Estudo do comportamento dos componentes de um leito fluidizado circulante em função da aeração aplicada na válvula de recirculação dos sólidos

Abstract

The application of Circulating Fluidized Bed (CFB) is essential due to its characteristics, which bring notable benefits in various industrial areas. Its ability to efficiently transfer heat and mass, as well as low pollutant emissions, are important advantages. This technology provides significant improvements in industrial processes. It is crucial to understand and analyze the fluid-dynamic phenomena present in these systems, as it can contribute to the enhancement of existing processes and the innovation of new applications. The collection of experimental data becomes an essential tool in this context, as it allows obtaining fundamental information about the behavior of the components of a fluidized bed. The focus was then on conducting experimental tests for subsequent analysis of the behavior of the components of a CFB on a laboratory scale, operating with a tangential cyclone gas-solid separator and aeration only in the supply chamber of a loop-seal valve, with variations in the aeration flow rate and changes in the solid inventory. To ensure the reliability of the results, the experiments were conducted in duplicate, all under controlled conditions with fixed parameters such as fluidization velocity and average particle diameter. Based on the experimental data obtained, an analysis was performed on the behavior of axial pressure profiles, pressure drop values, solid recirculation flow, and cyclone collection efficiency. The variation in aeration flow rate in the range of 2.05 m³/h to 5.40 m³/h proved to have a greater impact on the calculated values of cyclone collection efficiency. On the other hand, the variation in the inventory, from 3 kg to 5 kg, was evident in the analysis of pressure profiles and pressure drops in the components, with special attention to components with higher solid concentration, such as the stanpipe and riser.