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Titolo:
Simulation of the transient and steady state behaviour of a bubble column slurry reactor for Fischer-Tropsch synthesis
Autore:
de Swart, JWA; Krishna, R;
Indirizzi:
Univ Amsterdam, Dept Chem Engn, NL-1018 WV Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1018 WV V Amsterdam, Netherlands
Titolo Testata:
CHEMICAL ENGINEERING AND PROCESSING
fascicolo: 1, volume: 41, anno: 2002,
pagine: 35 - 47
SICI:
0255-2701(200201)41:1<35:SOTTAS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUIDIZED MULTIPHASE REACTORS; CHURN-TURBULENT REGIME; SCALE-UP STRATEGY; GAS HOLDUP; FLOW REGIME; HYDRODYNAMICS; MODEL; TRANSITIONS; TECHNOLOGY; SELECTION;
Keywords:
steady state behaviour; Fischer-Tropsch synthesis; bubble column slurry reactor;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Krishna, R Univ Amsterdam, Dept Chem Engn, Nieuwe Achtergracht 166, NL-1018 WV Amsterdam, Netherlands Univ Amsterdam Nieuwe Achtergracht 166 Amsterdam Netherlands NL-1018 WV
Citazione:
J.W.A. de Swart e R. Krishna, "Simulation of the transient and steady state behaviour of a bubble column slurry reactor for Fischer-Tropsch synthesis", CHEM ENG P, 41(1), 2002, pp. 35-47

Abstract

This paper develops a model to simulate the dynamic and steady-state behaviour of a commercial scale (diameter 7.5 m and dispersion height 30 m) Fischer-Tropsch bubble column slurry reactor operating in the churn-turbulent regime. A distinction is made between 'large' and 'small' bubble classes andthe axial dispersion model is used to simulate their mixing behaviour and also of the liquid and catalyst particle phases. The results of the dynamic simulations indicate that no thermal runaways are to be expected and that steady-state is achieved within about 7 min fromstart-up. Analysis of the steady-state behaviour shows that the hydrogen conversion in the reactor is mainly dictated by the 'large' bubbles, which account for a major fraction of the gas throughput. Comparison of the commercial scale reactor performance with that of a smaller scale demonstration unit (of diameter I m. and dispersion height 30 in)shows that due to significantly improved staging in the liquid phase, higher conversions are achieved in the demonstration unit, Furthermore, steep temperature gradients are to be expected in the demonstration unit, while these are absent in a reactor of commercial scale. The study underlines the need for accurate information on the liquid phase backmixing for scale up purposes. (C) 2002 Elsevier Science B.V. All rights reserved.

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Documento generato il 31/03/20 alle ore 19:06:35