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Specific Energy Consumption (SEC) for pipeline transport of liquid CO2 slurries Open Access


Other title
liquid CO2 slurry pipeline
coarse particle slurries with low carrier fluid viscosities
liquid CO2 slurries
coefficient of friction
Specific Energy Consumption
Type of item
Degree grantor
University of Alberta
Author or creator
Hegde, Rajesh
Supervisor and department
Sanders, Sean (Chemical and Materials Engineering)
Examining committee member and department
Rajendran, Arvind (Chemical and Materials Engineering)
Kumar, Amit (Mechanical Engineering)
Nazemifard, Neda (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
In this study, Specific Energy Consumption (SEC) was used as a basis to optimize the operating conditions (pipe diameter, particle size and solids concentration) for a hypothetical liquid CO2 slurry pipeline, carrying petroleum coke (“pet coke”) or sulfur particles. The optimum particle size and solids concentration were found to be 100-150μm and approximately 30% by volume respectively. Calculations of SEC involve prediction of the flowing slurry’s frictional pressure gradient, obtained here using the Saskatchewan Research Council’s two-layer model. However, the model and some of the correlations it contains have not yet been tested for low carrier fluid viscosities, which is the case for liquid CO2, whose viscosity is one order of magnitude lower than water. To test the applicability of the model’s kinematic friction correlation for slurries with low carrier fluid viscosities, a 50 mm (diameter) pipe loop was designed and built to test slurries of pet coke in hot water at 700C. The performance of the correlation gave a direct indication of the error in the SEC calculations made for liquid CO2 slurries in industrial pipe sizes. In addition to evaluating the performance of the model’s kinematic friction correlation for slurries with low carrier fluid viscosities, effort was put to improve the model’s Coulombic friction estimation. As Coulombic friction estimation in the model requires knowledge of the coefficient of friction, a simple technique to measure this parameter for various particle-pipe material combinations was proposed.
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.
Citation for previous publication
Spelay, R., S.A. Hashemi, D.P. Gillies, R. Hegde, R.G. Gillies and R.S. Sanders, “Governing friction loss mechanisms and the importance of off-line characterization tests in the pipeline transport of dense coarse-particle slurries”, Proceedings of the ASME 2013 Fluids Engineering Summer Meeting, July 7-11, Incline Village, Nevada, USA (2013).

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