Numerical simulation of grinding and drying performance of a fluid-energy lignite mill

 
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2001 (EL)

Numerical simulation of grinding and drying performance of a fluid-energy lignite mill (EN)

Bergeles, G (EN)
Anagnostopoulos, J (EN)
Epple, B (EN)
Stegelitz, P (EN)

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. © 2001 ASME. (EN)

journalArticle (EN)

Fragmentation mechanism (EN)
3D simulations (EN)
Fuel mass (EN)
Inlet flow (EN)
Three dimensional computer graphics (EN)
Domain geometry (EN)
Operation characteristic (EN)
Drying performance (EN)
Complex dynamics (EN)
Numerical techniques (EN)
Mill performance (EN)
Particle dispersion model (EN)
Two phase flow (EN)
Computer simulation (EN)
Gas phase equations (EN)
Thermal behaviors (EN)
Numerical Simulation (EN)
Control volume methods (EN)
Local grid refinement (EN)
Fossil fuels (EN)
Fluid-particle interaction (EN)
Particle collision (EN)
Engineering, Mechanical (EN)
Lignite (EN)
Algorithms (EN)
Lagrangian formulations (EN)
Numerical algorithms (EN)
Finite difference (EN)
Stochastic models (EN)
Special treatments (EN)
Moisture evaporation (EN)


Journal of Fluids Engineering, Transactions of the ASME (EN)

Αγγλική γλώσσα

2001 (EN)

10.1115/1.1350820 (EN)
0098-2202 (EN)
ISI:000169370800014 (EN)
123 (EN)
2 (EN)
310 (EN)
303 (EN)

ASME-AMER SOC MECHANICAL ENG (EN)




*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.