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Open AccessArticle

Comparing Composition Control Structures for Kaibel Distillation Columns

College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
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Author to whom correspondence should be addressed.
Processes 2020, 8(2), 218; https://doi.org/10.3390/pr8020218 (registering DOI)
Received: 2 December 2019 / Revised: 5 February 2020 / Accepted: 10 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Process Optimization and Control)
Although Kaibel distillation columns are superior to conventional distillation sequences owing to smaller equipment investment and operation cost, they display high nonlinearity and this greatly increases the difficulty of achieving their tight control. To overcome this problem, four decentralized composition control structures, i.e., the CSR/QR, CSR/B, CSD/QR, and CSD/B structures, are proposed and compared based on the control of a Kaibel distillation column fractionating a methanol/ethanol/propanol/butanol quaternary mixture. These four composition control structures all include five composition control loops. While the four of them are employed to maintain the purity of the top, upper sidestream, lower sidestream, and bottom products, the remaining one is employed to minimize the energy consumption of the Kaibel distillation column by maintaining the composition of propanol at the first stage of the prefractionator. Dynamic simulation results show the CSR/QR and CSR/B structures can tightly maintain the purity of the controlled products with a small overshoot and short settling time after facing various disturbances in feed conditions, but the CSD/QR and CSD/B structures lead to oscillatory responses (the latter even shows divergent responses under individual disturbances). At the end of the article, some effective guides for developing composition control systems are given. View Full-Text
Keywords: Kaibel distillation column; PID; DWDC; process control; composition control Kaibel distillation column; PID; DWDC; process control; composition control
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MDPI and ACS Style

Yuan, Y.; Huang, K.; Chen, H.; Qian, X.; Zang, L.; Zhang, L.; Wang, S. Comparing Composition Control Structures for Kaibel Distillation Columns. Processes 2020, 8, 218.

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