FIELD: machine building.
SUBSTANCE: according to versions of procedure gas coming into liquefaction installation from main is divided to process and production flows. The process flow of gas is dewatered and after a preliminary heat exchanger enters an expansion device wherein pressure and temperature of gas are dropped. Further, gas is returned with a reverse flow into a distributing pipeline cooling the production flow of gas. The production flow of gas is preliminary dewatered and purified from high boiling components (including from CO2), and passes in a direct flow through heat exchangers, where it is cooled and partially liquefied after throttling. Temperature of production flow of gas before the expansion device is chosen under condition of the highest degree of gas liquefaction at absence of CO2 crystallisation upon gas expansion. At high content of CO2 in source gas the production flow of gas is additionally compressed before inlet into the installation.
EFFECT: improved procedure.
6 cl, 4 dwg
