Effects of the mass and volume shrinkage of ground chip and pellet particles on drying rates |
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| Affiliation: | 1. Chemical and Biological Engineering Department, University of British Columbia, Vancouver, BC V6T 1Z3, Canada;2. Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37381, USA;1. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China;2. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;3. Department of Physics, Shanghai Normal University, Shanghai 200234, China;4. Helmholtz-Zentrum Dresden Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, D-01328 Dresden, Germany;5. Department of Physics, Soochow University, Taipei 11102, Taiwan;1. Institute for Chemicals and Fuels from Alternative Resources, Western University, 22312 Wonderland Rd., Ilderton, ON, N0 M2AO, Canada;2. Edmonton Research Centre, Syncrude Canada Ltd, 9421 17th Ave, Edmonton, AB, T6N 1H4, Canada;3. The Petroleum Institute, PO Box 2533, Abu Dhabi, UAE;1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden;2. Department of Applied Mechanics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden;1. Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, China;2. Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton Campus, Victoria, Australia |
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| Abstract: | The effects of varying the mass and volume of ground chip and pellet particles on the particle drying rate were analyzed. Samples of whole pellets and chips were hammer milled using a 3.2 mm screen and the ground chip and pellet particles were found to have similar size distributions, although the pellet particles were denser and more spherical than the chip particles. Prior to drying, water was added to the particles to obtain 0.10, 0.30, 0.50, 0.70, and 0.90 moisture contents (on a dry mass basis). The moistened particles were subsequently dried in a constant temperature thin layer dryer set at 50, 100, 150, or 200 °C under dry pure nitrogen, dry compressed air, or atmospheric air. The chip and pellet particles exhibited similar degrees of shrinkage, but the pellet particles underwent a greater reduction in their bulk volume during drying. It appears that the more spherical pellet particles are prone to shrinkage in more than one direction, whereas the needle-like chip particle shrink only in one direction. A variable radius first order drying model was found to fit the experimental data better than a fixed radius model. |
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| Keywords: | Moisture loss Particle density Ground chip Ground pellet Particle shrinkage Bulk shrinkage |
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