COMBINED CYCLE OF GAS LIQUEFACTION, UTILISING MULTITUDE OF EXPANSION ENGINE Russian patent published in 2008 - IPC F25J1/02 

FIELD: refrigerating engineering.

SUBSTANCE: according to method of gas liquefaction initial gas is cooled by the first refrigeratory system in the first heat exchanging zone and essentially liquefied initial flow is drained from it; it is implemented further cooling of essentially liquefied initial flow in the second heat exchanging zone due to indirect heat exchange with one or several flows of refrigerating fluid extended while work execution. Indirect heat exchange is supplied by second refrigeratory system, cooled in greater degree essentially liquefied initial flow is drained from it. At least one flow from among one or several flows of refrigerating fluid extended while work is supplied by compression of one or several refrigerating fluid vapour to support flow of compressed refrigerating fluid. At that flow of compressed refrigerating fluid is cooled whole or its part in the third heat exchange zone to support flow of cooled compressed refrigerating fluid; and flows of cooled compressed refrigerating fluid is extended while work execution to support one flow from number of one or several flows of extended during working process refrigerating fluid. Consumption of extended while work execution refrigerating fluid flow in the second heat exchanging zone is less than aggregate consumption of one or several extended while work execution refrigerating fluid flow in the third heat exchanging zone; or additional cooling cycle is implemented for the third heat exchanging zone of the third refrigeratory system.

EFFECT: usage of invention allows to increase coefficient of efficiency and versatility of gas liquefaction processes.

29 cl, 8 dwg