Modelling of gaseous phase in bubble columns

1991 ◽  
Vol 56 (6) ◽  
pp. 1238-1248
Author(s):  
Jana Vašáková ◽  
Jan Čermák
Keyword(s):  
Gas Phase ◽  
Driving Force ◽  
Bubble Column ◽  
Dispersion Model ◽  
Correlation Method ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Axial Dispersion Model ◽  
Impulse Characteristics ◽  
Dispersion Layer

An axial dispersion model of a bubble column was verified by an experimental method based on pseudo-random binary signals of maximum length. The diameter of the column was 0.292 m and the height of the dispersion layer was 1.33 m. Water formed a stagnant liquid layer and a mixture of air with up to 5 vol.% of CO2 formed a streaming gas phase. The model was evaluated from the response of the bubble column to pseudo-random binary signals and from impulse characteristics calculated from this response by the correlation method. The use of the axial dispersion model with mass transfer was evaluated in dependence on the driving force.

Determination of the aeration capacity of bubble columns by dynamic method. The influence of axial dispersion and of the start-up period

1979 ◽  
Vol 44 (9) ◽  
pp. 2583-2597 ◽  
Author(s):  
Václav Linek ◽  
Jiří Stejskal ◽  
Jiří Sinkule ◽  
Václav Vacek
Keyword(s):  
Dynamic Method ◽  
Dispersion Model ◽  
Oxygen Electrode ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Oxygen Probe ◽  
Start Up ◽  
Axial Dispersion Model ◽  
Aeration Capacity

A dynamic method for the determination of volumetric mass transfer coefficient of oxygen, kLa, in bubble columns using an oxygen electrode was derived on the basis of a liquid phase axial dispersion model The influence of aeration startup was studied assuming that the kLa value is position and time dependent. The conditions are defined under which the influence of aeration startup and of axial mixing of the liquid upon the steady state kLa value is negligible. A critical assessment has been made of various methods proposed for evaluation of oxygen probe responses.

Applicability of axial dispersion model to analyze mass transfer measurements in bubble columns

AIChE Journal ◽  
1983 ◽  
Vol 29 (6) ◽  
pp. 915-922 ◽  
Author(s):  
W.-D. Deckwer ◽  
K. Nguyen-Tien ◽  
B. G. Kelkar ◽  
Y. T. Shah
Keyword(s):  
Mass Transfer ◽  
Dispersion Model ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Axial Dispersion Model

scholarly journals Gas Phase Back-Mixing in a Mimicked Fischer-Tropsch Slurry Bubble Column Using an Advanced Gaseous Tracer Technique

2018 ◽  
Vol 17 (2) ◽  
Author(s):  
Lu Han ◽  
Ibrahim A. Said ◽  
Muthanna H. Al-Dahhan
Keyword(s):  
Gas Phase ◽  
Bubble Column ◽  
Gas Holdup ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Bubble Column Reactor ◽  
Tracer Technique ◽  
Solids Loading ◽  
Slurry Bubble Column ◽  
Gaseous Tracer

Abstract An advanced gaseous tracer technique and procedures were developed and executed to study for the first time the axial dispersion of the gas phase in a slurry bubble column reactor (SBCR) using air-C9C11-FT catalyst. Residence time distribution (RTD) curves were obtained by measuring the pulse-input’s response of the gaseous tracer. The gas phase axial dispersion coefficient (Dg) was obtained from minimum square error fit of the one-dimensional axial dispersion model to the measured tracer response data. The effects of solids loading on the axial dispersion of gas phase and the overall gas holdup have been studied. It was demonstrated that increasing solids loading improves the gas axial dispersion while decreasing the overall gas holdup. This work suggests that gas phase axial dispersion is significant in reactor performance evaluation of bubble columns or slurry bubble columns.

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