Secagem de grãos de arroz em leito fluidizado

Abstract

To verify the fluidization conditions and evaluate the operational standarts of drying in fluidized bed, rice beans IRGA 418 with harvest moisture were tested in an experimental dryer on three conditions of fluidized bed and one on fixed bed drying. The fluidized bed drying were composed of four cyles of fluidization with seven minutes each, with intervals of tempering, removing from the rice beans the moisture between 21 to 26% and happening on the following situations: I) incipient fluidized drying with intermittent ratio of 1:3; II) drying in fast fluidized bed with intermittent ratio of 1:3 and 1:5, all operating with forced air heated at 42±3oC and variables velocitys. Were evaluate and compared the conditions of fluidized of the rice beans and the operational and energetical performance on both static and fluidized dryings. The results of this project are: 1) the rice bean with the harvest moisture is fluidized at standart D on the GELDART classification; 2) The rice can be dryied at fluidized form being more effective the incipient fluidization drying due to the removal of moisture and the thermal efficiency, when compared with the static and fast fluidizations drying; 3) The drying is more effective on the first stages of fluidization when the moisture content is higher at the beans.