Helium extraction device for liquefied natural gas separation flash gas

Abstract

The application provides a helium extraction device for liquefied natural gas separation flash gas, comprising a support table; a membrane separation unit, a catalytic dehydrogenation unit, a water removal unit, an adsorption unit and a low-temperature refining unit are arranged on the top of the support table; the catalytic dehydrogenation unit is connected with the membrane separation unit and the water removal unit on the two sides respectively, the water removal unit is connected with the adsorption unit through a first connecting pipe, and the adsorption unit is connected with the low-temperature refining unit through a second connecting pipe; the catalytic dehydrogenation unit is used for converting hydrogen in the flash gas into water vapor; the water removal unit comprises a cylinder body fixed to the top of the support table, a condensing cylinder is arranged in the cylinder body, the condensing cylinder is sleeved with a scraping ring, and the scraping ring is connected with a lifting part; the scraping ring is composed of a first scraping strip and a second scraping strip, and the first scraping strip and the second scraping strip are connected with an adjusting assembly. The lifting part and the openable and closable scraping ring structure can scrape the water droplets and water film attached to the inner wall of the condensing cylinder downward, so that the problem of incomplete drainage and the problem of water droplets attached to the condensing cylinder are solved.

Description

Technical Field

[0001] This invention relates to the field of flash vapor recovery and utilization technology, and in particular to a helium extraction device for separating flash vapor from liquefied natural gas. Background Technology

[0002] The blink gas (BOG) separated from the natural gas liquefaction denitrification system contains a large amount of helium resources. Recovering and utilizing this helium can effectively fill the gap in the domestic industry for efficient helium extraction from lean natural gas, providing a stable helium supply for strategic fields such as aerospace, military, high-end manufacturing, and cutting-edge medical applications. Simultaneously, it can effectively avoid the resource waste caused by directly venting associated helium from natural gas fields, significantly reduce my country's dependence on imported high-purity helium, mitigate the adverse effects of international supply chain fluctuations on the development of domestic core industries, and ensure a stable helium supply for key strategic fields such as aerospace, semiconductors, and medical applications. This has extremely high resource utilization value and strategic significance.

[0003] In the natural gas flash helium extraction process, catalytic oxidation dehydrogenation is typically used to convert hydrogen impurities in the flash vapor into water vapor, which is then removed by condensation to purify the helium feedstock. Currently, the condensation and dehydration structures of existing helium extraction equipment have significant shortcomings in practical applications. While some of the liquid water generated during condensation drips and accumulates at the bottom of the equipment and can be periodically drained, a large amount of water droplets and films adhere to the inner wall of the condenser, making it difficult to detach and drain naturally. This results in incomplete drainage, and the adhering water also affects subsequent water vapor condensation.

[0004] Therefore, a helium extraction device for separating flash vapor from liquefied natural gas is provided to address the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problem of excessive water adhering to condensing equipment and causing incomplete drainage, this invention provides a helium extraction device for separating flash vapor from liquefied natural gas.

[0006] The present invention solves the above-mentioned technical problems through the following technical solutions: This invention provides a helium extraction device for separating flash vapor from liquefied natural gas, comprising a support platform; the top of the support platform is provided with a membrane separation unit, a catalytic dehydrogenation unit, a water removal unit, an adsorption unit, and a low-temperature purification unit; the catalytic dehydrogenation unit is connected to the membrane separation unit and the water removal unit on both sides respectively, the water removal unit is connected to the adsorption unit through a first connecting pipe, and the adsorption unit is connected to the low-temperature purification unit through a second connecting pipe; the catalytic dehydrogenation unit is used to convert hydrogen in the flash vapor into water vapor; the water removal unit includes a cylinder fixed to the top of the support platform, a condenser cylinder is provided inside the cylinder, the condenser cylinder is fitted with a scraper ring, and the scraper ring is connected to a lifting part; the scraper ring is composed of a first scraper and a second scraper, the first scraper and the second scraper are connected to an adjusting component, the adjusting component is used to move the first scraper and the second scraper away from or to adhere to the condenser cylinder wall.

[0007] Preferably, the membrane separation unit comprises multiple separation sections; each separation section includes a first housing, within which two spacers are fixed, and the first housing is divided into a first side channel, a second side channel, and a central channel by the two spacers; an inlet and a outlet are fixed on both sides of the first housing, and the inlet and outlet are respectively connected to the first side channel and the second side channel; multiple cylindrical separation membranes are disposed in the central channel, and the two ends of the separation membranes are respectively connected to the first side channel and the second side channel; the inlets and outlets of two adjacent separation sections are fixedly connected; a pump body is installed on the top of the first housing, the inlet end of the pump body is connected to the central channel, and the outlet end of the pump body is fixedly connected to a delivery pipe, which is connected to the catalytic dehydrogenation unit.

[0008] Preferably, the catalytic dehydrogenation unit includes a second housing; one side of the second housing is fixedly connected to a delivery pipe, and the other side of the second housing is connected to a water removal unit. Multiple carrier plates are fixed inside the second housing, and the second housing is divided into spiral channels by the multiple carrier plates. A heater is provided inside the carrier plate, and a catalytic part is provided on the carrier plate. Multiple protrusions are evenly distributed on the catalytic part.

[0009] Preferably, the dehydration unit further includes a desiccant layer disposed inside the top of the cylinder; a connection port is provided on one side of the bottom of the cylinder, and the connection port is fixedly connected to one side of the second shell; a drain port is provided at the bottom of the cylinder, and an opening and closing mechanism is provided below the drain port; the top of the cylinder is fixedly connected to the first connecting pipe.

[0010] Preferably, the lifting unit includes a long shell fixedly installed on the side wall of the cylinder. A top seat and a base are fixedly installed inside the top and bottom of the long shell, respectively, and a stud is rotatably installed between the top seat and the base. A motor is fixedly installed outside the top of the long shell, and the output shaft of the motor is fixed to one end of the stud. A movable seat is threadedly connected to the stud, and the movable seat is slidably installed inside the long shell. The adjusting component is installed on the movable seat.

[0011] Preferably, the opening and closing mechanism includes a sealing plate disposed at the bottom of the drain outlet, the sealing plate being provided with a sealing gasket, both ends of the sealing plate being elastically connected to the top surface of the support platform via a first spring, a connecting rod being fixed to the top of the sealing plate, the connecting rod passing through a hole opened at the bottom of the cylinder, and a pressure seat being fixed to the top of the connecting rod, a corrugated hose being sleeved on the connecting rod, the bottom end of the corrugated hose being fixedly sleeved with the hole, and the top end of the corrugated hose being fixed to the bottom surface of the pressure seat; a pressing seat is provided on the top of the pressure seat, and the pressing seat is fixed to the movable seat.

[0012] Preferably, the cryogenic refining unit includes a third housing, in which a plurality of coils are uniformly arranged, the coils being used to supply cryogenic coolant, and an exhaust port is provided at the top of the third housing.

[0013] Preferably, the adjusting assembly includes a trapezoidal block and a slide rail fixedly installed on the side wall of the movable seat. Two connecting seats are slidably installed on the slide rail, and the two connecting seats are respectively fixed to the first scraper and the second scraper. A wedge block is fixed to the bottom of each of the two connecting seats, and the two wedge blocks are symmetrically arranged on both sides of the trapezoidal block. The trapezoidal block is an isosceles trapezoid, and its two sides are respectively in contact with the two wedge blocks. An end plate is elastically connected to the wedge block by a third spring, and the end plate is fixed to the side wall of the movable seat. A bottom rod is fixed to the bottom of the trapezoidal block, and a sleeve plate is fitted on the bottom rod. The sleeve plate is fixed to the side wall of the movable seat, and the sleeve plate is elastically connected to the bottom rod by a second spring. A locking part is provided at the top of the connecting seat, and an unlocking part is provided at the top of the locking part. A first stop block is fixed to the top of the base, and the first stop block is located at the bottom of the bottom rod.

[0014] Preferably, the locking part includes a strip seat fixed to the side wall of the movable seat, and positioning grooves are provided at the bottom of both ends of the strip seat. A sleeve seat is fixed to the top of each of the two connecting seats. The sleeve seat is slidably sleeved with the positioning seat, and the bottom of the positioning seat is elastically connected to the connecting seat through a fourth spring.

[0015] Preferably, the unlocking part includes a push seat, the top of the strip seat is provided with a guide groove, the guide groove is aligned with and communicates with the positioning groove, the push seat is slidably connected to the guide groove, the top of the push seat is provided with a third stop block fixed to the side wall of the movable seat, and the push seat is elastically connected to the top of the strip seat through a fifth spring, one side of the push seat is bent downward to form a side seat; the top of the push seat is provided with a second stop block, and the second stop block is fixed to the top seat.

[0016] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0017] The positive and progressive effects of this invention are as follows: The helium extraction device for separating flash vapor from liquefied natural gas proposed above is equipped with a lifting unit and an openable scraper ring structure. The lifting unit drives the scraper ring to move vertically back and forth along the inner wall of the condenser, which can scrape the water droplets and water film adhering to the inner wall of the condenser downwards, solving the problems of incomplete drainage and water droplets adhering to the condenser.

[0018] Furthermore, by adjusting the components, locking mechanism, and unlocking mechanism, the scraper ring's operating state can be adaptively switched. When the scraper ring descends to the low position, the first stop automatically drives the two scraper blades to separate from and lock the condenser cylinder. This ensures that the scraper ring completely disengages from the inner wall of the condenser cylinder during its upward reset, eliminating contact friction and significantly reducing wear between the inner ring of the scraper ring and the condenser cylinder wall, thus extending its service life. When the scraper ring returns to the high position, the second stop automatically unlocks it, allowing it to automatically re-enter and adhere to the inner wall of the condenser cylinder, ensuring the accuracy and effectiveness of the next round of scraping. Simultaneously, the opening, closing, locking, and unlocking actions of the scraper blades do not require additional power sources such as motors or cylinders; they are achieved through the lifting action and the coordination of the stops.

[0019] The lifting unit drives the pressing seat to move downward to provide pushing force, which, together with the elastic restoring force, realizes the automatic opening and closing of the opening and closing mechanism. After scraping water downward, the drain outlet can be opened automatically, the scraping ring returns to its original position, and the drain outlet closes automatically. This eliminates the need for manual operation of the drain outlet, reducing the labor intensity of drainage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure at the bottom of the support platform of the present invention; Figure 3 This is a schematic diagram of the membrane separation unit of the present invention; Figure 4 This is a schematic diagram of the catalytic dehydrogenation unit of the present invention; Figure 5 This is a schematic diagram of the internal structure of the water removal unit of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram of section A in the middle; Figure 7 This is a schematic diagram of the opening and closing mechanism of the present invention; Figure 8 This is a schematic diagram of the scraper ring and lifting part of the present invention; Figure 9 This is a schematic diagram of one side of the movable seat of the present invention; Figure 10 This is a schematic diagram of the structure of the movable seat and adjustment assembly of the present invention; Figure 11 This is a schematic diagram of the locking and unlocking parts of the present invention; Figure 12 This is a schematic diagram of the structure of the low-temperature refining unit of the present invention; Figure 13 This is a schematic diagram of the structure of the coil of the present invention.

[0021] Explanation of reference numerals in the attached figures 1. Support platform; 2. Membrane separation unit; 201. First housing; 202. Spacer; 203. First side tank; 204. Middle tank; 205. Second side tank; 206. Inlet; 207. Waste outlet; 208. Separation membrane; 209. Pump body; 210. Delivery pipe; 3. Catalytic dehydrogenation unit; 301. Second housing; 302. Carrier plate; 303. Catalytic section; 3031. Protrusion; 4. Water removal unit; 401. Cylinder; 4011, Drain outlet; 402, Condenser; 4021, Inlet pipe; 4022, Drain pipe; 403, Desiccant layer; 404, Connection port; 5, Adsorption tower; 6, Low-temperature refining unit; 601, Third shell; 602, Coil; 603, Exhaust port; 7, First connecting pipe; 8, Second connecting pipe; 9, Flow guide; 10, Opening and closing mechanism; 1001, Sealing plate; 1002, Sealing gasket; 1003, First spring; 004. Connecting rod; 1005. Pressure seat; 1006. Corrugated hose; 11. Lifting part; 1101. Long shell; 1102. Top seat; 1103. Base; 1104. Motor; 1105. Stud; 1106. Movable seat; 12. Scraper ring; 1201. First scraper; 1202. Second scraper; 13. Pressing seat; 14. First stop; 15. Second stop; 16. Adjustment component; 1601. Connecting seat; 1602, Slide rail; 1603, Wedge block; 1604, Trapezoidal block; 1605, Base rod; 1606, Second spring; 1607, Third spring; 1608, End plate; 1609, Sleeve seat; 1610, Sleeve plate; 1611, Positioning seat; 1612, Fourth spring; 1613, Strip seat; 1614, Positioning groove; 1615, Push seat; 1616, Side seat; 1617, Fifth spring; 1618, Third stop block. Detailed Implementation

[0022] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0023] like Figures 1-13 As shown, a helium extraction device for separating flash vapor from liquefied natural gas includes a support platform 1; the top of the support platform 1 is provided with a membrane separation unit 2, a catalytic dehydrogenation unit 3, a water removal unit 4, an adsorption unit, and a low-temperature purification unit 6; the catalytic dehydrogenation unit 3 is connected to the membrane separation unit 2 and the water removal unit 4 on both sides respectively, the water removal unit 4 is connected to the adsorption unit through a first connecting pipe 7, and the adsorption unit is connected to the low-temperature purification unit 6 through a second connecting pipe 8.

[0024] The catalytic dehydrogenation unit 3 is used to convert hydrogen in flash vapor into water vapor.

[0025] The dewatering unit 4 includes a cylinder 401 fixed to the top of the support platform 1. A condenser cylinder 402 is provided inside the cylinder 401. A scraper ring 12 is sleeved on the condenser cylinder 402, and the scraper ring 12 is connected to a lifting part 11.

[0026] The scraper ring 12 is composed of a first scraper 1201 and a second scraper 1202, and the first scraper 1201 and the second scraper 1202 are spliced ​​into a circular ring structure, that is, the first scraper 1201 and the second scraper 1202 are both semi-circular rings. The first scraper 1201 and the second scraper 1202 are connected to an adjustment component 16, which is used to make the first scraper 1201 and the second scraper 1202 leave the wall of the condenser cylinder 402 or adhere to the wall of the condenser cylinder 402.

[0027] This device, through the arrangement of membrane separation unit 2, catalytic dehydrogenation unit 3, water removal unit 4, adsorption unit and low temperature purification unit 6, is used to remove impurities in flash vapor to purify it into high-purity helium.

[0028] After the catalytic dehydrogenation unit 3 converts the hydrogen in the flash vapor into water vapor, it enters the dehydration unit 4 and liquefies into water upon contact with the condenser 402. The lifting unit 11 drives the scraper ring 12 from the top to the bottom of the condenser 402 to scrape off the water adhering to the surface of the condenser 402, facilitating the drainage of the adhering water. After the scraper ring 12 moves to the bottom of the condenser 402, before it moves to the top of the condenser 402, the adjusting component 16 makes the first scraper strip 1201 and the second scraper strip 1202 leave the wall of the condenser 402. This prevents the scraper ring 12 from rubbing against the wall of the condenser 402 when it moves upward, thereby reducing the wear of the inner ring of the scraper ring 12 and the wall of the condenser 402. After the scraper ring 12 returns to the top of the condenser 402, the adjusting component 16 makes the first scraper strip 1201 and the second scraper strip 1202 adhere to the wall of the condenser 402.

[0029] like Figure 3 As shown, the membrane separation unit 2 consists of multiple separation sections connected in series. Each separation section includes a first housing 201, within which two spacers 202 are fixed, dividing the first housing 201 into a first side channel 203, a second side channel 205, and a central channel 204. An inlet 206 and a waste outlet 207 are fixed to both sides of the first housing 201, respectively, and the inlet 206 and waste outlet 207 communicate with the first side channel 203 and the second side channel 205, respectively. The central channel 204... Multiple cylindrical separation membranes 208 are provided inside the 04. The two ends of the separation membranes 208 are fixed to two spacers 202 respectively, and the two ends of the separation membranes 208 are connected to the first side groove 203 and the second side groove 205 respectively. The inlet 206 and the outlet 207 of two adjacent separation sections are fixedly connected. A pump body 209 is installed on the top of the first housing 201. The inlet end of the pump body 209 is connected to the middle groove 204, and the outlet end of the pump body 209 is fixedly connected to a conveying pipe 210. The conveying pipe 210 is connected to the catalytic dehydrogenation unit 3.

[0030] The separation membrane 208 in the membrane separation unit 2 is composed of a polyimide membrane and a supporting skeleton. By utilizing the high selective permeation characteristics of the polyimide membrane for helium and hydrogen, the concentration of helium and hydrogen in the raw gas (flash vapor) is concentrated, and impurities such as nitrogen and methane are removed.

[0031] In practice, the raw material gas enters from the inlet 206 of a separation section, passes through the first side tank 203, and is then split into multiple separation membranes 208. While flowing through the separation membranes 208, the pump body 209 draws gas from the middle tank 204. Helium and hydrogen in the raw material gas enter the middle tank 204, and the pump body 209 inputs the separated gas into the delivery pipe 210. The gas is then input into the catalytic dehydrogenation unit 3 for further processing. The gas that enters the second side tank 205 through the separation membrane 208 is discharged into the next separation section through the exhaust port 207. After being separated in stages by multiple series separation sections, the gas is discharged from the exhaust port 207 of the last separation section.

[0032] like Figure 4 As shown, the catalytic dehydrogenation unit 3 includes a second housing 301; one side of the second housing 301 is fixedly connected to the conveying pipe 210, and the other side of the second housing 301 is connected to the dewatering unit 4. A plurality of carrier plates 302 are fixed inside the second housing 301, and the second housing 301 is divided into spiral channels by the plurality of carrier plates 302. A heater is provided inside the carrier plate 302, and a catalyst part 303 is provided on the carrier plate 302. A plurality of protrusions 3031 are evenly distributed on the catalyst part 303.

[0033] The catalytic unit 303 uses a platinum-based catalyst, and the protrusions 3031 are set to increase the contact area in the gas catalytic dehydrogenation process, which facilitates catalysis.

[0034] In practice, the raw material gas entering the second housing 301 flows through a spiral channel and passes sequentially through the catalytic section 303 on multiple carrier plates 302. It is heated in conjunction with the heater inside the carrier plate 302, so that the hydrogen in the raw material gas is catalytically oxidized and converted into water vapor.

[0035] like Figure 5 As shown, the dehydration unit 4 also includes a desiccant layer 403 disposed inside the top of the cylinder 401; a connection port 404 is provided on one side of the bottom of the cylinder 401, and the connection port 404 is fixedly connected to one side of the second housing 301; a drain port 4011 is provided at the bottom end of the cylinder 401, and an opening and closing mechanism 10 is provided below the drain port 4011; the top end of the cylinder 401 is fixedly connected to the first connecting pipe 7.

[0036] Multiple evenly distributed and vertically arranged fine holes are provided on the desiccant layer 403 to allow airflow to pass through.

[0037] The bottom and top ends of the condenser cylinder 402 are respectively fixedly connected to an inlet pipe 4021 and an outlet pipe 4022, and both the inlet pipe 4021 and the outlet pipe 4022 are fixed to the cylinder body 401, extending outside the cylinder body 401. The inlet pipe 4021 and the outlet pipe 4022 are connected to an external cold liquid supply device, allowing cold liquid to circulate inside the condenser cylinder 402.

[0038] like Figure 2 and Figure 5 As shown, a flow guide shroud 9 is provided at the bottom of the cylinder 401, and the flow guide shroud 9 is fixed on the support platform 1, with the bottom end of the flow guide shroud 9 passing through the support platform 1.

[0039] After being processed by the catalytic dehydrogenation unit 3, the raw gas enters the cylinder 401 through the connection port 404. After passing through the condenser cylinder 402, the water vapor is condensed into liquid water. Then it passes through the desiccant layer 403, where the desiccant further removes water. The condensed liquid water drips into the bottom of the cylinder 401.

[0040] like Figure 5 and Figure 9As shown, the lifting part 11 includes a long shell 1101 fixedly installed on the side wall of the cylinder 401. A top seat 1102 and a base 1103 are fixed inside the top and bottom of the long shell 1101, respectively. A stud 1105 is rotatably installed between the top seat 1102 and the base 1103. A motor 1104 is fixed outside the top of the long shell 1101. The output shaft of the motor 1104 is fixed to one end of the stud 1105. A movable seat 1106 is threaded onto the stud 1105. The movable seat 1106 is slidably installed inside the long shell 1101. The adjusting component 16 is installed on the movable seat 1106.

[0041] The motor 1104 drives the stud 1105 to rotate, and the stud 1105 and the movable seat 1106 are driven by threads. The long shell 1101 provides vertical guidance for the movable seat 1106, so that the movable seat 1106 drives the scraper ring 12 on one side and the adjustment component 16 to move up and down together.

[0042] like Figure 5 and Figure 7 As shown, the opening and closing mechanism 10 includes a sealing plate 1001 disposed at the bottom of the drain outlet 4011. A sealing gasket 1002 is disposed on the sealing plate 1001. Both ends of the sealing plate 1001 are elastically connected to the top surface of the support platform 1 through a first spring 1003. A connecting rod 1004 is fixed to the top of the sealing plate 1001. The connecting rod 1004 passes through a hole opened at the bottom of the cylinder 401, and a pressure seat 1005 is fixed to the top of the connecting rod 1004. A corrugated hose 1006 is sleeved on the connecting rod 1004. The bottom end of the corrugated hose 1006 is fixedly sleeved with the hole, and the top end of the corrugated hose 1006 is fixed to the bottom surface of the pressure seat 1005. A pressing seat 13 is disposed on the top of the pressure seat 1005, and the pressing seat 13 is fixed to the movable seat 1106. The corrugated hose 1006 is designed to completely seal the orifice, while the corrugated hose 1006 is flexible and does not hinder the up-and-down movement of the connecting rod 1004.

[0043] When the movable seat 1106 in the lifting part 11 is in the high position, the pressing seat 13 and the pressure seat 1005 are separated. During the process of the lifting part 11 driving the movable seat 1106 and the pressing seat 13 on the movable seat 1106 to move downward to the low position, the pressing seat 13 pushes the pressure seat 1005 downward. The pressure seat 1005, the connecting rod 1004 and the sealing plate 1001 move downward together and increase the compression of the first spring 1003. The sealing gasket 1002 separates from the drain port 4011, so that the drain port 4011 opens automatically. The water in the cylinder 401 can be discharged through the drain port 4011 and fall into the guide shroud 9, and finally flow out from the bottom of the guide shroud 9.

[0044] During the process of the lifting unit 11 driving the movable seat 1106 and the pressing seat 13 on the movable seat 1106 to move upward to the high position, the pressing seat 13 separates from the pressure receiving seat 1005. The compression force of the first spring 1003 pushes the pressure receiving seat 1005, the connecting rod 1004, and the sealing plate 1001 upward together, causing the sealing gasket 1002 to press against the drain outlet 4011, thus achieving automatic closure. Figure 7 As shown; it should be noted that, in Figure 7 In the state shown, the first spring 1003 is in a compressed state, and the compression force causes the sealing gasket 1002 to press against the drain outlet 4011, ensuring a sealing effect.

[0045] The adsorption unit consists of multiple adsorption towers 5, which are arranged in parallel. The gas discharged from the water removal unit 4 is diverted to the adsorption tower 5 through the first connecting pipe 7 (the first connecting pipe 7 is a multi-way pipe, for example, when two adsorption towers 5 are set, the first connecting pipe 7 is a three-way pipe) and is adsorbed by the adsorption tower 5.

[0046] The adsorption tower 5 is filled with an adsorbent that selectively adsorbs impurities such as nitrogen, methane, and oxygen to remove impurities from the feed gas. Specifically, the adsorbent is a combination of 5A molecular sieve and activated carbon. Nitrogen and oxygen are selectively adsorbed by the molecular sieve, and finally, hydrocarbons such as methane are removed by the activated carbon.

[0047] like Figures 12-13 As shown, the low-temperature refining unit 6 includes a third housing 601. The bottom of the third housing 601 is connected to the bottom of the adsorption tower 5 through a second connecting pipe 8. A plurality of coils 602 are uniformly arranged inside the third housing 601. The coils 602 are used to supply low-temperature coolant. An exhaust port 603 is provided at the top of the third housing 601.

[0048] Liquid nitrogen coolant flows through coil 602. Gas entering the third shell 601 comes into contact with coil 602, causing residual trace amounts of methane and nitrogen to be further condensed and removed, increasing the concentration of helium discharged from exhaust port 603.

[0049] like Figure 6 as well as Figures 8-11As shown, the adjustment assembly 16 includes a trapezoidal block 1604 and a slide rail 1602 fixedly installed on the side wall of the movable seat 1106. Two connecting seats 1601 are slidably installed on the slide rail 1602, and the two connecting seats 1601 are respectively fixed to the first scraper 1201 and the second scraper 1202. A wedge block 1603 is fixed to the bottom of each of the two connecting seats 1601, and the two wedge blocks 1603 are symmetrically arranged on both sides of the trapezoidal block 1604. The trapezoidal block 1604 is an isosceles trapezoid, and its two sides are respectively in contact with the two wedge blocks 1603. An end plate 1608 is elastically connected to the third spring 1607, and the end plate 1608 is fixed to the side wall of the movable seat 1106. A bottom rod 1605 is fixed to the bottom of the trapezoidal block 1604, and a sleeve plate 1610 is sleeved on the bottom rod 1605. The sleeve plate 1610 is fixed to the side wall of the movable seat 1106. The sleeve plate 1610 is elastically connected to the bottom rod 1605 through a second spring 1606. A locking part is provided at the top of the connecting seat 1601, and an unlocking part is provided at the top of the locking part. A first stop block 14 is fixed to the top of the base 1103, and the first stop block 14 is located at the bottom of the bottom rod 1605.

[0050] The locking part includes a strip seat 1613 fixed to the side wall of the movable seat 1106. The bottom of both ends of the strip seat 1613 is provided with positioning grooves 1614. The top of the two connecting seats 1601 is fixed with a sleeve seat 1609. The sleeve seat 1609 is slidably sleeved with the positioning seat 1611, and the bottom of the positioning seat 1611 is elastically connected to the connecting seat 1601 through a fourth spring 1612.

[0051] The unlocking part includes a push base 1615. The top of the strip seat 1613 is provided with a guide groove, which is aligned with and communicates with the positioning groove 1614. The push base 1615 is slidably connected to the guide groove. The top of the push base 1615 is provided with a third stop 1618 fixed to the side wall of the movable seat 1106. The push base 1615 is elastically connected to the top of the strip seat 1613 through a fifth spring 1617. One side of the push base 1615 is bent downward to form a side seat 1616. The top of the push base 1615 is provided with a second stop 15, which is fixed to the top seat 1102.

[0052] The movable seat 1106 drives the scraper ring 12 to move downward, scraping off the water adhering to the condenser cylinder 402, and the opening and closing mechanism 10 opens the drain port 4011 by pressing the seat 13. During the above process, the movable seat 1106, the adjusting component 16, and the scraper ring 12 move together towards the first stop 14. The bottom rod 1605 is blocked by the first stop 14, causing the bottom rod 1605 to be pushed. The bottom rod 1605 drives the trapezoidal block 1604 to move upward about the movable seat 1106. The trapezoidal block 1604 pushes the wedge block 1603. The wedge block 1603 drives the first scraper 1201 and the second scraper through the connecting seat 1601. The first scraper 1201 and the second scraper 1202 move away from each other and compress the third spring 1607. The first scraper 1201 and the second scraper 1202 separate from the wall of the condenser cylinder 402. At the same time, the sleeve 1609, the positioning seat 1611 and the fourth spring 1612 above the connecting seat 1601 move together. The positioning seat 1611 moves to the bottom of the positioning groove 1614. The elastic force of the fourth spring 1612 causes the positioning seat 1611 to be inserted into the positioning groove 1614 for positioning. During the subsequent upward movement of the driving movable seat 1106, the first scraper 1201 and the second scraper 1202 remain separated from the condenser cylinder 402.

[0053] When the movable seat 1106 moves upward, the bottom rod 1605 separates from the first stop 14. The trapezoidal block 1604 is reset by the elastic force of the second spring 1606. At the same time, the push seat 1615 of the unlocking part moves closer to the second stop 15. The push seat 1615 is blocked by the second stop 15, causing the push seat 1615 to be pushed down. The push seat 1615 moves downward about the movable seat 1106 until the side seat 1616 abuts against the top of the strip seat 1613 and compresses the fifth spring 1617. After the push seat 1615 moves downward, the bottom surface of the push seat 1615 is flush with the bottom surface of the strip seat 1613. During the downward movement of the push seat 1615, the positioning seat 1611 is pushed out of the positioning groove 1614, thus unlocking.

[0054] After unlocking, the wedge block 1603 and the connecting seat 1601 are reset by the elastic force of the third spring 1607, and the connecting seat 1601 drives the first scraper 1201 and the second scraper 1202 to adhere to the wall of the condenser cylinder 402; when the driving movable seat 1106 moves downward, the push seat 1615 separates from the second stop 15, and the push seat 1615 is reset by the elastic force of the fifth spring 1617, and the push seat 1615 abuts against the third stop 1618.

[0055] Through the above design, after the drive scraper ring 12 moves to the low position, the first scraper 1201 and the second scraper 1202 automatically separate from the condenser cylinder 402 and lock the separated state, ensuring that the scraper ring 12 does not rub against the condenser cylinder 402 during the process of resetting to the high position, reducing unnecessary wear; after the scraper ring 12 moves to the high position, the first scraper 1201 and the second scraper 1202 automatically come into contact with the condenser cylinder 402, ensuring the squeegee effect during the subsequent downward movement; at the same time, the adjustment and movement of the first scraper 1201 and the second scraper 1202 do not require an additional power source to drive them, as they are pushed by the first stop block 14 and the second stop block 15 when they are raised or lowered to the high or low position, thus providing power.

[0056] This invention is not limited to the embodiments described above. Any changes made to their shape or structure fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications fall within the protection scope of this invention.

Claims

1. A helium extraction device for separating flash vapor from liquefied natural gas, comprising a support platform (1); characterized in that: The top of the support platform (1) is provided with a membrane separation unit (2), a catalytic dehydrogenation unit (3), a water removal unit (4), an adsorption unit, and a low-temperature purification unit (6); the catalytic dehydrogenation unit (3) is connected to the membrane separation unit (2) and the water removal unit (4) on both sides respectively; the water removal unit (4) is connected to the adsorption unit through a first connecting pipe (7), and the adsorption unit is connected to the low-temperature purification unit (6) through a second connecting pipe (8); The catalytic dehydrogenation unit (3) is used to convert hydrogen in flash vapor into water vapor; The dewatering unit (4) includes a cylinder (401) fixed to the top of the support platform (1), a condenser (402) is provided inside the cylinder (401), and a scraper (12) is sleeved on the condenser (402), and the scraper (12) is connected to a lifting part (11). The scraper ring (12) is composed of a first scraper (1201) and a second scraper (1202). The first scraper (1201) and the second scraper (1202) are connected to an adjustment component (16). The adjustment component (16) is used to make the first scraper (1201) and the second scraper (1202) leave the condenser cylinder wall or adhere to the condenser cylinder wall. A connection port (404) is provided on one side of the bottom of the cylinder (401), and the connection port (404) is fixedly connected to one side of the second shell (301). A drain port (4011) is provided at the bottom of the cylinder (401), and an opening and closing mechanism (10) is provided below the drain port (4011). The top of the cylinder (401) is fixedly connected to the first connecting pipe (7). The lifting unit (11) includes a long shell (1101) fixedly installed on the side wall of the cylinder (401). A top seat (1102) and a base (1103) are fixedly installed inside the top and bottom of the long shell (1101), respectively. A stud (1105) is rotatably installed between the top seat (1102) and the base (1103). A motor (1104) is fixedly installed outside the top of the long shell (1101). The output shaft of the motor (1104) is fixed to one end of the stud (1105). A movable seat (1106) is threadedly connected to the stud (1105). The movable seat (1106) is slidably installed inside the long shell (1101). The adjusting component (16) is installed on the movable seat (1106). The opening and closing mechanism (10) includes a sealing plate (1001) disposed at the bottom of the drain outlet (4011), a sealing gasket (1002) disposed on the sealing plate (1001), both ends of the sealing plate (1001) being elastically connected to the top surface of the support platform (1) by a first spring (1003), a connecting rod (1004) fixed to the top of the sealing plate (1001), the connecting rod (1004) passing through a hole opened at the bottom of the cylinder (401), and a pressure seat (1005) fixed to the top of the connecting rod (1004), a corrugated hose (1006) sleeved on the connecting rod (1004), the bottom end of the corrugated hose (1006) being fixedly sleeved with the hole, and the top end of the corrugated hose (1006) being fixed to the bottom surface of the pressure seat (1005); the pressure seat (1005) being fixed to the bottom surface of the support platform (1005); the pressure seat (1006) being fixed to the bottom surface of the support platform (1005) is also fixed to the opening. A pressing seat (13) is provided on the top of the pressing seat (1005), and the pressing seat (13) is fixed to the movable seat (1106); when the movable seat (1106) in the lifting part (11) is in a high position, the pressing seat (13) is separated from the pressure seat (1005); during the process of the lifting part (11) driving the movable seat (1106) and the pressing seat (13) on the movable seat (1106) to move down to a low position, the pressing seat (13) pushes down the pressure seat (1005), the pressure seat (1005), the connecting rod (1004) and the sealing plate (1001) move down together and increase the compression of the first spring (1003), the sealing gasket (1002) separates from the drain outlet (4011), so that the drain outlet (4011) opens automatically; The adjustment component (16) includes a trapezoidal block (1604) and a slide rail (1602) fixedly installed on the side wall of the movable seat (1106). Two connecting seats (1601) are slidably installed on the slide rail (1602), and the two connecting seats (1601) are respectively fixed to the first scraper (1201) and the second scraper (1202). A wedge block (1603) is fixed to the bottom of each of the two connecting seats (1601), and the two wedge blocks (1603) are symmetrically arranged on both sides of the trapezoidal block (1604). The trapezoidal block (1604) is an isosceles trapezoid, and the two sides of the trapezoidal block (1604) are respectively attached to the two wedge blocks (1603). The wedge blocks (1603) are connected by the first scraper (1604) and the second scraper (1602). Three springs (1607) are elastically connected to an end plate (1608), and the end plate (1608) is fixed to the side wall of the movable seat (1106). The bottom of the trapezoidal block (1604) is fixed to a bottom rod (1605), and a sleeve plate (1610) is sleeved on the bottom rod (1605). The sleeve plate (1610) is fixed to the side wall of the movable seat (1106). The sleeve plate (1610) is elastically connected to the bottom rod (1605) through a second spring (1606). The top of the connecting seat (1601) is provided with a locking part, and the top of the locking part is provided with an unlocking part. The top of the base (1103) is fixed with a first stop block (14), and the first stop block (14) is located at the bottom of the bottom rod (1605). The locking part includes a strip seat (1613) fixed on the side wall of the movable seat (1106). The bottom of both ends of the strip seat (1613) are provided with positioning grooves (1614). The top of the two connecting seats (1601) is fixed with a sleeve seat (1609). The sleeve seat (1609) is slidably sleeved with the positioning seat (1611). The bottom of the positioning seat (1611) is elastically connected to the connecting seat (1601) through a fourth spring (1612). The unlocking part includes a push seat (1615), the top of the strip seat (1613) is provided with a guide groove, the guide groove is aligned with and connected to the positioning groove (1614), the push seat (1615) is slidably connected to the guide groove, the top of the push seat (1615) is provided with a third stop (1618) fixed on the side wall of the movable seat (1106), and the push seat (1615) is elastically connected to the top of the strip seat (1613) through a fifth spring (1617), one side of the push seat (1615) is bent downward to form a side seat (1616); the top of the push seat (1615) is provided with a second stop (15), and the second stop (15) is fixed to the top seat (1102).

2. The helium extraction device for separating flash vapor from liquefied natural gas as described in claim 1, characterized in that: The membrane separation unit (2) is composed of multiple separation sections; each separation section includes a first housing (201), which has two spacers (202) fixed inside, and is divided into a first side channel (203), a second side channel (205), and a central channel (204) by the two spacers (202); an inlet (206) and a waste outlet (207) are fixed on both sides of the first housing (201), and the inlet (206) and the waste outlet (207) are respectively connected to the first side channel (203) and the second side channel (205). The middle tank (204) is provided with a plurality of cylindrical separation membranes (208), the two ends of the separation membranes (208) are respectively connected to the first side tank (203) and the second side tank (205); the inlet (206) and the outlet (207) of two adjacent separation sections are fixedly connected; a pump body (209) is installed on the top of the first housing (201), the inlet end of the pump body (209) is connected to the middle tank (204), and the outlet end of the pump body (209) is fixedly connected to a conveying pipe (210), which is connected to the catalytic dehydrogenation unit (3).

3. The helium extraction device for separating flash vapor from liquefied natural gas as described in claim 2, characterized in that: The catalytic dehydrogenation unit (3) includes a second housing (301); one side of the second housing (301) is fixedly connected to the conveying pipe (210), and the other side of the second housing (301) is connected to the dewatering unit (4). Multiple carrier plates (302) are fixed inside the second housing (301). The second housing (301) is divided into spiral channels by multiple carrier plates (302). A heater is provided inside the carrier plate (302), and a catalyst part (303) is provided on the carrier plate (302). Multiple protrusions (3031) are evenly distributed on the catalyst part (303).

4. The helium extraction device for separating flash vapor from liquefied natural gas as described in claim 3, characterized in that: The dehydration unit (4) also includes a desiccant layer (403) disposed in the top of the cylinder (401).

5. The helium extraction device for separating flash vapor from liquefied natural gas as described in claim 1, characterized in that: The low-temperature refining unit (6) includes a third housing (601), in which a plurality of coils (602) are uniformly arranged. The coils (602) are used to supply low-temperature coolant. An exhaust port (603) is provided on the top of the third housing (601).

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