Prediction of coal combustion in a commercial boiler by computational fluid dynamics (CFD) requires a combination of complicated flow and reaction models for turbulence, radiation, discrete particle flows, devolatilization and heterogeneous char react...
Prediction of coal combustion in a commercial boiler by computational fluid dynamics (CFD) requires a combination of complicated flow and reaction models for turbulence, radiation, discrete particle flows, devolatilization and heterogeneous char reactions, and gaseous reactions. There are various levels of models available for each of these phenomena, but the use of advanced models are significantly restricted due to the computational costs and the balance of the accuracy between different models. The validation of the results is also very difficult because of the limitations in measured data. This study investigated the effects of adopting different models for key phenomena of coal combustion in a 500㎿e opposed firing boiler. The results were assessed by comparison with gas temperature measurement. The appropriate flow or reaction models were recommended on the viewpoint of the practicality of comparative simulations for operating conditions.