MODELING ISSUES FOR CONTROL-STRUCTURE SELECTION IN A CHEMICAL PROCESS

A highly-integrated nonlinear dynamic model of the KDA process has bee n used in the past for control structure selection studies. The origin al model consists of many unit operations including three distillation columns. These columns were originally modelled by Brognaux (1992) us ing the Shortcut Library models available within SpeedUp. In this work , the HDA case study is revisited but the nonlinear model has been rev ised to include modified models for the distillation columns and other unit operations; The modelling issues associated with the development of this more rigorous HDA model are discussed in the context of its u se for control structure selection. (C) 1998 Elsevier Science Ltd. All rights reserved.