FIELD: technological processes.
SUBSTANCE: method for cryogenic liquefaction/cooling and system for method realisation are suggested, which provide for the following: temperature of gas subject to liquefaction, at the inlet of compressor for gas compression, is lowered by cooling of gas exhausted from compressor, with application of highly efficient refrigerating machine and steam compression refrigerating machine prior to introduction of this gas into multi-cascade heat exchanger. Gas subject to liquefaction and compressed with compressor is cooled with the help of coolant and is additionally cooled with the help of adsorption refrigerating machine, in which waste heat is used, which is generated in compressor, and with the help of ammonia refrigerating machine, afterwards highly pressurised gas is supplied to multi-stage heat exchanger, where this gas is cooled with low temperature and low pressure gas extracted from mixture of liquid and gas produced due to adiabatic expansion of high pressure gas by means of expansion valve, and is returned to compressor, and part of high pressure gas is exposed to adiabatic expansion with the help of turbine expansion engines in the middle of high pressure gas flowing path via heat exchanger stages for combination with low pressure and low temperature gas returned to compressor.
EFFECT: application of invention will make it possible to reduce consumed power and increase refrigerating coefficient.
6 cl, 7 dwg
