SYSTEM AND METHOD FOR LIQUEFACTION OF NATURAL GAS

摘要

By using the power generated by an expander by an expansion of material gas, the outlet pressure of a compressor is increased, and a requirement on the cooling capacity of a cooler is reduced. The liquefaction system (1) for natural gas comprises a first expander (3) for generating power by using natural gas under pressure as material gas; a first cooling unit (11, 12) for cooling the material gas depressurized by expansion in the first expander; a distillation unit (15) for reducing or eliminating a heavy component in the material gas by distilling the material gas cooled by the first cooling unit; a first compressor (4) for compressing the material gas from which the heavy component was reduced or eliminated by the distillation unit by using power generated in the first expander; and a liquefaction unit (21) for liquefying the material gas compressed by the first compressor by exchanging heat with a refrigerant.

主权项

1. A system for the liquefaction of natural gas that cools the natural gas to produce liquefied natural gas, comprising:
a first expander for generating power by expanding natural gas under pressure as material gas; a first cooling unit for cooling the material gas depressurized by expansion in the first expander; a distillation unit for reducing or eliminating a heavy component in the material gas by distilling the material gas cooled by the first cooling unit; a first compressor for compressing the material gas from which the heavy component was reduced or eliminated by the distillation unit by using the power generated in the first expander; and a liquefaction unit for liquefying the material gas compressed by the first compressor by exchanging heat with a refrigerant.