This work reports the development of an advanced CFD model for pulverizing coal combustion, performed with the commercial CFD code Fluent. Coal combustion is characterized by complex chemical-physical phenomena, that require to be modeled through an advanced mathematical approach. Two different approaches are considered. The first one , defined as EDM-SR, is based on a simple single-rate (SR) empirical devolatilization model and on the Eddy Dissipation Model (EDM) for chemical-turbulence interactions, considering initely fast chemical reactions. It represents a standard approach used for pulverized coal combustion simulations. The second approach, defined as EDC-CPD, is based on advanced Chemical Percolation Devolatilization (CPD) model, and on Eddy Dissipation Concet (EDC) for chemical-turbulence interactions. The results are compared with experimental data performed on IFRF no.1 furnace. The EDC-CPD approach shows the best agreement with experimental data in terms of velocities, temperature and species concentrations. The use of this approach is therefore more suitable for modeling pulverized coal combustion, nevertheless the higher CPU time required.

Sviluppo e validazione di un modello CFD avanzato per la combustione del polverino di carbone

CAU, GIORGIO
2009

Abstract

This work reports the development of an advanced CFD model for pulverizing coal combustion, performed with the commercial CFD code Fluent. Coal combustion is characterized by complex chemical-physical phenomena, that require to be modeled through an advanced mathematical approach. Two different approaches are considered. The first one , defined as EDM-SR, is based on a simple single-rate (SR) empirical devolatilization model and on the Eddy Dissipation Model (EDM) for chemical-turbulence interactions, considering initely fast chemical reactions. It represents a standard approach used for pulverized coal combustion simulations. The second approach, defined as EDC-CPD, is based on advanced Chemical Percolation Devolatilization (CPD) model, and on Eddy Dissipation Concet (EDC) for chemical-turbulence interactions. The results are compared with experimental data performed on IFRF no.1 furnace. The EDC-CPD approach shows the best agreement with experimental data in terms of velocities, temperature and species concentrations. The use of this approach is therefore more suitable for modeling pulverized coal combustion, nevertheless the higher CPU time required.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/25345
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