CN214087729U - Normal temperature natural gas helium extraction and purification system - Google Patents
Normal temperature natural gas helium extraction and purification system Download PDFInfo
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- CN214087729U CN214087729U CN202022751400.XU CN202022751400U CN214087729U CN 214087729 U CN214087729 U CN 214087729U CN 202022751400 U CN202022751400 U CN 202022751400U CN 214087729 U CN214087729 U CN 214087729U
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Abstract
The utility model discloses a normal temperature natural gas helium extraction and purification system, which comprises a primary membrane separator, a secondary first-stage membrane separator, a secondary second-stage membrane separator and a pressure swing adsorption unit; the permeation gas outlet of the first-stage membrane separator is connected with the compressor and then connected with the inlet of the second-stage first-stage membrane separator; the non-permeable gas outlet of the primary membrane separator is connected to a pipe network to continuously convey natural gas outwards; the permeation gas outlet of the second-stage first-stage membrane separator is connected with a compressor and then connected with a pressure swing adsorption unit to obtain high-purity helium; the non-permeate gas outlet of the second-stage first-stage membrane separator is connected with the inlet of the second-stage membrane separator; the system adopts very low energy consumption to purify helium in natural gas, can also purify helium in flash evaporation gas (BOG) in the process of liquefying natural gas, and has good application effect.
Description
Technical Field
The utility model relates to a gas separation field specifically is a normal atmospheric temperature natural gas helium draws purification system.
Background
With the rapid development of modern science and technology, helium is used as a non-renewable rare gas and is widely applied in the fields of medical treatment, electronics, national defense, military industry and the like, the content of helium in natural gas is very low, the energy consumption of a conventional low-temperature extraction process is huge, and the removal of part of impurities is difficult to control.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the normal-temperature natural gas helium extraction and purification system is provided, the helium in the natural gas is purified by adopting very low energy consumption, the helium in flash evaporation gas (BOG) in the process of liquefying the natural gas can also be purified, and the system has a good application effect.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a normal temperature natural gas helium extraction and purification system comprises a first-stage membrane separator (1), a second-stage first-stage membrane separator (7), a second-stage membrane separator (8) and a pressure swing adsorption unit (6); the permeation gas outlet of the first-stage membrane separator (1) is connected with the compressor (2) and then is connected with the inlet of the second-stage first-stage membrane separator (7); the non-permeable gas outlet of the primary membrane separator (1) is connected with a pipe network to continuously convey natural gas outwards; the permeation gas outlet of the second-stage first-stage membrane separator (7) is connected with the compressor (2) and then connected with the pressure swing adsorption unit (6) to obtain high-purity helium; the non-permeate gas outlet of the second-stage first-stage membrane separator (7) is connected with the inlet of the second-stage membrane separator (8); the permeation gas outlet of the second-stage membrane separator (8) is connected with the compressor (2) and then connected with the second-stage first-stage membrane separator (7); and a non-permeable gas outlet of the second-stage two-section membrane separator (8) is connected to a pipe network to continuously convey natural gas outwards.
Furthermore, a permeation gas outlet of the primary membrane separator (1) is connected with the compressor (2), then is connected with the dehydrogenation unit (3) and the decarburization unit (4) for rough treatment, and then is connected with an inlet of the secondary primary membrane separator (7).
Furthermore, a permeation gas outlet of the second-stage first-stage membrane separator (7) is connected with the compressor (2), then is connected with the dehydrogenation unit (3), is subjected to fine treatment, and then is connected with the pressure swing adsorption unit (6).
Furthermore, a permeating gas outlet of the first-stage membrane separator (1) is connected with a compressor (2) and then is connected with an inlet of a third-stage membrane separator (5), and a permeating gas outlet of the third-stage membrane separator (5) is connected with an inlet of a second-stage first-stage membrane separator (7) after being connected with the compressor (2); and a non-permeable gas outlet of the three-stage membrane separator (5) is connected with the compressor (2) and then is connected into a pipe network to continuously convey natural gas outwards.
Further, a desorption gas outlet of the decarburization unit (4) is connected into a pipeline network to continuously convey natural gas outwards.
Further, the non-permeable gas outlet of the second-stage membrane separator (8) is connected with the inlet of the third-stage membrane separator (5).
Further, a desorption gas outlet of the pressure swing adsorption unit (6) is connected with an outlet of the primary membrane separator (1) for circulation.
The utility model has the advantages that: the system solves the problem of high energy consumption of extracting and concentrating helium from natural gas and flash gas (BOG) in the natural gas liquefaction process, and adopts a normal-temperature process route to purify the helium.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of embodiment 1 of the system.
Fig. 2 is a block diagram of embodiment 2 of the system.
In the figure: 1. a primary membrane separator; 2. a compressor; 3. a dehydrogenation unit; 4. a decarbonization unit; 5. a tertiary membrane separator; 6. a pressure swing adsorption unit; 7. a second-stage first-stage membrane separator; 8. a second-stage two-section membrane separator.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, a system for extracting and purifying natural gas and helium at normal temperature, comprises a primary membrane separator 1, a secondary first-stage membrane separator 7, a secondary second-stage membrane separator 8 and a pressure swing adsorption unit 6; the desorbed gas outlet of the pressure swing adsorption unit 6 is connected with the outlet of the first-stage membrane separator 1 for circulation;
the permeation gas outlet of the first-stage membrane separator 1 is connected with the compressor 2 and then connected with the inlet of the second-stage first-stage membrane separator 7; the non-permeable gas outlet of the primary membrane separator 1 is connected to a pipe network to continuously convey natural gas outwards;
the permeation gas outlet of the second-stage first-stage membrane separator 7 is connected with the compressor 2 and then connected with the pressure swing adsorption unit 6 to obtain high-purity helium; the non-permeate gas outlet of the second-stage first-stage membrane separator 7 is connected with the inlet of a second-stage membrane separator 8;
the permeation gas outlet of the second-stage membrane separator 8 is connected with the compressor 2 and then connected with the second-stage first-stage membrane separator 7; and a non-permeable gas outlet of the second-stage two-section membrane separator 8 is connected to a pipe network to continuously convey natural gas outwards.
Example 2
As shown in fig. 2, comprises a first-stage membrane separator 1, a second-stage first-stage membrane separator 7, a second-stage membrane separator 8 and a pressure swing adsorption unit 6;
the permeation gas outlet of the primary membrane separator 1 is connected with a compressor 2, then connected with a dehydrogenation unit 3 and a decarburization unit 4 for rough treatment, and then connected with the inlet of a tertiary membrane separator 5, the permeation gas outlet of the tertiary membrane separator 5 is connected with the compressor 2, then connected with the inlet of a secondary primary membrane separator 7, and the non-permeation gas outlet of the primary membrane separator 1 is connected with a pipe network to continuously convey natural gas outwards; a desorption gas outlet of the decarburization unit 4 is connected to a pipe network to continuously convey natural gas outwards;
the permeation gas outlet of the second-stage first-stage membrane separator 7 is connected with the compressor 2, then is connected with the dehydrogenation unit 3 for fine treatment, and then is connected with the pressure swing adsorption unit 6 to obtain high-purity helium; the desorbed gas outlet of the pressure swing adsorption unit 6 is connected with the outlet of the first-stage membrane separator 1 for circulation; the non-permeate gas outlet of the second-stage first-stage membrane separator 7 is connected with the inlet of a second-stage membrane separator 8;
the permeation gas outlet of the second-stage membrane separator 8 is connected with the compressor 2 and then connected with the inlet of the second-stage first-stage membrane separator 7; and the non-permeate gas outlet of the second-stage membrane separator 8 is connected with the inlet of the third-stage membrane separator 5.
Taking the embodiment 2 as an example, the working principle is as follows: the content of helium in natural gas is very low, the helium is preliminarily concentrated by a primary membrane separator, enters a catalytic dehydrogenation unit to remove hydrogen in the helium, and then enters a decarburization unit to remove carbon dioxide in the hydrogen; the tail gas of the decarburization device is compressed and pressurized and then returns to a pipe network; the natural gas without impurities enters a third-stage membrane separator for further concentration, then enters a compressor for pressurization and enters a second-stage first-stage membrane separator for concentration to a higher concentration; the helium content in the non-permeation gas of the three-stage membrane separator is extremely low, and the gas returns to a pipe network after being pressurized by a compressor; the helium concentration of the permeation gas outlet of the second-stage first-stage membrane separator is higher, and pure helium is produced after the helium is pressurized by a crude helium compressor and enters a fine dehydrogenation system and a pressure swing adsorption unit; the non-permeation gas outlet of the second-stage first-stage membrane separator still contains a large amount of helium, and the helium enters the second-stage membrane separator to be recovered and returns to the crude helium compressor for circulation; the helium content in the non-permeation outlet of the second-stage membrane separator is still far higher than that of the original natural gas, and the helium returns to the third-stage membrane separator for recycling; the helium content in the desorption gas of the pressure swing adsorption unit is very high but the pressure is lower, the desorption gas returns to the outlet of the first-stage membrane separator for circulation, and the product gas of the pressure swing adsorption unit is purified high-purity helium.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the concept of the present invention within the technical scope of the present invention.
Claims (7)
1. A normal temperature natural gas helium extraction and purification system is characterized by comprising a primary membrane separator (1), a secondary first-stage membrane separator (7), a secondary second-stage membrane separator (8) and a pressure swing adsorption unit (6);
the permeation gas outlet of the first-stage membrane separator (1) is connected with the compressor (2) and then is connected with the inlet of the second-stage first-stage membrane separator (7); the non-permeable gas outlet of the primary membrane separator (1) is connected with a pipe network to continuously convey natural gas outwards;
the permeation gas outlet of the second-stage first-stage membrane separator (7) is connected with the compressor (2) and then connected with the pressure swing adsorption unit (6) to obtain high-purity helium;
the non-permeate gas outlet of the second-stage first-stage membrane separator (7) is connected with the inlet of the second-stage membrane separator (8);
the permeation gas outlet of the second-stage membrane separator (8) is connected with the compressor (2) and then connected with the second-stage first-stage membrane separator (7); and a non-permeable gas outlet of the second-stage two-section membrane separator (8) is connected to a pipe network to continuously convey natural gas outwards.
2. The extraction and purification system for helium from natural gas at normal temperature as claimed in claim 1, wherein the permeation gas outlet of the primary membrane separator (1) is connected with the compressor (2), then connected with the dehydrogenation unit (3) and the decarburization unit (4) for rough treatment, and then connected with the inlet of the secondary primary membrane separator (7).
3. The normal-temperature natural gas and helium extraction and purification system as claimed in claim 2, wherein a permeation gas outlet of the second-stage first-stage membrane separator (7) is connected with the compressor (2), then connected with the dehydrogenation unit (3) for fine treatment, and then connected with the pressure swing adsorption unit (6).
4. The normal-temperature natural gas helium extraction and purification system as claimed in claim 1, wherein a permeate gas outlet of the primary membrane separator (1) is connected with a compressor (2) and then is connected with an inlet of a tertiary membrane separator (5), and a permeate gas outlet of the tertiary membrane separator (5) is connected with an inlet of a secondary primary membrane separator (7) after being connected with the compressor (2); and a non-permeable gas outlet of the three-stage membrane separator (5) is connected with the compressor (2) and then is connected into a pipe network to continuously convey natural gas outwards.
5. An ambient temperature natural gas helium extraction and purification system as claimed in claim 2, wherein the desorbed gas outlet of the decarbonization unit (4) is connected to a pipeline network to continue to convey natural gas outwards.
6. A normal temperature natural gas helium extraction and purification system as claimed in claim 4, wherein the non-permeation gas outlet of the secondary two-stage membrane separator (8) is connected with the inlet of the tertiary membrane separator (5).
7. A normal temperature natural gas helium extraction and purification system as claimed in claim 1, wherein the desorbed gas outlet of the pressure swing adsorption unit (6) is connected with the outlet of the primary membrane separator (1) for circulation.
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| CN202022751400.XU CN214087729U (en) | 2020-11-25 | 2020-11-25 | Normal temperature natural gas helium extraction and purification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112408342A (en) * | 2020-11-25 | 2021-02-26 | 天邦膜技术国家工程研究中心有限责任公司 | Normal temperature natural gas helium extraction and purification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112408342A (en) * | 2020-11-25 | 2021-02-26 | 天邦膜技术国家工程研究中心有限责任公司 | Normal temperature natural gas helium extraction and purification system |
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