A TREATMENT SYSTEM OF LIQUEFIED NATURAL GAS

摘要

The present invention relates to an LNG processing system. The LNG processing system comprises an LNG supply line which is connected to users from an LNG storage tank; a pump which is in the middle of the LNG supply line and pressurizes LNG discharged from the LNG storage tank; evaporative gas compressors which pressurize evaporative gas generated from the LNG storage tank in stages; an LNG heat exchanger which is placed in the LNG supply line between the pump and users and exchanges heat of the evaporative gas from the LNG storage tank with pressurized LNG; an evaporative gas heat exchanger which exchanges heat of the evaporative gas pressurized in the evaporative gas compressors with the evaporative gas generated from the LNG storage tank; and a Joule-Thomson valve which decompresses the heat exchanged evaporative gas with the LNG discharged from the LNG heat exchanger. The LNG supplied through the LNG supply line and decompressed evaporative gases are supplied to the pump. The LNG processing system supplies low pressure LNG to the users by compressing the evaporative gas generated from the LNG storage tank due to heat penetration in stages or the system supplies liquefied evaporative gas to the users with high pressure through the pump after compression in stages using the Joule-Thomson valve. The LNG processing system supplies the LNG to the users with high pressure by compressing the LNG in stages so that the system prevents the waste of the evaporative gas.