Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1997-11-20
2000-05-16
Capossela, Ronald
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62619, F25J 100
Patent
active
060620412
ABSTRACT:
Provided is a method for liquefying natural gas which can be applied to LNG plants of a wide range of capacity and can produce LNG both efficiently and economically. Feed gas of natural gas or a non-liquefied component of recycle gas which is produced during a process of liquefying natural gas is liquefied by using a first refrigerant, for instant consisting of a C3 refrigerant, and a second refrigerant which is different from the first refrigerant, for instance consisting of a C2 refrigerant, in a stepwise fashion. The flow is then liquefied by a substantially isentropic expansion process. The non-liquefied component remaining from this expansion process is then pressurized by a compressor, and combined with the non-liquefied component of the natural gas for recycling the combined flow. The compressor is driven by power obtained from the substantially isentropic expansion process.
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Fukuda Yasuharu
Kikkawa Yoshitsugi
Nakamura Moritaka
Sugiyama Shigeru
Yamamoto Osamu
Capossela Ronald
Chiyoda Corporation
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