Contribuição à análise do transporte pneumático em fase diluída

Abstract

This thesis is a contribution to the dilute-phase pneumatic conveying analysis. The survey of the key parameters of a pneumatic transport of bulk solids which are: the minimum conveying air velocity and pressure drop in horizontal and vertical pipelines. Therefore, an analysis of the main correlations available in the literature is made focused on the prediction of such critical velocities, and so proposes the use the most reliable correlations. In this way, an equation to predict the pickup velocity of the particles at the bottom of a horizontal pipeline was also developed. Then was analyzed the behavior of the pressure drop due to the solids and system properties using two computer programs, one of them does not consider the pressure drop in the acceleration zone in its formulation (algorithm). So, it is possible to understand what is the contribution of the acceleration zone in the total pressure drop of system and which is the range of application of each program. It is also done through mathematical modeling, the sensitivity analysis of the initial porosity of the bulk solids in the pressure drop along the pipeline as a function of parameters such as: solids mass flowrate, pipeline length, particles density and pipeline diameter.