On Predicting Char Burnout in Pulverized Coal Combustion

2015 ◽  
Vol 229 (5) ◽  
Author(s):  
Roman Weber ◽  
Marco Mancini
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Heterogeneous Reactions ◽  
Basic Knowledge ◽  
Pulverized Coal Combustion ◽  
Oxidation Rates ◽  
Char Burnout ◽  
Char Oxidation ◽  
Kinetics Of

AbstractThe objective of this paper is twofold: to summarise the basic knowledge on kinetics of heterogeneous reactions and to clarify several misconceptions concerning both derivation and usage of expressions for calculating char oxidation rates. This paper is concerned with char reactions only; coal devolatilization is not considered although it may affect char oxidation rates.

Development and Validation of a Coal Combustion Model for Pulverised Coal Combustion

2010 ◽  
Author(s):  
M. J. Chernetsky ◽  
A. A. Dekterev
Keyword(s):  
Coal Combustion ◽  
Pulverized Coal ◽  
Laboratory Scale ◽  
Combustion Model ◽  
Pulverized Coal Combustion ◽  
Nox Formation ◽  
Coal Particles ◽  
Model Predictions ◽  
Char Burnout ◽  
Development And Validation

To fully understand the processes of heat-and-mass transfer on the laboratory-scale and full-scale coal boilers, computer models are needed to develop, which can predict flow fields, heat transfer and the combustion of the coal particles with reasonable accuracy. In the work reported here, a comprehensive model for pulverized coal combustion has been presented. Attention has been given to the char burnout submodel, NOx formation sub-model and accurate calculation of the temperature of the particles. The model predictions have been compared with the experimental measurements of the laboratory-scale pulverized-coal combustion burner.

Nitric oxide destruction during coal and char oxidation under pulverized-coal combustion conditions

2004 ◽  
Vol 136 (3) ◽  
pp. 303-312 ◽  
Author(s):  
Alejandro Molina ◽  
Eric G. Eddings ◽  
David W. Pershing ◽  
Adel F. Sarofim
Keyword(s):  
Nitric Oxide ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Char Oxidation

CFD Modeling of Pulverized Coal Combustion in an Industrial Burner

2012 ◽  
Author(s):  
Marco Torresi ◽  
Bernardo Fortunato ◽  
Sergio Mario Camporeale ◽  
Alessandro Saponaro
Keyword(s):  
Experimental Data ◽  
Coal Combustion ◽  
Three Dimensional ◽  
Full Scale ◽  
Pulverized Coal ◽  
Cfd Modeling ◽  
Navier Stokes ◽  
Second Phase ◽  
Pulverized Coal Combustion ◽  
Char Burnout

The accurate prediction of pulverized coal combustion in industrial application still remains a great challenge. This is mainly due to the lack of high quality experimental data acquired during the operation of industrial plants. This work describes the CFD model used in order to numerically simulate the pulverized coal combustion of a full scale, swirl stabilized, aerodynamically staged, industrial burner. In particular, two different combinations of devolatilization and char burnout models were investigated comparing the numerical results with available experimental data obtained during a burner test carried out, in full-scale configuration, in a 50 MWth, fully instrumented, test rig. In order to avoid any unrealistic assumption on pulverized coal distribution at the burner inlet, the entire primary air duct for pulverized coal transportation has been considered. The main flow is computed solving the steady, incompressible, three-dimensional, Reynolds Averaged Navier-Stokes (RANS) equations, whereas the pulverized coal is simulated as a reacting discrete second phase in a Lagrangian frame of reference, computing the trajectories of the discrete phase entities, as well as heat and mass transfer. The numerical analysis confirms the very good burner performance obtained during the tests with a very low percentage of fixed carbon left in the ashes.

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