Numerical Simulation of Grinding and Drying Performance of a Fluid-Energy Lignite Mill

[+] Author and Article Information
J. Anagnostopoulos

Department of Mechanical Engineering, Technological Education Institute of Kozani, Koila, 50100 Kozani, Greece

G. Bergeles

Laboratory of Aerodynamics, Department of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou ave., 15700 Zografou, Athens, Greece

B. Epple, P. Stegelitz

ALSTOM Energy Systems GmbH, Augsburger Str. 712, D-70329 Stuttgart, Germany

J. Fluids Eng 123(2), 303-310 (Oct 18, 2000) (8 pages) doi:10.1115/1.1350820 History: Received August 25, 1999; Revised October 18, 2000
Copyright © 2001 by ASME
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Polar grid lines and control volumes in a typical mill arrangement
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Treatment of partially-blocked cells
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Information transfer between the main and a locally refined grid
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Elementary fluid volume between two neighboring plates
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Simulated mill geometry and grid-lines arrangement
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Gas velocity vectors at two vertical sections of the mill
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Gas velocity vectors in the mill, at various r-θ planes
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Contours of temperature distribution (a), and water vapor concentration (b), at a vertical cross-section of the mill (x=−0.3 m)
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Water vapor concentration at a vertical cross-section (x=0.05 m)
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Water vapor concentration in the mill, at various r-θ planes
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Contours of temperature distribution (a, °C), and H2O mass concentration (b), at an r-θ plane (θ=110 deg)
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Indicative particle trajectories of the produced fragments (size in μm) of 12 mm raw lignite particles, launched from: lower part (a), and upper part (b)
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Size distribution of the produced lignite fragments
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Calculated fuel moisture content at the mill exit (percent, wet basis)




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