| 摘要 |
PROBLEM TO BE SOLVED: To provide a source gas liquefying method where the liquefaction efficiency is improved. SOLUTION: Liquefaction is performed by cooling systems one of which provides cold less than about -40 deg.C, using one or more gasified refrigerant cycles, and the other of which provides cold less than about -100 deg.C, using a gas expander cycle. Each of these two types of cooling systems is used in an optimum temperature range which optimizes the efficiency of a specified system. The significant section (generally more than 5% and frequently more than 10% out of the whole) out of all cooling power required to liquefy the source gas can be consumed in the gasified refrigerant cycle. |
