Identification of a Pilot Plant Crystallization Process with Output Error Methods

Abstract Results shown of the identification of a three input two output pilot plant evaporative crystallizer (970 litre), in which the Crystal Size Distribution (CSD) is the main characteric of the process to be modelled, and subsequently to be controlled. The experimental situation is characterized by short observaron times and a bad signal to noise ratio of the CSD measurement device. A three step identification procedure is applied, consisting of high order ARX modelling reduction though approximate realization based on step response matrices, and finally output error optimization in a pseudo-canonical (overlaping) state space parametrization.