METHOD AND DEVICE FOR INERT NITROGEN-BASED GAS MIXTURE OBTAINING Russian patent published in 2004 - IPC

FIELD: compressor-building engineering, particularly provision of explosion-proof operation during gas, gas-condensate and oil well repair and development. SUBSTANCE: method involves compressing atmospheric air free from mechanical admixtures into initial compressor stages up to pressure of 8 - 12 kg/sq.sm; cooling compressed air; removing water and oil drops from compressed air into cooler and water-and-oil trap; cleaning air from water and oil vapor into air fine filter; separating air in gas-separator into inert nitrogenbased gas mixture with oxygen content of 10% and oxygen enriched air; extracting oxygen from air into gas-separator and compressing oxygen up to pressure of 100 - 150 kg/sq.cm; removing admixtures from oxygen into water-and-oil trap; cooling oxygen up to temperature below 40 C into cooler; feeding inert gas mixture through multi-stage booster unit into vessel, wherein inert gas mixture feeding into vessel is performed by all booster unit cylinders during the initial period to increase vessel pressure up to the first step pressure; feeding inert gas mixture from the first step into the second compression step along with pumping gas mixture simultaneously by the second step and the third step cylinders to obtain vessel pressure equal to that of the second step; operating booster unit by successive cycle, namely the first-the second-the third steps pumping into vessel along with inert gas mixture cooling up to temperature 40 C into coolers and cleaning into water-and-oil traps or heating into heater (or vortex tube) up to temperature of 150 - 300 C and supplying to consumers under pressure of 25 - 250 kg/sq.sm. EFFECT: increased extraction factor of inert gas mixture, decreased oxygen content into inert gas mixture, increased use factor of compressed air components, extended range of obtained air components by temperature, pressure and efficiency. 7 cl, 1 dwg