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A kind of natural gas liquefaction and helium recovery method

A technology for recovering helium and natural gas, applied in the field of natural gas processing technology, can solve the problems of low recovery rate of helium, low purity of crude helium products, high energy consumption, etc. tuning effect

Active Publication Date: 2022-07-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of high energy consumption, low recovery rate of helium and low purity of crude helium products existing in existing natural gas helium recovery methods, the present invention provides a method for natural gas helium recovery and natural gas liquefaction co-production, and develops a natural gas Helium extraction and natural gas liquefaction process, which is suitable for helium-containing natural gas helium recovery and natural gas liquefaction systems with different helium content, especially suitable for helium recovery and natural gas liquefaction systems with low helium content in natural gas

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  • A kind of natural gas liquefaction and helium recovery method
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example 1

[0028] Example 1: Liquefaction of natural gas with high nitrogen content and recovery of helium

[0029] The gas composition and working conditions of the pretreated raw gas:

[0030] Raw gas processing scale: 30×10 4 m 3 / d

[0031] Raw gas pressure: 5MPa

[0032] Raw gas temperature: 40℃

[0033] The composition of the feed gas is shown in Table 1.

[0034] Table 1. Composition of feed gas

[0035] natural gas components H 2

He N 2

C 1

C 2

C 3

iC 4

nC 4

nC 5

C 6

Natural gas composition, mol% 0.0011 0.35000 9.0000 90.3498 0.2298 0.0199 0.0443 0.004 0.0008 0.0003

[0036] Natural gas liquefaction provided by the invention and helium recovery embodiment 1 process flow is as follows figure 1 The process is briefly described as follows:

[0037] (1) After pretreatment (decarbonization and dehydration, etc.), the feed gas enters the precooler (E-101) and the main cold box (E-102) to cool down to -85.8...

example 2

[0048] Example 2: Example of natural gas liquefaction and helium recovery with low nitrogen content

[0049] The gas composition and working conditions of the pretreated raw gas:

[0050] Raw gas processing scale: 30×10 4 m 3 / d

[0051] Raw gas pressure: 4.5MPa

[0052] Raw gas temperature: 40℃

[0053] The feed gas composition is shown in Table 4.

[0054] Table 4 Composition of feed gas

[0055] natural gas components H 2

He N 2

C 1

C 2

C 3

iC 4

nC 4

nC 5

C 6

Natural gas composition, mol% 0.0011 0.3000 2.0000 97.3998 0.2298 0.0199 0.0443 0.004 0.0008 0.0003

[0056] Natural gas liquefaction provided by the invention and helium recovery method embodiment 2 process flow such as figure 2 The process is briefly described as follows:

[0057] (1) After pretreatment (decarbonization and dehydration, etc.), the feed gas enters the precooler (E-101) and the main cold box (E-102) to cool down to -84.3°...

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Abstract

The invention discloses a natural gas liquefaction and helium recovery method, which integrates natural gas liquefaction and helium recovery, and proposes a natural gas liquefaction and helium recovery method. The method separates a helium recovery tower and a denitrification tower bottom part. The material is integrated into the main cold box and the helium recovery cold box to provide cold sources for the two towers, eliminating the denitrification tower and the helium recovery tower reboiler, simplifying the process and improving the thermal integration of the system. After the feed gas is cooled, it enters the heavy hydrocarbon separator, and the gas phase of the heavy hydrocarbon separator enters the main cold box to cool down and then enters the flash tank, concentrates the feed to the helium recovery tower, and the flash tank gas phase is pressurized and then cooled and then enters the helium recovery tower for helium recovery. , the liquid phase of the flash tank enters the denitrification tower for denitrification. The gas phase at the top of the denitrification tower enters the compression system after heat exchange, and part of the pressurized high-purity nitrogen is used as a refrigerant, and the other part can be used for industrial purposes. The invention has the characteristics of high system heat integration, low energy consumption, small investment, and high natural gas liquefaction rate and helium recovery rate.

Description

technical field [0001] The invention relates to the technical field of natural gas processing technology, in particular to a natural gas liquefaction and helium recovery method. Background technique [0002] Helium is mainly used in low-temperature superconductivity, aerospace, semiconductors, optical fibers and other technical fields. my country's helium resources are scarce and the demand for imports is large. Natural gas containing helium is the main source of helium for industrial production. Building a natural gas helium recovery project will help alleviate my country's helium inlet pressure, the natural gas liquefaction and helium recovery methods proposed in this paper have a positive technical support for the construction of natural gas helium extraction projects. [0003] In the patent CN109734064 "A Helium Production System and Production Method", Xu Peng et al. proposed a method for extracting helium from BOG. ​​The system does not integrate natural gas liquefactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02F25J1/00
CPCF25J3/029F25J1/0082F25J3/0233F25J3/0238F25J3/0257F25J3/0209F25J2205/04F25J2230/08F25J2200/04F25J2200/76F25J2200/74F25J2215/04F25J2290/34F25J2270/42F25J2270/66F25J2270/02F25J2270/18F25J2270/12F25J2220/62
Inventor 蒋洪李浩玉
Owner SOUTHWEST PETROLEUM UNIV