Investigating The Influence Of Fines In
Fluidized Bed Reactors Using 3D ECT Images
Author(s)
C. Rautenbach, M. C. Melaaen & B. M. Halvorsen
Abstract
Electrical Capacitance Tomography (ECT) has become a useful measurement
tool in process technology applications, especially in fluidized bed research. The
ECT system is neither intrusive nor invasive which make the system practically
viable for monitoring the internal flow behaviour in a fluidized bed. The sensor
is placed on the outside of the non-conductive experimental reactor thus making
implementation very convenient. ECT also presents user friendly equipment that
is safe and easy to use compared to some of the other tomographic modalities
currently available.
There has been postulated that the insertion of fines into a powderwill give more
uniform flow behaviour in a fluidized bed. Smaller and more evenly distributed
bubbles are observed. These conditions lead to better mixing of gas and solids in a
fluidized bed and thus improving the reactions in the reactor. These phenomena
have been investigated in the present study using ECT and a reconstruction
program developed in the present study. This reconstruction program created
three dimensional images of the fluidized bed reactor under consideration. The
reconstructions allow the user to get a three dimensional visual image of the flow
behaviour inside the experimental reactor without disturbing the flow. Bubbleand
bed characteristics of several powders with different percentages of fines
were investigated. The volume, location and shape of individual bubbles were
studied and thus the average bubble size, volume and frequency of a particular
experimental set up was calculated. These quantities are of great importance for
numerous industrial applications. Applications of these results are in almost all
fields involving fluidization. The research is part of ongoing global research in
optimizing and understanding fluidized beds better.
Keywords
fluidization, ECT, fines, bubble characteristics
Related Book
Other papers in this volume
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