关键词: distillation;nonlinearity;variable scaling;multi-model representation;feedforward compensation;process control;closed-loop simulation

Abstract: Dual-point composition control for a high-purity ideal heat integrated distillation column
(HIDiC) is addressed in this work. Three measures are suggested and combined for overcoming
process inherent nonlinearities:(1) variable scaling; (2) multi-model representation of
process dynamics and (3) feedforward compensation. These strategies can offer the developed
control systems with several distinct advantages: (1) capability of dealing with severe
disturbances; (2) tight tuning of controller parameters and (3) high robustness with
respect to variation of operating conditions. Simulation results demonstrate the
effectiveness of the proposed methodology.

Key words: distillation, nonlinearity, variable scaling, multi-model representation, feedforward compensation, process control