Method for obtaining one or more air products, and air fractionation plant
AssigneeLinde Aktiengesellschaft
InventorDaniel Palaniswamy Otte
Life of this patent
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Abstract
A method for obtaining one or more air products, in which method an air fractionation plant is used which has a column system with a pressure column wherein air is fed to the column system and is fractionated in the column system, wherein at least 90% of the total amount of air supplied to the column system is compressed wherein nitrogen-rich gas is extracted from the pressure column, and wherein, at least in a first operating mode, further air is compressed to a pressure level above the base pressure level, is expanded, and is warmed without fractionation in the column system. It is provided that, at least in the first operating mode, a proportion of the nitrogen-rich gas extracted from the pressure column is fed to the further air upstream of the expansion.
Claims15
A method for obtaining one or more air products, wherein an air fractionation plant is used which has a column system having a pressure column, wherein the pressure column is operated in a pressure range from 4 to 7 bar, wherein air is fed to the column system and fractionated in the column system, wherein at least 90% of the total air supplied to the column system is compressed to a base pressure level which is more than 5 bar above the pressure range at which the pressure column is operated, wherein nitrogen-rich gas is withdrawn from the pressure column, and wherein, at least in a first operating mode, further air is compressed to a pressure level above the base pressure level, is decompressed, and is warmed without fractionation in the column system, wherein, at least in the first operating mode, a portion of the nitrogen-rich gas withdrawn from the pressure column is fed into the further air upstream of the decompression.
An air fractionation plant comprising a column system having a pressure column, wherein the air fractionation plant is designed to operate the pressure column in a pressure range from 4 to 7 bar, to supply air to the column system, and to fractionate it in the column system, and to compress at least 90% of the total air supplied to the column system to a base pressure level which is more than 5 bar above the pressure range at which the pressure column is operated, to remove nitrogen-rich gas from the pressure column, and, at least in a first operating mode, to compress further air to a pressure level above the base pressure level, to decompress it, and to warm it without fractionation in the column system, wherein the air fractionation plant is designed to feed, at least in the first operating mode, a portion of the nitrogen-rich gas withdrawn from the pressure column to the further air upstream of the decompression.
Dependencies are inferred from the claim text.