"Given their efficiency and capital cost reduction, bubble/slurry bubble column reactors are the reactors of choice for Fischer-Tropsch (FT) synthesis, offering clean alternative fuels and chemicals. FT synthesis is an exothermic process that requires many heat exchanging tubes in order to remove heat efficiently and maintain the desired temperature and isothermal operating condition. The impact of the heat exchanging tubes (internals) on the hydrodynamics is not fully understood. Reliably designing and scaling up bubble column reactors requires proper understanding of hydrodynamics, as well as heat and mass transfer parameters.
The main objective of this work is to advance the understanding of the effect of internals (25% covered cross-sectional area to meet FT needs) on hydrodynamics (gas holdup distribution, 3D liquid velocity, Reynolds stresses, turbulent kinetic energy, eddy diffusivity, etc.) in bubble columns. Single-source y-ray Computed Tomography (CT) and Radioactive Particle Tracking (RPT) were used for the first time to study the effect of dense internals and gas velocity on the phase holdup distribution and radial profiles, liquid velocity field and turbulent parameter profiles.
The main findings obtained for the first time in this study can be summarized as follows:
- The presence of internals at a given superficial gas velocity causes:
- An increase in gas holdup and the axial centerline liquid velocity
- A sharp decrease in turbulence parmeters
- The increase in superficial gas velocity in the presence of internals causes:
- An increase in gas holdup, axial centerline liquid velocity and turbulent parameters.
Al-Dahhan, Muthanna H.
Neogi, P. (Partho), 1951-
Wang, Jee C.
Chemical and Biochemical Engineering
Ph. D. in Chemical Engineering
Missouri University of Science and Technology
xvii, 179 pages
© 2013 Mohammed Khloofah Al Mesfer, All rights reserved.
Dissertation - Restricted Access
Chemical reactors -- Fluid dynamics -- Mathematical models
Multiphase flow -- Mathematical models
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu:80/record=b10118954~S5
Al Mesfer, Mohammed Khloofh, "Effect of dense heat exchanging internals on the hydrodynamics of bubble column reactors using non-invasive measurement techniques" (2013). Doctoral Dissertations. 27.
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