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, throttle expansion with a subsequent condensation of part of air, thermostating of vessel with a partial decondensation of throttled air due to heat exchange with liquefied air in the coil-pipe, preheating of the remaining part of gaseous air with pressure rise in the heat exchanger, expansion in the turbine with generation of useful power, liquefaction in the condenser of the Stirling cryogenic machine, and feeding of liquid 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.