@conference{
author = "Kaps, Lothar and Seidel, Carsten and Marinković, Dalibor and Kienle, Achim and Seidel-Morgenstern, Andreas and Nikolić, Daliborka and Petkovska, Menka",
year = "2022",
abstract = "Continuous chemical processes are typically designed to operate under steady state
conditions. However, there is strong evidence that an optimized forced periodic
operation possesses the potential to improve process performance [1]. More
demonstration examples are needed to promote such advanced concepts.
In this contribution we will present results for two case studies. The first reaction
investigated is the liquid phase hydrolysis of acetic anhydride performed in an adiabatic
continuous stirred tank reactor (CSTR). The second examples is the heterogeneously
catalysed gas phase synthesis of methanol performed in an isothermal and isobaric
CSTR. Our theoretical analysis exploits independently determined kinetic models of
these reactions [2, 3]. Besides performing numerical process simulations the Nonlinear
Frequency Response (NFR) method [4] is used. The magnitude of possible process
improvements depends on the applied strategy of forced periodic operation. Besides
the input to be perturbed (concentration, flowrate, temperature, …), the forcing
frequency and the forcing amplitude as well as the shape of the input modulation are
of relevance. In this contribution we will compare the input modulated as harmonic
(Fig 1a) and as a square wave function (“bang-bang”, Fig 1b). In order to use the NFR
method for the latter input function an approximation via Fourier series is applied [5, 6].
The results reveal improvements of easier to practically implement square wave inputs
for both examples considered, compared to harmonic modulation of inputs [5, 6].",
publisher = "DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)",
journal = "Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022 Congress Center Würzburg, Germany",
title = "Evaluating the shape of input pertubation for forced periodic operation",
pages = "177-178",
url = "https://hdl.handle.net/21.15107/rcub_cer_6314"
}
