344221 Optimization of Distillation Column and Separation System Design

Thursday, November 7, 2013: 5:27 PM
Continental 9 (Hilton)
Rodrigo Blanco, Process Systems Enterprise Ltd, London, United Kingdom

Distillation columns have traditionally been modelled using a sequential modular simulation approach. While well-established, the approach brings numerous challenges, particularly where highly-integrated systems involving heat and material recycles are involved.  On the other hand, users of the more powerful equation-oriented approach have traditionally struggled with the difficulty of obtaining an initial solution.

 This presentation describes how new model initialization techniques significantly simplify distillation modelling in equation-oriented software. This allows not only much more rapid solution, allowing sensitivity studies on complex separation systems, but also opens the door to large-scale optimization calculations involving both continuous and integer decisions (the latter, for example, including feed tray location and number of stages decisions), including whole-plant optimisation of separation sections simultaneously with reactors. The paper is illustrated with simulation of an air separation unit, among other examples.


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See more of this Session: Process Design II
See more of this Group/Topical: Computing and Systems Technology Division