CN218842082U - Device for extracting helium from liquefied natural gas - Google Patents
Device for extracting helium from liquefied natural gas Download PDFInfo
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- CN218842082U CN218842082U CN202222502913.6U CN202222502913U CN218842082U CN 218842082 U CN218842082 U CN 218842082U CN 202222502913 U CN202222502913 U CN 202222502913U CN 218842082 U CN218842082 U CN 218842082U
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Abstract
The utility model discloses a device of liquefied natural gas extraction helium has solved among the prior art mode that natural gas extracted helium is usually that the BOG that comes out from the LNG storage tank flash distillation is gaseous as the feed gas, and gets its technology of gas and device complexity higher from the LNG storage tank to draw the technical problem that the energy consumption is high and economic benefits is poor. The device comprises a regulating valve (1), a raw material gas extraction unit (2), a crude helium extraction unit (3), a dehydrogenation and dehydration unit (4) and a low-temperature condensation adsorption unit (5). The utility model provides a device of liquefied natural gas extraction helium utilizes the liquefied natural gas separation to carry helium, can avoid getting gas from the LNG storage tank, has overcome technology and device complexity height, has drawed the problem that the energy consumption is high and economic benefits is poor.
Description
Technical Field
The utility model relates to a cryrogenic low temperature technical field, concretely relates to liquefied natural gas draws device of helium.
Background
Helium is a gas with the lowest known boiling point, is widely applied to the manufacturing fields of high-end equipment such as aerospace, large scientific engineering, medical nuclear magnetic resonance, semiconductors, optical fibers and the like, is a strategic resource related to national defense safety, and is listed as a key strategic material list in countries and regions such as the United states, european Union, russia and the like, and legal rules related to helium are made. Under the background of profound and significant changes in world constellations and geopolitics, helium has important strategic significance in promoting the scientific and technological progress of the country and guaranteeing the national defense safety. However, helium is a scarce non-renewable resource, mainly exists in natural gas, the total amount of global helium resources is about 519 cubic meters, the amount of national helium resources is only 11 cubic meters, 95% of domestic helium depends on import, and the natural gas belongs to the 'neckerchief' which needs to be solved urgently.
The way of extracting helium from natural gas is generally to use BOG gas flashed from an LNG storage tank as a raw material gas, but the LNG storage tank has a large volume and a large amount of flash gas per unit time, which results in high extraction energy consumption.
The applicant has found that the prior art has at least the following technical problems:
1. in the prior art, the method for extracting helium from natural gas usually adopts BOG gas flashed from an LNG storage tank as raw material gas, and the process and device for extracting gas from an LNG storage tank are high in complexity, high in extraction energy consumption, poor in economic benefit, large in project construction period investment, large in occupied area, large in outsourcing liquid nitrogen consumption, and high in operation cost.
2. In the prior art, the method for extracting helium from natural gas has the defects of high flash gas volume, high project investment caused by large handling capacity of a matched compressor and long return period of a project.
3. In the prior art, the natural gas extraction helium usually cannot generate cold source liquid nitrogen, so that the later operation cost is high, and the workload of operators of the device is large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a liquefied natural gas draws device of helium to the mode that solves among the prior art natural gas and draw the helium is usually that the BOG who comes out from the LNG storage tank flash distillation is gaseous as the feed gas, and gets its technology of gas and device complexity higher from the LNG storage tank, and draws the technical problem that the energy consumption is high and economic benefits is poor.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a device for extracting helium from liquefied natural gas, which comprises a regulating valve, a feed gas extraction unit, a crude helium extraction unit, a dehydrogenation and dehydration unit and a low-temperature condensation adsorption unit; wherein, the first and the second end of the pipe are connected with each other,
the inlet of the regulating valve is connected with the first liquefied natural gas pipeline, the outlet of the regulating valve is connected with the second liquefied natural gas pipeline, and the second liquefied natural gas pipeline is connected with the inlet of the raw material gas extraction unit;
an outlet of the raw gas extraction unit is connected with a helium-containing raw gas pipeline, an outlet of the raw gas extraction unit is connected with an LNG pipeline, a helium-containing raw gas pipeline is connected with an inlet of a crude helium extraction unit, an outlet of the crude helium extraction unit is connected with a methane gas pipeline, an outlet of the crude helium extraction unit is connected with a first crude helium pipeline, and a liquid nitrogen pipeline at an outlet of the crude helium extraction unit is connected with an inlet of a low-temperature condensation adsorption unit;
the outlet of the crude helium extraction unit is connected with a nitrogen pipeline, the first crude helium pipeline is converged with a recovered gas pipeline and then is connected with the inlet of a dehydrogenation and dehydration unit, the oxygen-containing gas pipeline is connected with the inlet of the dehydrogenation and dehydration unit, the outlet of the dehydrogenation and dehydration unit is connected with the outlet of the second crude helium pipeline, the second crude helium pipeline is connected with the inlet of a low-temperature condensation adsorption unit, the outlet of the low-temperature condensation adsorption unit is connected with the recovered gas pipeline, and the outlet of the low-temperature condensation adsorption unit is connected with a pure helium pipeline.
Further, the feed gas extraction unit is a rectifying tower, a stripping tower or a washing tower.
Further, the crude helium extraction unit is shown as a cryogenic rectification, cryogenic condensation or membrane separation system.
Further, the dehydrogenation and dehydration unit is a precious metal catalyst dehydrogenation device, a molecular sieve or an active carbon dehydration device.
Further, the low-temperature condensation adsorption unit is a wound tube heat exchanger, a shell-and-tube heat exchanger or a plate-fin heat exchanger.
Based on the technical scheme, the embodiment of the utility model provides a can produce following technological effect at least:
the utility model provides a device of liquefied natural gas extraction helium utilizes the liquefied natural gas separation to carry helium, can avoid getting gas from the LNG storage tank, has overcome technology and device complexity height, has drawed the problem that the energy consumption is high and economic benefits is poor. In particular, the following advantages are achieved:
(1) the utility model discloses a relative prior art of whole process flow, it is more simple and convenient, the energy consumption reduces by a wide margin, and the principle is popular and easy to understand, is suitable for the system of enterprise's technical staff to this device to master. The consumption and consumption of parts and equipment are comprehensively reduced, and the overall reduction of the production cost is realized. The utility model discloses a device of liquefied natural gas stripping helium.
(2) Whole process flow simple, only need increase 1 bypass pipeline in the product LNG export of liquefaction unit, introduce the feed gas extraction unit that carries the helium device, set up a LNG return line to the product LNG export pipeline of liquefaction unit from the feed gas extraction unit that carries the helium device again, can realize recycling of helium resource, can reduce the investment like this, easy to operate again.
(3) Whole process flow, can change nitrogen gas into liquid nitrogen in the liquefied natural gas, satisfy the self-production self-feeding of device cold source.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
in the drawings, the names of the parts corresponding to the reference numerals are as follows:
1. adjusting a valve; 2. a feed gas extraction unit; 3. a crude helium extraction unit; 4. a dehydrogenation dehydration unit; 5. a low temperature condensation adsorption unit; 6. a liquefied natural gas pipeline I; 7. a liquefied natural gas pipeline II; 8. an LNG line; 9. a helium-containing feed gas line; 10. a first crude helium pipeline; 11. a gas recovery line; 12. a methane gas line; 13. a second crude helium pipeline; 14. a pure helium line; 15. a liquid nitrogen line; 16. an oxygen-containing gas line; 17. a nitrogen gas pipeline.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
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 work belong to the protection scope of the present invention. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
Example 1:
a device for extracting helium from liquefied natural gas comprises a regulating valve 1, a raw gas extraction unit 2, a crude helium extraction unit 3, a dehydrogenation and dehydration unit 4 and a low-temperature condensation and adsorption unit 5; wherein the content of the first and second substances,
the inlet of the regulating valve 1 is connected with a liquefied natural gas pipeline I6, the outlet of the regulating valve 1 is connected with a liquefied natural gas pipeline II 7, and the liquefied natural gas pipeline II 7 is connected with the inlet of the raw material gas extraction unit 2;
an outlet of the raw gas extraction unit 2 is connected with a helium-containing raw gas pipeline 9, an outlet of the raw gas extraction unit 2 is connected with an LNG pipeline 8, the helium-containing raw gas pipeline 9 is connected with an inlet of the crude helium extraction unit 3, an outlet of the crude helium extraction unit 3 is connected with a methane gas pipeline 12, an outlet of the crude helium extraction unit 3 is connected with a crude helium pipeline I10, and a liquid nitrogen pipeline 15 at an outlet of the crude helium extraction unit 3 is connected with an inlet of the low-temperature condensation adsorption unit 5;
the outlet of the crude helium extraction unit 3 is connected with a nitrogen pipeline 17, the first crude helium pipeline 10 is converged with a recycle gas pipeline 11 and then connected with the inlet of the dehydrogenation and dehydration unit 4, the oxygen-containing gas pipeline 16 is connected with the inlet of the dehydrogenation and dehydration unit 4, the outlet of the dehydrogenation and dehydration unit 4 is connected with the outlet of the second crude helium pipeline 13, the second crude helium pipeline 13 is connected with the inlet of the low-temperature condensation and adsorption unit 5, the outlet of the low-temperature condensation and adsorption unit 5 is connected with the recycle gas pipeline 11, and the outlet of the low-temperature condensation and adsorption unit 5 is connected with the pure helium pipeline 14.
As an alternative embodiment, the feed gas extraction unit 2 is a rectification column, a stripping column or a washing column.
As an alternative embodiment, the crude helium extraction unit 3 is shown as a cryogenic rectification, cryogenic condensation or membrane separation system.
As an alternative embodiment, the dehydrogenation and dehydration unit 4 is a precious metal catalyst dehydrogenation device, a molecular sieve or an activated carbon dehydration device.
As an alternative embodiment, the low-temperature condensation adsorption unit 5 is a wound-tube heat exchanger, a shell-and-tube heat exchanger or a plate-fin heat exchanger.
Example 2:
the utility model provides a pair of method for liquefied natural gas extraction helium, the device of liquefied natural gas extraction helium among the application embodiment 1 carries out liquefied natural gas and draws helium, specifically includes following step:
s1, a helium-containing liquefied natural gas pipeline 6 enters a helium-containing feed gas extraction unit 2 through an adjusting valve 1, LNG with the temperature of-160 ℃ and the pressure of 0.05MPa.G is separated from the feed gas extraction unit 2, and helium-containing feed gas pipeline 9 separated by the feed gas extraction unit 2 enters a crude helium extraction unit 3 with the temperature of-160 ℃ and the pressure of 0.05MPa.G;
s2, the methane gas 12 separated from the crude helium extracting unit 3 is at the temperature of 35 ℃ and the pressure of 0.1MPa.G, the nitrogen gas separated from the crude helium extracting unit 3 is at the temperature of 35 ℃ and the pressure of 0.3MPa.G, the liquid nitrogen separated from the crude helium extracting unit 3 is at the temperature of-178 ℃ and the pressure of 0.4MPa.G, the crude helium gas line I10 separated from the crude helium extracting unit 3 is at the temperature of 35 ℃ and the pressure of 2.0MPa.G, the crude helium gas is mixed with the recovery gas and then enters the dehydrogenation and dehydration unit 4, the oxygen-containing gas at the temperature of 35 ℃ and the pressure of 2.0MPa.G enters the dehydrogenation and dehydration unit 4, the crude helium gas separated from the dehydrogenation and dehydration unit 4 is at the temperature of 10 ℃ and the pressure of 2.0MPa.G, and the pure helium gas prepared from the crude helium gas through the low-temperature condensation and adsorption unit 5 is at the temperature of 25 ℃ and the pressure of 15MPa.G. The liquid nitrogen enters the low-temperature condensation adsorption unit 5 to be used as a cold source for cooling.
S3, realizing that the purity of the refined helium is more than or equal to 99.995 percent and the total power consumption for extracting the helium is less than or equal to 11.5KW.h/Nm by theoretical design indexes 3 (fine helium, BOG-containing boosting power consumption), helium extraction rate more than or equal to 95% and other indexes, and the technical indexes are at advanced level in China.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the above disclosure.
The foregoing shows and describes the basic principles and principal features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The device for extracting helium from liquefied natural gas is characterized by comprising a regulating valve (1), a raw gas extraction unit (2), a crude helium extraction unit (3), a dehydrogenation and dehydration unit (4) and a low-temperature condensation adsorption unit (5); wherein the content of the first and second substances,
the inlet of the regulating valve (1) is connected with a first liquefied natural gas pipeline (6), the outlet of the regulating valve (1) is connected with a second liquefied natural gas pipeline (7), and the second liquefied natural gas pipeline (7) is connected with the inlet of the raw material gas extraction unit (2);
an outlet of the raw gas extraction unit (2) is connected with a helium-containing raw gas pipeline (9), an outlet of the raw gas extraction unit (2) is connected with an LNG pipeline (8), the helium-containing raw gas pipeline (9) is connected with an inlet of the crude helium extraction unit (3), an outlet of the crude helium extraction unit (3) is connected with a methane pipeline (12), an outlet of the crude helium extraction unit (3) is connected with a crude helium pipeline I (10), and a liquid nitrogen pipeline (15) at an outlet of the crude helium extraction unit (3) is connected with an inlet of the low-temperature condensation adsorption unit (5);
the outlet of the crude helium extraction unit (3) is connected with a nitrogen pipeline (17), the first crude helium pipeline (10) and the recovered gas pipeline (11) are converged and then are connected with the inlet of the dehydrogenation-dehydration unit (4), the oxygen-containing gas pipeline (16) is connected with the inlet of the dehydrogenation-dehydration unit (4), the outlet of the dehydrogenation-dehydration unit (4) is connected with the outlet of the second crude helium pipeline (13), the second crude helium pipeline (13) is connected with the inlet of the low-temperature condensation adsorption unit (5), the outlet of the low-temperature condensation adsorption unit (5) is connected with the recovered gas pipeline (11), and the outlet of the low-temperature condensation adsorption unit (5) is connected with the pure helium pipeline (14).
2. Plant for extracting helium from liquefied natural gas according to claim 1, characterized in that the feed gas extraction unit (2) is a rectification column, a stripping column or a washing column.
3. Plant for extracting helium from liquefied natural gas according to claim 1, wherein the crude helium extraction unit (3) is a cryogenic rectification, a cryogenic condensation or a membrane separation system.
4. The apparatus for extracting helium from liquefied natural gas as claimed in claim 1, wherein the dehydrogenation and dehydration unit (4) is a noble metal catalyst dehydrogenation unit, a molecular sieve or an activated carbon dehydration unit.
5. The apparatus for extracting helium from liquefied natural gas as claimed in claim 1, wherein the cryocondensation adsorption unit (5) is a coiled tube heat exchanger, a shell and tube heat exchanger or a plate fin heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222502913.6U CN218842082U (en) | 2022-09-21 | 2022-09-21 | Device for extracting helium from liquefied natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222502913.6U CN218842082U (en) | 2022-09-21 | 2022-09-21 | Device for extracting helium from liquefied natural gas |
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| Publication Number | Publication Date |
|---|---|
| CN218842082U true CN218842082U (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222502913.6U Active CN218842082U (en) | 2022-09-21 | 2022-09-21 | Device for extracting helium from liquefied natural gas |
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| Country | Link |
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| CN (1) | CN218842082U (en) |
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- 2022-09-21 CN CN202222502913.6U patent/CN218842082U/en active Active
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