| 摘要 |
PURPOSE:To improve the yield of highly concentrated O2 by using a pressure swing system applying the adsorptivity of molecular sieves to remove Ar in O2 separated from air. CONSTITUTION:The air compressed by a compressor 1 is dehumidified by a device 2, and sent to an ordinary-temp. adsorption tower 4 through a pressure accumulator 3. The air is again dehumidified in the tower 4, CO2 and a part of N2 are simultaneously removed, and the air is sent to a low-concn. O2 pressure accumulator 5. The gas leaving the accumulator is cooled by a heat exchanger 7 and a cooler 8, and sent to a low-temp. adsorption tower 10. Since gaseous Ar is initially separated from the tower top, a valve V6 is opened, and the Ar is discharged to the atmosphere through a pressure accumulator 11. When O2 tends to separate thereafter, the valve V6 is closed, a valve V7 is opened, and the separated O2 is collected as a product through a high-concn. O2 pressure accumulator 12. Before N2 then tends to separate, the valve V7 is closed, a valve V8 is opened, and an E tower to be subsequently used is flushed with high-concn. O2. The valve V8 is then closed, a valve V9 is opened, and the desorbed gas is sent to a low-concn. O2 bypass tank 13. The low-concn. O2 increases the O2 concn. in the raw air, and enhances the yield of the product O2.
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