Abstract
The material being fed to the pneumatic conveying systems with rotary valve presents some operational problems due to the pressure gradient between the pipeline and the storage silo of the material. A usual alternative to minimize this kind of problem is to operate the pneumatic conveying system with closed silo, mainly when it is desired to feed low density material such as biomass. A great part of literature reports that the rotary valve speed is the most relevant variable in the evaluation of filling efficiency of the feeding device. However, after evaluating the proposed feeding system, it is observed that the air velocity in the pipeline also considerably affects the materials' feeding rate, notably if the material to be conveyed has lower density. Considering the aspects highlighted previously, a 3k factorial design was performed to evaluate the influence of average air velocity and the rotation speed of valve in the feeding efficiency of two classes of polydisperse particles (powders and grains). The experimental results have allowed for obtaining a non-linear empirical correlation for each class of particle, capable of predicting the efficiency of the pneumatic conveying system's feeding rate. The correlations found in this study have presented coefficient of determination around 88.7% and 90.2% for powders and grains, respectively.
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