CN219149713U - Helium gas extraction system - Google Patents
Helium gas extraction system Download PDFInfo
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- CN219149713U CN219149713U CN202320112649.7U CN202320112649U CN219149713U CN 219149713 U CN219149713 U CN 219149713U CN 202320112649 U CN202320112649 U CN 202320112649U CN 219149713 U CN219149713 U CN 219149713U
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- 239000001307 helium Substances 0.000 title claims abstract description 196
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 196
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 239000007789 gas Substances 0.000 title claims abstract description 80
- 238000000605 extraction Methods 0.000 title claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 164
- 239000012528 membrane Substances 0.000 claims abstract description 140
- 238000000926 separation method Methods 0.000 claims abstract description 113
- 239000003345 natural gas Substances 0.000 claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000000047 product Substances 0.000 claims abstract description 17
- 238000000746 purification Methods 0.000 claims abstract description 17
- 239000012466 permeate Substances 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 3
- 239000003949 liquefied natural gas Substances 0.000 description 52
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000009835 boiling Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
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- 229910052757 nitrogen Inorganic materials 0.000 description 3
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- 229910001868 water Inorganic materials 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
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- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
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- 239000004215 Carbon black (E152) Substances 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
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- 239000001273 butane Substances 0.000 description 1
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- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a helium extraction system. The system comprises a membrane separation helium concentration system, an LNG factory and a helium purification system which are sequentially connected through pipelines; the membrane separation helium concentrating system is arranged to remove or partially remove non-permeate gas in helium-containing natural gas to obtain product gas; the LNG factory is arranged to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system is configured to process BOG produced by the LNG plant to obtain helium. According to the utility model, helium is extracted from a natural gas source, and the downstream LNG factory is skillfully combined, so that the natural gas treatment capacity is 5-10 times, even 10-40 times, of the original LNG factory treatment capacity, and the efficiency is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of helium separation and purification, and relates to a helium extraction system.
Background
Helium (He) is a rare gas, colorless and odorless, has inactive chemical properties, is difficult to react with other substances in a general state, is widely applied to the high-tech fields of semiconductor manufacturing, aerospace, medical health and the like, and gradually expands market demands.
Helium is mainly distributed in the mantle, air, ore and natural gas. The helium content in the air is very small and is only 5ppm; in helium-enriched natural gas, the concentration of helium is 0.02% -5%, namely 200-50000 mmp. Thus, the extraction of helium from natural gas is a major industrial source thereof.
Liquefied natural gas (Liquefied Natural Gas, LNG for short) is a form of natural gas, the main component of which is methane, and is recognized as the cleanest fossil energy source on earth. Colorless, odorless, nontoxic and noncorrosive, and has a volume of about 1/625 of the volume of the same amount of gaseous natural gas, and the mass of liquefied natural gas is only about 45% of the same volume of water. During LNG production from LNG plants, a certain amount of Boil Off Gas (BOG) is produced. Helium is present in BOG at a higher concentration (up to 15%). The BOG mainly comprises He (boiling point: 268.9 ℃) and CH 4 (boiling point: 161.5 ℃ C.) N 2 (boiling point: 195.8 ℃ C.) H 2 (boiling point: 253 ℃ C.) O 2 (boiling point: minus 183 ℃ C.), ar (boiling point: minus 185.9 ℃ C.), etc.
Currently, the main methods for extracting helium from natural gas are a Pressure Swing Adsorption (PSA) method, an absorption method, a membrane separation method and a cryogenic method. The pressure swing adsorption method uses molecular sieve as adsorbent and adopts the principle of separating gas mixture by utilizing the difference of adsorption property of molecular sieve to different gas molecules. The membrane separation method utilizes the characteristic that some metal membranes or organic membranes have selective permeation and diffusion to some gas components to achieve the purposes of gas separation and purification. The method takes the partial pressure difference of the gases at two sides of the membrane as the driving force, and realizes the separation by the steps of dissolution, diffusion, permeation, desorption and the like to generate the difference of the transfer rates among the components. The cryogenic process, also called low temperature condensation adsorption process, is a process for extracting helium by cryogenic distillation, which is generally provided by atmospheric liquid nitrogen, and can produce helium with purity of 99.99%. The pressure swing adsorption method and the membrane separation method do not need low-temperature condensation and then gas separation, so the method is superior to the cryogenic method in energy consumption and material consumption.
The LNG production capacity of LNG plants varies according to the scale, but has an upper limit ranging from 4 to 400 thousand cubic meters per day, so that the extraction of helium from natural gas is limited by the LNG production capacity, and how to break through the limitation becomes a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a helium extraction system, which comprises a membrane separation helium concentration system, an LNG factory and a helium purification system which are sequentially connected through pipelines; the membrane separation helium concentrating system is arranged to remove or partially remove non-permeate gas in helium-containing natural gas to obtain product gas; the LNG factory is arranged to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system is configured to process BOG produced by the LNG plant to obtain helium.
In some embodiments, the membrane separation helium enrichment system comprises a primary membrane separation system for treating helium-containing natural gas having a helium concentration of 500ppm or more such that the helium concentration is increased by a factor of 5 to 10 before treatment; the permeate gas outlet of the primary membrane separation system is connected with an LNG plant.
In some embodiments, the membrane separation helium concentration system comprises a primary membrane separation system, a compressor and a secondary membrane separation system which are sequentially connected through pipelines and are used for treating helium-containing natural gas with helium concentration of more than or equal to 200ppm and less than 500ppm, so that the helium concentration is increased by 10-40 times before treatment; and a permeate gas outlet of the secondary membrane separation system is connected with the LNG factory.
In some embodiments, the membrane separation helium enrichment system comprises a primary membrane separation system, a compressor and a secondary membrane separation system which are sequentially connected through a pipeline, and further comprises a first valve and a second valve; the first valve is arranged on a connecting pipeline between the primary membrane separation system and the LNG factory; the second valve is arranged on a connecting pipeline of the primary membrane separation system and the compressor;
the workflow of the membrane separation helium enrichment system is set as follows: under the condition that the helium concentration in the helium-containing natural gas is greater than or equal to 500ppm, closing the second valve, and opening the first valve, so that the helium-containing natural gas directly enters the LNG plant through the primary membrane separation system; and in the case that the helium concentration in the helium-containing natural gas is greater than or equal to 200ppm and less than 500ppm, closing the first valve, and opening the second valve, so that the helium-containing natural gas enters the LNG factory through the primary membrane separation system, the compressor and the secondary membrane separation system.
In some embodiments, a helium concentration monitoring system is also included for monitoring the concentration of helium in helium-containing natural gas entering the primary membrane separation system.
In some embodiments, the system further comprises a control system in communication with the helium concentration monitoring system, wherein the control system is used for controlling the opening and closing of the first valve and the second valve according to the helium concentration in the helium-containing natural gas monitored by the helium concentration monitoring system, so as to help complete the workflow of the membrane separation helium concentration system, specifically:
under the condition that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 500ppm, the control system closes the second valve and opens the first valve, so that the helium-containing natural gas directly enters the LNG factory through the primary membrane separation system; and under the condition that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 200ppm and less than 500ppm, the control system closes the first valve and opens the second valve, so that the helium-containing natural gas enters the LNG factory through the primary membrane separation system, the compressor and the secondary membrane separation system.
In some embodiments, the secondary membrane separation system is further in piping connection with the gas inlet of the primary membrane separation system such that the non-permeate gas produced by the secondary membrane separation system can be recovered for re-concentration via the membrane separation helium concentration system.
In some embodiments, the primary membrane separation system may concentrate helium by a factor of 5 to 10.
In some embodiments, the primary membrane separation system and the secondary membrane separation system cooperate to concentrate helium by a factor of 10 to 40.
In some embodiments, the compressor may compress gas to a pressure 0.2MPa above the primary membrane inlet pressure in the primary membrane separation system, facilitating the return of secondary membrane tail gas in the secondary membrane separation system to the primary membrane inlet; and if the pressure of the primary membrane inlet reaches 10MPa, controlling the pressure of the secondary membrane inlet of the secondary membrane separation system to be 10MPa, and returning the tail gas of the secondary membrane to the primary membrane inlet in a pressurizing way, wherein the pressurizing is not more than 0.2MPa.
The beneficial effects of the utility model include:
1. according to the utility model, the concentration of helium in natural gas is increased by 5-10 times through primary membrane separation, the volume is reduced to 1/5-1/10 of the original volume, the natural gas is used as raw material gas to enter an LNG factory for producing LNG, and the BOG gas concentration is 5-10 times that of the natural gas directly used as the raw material.
2. The helium concentration in the natural gas is increased by 10-40 times through the secondary membrane separation, the volume is reduced to 1/10-1/40 of the original volume, the natural gas is used as the raw material gas to enter an LNG factory for producing LNG, and the BOG gas concentration is 10-40 times that of the natural gas directly used as the raw material.
3. Compared with the technology of directly extracting helium from natural gas, the technology can greatly reduce helium extracting cost, and normal use of the original natural gas is not affected. Is suitable for the situation that the natural gas quantity is 5 to 10 times or 10 to 40 times larger than the treatment capacity of the LNG factory.
4. Once the technology is popularized, the problems of low helium concentration and high helium extraction cost in natural gas in China can be solved, and the technology is economically feasible for extracting helium from natural gas with helium concentration of more than 500ppm or more than 200ppm and less than 500 ppm.
5. The helium concentration monitoring system and the control system are arranged so that the utility model can automatically treat different helium-containing natural gases.
6. The helium recovery rate of the utility model is more than 95%; the natural gas pressure is less than 10Mpa; the operation temperature is about 50 ℃; the flow rate is not limited. The raw material gas is heated to about 50 ℃ and then enters a membrane separation helium concentration system.
According to the utility model, helium is extracted from a natural gas source, and the downstream LNG factory is skillfully combined, so that the natural gas treatment capacity is 5-10 times, even 10-40 times, of the original LNG factory treatment capacity, and the efficiency is greatly improved. The utility model is seemingly simple, wherein the LNG factory and the helium purification system are both in the prior art, but the combination of the LNG factory and the helium purification system with the membrane separation helium concentration system has very large and unexpected technical effects, solves the problem that the LNG factory is limited in producing helium and natural gas, and greatly improves the productivity.
The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.
Drawings
Fig. 1 is a schematic structural view of a helium gas extraction system according to embodiment 1 of the present utility model.
Fig. 2 is a schematic structural view of a helium gas extraction system according to embodiment 2 of the present utility model.
Fig. 3 is a schematic structural view of a helium gas extraction system according to embodiment 3 of the present utility model.
Detailed Description
The utility model is further described with reference to the following detailed description in order to make the technical means, the inventive features, the achieved objects and the effects of the utility model easy to understand. The present utility model is not limited to the following examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model.
"LNG" is natural gas that is generally known to include a high percentage of methane. LNG may also include trace amounts of other compounds or elements such as ethane, propane, butane, carbon dioxide, nitrogen, helium, hydrogen sulfide, or combinations thereof. LNG plants process natural gas to remove one or more components (e.g., helium) or impurities (e.g., water and/or heavy hydrocarbons) and then condense to a liquid by cooling at near atmospheric pressure when producing LNG.
"Natural gas" refers to a multi-component gas obtained from a crude oil well or a subterranean gas producing formation. The composition and pressure of natural gas can vary significantly. Typical natural gas contains methane as a major component, i.e. the methane content exceeds 50%. Natural gas may also contain ethane, higher molecular weight hydrocarbons (e.g., C 3 -C 20 Hydrocarbon), one or more acid gases (e.g., carbon dioxide or hydrogen sulfide), or any combination thereof. Natural gas may also include small amounts of magazines such as water, nitrogen, iron sulfide, wax, crude oil, or any combination thereof.
Example 1
Fig. 1 shows a helium extraction system of the present embodiment, which includes a membrane separation helium concentration system, an LNG plant 6, and a helium purification system 7, which are sequentially connected by pipes, and a helium concentration monitoring system and a control system in communication with the helium concentration monitoring system. The membrane separation helium concentrating system is arranged to remove or partially remove non-permeate gas in helium-containing natural gas to obtain product gas; the LNG plant 6 is configured to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system 7 is arranged to process BOG produced by the LNG plant 6 to obtain helium, i.e. high purity helium in fig. 1.
The membrane separation helium gas concentration system comprises a primary membrane separation system 1, a compressor 4 and a secondary membrane separation system 5 which are sequentially connected through pipelines, and further comprises a first valve 2 and a second valve 3. The first valve 2 is arranged on a connecting pipeline between the primary membrane separation system 1 and the LNG factory 6; the second valve 3 is arranged on a connecting pipeline of the primary membrane separation system 1 and the compressor 4.
The helium concentration monitoring system is used for monitoring the concentration of helium in helium-containing natural gas entering the primary membrane separation system. The control system is used for controlling the opening and closing of the first valve 2 and the second valve 3 according to the helium concentration in the helium-containing natural gas monitored by the helium concentration monitoring system, so as to help to complete the work flow of the membrane separation helium concentration system, and specifically comprises the following steps:
under the condition that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 500ppm, the control system closes the second valve 3 and opens the first valve 2, so that the helium-containing natural gas directly enters the LNG factory 6 through the primary membrane separation system 1; in the case that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 200ppm and less than 500ppm, the control system closes the first valve 2 and opens the second valve 3, so that the helium-containing natural gas enters the LNG factory 6 through the primary membrane separation system 1 via the compressor 4 and the secondary membrane separation system 5.
The secondary membrane separation system 5 is also connected with the air inlet of the primary membrane separation system 1 through a pipeline, so that the non-permeate gas generated by the secondary membrane separation system 5 can be recovered for concentration by the membrane separation helium concentration system again.
The compressor 4 can compress the gas to be 0.2MPa higher than the pressure of the primary membrane inlet in the primary membrane separation system, so that the tail gas of the secondary membrane in the secondary membrane separation system can be conveniently returned to the primary membrane inlet; if the pressure of the primary membrane inlet reaches 10MPa, the pressure of the secondary membrane inlet of the secondary membrane separation system is also controlled to be 10MPa, and the tail gas of the secondary membrane needs to be pressurized to return to the primary membrane inlet, wherein the pressure is not more than 0.2MPa. The helium recovery of this example was greater than 95%; the natural gas pressure is less than 10Mpa; the operation temperature is about 50 ℃; the flow rate is not limited.
Example 2
Fig. 2 shows a helium gas extraction system of the present embodiment, which includes a membrane separation helium enrichment system 8, an LNG plant 6, and a helium gas purification system 7 connected in order by pipes. The membrane separation helium enrichment system 8 is configured to remove or partially remove non-permeate gas from helium-containing natural gas to produce a product gas; the LNG plant 6 is configured to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system 7 is arranged to process BOG produced by the LNG plant 6 to obtain helium, i.e. high purity helium in fig. 2. The membrane separation helium concentration system 8 comprises a primary membrane separation system and is used for treating helium-containing natural gas with helium concentration of more than or equal to 500ppm, so that the helium concentration is increased to 5-10 times before treatment. The permeate gas outlet of the primary membrane separation system is connected to LNG plant 6. The helium recovery of this example was greater than 95%; the natural gas pressure is less than 10Mpa; the operation temperature is about 50 ℃; the flow rate is not limited.
Example 3
Fig. 3 shows a helium gas extraction system of the present embodiment, which includes a membrane separation helium enrichment system, an LNG plant 6, and a helium purification system 7 connected in order by pipes. The membrane separation helium concentrating system is arranged to remove or partially remove non-permeate gas in helium-containing natural gas to obtain product gas; the LNG plant 6 is configured to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system 7 is arranged to process BOG produced by the LNG plant 6 to obtain helium, i.e. high purity helium in fig. 3. The membrane separation helium gas concentration system comprises a primary membrane separation system 1, a compressor 4 and a secondary membrane separation system 5 which are sequentially connected through pipelines and is used for treating helium-containing natural gas with helium concentration of more than or equal to 200ppm and less than 500ppm, so that the helium concentration is improved to 10-40 times before treatment. The permeate gas outlet of the secondary membrane separation system 5 is connected to an LNG plant 6. The helium recovery of this example was greater than 95%; the natural gas pressure is less than 10Mpa; the operation temperature is about 50 ℃; the flow rate is not limited.
Example 4
This embodiment describes a helium extraction method comprising the steps of:
s1, carrying out membrane separation helium concentration on helium-containing natural gas, and removing or partially removing non-permeable gas to obtain product gas;
s2, using the product gas obtained in the step S1 to produce LNG in an LNG factory, and simultaneously producing and obtaining BOG;
s3, performing helium purification treatment on the BOG obtained in the step S2 to obtain helium.
Wherein, step S1 is divided into two cases:
1) Under the condition that the helium concentration in the helium-containing natural gas is more than or equal to 500ppm, carrying out membrane separation and helium concentration on the helium-containing natural gas through a primary membrane separation system, and removing or partially removing non-permeable gas to obtain product gas;
2) Under the condition that the helium concentration in helium-containing natural gas is more than or equal to 200ppm and less than 500ppm, the helium-containing natural gas is compressed by a compressor after passing through a primary membrane separation system, enters a secondary membrane separation system for membrane separation helium concentration, and non-permeate gas is removed or partially removed, so that product gas is obtained.
Wherein, the case 2) specifically is: under the condition that the helium concentration in the helium-containing natural gas is more than or equal to 200ppm and less than 500ppm, removing or partially removing the non-permeable gas separated by the primary membrane separation system after the helium-containing natural gas passes through the primary membrane separation system, then compressing the non-permeable gas by a compressor, and entering a secondary membrane separation system to perform membrane separation helium concentration to obtain product gas; and recycling the non-permeate gas separated by the primary membrane separation system and re-entering the primary membrane separation system for treatment.
The compressor can compress the gas to be 0.2MPa higher than the pressure of a primary membrane inlet in the primary membrane separation system, so that the tail gas of a secondary membrane in the secondary membrane separation system can be conveniently returned to the primary membrane inlet; if the pressure of the primary membrane inlet reaches 10MPa, the pressure of the secondary membrane inlet of the secondary membrane separation system is also controlled to be 10MPa, and the tail gas of the secondary membrane needs to be pressurized to return to the primary membrane inlet, wherein the pressure is not more than 0.2MPa. The helium recovery of this example was greater than 95%; the natural gas pressure is less than 10Mpa; the operation temperature is about 50 ℃; the flow rate is not limited.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (6)
1. A helium extraction system, comprising a membrane separation helium concentration system, an LNG plant and a helium purification system which are connected in sequence through pipelines; the membrane separation helium concentrating system is arranged to remove or partially remove non-permeate gas in helium-containing natural gas to obtain product gas; the LNG factory is arranged to treat the product gas as a gas to be treated to obtain LNG and BOG; the helium purification system is configured to process BOG produced by the LNG plant to obtain helium.
2. The helium extraction system of claim 1, wherein said membrane-separated helium enrichment system comprises a primary membrane separation system, a compressor, and a secondary membrane separation system connected in sequence by piping, further comprising a first valve and a second valve; the first valve is arranged on a connecting pipeline between the primary membrane separation system and the LNG factory; the second valve is arranged on a connecting pipeline of the primary membrane separation system and the compressor;
the workflow of the membrane separation helium enrichment system is set as follows: under the condition that the helium concentration in the helium-containing natural gas is greater than or equal to 500ppm, closing the second valve, and opening the first valve, so that the helium-containing natural gas directly enters the LNG plant through the primary membrane separation system; and in the case that the helium concentration in the helium-containing natural gas is greater than or equal to 200ppm and less than 500ppm, closing the first valve, and opening the second valve, so that the helium-containing natural gas enters the LNG factory through the primary membrane separation system, the compressor and the secondary membrane separation system.
3. The helium extraction system of claim 2 further comprising a helium concentration monitoring system for monitoring the concentration of helium in helium-containing natural gas entering said primary membrane separation system.
4. A helium extraction system according to claim 3 further comprising a control system in communication with said helium concentration monitoring system for controlling the opening and closing of said first valve and said second valve in response to the concentration of helium in helium-containing natural gas monitored by said helium concentration monitoring system to thereby assist in completing the workflow of said membrane separation helium concentration system, in particular:
under the condition that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 500ppm, the control system closes the second valve and opens the first valve, so that the helium-containing natural gas directly enters the LNG factory through the primary membrane separation system; and under the condition that the helium concentration monitoring system monitors that the helium concentration in the helium-containing natural gas is greater than or equal to 200ppm and less than 500ppm, the control system closes the first valve and opens the second valve, so that the helium-containing natural gas enters the LNG factory through the primary membrane separation system, the compressor and the secondary membrane separation system.
5. The helium extraction system of claim 2, wherein the secondary membrane separation system is further connected to an air inlet of the primary membrane separation system by a conduit such that non-permeate produced by the secondary membrane separation system can be recovered for re-concentration by the membrane separation helium concentration system.
6. The helium extraction system of any one of claims 2-5, wherein said compressor is operable to compress gas to a pressure of 0.2MPa above a primary membrane inlet pressure in said primary membrane separation system to facilitate a return of a secondary membrane tail gas in said secondary membrane separation system to said primary membrane inlet; and if the pressure of the primary membrane inlet reaches 10MPa, controlling the pressure of the secondary membrane inlet of the secondary membrane separation system to be 10MPa, and returning the tail gas of the secondary membrane to the primary membrane inlet in a pressurizing way, wherein the pressurizing is not more than 0.2MPa.
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| CN202320112649.7U CN219149713U (en) | 2023-01-20 | 2023-01-20 | Helium gas extraction system |
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| CN202320112649.7U CN219149713U (en) | 2023-01-20 | 2023-01-20 | Helium gas extraction system |
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