condensing pipes 2 are electrified, the drying box 1 can be cooled at the moment, the dehydrogenated gas is introduced through the coiled pipe 3, the dehydrogenated gas can be cooled and dried according to the heat exchange principle, the hydrone in the dehydrogenated gas can be liquefied quickly and flows downwards and can enter the collecting box 4 from the collecting pipe for centralized storage, the dehydrogenated gas can be discharged through the coiled pipe 3 after being cooled and dried, the dryness in the dehydrogenated gas can be ensured when the dehydrogenated gas is treated in the later period, when the water in the collecting box 4 needs to be removed, the first arc-shaped rack 21 and the second arc-shaped rack 22 are driven to do circular motion by rotating the rotating rod 20, so that the first arc-shaped rack 21 and the second arc-shaped rack 22 are repeatedly and discontinuously meshed with the transmission gear 19, when the first arc-shaped rack 21 is meshed with the transmission gear 19 for transmission, the transmission gear 19 rotates anticlockwise, namely the transmission gear 18 drives the moving rack 23 to move downwards, when the moving rack 23 moves downwards, the moving plate 6 can be driven to move downwards, the compression spring 8 in a stressed state can push the connecting rod 7 to move transversely, meanwhile, the longitudinal height of the connecting rod 7 is reduced, so that the rotating ring 10 can rotate downwards, the moving pipe 13 can be pushed to one side of the conveying pipe 11 through the L-shaped rod 24, when the second arc-shaped rack 22 is meshed with the transmission gear 19, the transmission gear 23 can rotate clockwise, the moving ring 6 can be driven to move upwards, when the moving plate 6 moves upwards, the moving plate can drive the rotating ring 10 to rotate upwards, therefore, the moving pipe 13 can move towards the side far away from the delivery pipe 11, so that when the first arc-shaped rack 21 and the second arc-shaped rack 22 are repeatedly and discontinuously meshed with the transmission gear 19, the moving pipe 13 can transversely reciprocate, when the moving pipe 13 is far away from the delivery pipe 11, the space between the first check valve 12 and the second check valve 14 can be in a negative pressure state, so that the valve core on the first check valve 12 can be in an open state under the action of negative pressure, water in the collecting tank 4 can be sucked into the space between the first check valve 12 and the second check valve 14, when the moving pipe 13 is close to the delivery pipe 11, the sealing plate 15 can generate certain pressure on the water, and simultaneously, the valve core on the second check valve 14 can be under the action of water pressure, so that the second check valve 14 is in an open state, and at the same time, the water can flow into the drain pipe 9 and be drained from the second check valve 14, therefore, when the moving pipe 13 does continuous reciprocating motion, the water in the collecting box 4 can be continuously discharged, so that the water generated by the dehydrogenated gas during condensation drying can be quickly discharged, the drying box 1 is ensured to be in a drying state, the coil pipe 3 is in a clean and dry state, and the device has good practicability.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (10)

1. The device for extracting helium from natural gas to prepare liquid helium is characterized by comprising a primary membrane separation unit (100), an MDEA decarburization unit (200), a catalytic oxidation dehydrogenation unit (300), a drying device (400), a secondary membrane separation unit (500), a tertiary membrane separation unit (600), a PSA device (700), a desorption gas compressor (800), a non-permeable gas compressor (900) and a helium liquefying device (110);
the top of the primary membrane separation unit (100) is connected to a natural gas pipeline network (120) through a pipeline, the middle of the primary membrane separation unit is connected to the MDEA decarburization unit (200) through a pipeline, the MDEA decarburization unit (200) is connected to the catalytic oxidative dehydrogenation unit (300) through a pipeline, the catalytic oxidative dehydrogenation unit (300) is connected to the drying device (400) through a pipeline, and the drying device (400) is connected to the inlet of the secondary membrane separation unit (500) through a pipeline;
an outlet at one side of the secondary membrane separation unit (500) is connected to an inlet of the non-permeable gas compressor (900) through a pipeline, an outlet of the non-permeable gas compressor (900) is connected to a natural gas pipeline network (120) through a pipeline, and an outlet at the other side of the secondary membrane separation unit (500) is connected to the tertiary membrane separation unit (600) through a pipeline;
the top of the three-stage membrane separation unit (600) is connected with the tail section of the desorption gas compressor (800) through a pipeline, and one side of the three-stage membrane separation unit (600) is connected with the PSA device (700) through a pipeline;
the top of the PSA device (700) is connected with the helium liquefying device (110) through a pipeline, one side of the PSA device (700) is connected with the inlet of the desorption gas compressor (800) through a pipeline, and the outlet of the desorption gas compressor (800) is connected with the inlet of the secondary membrane unit (500).
2. The apparatus for extracting helium from natural gas to produce liquid helium according to claim 1, wherein the high pressure helium-containing natural gas produced from a wellhead is introduced into the primary membrane separation unit (100) through a wellhead natural gas pipeline (130), then the natural gas of the primary membrane separation unit (100) is sent to the natural gas pipeline network (120), and the permeate gas of the primary membrane separation unit (100) is sent to the MDEA decarburization unit (200).
3. The apparatus for extracting helium from natural gas to produce liquid helium according to claim 1, wherein the MDEA decarbonization unit (200) comprises an absorption column and a regeneration column connected in series.
4. The apparatus for extracting helium from natural gas to produce liquid helium according to claim 1, wherein the catalytic oxidative dehydrogenation unit (300) comprises a catalytic oxidative dehydrogenation device and a water cooler connected in sequence, wherein an outlet of the MDEA decarburization unit (200) is connected with the catalytic oxidative dehydrogenation device through a pipeline, and an outlet of the water cooler is connected with the secondary membrane separation unit (500).
5. The device for extracting helium from natural gas to prepare liquid helium according to claim 4, wherein the gas sent by the water cooler enters the secondary membrane separation unit (500), the non-permeable gas of the secondary membrane separation unit (500) is boosted by the non-permeable gas compressor (900) and then sent to the natural gas pipeline network (120), the permeable gas of the secondary membrane separation unit (500) is sent to the tertiary membrane separation unit (600), the non-permeable gas of the tertiary membrane separation unit (600) is sent to the tail section of the desorption gas compressor (800), the gas in the desorption gas compressor (800) is boosted and then sent to the inlet of the secondary membrane separation unit (500), and the helium outlet of the tertiary membrane separation unit (600) is connected to the PSA device (700) through a pipeline.
6. The apparatus for extracting helium from natural gas to produce liquid helium as claimed in claim 2, wherein an adsorbent is disposed within said PSA apparatus (700).
7. The device for extracting helium from natural gas to prepare liquid helium according to claim 1, wherein the drying device (400) comprises a drying box (1), a plurality of condensing pipes (2) are fixedly installed on the inner wall of the drying box (1) at equal intervals, a coiled pipe (3) is fixedly installed in the drying box (1), the coiled pipe (3) is matched with the plurality of condensing pipes (2), two ends of the coiled pipe (3) respectively extend to two sides of the drying box (1), the device is characterized in that a collecting box (4) is fixedly installed on the inner wall of the bottom of the drying box (1), a collecting pipe is fixedly installed on the inner wall of the top of the collecting box (4), the top end of the collecting pipe extends into the coiled pipe (3) and is fixedly connected with the inner wall of the bottom of the coiled pipe (3), a mounting box (5) is fixedly installed at the bottom of one side of the drying box (1), the automatic cleaning device is characterized in that a conveying pipe (11) is fixedly mounted on the inner wall of one side of the installation box (5), one end of the conveying pipe (11) extends into the collection box (4) and is fixedly connected with the inner wall of one side of the collection box (4), a drain pipe (9) is fixedly mounted on the inner wall of the other side of the installation box (5), one end of the drain pipe (9) extends to the outer side of the installation box (5), a moving pipe (13) is connected onto the inner wall of the drain pipe (9) in a sealing and sliding mode, one end of the moving pipe (13) extends into the installation box (5) and is connected with the conveying pipe (11) in a sealing and sliding mode, a first check valve (12) and a second check valve (14) are fixedly mounted on the inner wall of the conveying pipe (11) and the inner wall of the moving pipe (13) respectively, the first check valve (12) is matched with the second check valve (14), and a top inner wall of a rotating rod of the installation box (5) is rotatably connected with a pipe (20), and the rotating rod (20) is in transmission connection with the moving pipe (13).
8. The device for extracting helium from natural gas to produce liquid helium as claimed in claim 7, wherein the other end of the delivery pipe (11) is fixedly communicated with a connecting cover (16), and the moving pipe (13) is fixedly sleeved with a sealing plate (15) positioned in the connecting cover (16), and the sealing plate (15) is in sealing sliding connection with the inner wall of the connecting cover (16).
9. The device for extracting helium from natural gas to prepare liquid helium according to claim 7, wherein a moving rack (23) is slidably connected to the inner wall of the top of the installation box (5), a moving plate (6) is fixedly installed at the bottom end of the moving rack (23), the rotating rod (20) is in transmission connection with the moving rack (23), a connecting rod (7) is slidably connected to the bottom of the moving plate (6), and the bottom end of the connecting rod (7) is in transmission connection with the moving pipe (13).
10. The device for extracting helium from natural gas to prepare liquid helium according to claim 9, wherein the bottom end of the connecting rod (7) is rotatably connected with a rotating ring (10), the bottom end of the rotating ring (10) is rotatably connected with the inner wall of one side of the bottom of the installation box (5), the bottom of the moving pipe (13) is movably provided with an L-shaped rod (24), and one end of the L-shaped rod (24) extends into the rotating ring (10) and is in contact with the inner wall of the rotating ring (10).
CN202120846352.4U 2021-04-23 2021-04-23 Device for extracting helium from natural gas to prepare liquid helium Active CN215113528U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114669164A (en) * 2022-03-24 2022-06-28 浙江大学 System and method for preparing high-purity helium from natural gas BOG

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114669164A (en) * 2022-03-24 2022-06-28 浙江大学 System and method for preparing high-purity helium from natural gas BOG

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