Abstract
A nonlinear-model-based control scheme for concentration profile position control of a heat integrated distillation column (HIDiC) is presented. First, a nonlinear wave model of the HIDiC is introduced to describe the concentration profile and its propagation velocity. Second, a distributed concentration wave profile velocity is developed to analyze the degree of the entire concentration profile deformation. Then, on the basis of the distributed wave velocity, a model updating method is proposed to determine a proper model parameter updating frequency so as to reduce the computing redundancy while guaranteeing the model accuracy. Finally, the nonlinear wave model and its updating method are combined to generate a model-based control scheme for the HIDiC, and controllers based on different model updating strategies are compared to evaluate the performance of the proposed model updating method.
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