期刊
PROCESSES
卷 7, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/pr7090615
关键词
residence time distribution; continuous stirred tank reactor; bypassing; Fourier analysis; continuous manufacturing
资金
- Austrian COMET Program under Austrian Federal Ministry for Transport, Innovation and Technology (BMVIT)
- Austrian Federal Ministry of Digital and Economic Affairs (BMDW)
- Federal State of Styria (Styrian Funding Agency SFG)
The tanks-in-series model (TIS) is a popular model to describe the residence time distribution (RTD) of non-ideal continuously stirred tank reactors (CSTRs) with limited back-mixing. In this work, the TIS model was generalised to a cascade of n CSTRs with non-integer non-negative n. The resulting model describes non-ideal back-mixing with n > 1. However, the most interesting feature of the n-CSTR model is the ability to describe short recirculation times (bypassing) with n < 1 without the need of complex reactor networks. The n-CSTR model is the only model that connects the three fundamental RTDs occurring in reactor modelling by variation of a single shape parameter n: The unit impulse at n -> 0, the exponential RTD of an ideal CSTR at n = 1, and the delayed impulse of an ideal plug flow reactor at n ->infinity. The n-CSTR model can be used as a stand-alone model or as part of a reactor network. The bypassing material fraction for the regime n < 1 was analysed. Finally, a Fourier analysis of the n-CSTR was performed to predict the ability of a unit operation to filter out upstream fluctuations and to model the response to upstream set point changes.
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