METHOD OF COLD GENERATION IN CRYOGENIC COMPRESSOR-EXPANDER UNIT FOR AIR SEPARATION Russian patent published in 2013 - IPC F25J3/04 F25B11/00 

FIELD: machine building.

SUBSTANCE: method implies compression of atmospheric air to the pressure below the critical one, precooling of the compressed air, integrated treatment, separation of the compressed treated air into direct expander and process flows, cooling of direct compressed flows by the cold of reverse flows, adiabatic expansion of the direct expander air flow, liquefaction, throttling of the direct process air flow. At that the temperature and the pressure of the direct expander air flow before and after the adiabatic expansion is monitored, the said expansion is ended in the wet vapour region under the moisture content of not more than 20% and under the pressure close to the atmospheric one, liquid phase is separated from the wet-vapour expander air flow and is vapourised, at the same time the liquefied direct process air flow is cooled down to the subcooled liquid state, the latter flow is directed for throttling and separation into the productional liquid nitrogen and oxygen. The obtained productional liquid nitrogen and oxygen are sent for isothermal storage, liquid oxygen is compressed and gasified and the heat of its vapourisation cools one of the previously formed direct flows of compressed treated air.

EFFECT: improvement of economy efficiency and specific refrigerating power of a compressor-expander cryogenic unit.

2 dwg