Procedure for improving dynamic operability of chemical processes

  • Kwon, Youngwoon (Department of Chemical Engineering, Seoul National Univ., Seoul 151-742) ;
  • Chang, Tae-Suk (Department of Chemical Engineering, Seoul National Univ., Seoul 151-742) ;
  • Yoon, En-Sup (Department of Chemical Engineering, Seoul National Univ., Seoul 151-742)
  • Published : 1995.10.01

Abstract

A simple and effective method for improving Euclidean norm condition number for chemical processing system is presented. The singular value sensitivities of Freudenberg et al. (1982) is used to estimate the behavior of singular values of process transfer function matrix when design parameter is changed, then the condition number can be calculated straightforwardly. The method requires explicit dependencies of each transfer function matrix elements on design parameters. These dependencies can be obtained either by symbolic differentiation in the form of explicit function of design parameters, or by numerical perturbation studies for units with large and complicated models. Gerschgorin-type lower bound for minimum singular value is introduced to detect the large divergencies near singular point due to linearity of sensitivities. The case studies are performed to show the efficiency of the proposed method.