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Method for extracting helium from natural gas

A natural gas and steam technology, used in liquefaction, solidification, lighting and heating equipment, etc., can solve the problems of difficult cooling balance and unstable process operation, achieve stable process operation, increase product output value and comprehensive economic benefits, and increase energy. consumption effect

Active Publication Date: 2013-05-08
PETROCHINA CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for extracting helium from natural gas in view of the disadvantages of unstable process operation and difficult cooling capacity balance in the prior art

Method used

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  • Method for extracting helium from natural gas
  • Method for extracting helium from natural gas

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Embodiment Construction

[0028] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0029] A method for extracting helium from natural gas of the inventive method comprises the following steps:

[0030] Helium-containing raw natural gas 1 entering the helium extraction device through the pipeline Intake volume: 704.9 kmol per hour, temperature: 40 ° C, after deep CO removal 2 1. After the water purification treatment, pressurization treatment is carried out, and the pressure is 4Mpa. The raw natural gas exchanges heat with the main heat exchanger 16 to obtain a mixture 9, which enters the first-stage helium extraction separation tower 8 (one tower) through pipelines for low-temperature rectification, and its inlet pressure is 2.2-2.6 Mpa. Most of the liquid 4 obtained from the bottom 7 of the separation tower passes through the throttling valve as the backflow expansion liqu...

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Abstract

The invention discloses a method for extracting helium from natural gas. The method comprises the following steps: (A) the natural gas containing helium is conveyed into a main heat exchanger for cooling; (B) the mixture obtained by cooling in step (A) is conveyed, into a separating tower; after the mixture is heated, at least one part of the steam is cooled at the tower top by a condensation evaporator, primary coarse helium is obtained; and after purification of the primary coarse helium, a coarse helium product is obtained; (C) a part of liquid at the bottom of the separating tower enters the condensation evaporator at the tower top by a pipeline after pressure reduction and throttling, and carries out heat exchange with the steam in step (B) as a cold source of the condensation evaporator; and (D) according to the need of cold-amount balance, whether an LNG (Liquefied Natural Gas) product obtained after heat exchange between the cold source in step (C) and the steam in step (B) needs to be acquired from the condensation evaporator is determined. The invention has the advantages that the conception is ingenious, the process is simple, the operation of the process is stable, thecold amount is easy for balance, and the energy consumption and the cost are greatly reduced.

Description

technical field [0001] The invention relates to a method for extracting crude helium from helium-containing natural gas. Background technique [0002] At present, cryogenic separation is often used to extract helium from natural gas. The main principle is to obtain crude helium once purified natural gas is refrigerated and cryogenically rectified, and then further enriched to obtain crude helium with a concentration of 30-80%. [0003] For example, the patent No. CN200710002320.0 applied by the American Gas Products and Chemical Company, the invention title is the invention patent for the method and device for preparing products from natural gas including helium and liquefied natural gas, which involves the production of crude helium from natural gas , liquefied natural gas products, and optionally synthesis gas methods and apparatus. Natural gas containing helium and methane is cooled to produce cooled natural gas. At least a portion of the helium and methane are separate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02
Inventor 李均方刘泽军谭敬明华洪基李朝贵杨武英王应海许柯
Owner PETROCHINA CO LTD
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