A numerical algorithm is developed for a detailed 3D simulation of the two-phase flow field in fluid-energy mills used for pulverization and drying of fossil fuels in large power plants. The gas phase equations are solved using finite differences and the control volume method, whereas a Lagrangian formulation with a stochastic particle dispersion model is adopted for the particulate phase. Fluid-particle interaction is taken into account to calculate the mass, momentum, and heat transfer between phases. Advanced numerical techniques for partially-blocked cells and local grid refinement have been utilized to achieve an accurate representation of the domain geometry and to enhance the accuracy of the results. Particle collisions, fragmentation mechanism, and moisture evaporation are simulated by corresponding models, whereas the special treatment employed for the rotating fan region provides the capability to solve the two-phase flow simultaneously in the entire rotating and nonrotating mill domain. The flow and the operation characteristics of a recently developed lignite mill are measured, and the numerical algorithm is used to predict the mill performance under various inlet profiles of the fuel mass flow rate. The predicted results are reasonable, and in agreement with the available measurements and observations, thus offering a deeper insight into the complex dynamic and thermal behavior of the two-phase flow in the mill.
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June 2001
Technical Papers
Numerical Simulation of Grinding and Drying Performance of a Fluid-Energy Lignite Mill
J. Anagnostopoulos,
J. Anagnostopoulos
Department of Mechanical Engineering, Technological Education Institute of Kozani, Koila, 50100 Kozani, Greece
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G. Bergeles,
G. Bergeles
Laboratory of Aerodynamics, Department of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou ave., 15700 Zografou, Athens, Greece
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B. Epple,
B. Epple
ALSTOM Energy Systems GmbH, Augsburger Str. 712, D-70329 Stuttgart, Germany
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P. Stegelitz
P. Stegelitz
ALSTOM Energy Systems GmbH, Augsburger Str. 712, D-70329 Stuttgart, Germany
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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
ALSTOM Energy Systems GmbH, Augsburger Str. 712, D-70329 Stuttgart, Germany
P. Stegelitz
ALSTOM Energy Systems GmbH, Augsburger Str. 712, D-70329 Stuttgart, Germany
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division August 25, 1999; revised manuscript received October 18, 2000. Associate Editor: B. Schiavello.
J. Fluids Eng. Jun 2001, 123(2): 303-310 (8 pages)
Published Online: October 18, 2000
Article history
Received:
August 25, 1999
Revised:
October 18, 2000
Citation
Anagnostopoulos, J., Bergeles, G., Epple , B., and Stegelitz , P. (October 18, 2000). "Numerical Simulation of Grinding and Drying Performance of a Fluid-Energy Lignite Mill ." ASME. J. Fluids Eng. June 2001; 123(2): 303–310. https://doi.org/10.1115/1.1350820
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