Premium
Optimal two point control of a binary distillation column
Author(s) -
Chan Alan L.,
Talbot Frank D.
Publication year - 1975
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450530116
Subject(s) - controller (irrigation) , fractionating column , control theory (sociology) , distillation , optimal control , tray , column (typography) , binary number , computer science , product (mathematics) , work (physics) , process engineering , control (management) , mathematics , mathematical optimization , engineering , chemistry , chromatography , mechanical engineering , artificial intelligence , agronomy , biology , telecommunications , geometry , arithmetic , frame (networking)
Optimal two point control and operating policies have been developed for a semi‐works scale 10 tray distillation column separating methanol and water. Two controllers, based on different control philosophies were synthesized. They are:1 The controller that will bring the product compositions to their desired values while keeping off‐specification products to a minimum. 2 The controller that will bring the product compositions to their desired values while maintaining the average product composition of the control period at the desired level.Two types of disturbances were studied, namely disturbances in the feed stream and changes in product specifications. The column operation was represented by a linearized dynamic mathematical model based on a component material balance. The solution of the problem was obtained by application of the minimum principle of Fontryagin and the modified Riccati transformation technique. Simplified optimal control schemes can be developed from the results of this work. These control schemes are simple enough to be used for direct digital computer control.