METHOD FOR CRYOGENIC SEPARATION OF AIR, AND AIR SEPARATION PLANT
European Patent Office Patent
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Abstract
The invention relates to a method for cryogenic separation of air, in which an air separation plant (100-300) having a rectification column arrangement (10) which comprises a pressure column (11), a low-pressure column (12) and a raw argon column (13) is used. In the method, evaporation gas from a head gas condensation device (13.10) associated with the raw argon column (13) is partly or completely fed into the low-pressure column (12) via a gas line (13G). The gas line (13G) contains a first throttle valve (13V1) which is adjusted by means of a control device so that argon is prevented from freezing out in the first head gas condensation arrangement (13.10). This creates, at least temporarily, a pressure drop of at least 50 mbar across the throttle valve (13V1). The present invention also relates to a corresponding air separation plant (100-200).
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