International Conference on Applications of Radiation Science and Technology

Holdup Analysis of a Bubble Column Using an Industrial Fourth Generation Like $\gamma$-Ray Tomography

24 Apr 2017, 12:35

20m

Conference Room M2

Oral RADIATION TECHNOLOGIES FOR MEASUREMENT B01

Speaker

Mr Carlos H de Mesquita (Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP, Brazil)

Description

This work has been performed using the fourth-generation-like industrial computed tomography developed at the IPEN, constituted with $70$ NaI(Tl) $25.4~\mathrm{mm}\times50.8~\mathrm{mm}$ (diameter $\times$ length) and a bubble column for industrial process was evaluated. The column is a Perspex glass cylindrical tube of $80$ mm internal diameter, $100$ mm external diameter and $1400$ mm height constituted the following parts: liquid circuit (water), a gas circuit ($4~\ell/$min) bubbled into a system containing two limiting holes of $4$ mm and $2$ mm, located at $65$ mm from the centre of the column each one in opposite side. $\gamma$-ray tomography experiments were carried out, using this simulator column both empty and filled with water plus gas bubbling. In this work the scanner was set for $5$ views and $14$ projections each. The resulting images describe the liquid or gas phase holdup distributions for bubbles generated in a hole of $4$ mm and $2$ mm diameters located at $15$ mm of the column wall in a opposite side, respectively. It was established that the newly developed fourth-generation-like fan-beam arrangement $\gamma$-scanner unit has a good temporal resolution acceptable given the size of the column used in this study and capable to infer the relative proportional of gas and liquid proportion in the column.