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Control configuration selection for distillation columns
Author(s) -
Skogestad Sigurd,
Morari Manfred
Publication year - 1987
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690331006
Subject(s) - multivariable calculus , distillation , control theory (sociology) , fractionating column , controller (irrigation) , selection (genetic algorithm) , control (management) , control system , control engineering , configuration design , computer science , process engineering , engineering , chemistry , chromatography , artificial intelligence , agronomy , electrical engineering , biology , operating system
Most two‐product distillation columns can be described as 5 × 5 plants, but the control system design is usually simplified by means of the following procedure: 1 Choose two manipulated inputs for composition control (corresponding to a specific control configuration). 2 Design the level and pressure control system (usually three SISO controllers). 3 Design a 2 × 2 controller for composition control.This paper provides guidelines for step 1, which is considered the most important. Ratios (e.g., L/D or V/B ) are frequently chosen as manipulated inputs in step 1. It is shown that the ratio configurations are effectively complex multivariable controllers that provide, among other features, improved flow disturbance rejection.