Dynamic simulation of packed distillation columns using orthogonal collocation on finite elements

HAPOĞLU H., BALAS L.

International Journal of Modelling and Simulation, cilt.19, sa.1, ss.101-110, 1999 (Scopus)

Özet

The unsteady-state behaviour of binary and multicomponent packed distillation columns is simulated using two film plug flow and back-mixing models. The model solutions are obtained employing orthogonal collocation on finite elements. The use of Jacobi, Legendre, or Hermite polynomials within the finite element procedure is compared with an approach employing the Galerkin criterion. Results from the three polynomial procedures are very similar. However, in cases where more than three collocation points are required, the incorporation of cubic Hermite polynomials gave the most efficient routine in terms of CPU time on a VAX 8820 computer. The Galerkin procedure proved to be the least efficient. Orthogonal collocation on finite elements is demonstrated to be a powerful and efficient method of solution of the models. Close agreement with experimental results reported by other workers is obtained, suggesting that the procedures described form a good basis for column control.