Carbon dioxide reliquefaction system and carbon dioxide reliquefaction method which use closed cycle

Abstract

A carbon dioxide evaporation gas reliquefaction system comprises: an engine using a liquefied gas as fuel; a storage tank storing liquefied carbon dioxide; an evaporation gas compressor compressing carbon dioxide evaporation gas evaporated in the storage tank, so as to generate a compressed evaporation gas; a first evaporation gas heat exchanger cooling the compressed evaporation gas; and a refrigeration cycle in which a refrigerant circulates in order to provide cold energy to the first evaporation gas heat exchanger. The refrigeration cycle includes a refrigerant compressor compressing the refrigerant heated by heat exchange in the first evaporation gas heat exchanger, a refrigerant control valve expanding the compressed refrigerant and supplying the same to the first evaporation gas heat exchanger, and a second evaporation gas heat exchanger exchanging heat with the carbon dioxide evaporation gas evaporated in the storage tank to cool the refrigerant that passed through the refrigerant control valve.

Dependencies are inferred from the claim text.