METHOD OF NATURAL GAS LIQUEFACTION BY THE CYCLE OF HIGH PRESSURE WITH THE PRECOOLING OF ETHANE AND NITROGEN 'ARCTIC CASCADE' AND THE INSTALLATION FOR ITS IMPLEMENTATION

摘要

FIELD: gas production industry.;SUBSTANCE: invention relates to a natural gas liquefaction method. Method for liquefying natural gas consists in pre-cooling the prepared natural gas, separating ethane, supercool the liquefied gas with the use of cooled nitrogen as a coolant, reduce the pressure of the liquefied gas, separate the non-liquefied gas and withdraw the liquefied natural gas. In this case, before the preliminary cooling, the natural gas is compressed, the ethane is separated off in the process of multi-stage pre-cooling of the liquefied gas with simultaneous evaporation of ethane using cooled ethane as a refrigerant. Ethane, obtained by evaporation, is compressed, condensed and used as a coolant upon cooling of the liquefied gas and nitrogen, with nitrogen being compressed, cooled, expanded and fed to a supercooling step of natural gas.;EFFECT: invention is aimed at simplifying of the technological process of liquefying natural gas.;10 cl, 1 dwg