Cryogenic Air Rectification System, Control Unit, Air Separation Unit And Method Of Cryogenically Separating Air

Abstract: The invention relates to a cryogenic air rectification system (10) comprising high a pressure column (11), a low pressure column (12) and an argon removal unit (13) coupled to a condenser evaporator (13.1), wherein the system (10) is configured to pass gas from a position above an oxygen section (12.4) of the low pressure column (12) as an argon removal feed gas to a lower region of the argon removal unit (13), wherein the system (10) is configured to condense gas from an upper region of the argon removal unit (13) in the condenser evaporator (13.1) to form a condensate, wherein the system (10) is configured to pass further gas from the top of the upper region of the argon removal unit (13) out of the system (10), and wherein the system (10) is configured to pass at least a part of the condensate as a reflux to the upper region of the argon removal unit (13) The system (10) comprises a control unit (20) configured to control an oxygen content of the argon removal feed gas as a controlled variable using a flow of the further gas from the top of the upper region of the argon removal unit (13) being passed out of the system (10) as a manipulated variable on the basis of a oxygen content determined in the argon removal feed gas using a feedback control structure. The condenser evaporator (13.1) is configured to at least partly evaporate a coolant forming an evaporated gas, and the system (10) is configured to pass the evaporated gas, or a part thereof, uncontrolledly into the low pressure column (12). A control unit (20), an air separation unit (100) and a method of cryogenically separating feed air is also part of the invention.

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