Influence of vertical internals on a bubbling fluidized bed characterized by X-ray tomography |
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Institution: | 1. Energy Systems Engineering Group, Thermal and Fluids Engineering Department, Carlos III University of Madrid, Avda. de la Universidad 30, 28911 Leganés Madrid, Spain;2. Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands |
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Abstract: | An ultra-fast X-ray tomographic scanner is applied to study the hydrodynamics in a bubbling fluidized bed with and without vertical internals (e.g., heat exchanger tubes). The objective of this study is to understand the influence of vertical internals on hydrodynamic properties such as bubble volume, size and velocity and to provide measurement data for the design and scale-up of catalytic bubbling fluidized bed reactors with vertical internals. With these new measurements, correlations of bubble properties can be developed to reliably scale-up bubbling fluidized beds with vertical internals. For the investigated reactor with Geldart A/B particles, no relation between bubble size and velocity was observed for individual bubbles, i.e.; smaller bubbles tend to rise with higher velocities. A significant reduction in bubble size and sharpening of the bubble size distribution was generally obtained for a bed with vertical internals. |
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Keywords: | X-ray Fluidized bed Scale-up Optical probe measurement Sector scaling Vertical tubes Internals |
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