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Control structure selection for four-product Petlyuk column

Abstract

Direct material coupling between column sections in distillation leads to energy efficient systems like the Petlyuk column but with more difficult control problems compared to conventional multicomponent distillation sequences. A control study of a four-product extended Petlyuk column operating close to minimum energy is reported here. We study the “ideal” case with all steady state degrees of freedom available for control, including the vapor split valves, which is required to achieve minimum energy under all conditions. Four decentralized control structures are proposed and tested against a wide range of disturbances. This work demonstrates also the use of the graphical Vmin tool which can be used to visualize the minimum boilup requirement for Petlyuk arrangements.

Category

Academic article

Language

English

Author(s)

Affiliation

  • SINTEF Digital / Mathematics and Cybernetics
  • Norwegian University of Science and Technology

Date

31.07.2012

Year

2012

Published in

Chemical Engineering and Processing

ISSN

0255-2701

Volume

67

Page(s)

49 - 59

View this publication at Norwegian Research Information Repository