Method and apparatus for cooling a hydrocarbon stream

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 1/02 (2006.01) F25B 9/00 (2006.01)

Patent

CA 2676177

Method of cooling a hydrocarbon stream (10) such as natural gas, the method at least comprising the steps of (a) heat exchanging the hydrocarbon stream (10) against a first refrigerant stream (20) to provide a cooled hydrocarbon stream (30) and an at least partly evaporated refrigerant stream (40); (b) compressing the at least partly evaporated refrigerant stream (40) using one or more compressors (14, 16, 18) to provide a compressed refrigerant stream (50, 60, 70); (c) cooling the compressed refrigerant stream (50, 60, 70) after one or more of the compressors against ambient to provide a cooled compressed refrigerant stream (70a); (d) dynamically expanding the cooled compressed gaseous refrigerant stream (70a) to provide an expanded refrigerant stream (80); and (e) further cooling the expanded refrigerant stream (80) to provide an at least partially condensed refrigerant stream.

L'invention porte sur un procédé de refroidissement d'un flux d'hydrocarbure (10) tel que du gaz naturel comprenant les étapes suivantes: (a) échange de chaleur entre le flux d'hydrocarbure (10) et un flux de réfrigérant (20) pour obtenir un flux d'hydrocarbure refroidi (30) et un flux de réfrigérant au moins en partie évaporé (40); (b) compression du flux de réfrigérant au moins en partie évaporé (40) à l'aide d'un ou de plusieurs compresseurs (14, 16, 18) pour obtenir un flux de réfrigérant comprimé (50, 60, 70); (c) refroidissement du flux de réfrigérant comprimé (50, 60, 70) après une ou plusieurs compressions pour obtenir un flux de réfrigérant comprimé refroidi (70a); (d) détente du flux de réfrigérant comprimé refroidi (70a) pour obtenir un flux de réfrigérant détendu (80); et (e) refroidissement du flux de réfrigérant détendu (80) pour obtenir un flux de réfrigérant au moins partiellement condensé.

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