Air Separation Method And Plant

Abstract: In this air separation method, compressed air (6) is successively cooled in a cooling step (7), purified in a purifier (9) and sent to a cryogenic section (11) producing at least one product containing at least one air component. The purifier (9) comprises at least two switchable adsorber vessels, one of them being in adsorption mode. Two sources of compressed air are provided. The first source is an air grid (1) supplying compressed air to further consumers. The second source is a dedicated main air compressor (4) delivering compressed air to the cooling step (7) only. Air portions (2, 5) from both sources are mixed at a mixing point (3). The air flow (10) to the cryogenic section (11) is controlled by measuring (12, 12.1, 12.2) at least one parameter of the air flow upstream or downstream the purifier. According to such measurement, the air flow (5) at the outlet of the main air compressor (4) is set (14).

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