A TREATMENT SYSTEM OF LIQUEFIED GAS

摘要

A liquefied gas treatment system according to an embodiment of the present invention comprises: an evaporated gas line connected to a liquefied gas storage tank; an evaporated gas compressor arranged in the evaporated gas line to pressurize evaporated gas generated in the liquefied gas storage tank; an evaporated gas heat exchanger arranged in the upstream of the evaporated gas compressor in the evaporated gas line to perform heat exchange of an evaporated gas collected to the evaporated gas line via the evaporated gas line and an evaporated gas supplied from the liquefied gas storage tank; an evaporated gas pressure reducer arranged in the downstream of the evaporated gas heat exchanger in the evaporated gas line to reduce the pressure of an evaporated gas heat exchanged in the evaporated gas pressure reducer; a gas-fluid separator arranged in the downstream of the evaporated gas pressure reducer in the evaporated gas line to separate a flash gas from an evaporated gas of which pressure is reduced in the evaporated gas pressure reducer; a gas collecting line connected from the gas-fluid separator to the upstream of the evaporated gas heat exchanger to supply a flash gas to the evaporated gas heat exchanger; and a nitrogen remover arranged in the gas collecting line to remove nitrogen in an evaporated gas supplied from the gas-fluid separator. A liquefied gas treatment system according to the present invention removes nitrogen from a flash gas supplied from the gas-fluid separator, supply the remaining gas to the evaporated gas compressor, and compresses the flash gas with reduced volume by removing nitrogen, thereby compression efficiency may be improved and operation costs of re-liquefying process can be reduced.