Apparatus for the liquefaction of natural gas and methods...

F - Mech Eng,Light,Heat,Weapons – 28 – D

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F28D 7/10 (2006.01) F25J 1/02 (2006.01) F28F 27/02 (2006.01)

Patent

CA 2607866

An apparatus and method for producing liquefied natural gas. A liquefaction plant may be coupled to a source of unpurified natural gas, such as a natural gas pipeline at a pressure letdown station. A portion of the gas is drawn off and split into a process stream (154) and a cooling stream (152). The cooling stream (152) passes through a turbo expander (156) creating work output. A compressor (158) is driven by the work output and compresses the process stream. The compressed process stream is cooled, such as by the expanded cooling stream. The cooled, compressed process stream is divided into first and second portions with the first portion being expanded to liquefy the natural gas. A gas-liquid separator separates the vapor from the liquid natural gas. The second portion of the cooled, compressed process stream is also expanded and used to cool the compressed process stream. Additional features and techniques may be integrated with the liquefaction process including a water clean-up cycle and a carbon dioxide (CO2) clean-up cycle.

Appareil et méthode pour produire du gaz naturel liquéfié. Une usine de liquéfaction peut être reliée à une source de gaz naturel non purifié, par exemple un pipeline de gaz naturel à une station de réduction de pression. Une partie du gaz est prélevée et acheminée dans deux circuits distincts : un circuit de transformation (154) et un circuit de refroidissement (152). Le circuit de refroidissement (152) passe dans un turbodétendeur (156), ce qui génère une quantité de travail qui active un compresseur (158), lequel compresse le flux du circuit de transformation. Ce flux comprimé est refroidi, comme par le circuit de refroidissement après détente. Le flux de traitement comprimé refroidi est divisé en deux parties, la première étant détendue afin de liquéfier le gaz. Un séparateur gaz-liquide sépare la vapeur du gaz naturel liquide. La seconde portion du flux de traitement refroidi comprimé est également détendue et utilisée pour refroidir le flux de traitement comprimé. D'autres caractéristiques et techniques peuvent être intégrées au procédé de liquéfaction, notamment un cycle de nettoyage à l'eau et un cycle de nettoyage au dioxyde de carbone (CO2).

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