CRYOGENIC SYSTEM FOR AIR LIQUEFACTION Russian patent published in 2000 - IPC

FIELD: cryogenic equipment for air liquefaction. SUBSTANCE: air liquefaction cycle includes the following processes: compression of primary air in the compressor, air cleaning, precooling in the heat exchanger, separation of air into two flows, expansion of the first flow in an expansion machine with generation of useful power in the electric generator, throttle expansion of the second flow with subsequent partial condensation, joining of the non-condensed part of air of the second flow with the first flow, their preheating with pressure rise in the heat exchanger, expansion in the turbine with generation of useful power, liquefaction in the condenser of the cryogenic stirling machine and feeding of liquefied air through the Dewar flask to the vessel for liquid air by means of the high-pressure pump. Transition of gaseous air to the liquid phase in the evaporator of the refrigerating machine builds up the necessary pressure differential in the gaseous air line. EFFECT: enhanced system efficiency. 1 dwg