METHOD FOR LIQUEFACTING NATURAL GAS AND RECOVERING LIQUID EVENTS OF NATURAL GAS COMPRISING A SEMI-OPENING REFRIGERANT CYCLE WITH NATURAL GAS AND TWO REFRIGERANT GAS REFRIGERANT CYCLES

摘要

The invention relates to a process for liquefying a natural gas comprising a mixture of hydrocarbons, mainly methane, the process comprising a natural gas semi-open refrigerant cycle in which the natural gas liquids are condensed and separated from the gas. natural gas feed stream, the latter passing through a main cryogenic heat exchanger (4) to contribute by heat exchange to the pre-cooling of a main stream of natural gas (FP) and cooling of an initial flow of gas refrigerant (G-0), a first refrigerant cycle closed with refrigerant gas and a second refrigerant cycle closed with refrigerant gas to ensure the additional pre-cooling of refrigerant gas and natural gas, the liquefaction of the main stream of natural gas , and the subcooling of liquefied natural gas. The invention also relates to a liquefaction plant for natural gas for the implementation of such a method.