METHOD OF CREATING BREATHING ATMOSPHERE Russian patent published in 2013 - IPC F24F3/14 C01B13/02 

FIELD: process engineering.

SUBSTANCE: proposed method comprises forming external gas flow 1, compressing it in compressor 2, its stepwise separation in membrane modules 4, 10 by forcing ir along surfaces of selective membranes 3,8 in high-pressure areas of said modules 4, 10, forming feed gas flow and feeding it into working space. Membrane modules 4, 10 make two-step unit. Gas flow from said high-pressure areas is combined and fed into intermediate tank 6 and features nitrogen content of 92-99 vol. %. Gas flow from said low-pressure areas is combined and fed into intermediate tank 14 and features nitrogen content of 90-99 vol. %. Before feeding gas flow to unit first step, then from low-pressure areas from first step and to every next step as well as into intermediate tank 14 with oxygen content. Gas flow is subjected to pre-compression at 5.0-15.0 bar. Gas flow is discharged from low-pressure areas at absolute pressure of 0.3-1.0 bar by controlled feed of gas flow from intermediate tanks with nitrogen and oxygen content to form breathing atmosphere in working spaces.

EFFECT: simultaneous control over oxygen concentration in several working spaces.

6 cl, 1 dwg