Simulação numérica de fornos tridimensionais e análise de desempenho de ciclones

Abstract

In this work, the behavior of particles inside a themochemical reactor was studied with the aim of developing a grid able to maximize movement and homogenization of a fluidezed bed, in addition to researching the usage of cyclones to separate particles and increase gas residence time on the device. The evaluation of these cyclones was made by comparing the use of a similar axial and radial cyclone, the disposition, in series or parallel was also discussed. The reactor is used for thermodegradation of biomass and production of a fuel, synthesis gas, which consists in a multiphase misture of gas and suspended particles. Those particles have to stay inside the reactor until all matter that could undergo gasification is degrated, while the remaining particles are filtered by cyclones inside the reactor. In order to understand this behavior, simulations were carried out in the ANSYS® Fluent software, where a multiphase DPM model (Discrete Phase Model) and a k-ômega SST turbulence closure model were considered. The results obtained allowed confirmation that the cyclones in series promotes full separation of particles inside the reactor, as well as the developed grid model allows the absence of accumulation points in the device.