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Permanent link (DOI): https://doi.org/10.7939/R3K931D1N

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Low Temperature Fluidized Bed Coal Drying: Experiment, Analysis and Simulation Open Access

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Other title
Subject/Keyword
Fluidized bed, coal drying, CFD
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Dejahang, T
Supervisor and department
Dr. Rajender Gupta, Department of Chemical and material engineering
Examining committee member and department
Dr. Petr Nikrityuk and Dr. Neda Nazemifard, Department of chemical and material engineering
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2015-04-01T09:53:30Z
Graduation date
2015-06
Degree
Master of Science
Degree level
Master's
Abstract
Drying kinetic of Canadian lignite was studied in a pilot scale fluidized bed dryer using low temperature air (T≤70 ˚C). Minimum fluidization velocity was calculated and applied to the experiment. Samples showed poor fluidization due to large particle size (1-2.8 mm) and density (1400 kg/m3). The effect of drying parameters was studied experimentally. Gas temperature showed a great effect on increasing drying rate in the constant drying period and low effect in the falling rate period. Increasing gas velocity proved to be poorly effective in drying due to low fluidization. Smaller particle size led to higher drying rate. Drying curves were curve fitted to available kinetic models in the literature and logarithmic model showed the best fit. Diffusion coefficient, activation energy and pre-exponential factor of lignite drying were calculated and showed good agreement with reported values in the literature. CFD analysis was carried out in Ansys-Fluent 14.0 and tuning the solid-fluid exchange coefficient, the constant rate drying period was successfully simulated. Spontaneous combustion kinetics of Canadian lignite was studied experimentally and analytically.
Language
English
DOI
doi:10.7939/R3K931D1N
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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