NATURAL GAS LIQUEFACTION SYSTEM AND METHOD OF PRODUCING A LIQUEFIED NATURAL GAS STREAM

摘要

A nitrogen stripper uses a shared distillation column that performs cryogenic distillation of multiple liquefied natural gas streams that are sourced from multiple cryogenic heat exchangers. The shared distillation column receives at least a part of an expanded liquefied natural gas stream, and discharges a liquefied natural gas stream through a bottom liquid outlet, and a reject vapour through an overhead vapour outlet. The expanded liquefied natural gas stream is obtained by expanding a plurality of pressurized liquefied natural gas streams discharged by the cryogenic heat exchangers. The distillation column is connected to a reboiler system, which has a separate heat exchange core for each one of the multiple liquefied natural gas streams that is dedicated to only one of these liquefied natural gas streams.