| 摘要 |
The invention relates to a method for the low-temperature separation of air, according to which a partial stream or the entire air stream to be separated is cooled in at least one reversible regenerator pair by heat exchange with part of the separation products and impurities are condensated out. The air stream purified in this manner is then subjected to low-temperature separation. The invention also relates to a device for carrying out this method, comprising at least one reversible regenerator pair, in which the air inlet line is joined to the regenerators. According to the invention water is separated from the air stream fed through the regenerator pair in an adsorptive manner before the impurities are condensated out, and the heat exchange of the air stream fed through the regenerators is carried out exclusively in exchange for an impure nitrogen stream from the low-temperature separation. That partial stream of the air stream to be separated which is not fed to the regenerators is freed of impurities in an adsorptive manner and then cooled in an indirect heat exchange with at least one separation product to be pre-heated. Preferably at least 50 to 85 % of the air subjected to low-temperature separation is fed through the regenerators. |
