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Controllability analysis of industrial five effects evaporator system

Ekawati, E., LePage, G.A., Nooraii, A. and Bahri, P.A. (2003) Controllability analysis of industrial five effects evaporator system. In: Foundations of Computer Aided Process Operations (FOCAPO 2003), 12-15 January, 2003, Coral Springs, Florida



This paper reports on the controllability analysis of an industrial five-effects-evaporator process using the Dynamic Operability Framework. The process is associated with the liquor-burning unit of the Bayer process for alumina production. The control design problem is to reach a target density and to maintain the level on each flash tank as well as product temperature within limits with minimum operational costs. The problem is addressed by examination of various operational modes and control loops in the process superstructure. It involves the solution of a dynamic Mixed Integer Nonlinear Problem, as well as geometric representation of feasible operating space and process dynamic responses within the Dynamic Operability Framework. It is shown that the target density is achieved by using four effects operation and minimum variability is kept at minimum by appropriate control loops selection.

Publication Type: Conference Paper
Murdoch Affiliation: School of Engineering
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