Abstract
Digital twins of process plants provide various opportunities to improve plant operation by in silico studies. A major advantage of a simulation-based digital twin is its availability prior to the physical plant. Thus, it can be used for design purposes. In this work, dynamic simulation studies of a novel air separation unit topology are conducted to develop a reliable control strategy. This novel air separation design includes an integrated argon removal column. That is, a column with the intent to remove an argon-rich fraction is included into the low-pressure column by means of a divided wall section. The liquid reflux for the integrated argon removal column is generated by an additional condenser/reboiler in the low-pressure column above the divided wall section. The intent of the argon removal is to increase the energy efficiency of large scale air separation units for oxygen production. Using the digital twin, three multi-loop PID control strategies are compared regarding reliable operability.
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