Nonintrusive frequency analysis for variable pairing on a distillation column
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Updated: Aug 18, 2026

Curtain Flow Column: Optimization of Efficiency and Sensitivity
Published on: June 12, 2016
Glen Hay1, William Y Svrcek, Brent R Young
1Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada, T2N 1N4.
Abstract:
This paper describes a nonintrusive plant analysis technique for variable pairing that relies on power spectrum frequency analysis. The development of the method is described and guidelines for the implementation of the method are presented. Information gathered from the frequency analysis is used in variable pairing to ensure minimal impacts from unmeasured disturbances. Specifically, the nested epsilon decomposition method for variable pairing is used. This nonintrusive analysis method is implemented on a pilot plant distillation column. The results of the pilot plant test are used in the decoupling of a multiloop control system.
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