Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
APPLICATION OF THE WSGG MODEL TO DETERMINE THE INFLUENCE OF SOOT PARTICLES ON RADIATION IN THE COMBUSTION PROCESS OF A 320MW POWER PLANT BOILER
Submission Author:
Conrado Ermel , RS , Brazil
Co-Authors:
Cristiano Vitorino da Silva, Luís Felipe Dondoni, Paulo Smith Schneider, Felipe Roman Centeno
Presenter: Cristiano Vitorino da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0647
Abstract
In this paper, the WSGG (Weighted Sum of Gray Gases) model is applied to determine the influence of soot particles on radiation in the combustion process of a 320MW power plant boiler, using Computational Fluid Dynamics (CFD). Through a mathematical formulation, involving the conservation equations, devolatilisation models, the EBU Arrhenius model, NOx formation mechanisms, soot particle model, the Discrete Transfer Radiation Model and a special radiation model, combining the WSGG with soot particles, four different cases are analysed. The results generated by the simulations show that there are perceptible differences in the outlet temperature between the cases, specially in the first one (Case GG – Gray Gas) compared to the others (Case A – WSGG; Case B – WSGG including soot model; and Case C – the most complete case, which integrates the soot particles coefficients in the global WSGG model). However, the values of the wall heat flux and the wall radiative heat flux are similar for the first and the fourth cases. Finally, the simulations indicate that if the WSGG model is used without considering soot particles, errors can be generated in the results, while that the GG model can be used in several applications similar to the one reported in this paper, with acceptable compromising of results’ accuracy.
Keywords
WSGG model, Soot, Pulverized Coal, CFD, Combustion
