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METHOD FOR LIQUEFYING NATURAL GAS AND FOR RECOVERING ANY LIQUID FROM THE NATURAL GAS COMPRISING TWO COOLANT CYCLES SEMI-OPEN TO THE NATURAL GAS AND A COOLANT CYCLE CLOSED TO THE COOLANT GAS
METHOD FOR LIQUEFYING NATURAL GAS AND FOR RECOVERING ANY LIQUID FROM THE NATURAL GAS COMPRISING TWO COOLANT CYCLES SEMI-OPEN TO THE NATURAL GAS AND A COOLANT CYCLE CLOSED TO THE COOLANT GAS
The invention relates to a natural gas liquefaction method, which comprises a hydrocarbon mixture, most of which is methane, It includes the process of the first semi open natural gas refrigerant cycle, in which the possible liquid in the condensed natural gas is separated from the natural gas supply stream, Then, through the main low temperature heat exchanger (4), the latter promotes the precooling of the main natural gas flow (F-P) and the cooling of the initial refrigerant gas flow (G-0) through heat exchange,The second semi open natural gas refrigerant cycle is used for the pre cooling of natural gas and refrigerant gas and the liquefaction of natural gas, And a refrigerant cycle closed to the refrigerant gas to ensure the supercooling of LNG and provide supplementary refrigeration power for the other two cycles. The invention also relates to a natural gas liquefaction device for implementing the process.
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