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Cyclic operation as optimal control reflux policy of binary mixture batch distillation

Stojkovic, Marija and Gerbaud, Vincent and Shcherbakova, Nataliya Cyclic operation as optimal control reflux policy of binary mixture batch distillation. (2018) Computers and Chemical Engineering, 108. 98-111. ISSN 0098-1354

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Official URL: http://dx.doi.org/10.1016/j.compchemeng.2017.09.004

Abstract

We revisit the maximum distillate optimal control problem of batch distillation of non-ideal binary zeotropic mixtures. The direct method with full discretization is used. The problem formulation is based on full column dynamics and the distillate flow rate is used as control variable instead of the reflux. The purity constraint is handled as a new state variable, the purity deviation. Literature simulations showed that the cyclic reflux policy (bang-bang type control) performs better than variable reflux (singular type control) or constant reflux policy for small amount of light product in the load. For the first time, a cyclic reflux policy is found as the optimal control solution. The results are confirmed by rigorous simulation of the batch distillation, as the cyclic policy improves by 13% the product recovery over the variable reflux policy. Influence of the relative volatility, vapour flow rate, plate hold-up and initial load is discussed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com. The original PDF of the article can be found at :https://www.sciencedirect.com/science/article/pii/S0098135417303095
HAL Id:hal-01712467
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Vincent GERBAUD
Deposited On:19 Feb 2018 14:16

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