Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
THE INFLUENCE OF AIR-SOLID FUEL RATE IN COMBUSTION PROCESS USING CFD
Submission Author:
Fábio Barros , PA
Co-Authors:
Fábio Barros, Pedro Silva, Danielle R S Guerra, Rodrigo Lima, Letícia Castelo Branco
Presenter: Fábio Barros
doi://10.26678/ABCM.COBEM2019.COB2019-1406
Abstract
In recent years many researchers have developed different numerical models to predict and optimize the combustion process. To develop such models is necessary to know the oxidation reactions and heat transfer between the combustion products and the wall of the chamber, which requires analysis of chemical kinetic mechanisms, flow behavior and heat transfer. The aim of this work is to analyze computationally, through Ansys Fluent comercial code, a cyclonic furnace for biomass burning, changing the air-fuel ratio to improve the operating conditions of the equipment. The multiphase flow was solved using Euler-Lagrange model, with the particles being treated as dispersed phase and their trajectories computed by Lagrange equations. For the gas phase reaction, the model used was the Finite-Rate / Eddy- Dissipation, where a two-step reaction was assumed. The k-e RNG model was used for turbulence because it shown a good concordance in cyclonic behavior and has a relatively low computational cost. The radiation effect was solved using the P1 approach method. With the results obtained it was possible to identify the region where the combustion occurs, the fields of velocity, temperature, concentrations of the chemical species, emission of exhaust gases and compare each equivalence ratio showing its main characteristics and their effects in combustion process.
Keywords
Combustion, Biomass, Cyclonic furnace, Reactive flows
