NATURAL GAS LIQUEFACTION PLANT Russian patent published in 1999 - IPC

FIELD: natural gas liquefaction plants. SUBSTANCE: plant includes liquefaction line connected to precompressed natural gas pipe line. Plant includes also two cooling loops, one of which is closed. Nitrogen is used in this loop as cooling agent; loop includes compressor and expansion unit, as well as at least one heat exchanger mounted in liquefaction line. Second loop is open; it is connected to precompressed natural gas pipe line and is provided with expansion unit fitted on one shaft with compressor and expansion unit of closed loop and at least one heat exchanger located before expansion unit of closed loop. All heat exchangers are of shell-and-tube type. Tubular space of heat exchanges is included in closed loop. Liquefaction line includes adsorbers connected to closed loop for regeneration of adsorbent. EFFECT: enhanced expansion proofness; reduced power requirements; reduced number of driving mechanisms. 3 cl, 1 dwg