Journal
CHEMICAL ENGINEERING SCIENCE
Volume 117, Issue -, Pages 71-84Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2014.06.013
Keywords
Non-isothermal CSTR; Nonlinear dynamics; Mathematical modelling; Chemical reactors; Simulation; Nonlinear frequency response method
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Funding
- Serbian Ministry of Science [172022, III45001]
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Periodic operations of a non isothermal CSTR with n-Lh order reaction, subject to a single input modulation, is analysed using the nonlinear frequency response (NFR) method, introduced in our previous publications. The method is based on deriving the asymmetrical second order frequency response function (FRE) and analysing its sign. In Part I of this paper, periodic operation with modulation of the inlet concentration or flow rate of the reaction stream is analysed. As a result, conditions regarding the reaction order, process parameters and frequency of the input modulation are identified that need to be fulfilled in order to achieve process improvement through the periodic operation compared to conventional steady state operation. The method is applied for a numerical example from literature and the results obtained by the NFR method are compared with the results of numerical simulation. Good agreement is obtained, except for imposed forcing frequencies close to the resonant frequency and high forcing amplitudes. (C) 2014 Elsevier Ltd. All rights reserved.
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