Modified approach to distillation column control

Saša Lj. Prodanović, Novak N. Nedić, Vojislav Ž. Filipović, Ljubiša M. Dubonjić


This paper contains methodology research for forming the control algorithm for a distil­lation column, modeled as TITO (two-input two-output) process. Its modified form was obtained by connecting the two parts, and this combination hasn't been applied for such a industrial plant, until now. These parts include: a simplified decoupler which was first designed and decentralized PID controller obtained using D-decomposition method for such decoupled process. The decoupler was designed in order to make process become diagonal, and parameters of PID controllers are defined for the two SISO (single-input single-output) processes starting from relation between IE (integral error) criterion and integrator gain, taking into account desired response characteristics deriving from tech­nological requirements of controlled plant. Their connecting provides centralized control. Analysis of the processes responses, obtained by the proposed algorithm and their com­par­ison with the results from the literature, were performed after the completion of the simulations. The proposed approach to the centralized controller design, beside its sim­plicity of usage and flexibility in achieving diversity of process dynamic behavior, gives better response characteristics, in comparison with existing control algorithms for distil­lation column in the literature.


distillation column; decentralized controller design; decoupling control; PID control; D-decomposition; simulation

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